Results of the first five data years of extreme stress scratch gauge data collected aboard Sea Land's SL-7's

(1)

RESULTS OF THE FIRST FIVE

"DATA YEARS" OF EXTREME

STRESS SCRATCH GAUGE DATA

COLLECTED ABOARD

SEA-LAND'S SL-7's

This document has been approved for public release and sale; its

distribution is unlimited.

SHIP STRUCTURE COMMITTEE

1979

Lab.

v.

Scheepsbouwkunae

Technische Hogeschool

Deift

4 DEC. 1979

ARCHIEF

SSC-286

(SL-7-25)

(2)

Memb Ag:

United Stai Côcst Guard Naval Sea Systems Corizrnarzd Mi1ary Sealift Command

Mañtirne Adrnü2&ztztion

United Stat Geologicn! Survey

Amencan Bureau of Sbipping

Ship

C

Structure

Committee

An Interagency Advisory Committee

Dedicated to Improving the Sth.icture of Ships

Addrem Cozpondenoe to: Secz'etary Ship Stivcture Committee

U.S. CocEt Guard Headqvorteis, (GM/82) Wchington, D.C.. 20590

SR-124 5 JUNE 1979

This report is one. of a group of Ship Structure _Committee

Reports which describes the SL-7 Instrumentation Program. This program, a jointly funded undertaking of Sea-Land Service, Inc., the American Bureau of Shipping and the Ship Structure Committee, _{represents an} excellent example of cooperation between private industry, regulatory authority and government. The goal of the program is to advance under-standing of the performance of ships' hull structures and the effective-ness of the analytical and experimental methods used in their design. While

the

_{experiments and analyses of the program are keyed to the SL-7} Containership arid a considerable body of the data developed relates specifically to that ship, the conclusions of the program will be completely general, and thus applicable to any surface ship structure.

The program includes measurement of hull stresses, accelerations and environmental and operating data on the S.S. Sea-Land McLean,

development and installation of a microwave radar wavemeter for

measuring the seaway encountered by the vessel, a wave tank model study and a theoretical hydrodynamic analysis which relate to the wave induced loads, a structural model study and a finite element structural analysis which relate to the structural response, and installation of long term stress recorders on each of the eight vessels of the class. In addition, work is underway to develop the initial correlations of the results of the several program elements.

Results of each of the program elements are being made available through.. the National Technical Information Service, each identified by an. SL-7 number and an A])-. number. A list of all SL-7 reports available to date is. .lricluded in the back of this report.

This report documents the installation of the long-term stress recorders and the method involved in selecting and converting the raw

stress data to histograms. The reduction of a five-year collection of these data are presented.

CHenH

Bell

Rear Admiral, U. S. Coast Guard Chairman, Ship Structure Committee

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7.anical Report Documentation Page

1. Report Na.

-SSC-.286 (SL-7-.25.)

2. Government Accession N. - - - 3. Recp.ents CataLo No:

4 T tie and Sjbt tIe

RESULTS OF THE FIRST FIVE "DATA YEARS" OF EXTREME STRES-S SCRATCH GAUGE DATA COLLECTED ABOARD SEA-LAND's SL-7'S

$ Report Date

Marchi.979

6 P0f m ng Organ cot en Cede

8 Perfo mung Organ sotuen Repo 'No

TR-2312-37

. -.

7. Author's). - - .

R. A. Fain and E. 1. Booth -9. Performing Orgonizatieh Name and Address

TELEDYNE ENGINEERING SERViCES 303 Bear Hill Road

Waltham, Mass. 02154 .

10. WorkUnit No. (TRAIS)

.

11. ContractrGrontNo.

DOT-CG-617]2-A

13. Iype of Report ord Period Covered. FINAL REPORT

1972 - 1978

12. Sponsoring Agency Name and Address .

U.S. Coast Guard . .

Office of Research and Development .

WashingtOn., D. C. 20590

14; Spousoring Agency Code

GDSA-1

15. Supplrnentory Notes

16; Abstract

Thi.s report covers the installation of Extreme Stress Gauges mounted on each Of SEA-LAND's SL-7's. Data collected, from each ship over a five-year period is presented in histogram

form. . . .

-17. Ke;'Words

Extreme Stress Scratch Gau eg :

18. Djst;ibutron Statement

Document is available to.the U.S. Public through the National Technical Informatior Service, Springfield, Virginia 22161

-19. Security Iossif. (of this report) '.

Unclassified

20. Security CIossif. (àf this page) Unclassified

21. P4o.-ef Pagee

42

22. Price

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SSC-286 (SL-7-25)

FINAL REPORT

BibIotheek van de

Afdeling Scheepsbovw- en Scheepvaartkuude

Technische Hoqeschoo!, DeIt

DOCUMENTATIE :

k6-

2& /2

on DATUMI 0 't JUNI i60

Project SR-1245

"Reduction of SL-7 Scratch-Gauge Data"

RESULTS OF THE FIRST FIVE "DATA YEARS" OF EXTREME STRESS SCRATCH-GAUGE DATA

COLLECTED ABOARD SEA-LAND'S SL-7'S

by

R. A. Fain and

E. 1. Booth

TELEDYNE ENGINEERING SERVICES under

Department of Transportation United States Coast Guard Contract No. DOT-CG-61712-A

This docwnent has been approved for public release and sale; its distribution is unlimited.

U. S. Coast Guard Headquarters Washington, D.C.

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SHIP STRUCTURE CO?1IrrEE

The SHIP STRUCTURE CONITFEE is constituted to prosecute a research

program to improve the hull structures of ships and other marine structures

by an extension of Iciowledge pertaining to design, materials and methods of

construction.

P.ADM H.

(. Bell

(Chairman)

Chief, Office of Merchant Marine Safety

U. S. Coast Guard Headquarters Mr. P. N. Palermo

Assistant for Structures

Naval Ship Engineering Center Naval Sea Systems Coand

Mr. W. N. Hannan

Vice President

American Bureau of Shipping

u. S. COAST GUARD

Cdt. .7. C. Card Lcdr S. H. Davis Capt C. B. Glass Dr. W. C. Dietz

NAVAL SEA SYSTEMS CO2AND Mr. P. Chiu

Mr. P. Johnson Mr. G. Sorkin

Mr. .7. B. O'Brien (Contracts Admin.)

MARITI} ADMINISTRATION

Mr. F. .7. Dashnaw

Mr. N. 0. Haer

Mr. F. Seibold

Mr. H. Toa

NATIONAL ACADEMY OF SCIENCES

SHIP RESEARCH COITTEE

Mr. 0. H. Oakley - Liaison

Mr. P. W. Rtke - Liaison

SOCIETY OF NAVAL ARCHITECTS &

MARINE ENGINEERS

Mr. A. P. Stavovy - Liaison

'..'ELDING RESEARCH COUNCIL

Mr. K. H. Kooprnan - Liaison

LCDR T. H. Robinson, U. S. Coast Guard (Secretary) SHIP STRT.ICTURZ SUBCO*!ITEE

The SHIP STRUCTURE SUBCO*1ITLEE acts for the Ship Structure

Cosraittee on technical matters by providing technical coordination for the

determination of goals and objectives of the program, and by evaluating and

interpreting the results in terms of structural design, construction and

operation.

iii

Mr. N. Pitkin

Assistant Administrator for

Connercial Development

Maritime Administration Mr. P. B. Krahl

Chief, Branch of Marine Oil and

Gas Operations

U. S. Geological Survey Mr. C. 3. Whitestone Chief Engineer

Military Sealift Command

MILITARY SEALIFT CO1AND

Mr. T. W. Chapman

Mr. A. B. Stavovy Mr. D. Stein

Mr. 3. Terresen

ARICAN BUR.EATJ OF SHIPPING

Dr. H. Y. Jan

Mr. D. Liu

Mr. I. L. Stern

Mr. S. C. Stiansen (Chairman) U. S. GEOLOGICAL SURVEY

Mr..R. Giangerelli

Mr. J.Cregory

INTERNATIONAL SHIP STRUCTURES CONGRESS

Prof. 3. H. Evans - Liaison

AMERICAN IRON & STEEL INSTITUTE

Mr. R. H. Sterne - Liaison

STATE UNIV OF NEW YORK MARITL COLLEGE

Dr. W. R. Porter - Liaison

U. S. COAST GUARD ACADEMY

Capt V. C. Nolan - Liaison

U. S. NAVAL ACADEMY

Dr. P. Pattacharyya - Liaison

U. S. )RCHANT MARINE ACADEMY Dr.. Chin-Pea K in - Liaison

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Approcimate Conversions to Metric Measures

Symbol When You Know Malliply by To Find Symbol

LENGTH

MASS (weight)

0? OuuulCOS 28 ijraiuus g

lIt moutirds 0.45 kiloq.an.s

short tints 0.9 lthl,u,,s 12000 IbI

VOLUME

Isp ti,.isfiriieis S riiillililiss

li..p t.ihliispooiis 55 rrtullitihirs

Ito, 11usd morces 30 esillilitols nil

cups 0.24 litets

ph piirls 0.47 liters

Cl quarts 0.95 hileis

gal gallons 3.8 liters

cubic feel 0.03 cubic n,eterS m3

y'f3 _{crib,c yards} _0.76 _{cubic meters} _in3

TEMPERATURE (exact)

FahrenheIt 5/9 loIter Celsius

teurilmeuluure oabl,ucling lenqietatare

321

.1 ...ilvi.I, ri.ilwi e..i, ii,u,s.qm..,,u,. 0,51 snap ikla,i.d mmii,.... S,. tills Mi, Ps,l,i. 71*1.

iJ,.,l* ui Oi,,.5l,?.. .i.*i ;it..noae... Pt,ce 52.25. 0 Cat.iluit No. Cl 3.10:205.

METRIC CONVERSION FACTORS

square i.Onlioietcbs square meters square kilinietlr,rs hectures (10.000 m71 rr,n an in m kin AREA

Approximate Conversions from Menic Measures

Symbol When You know Muhlipty by In Find Symbol

0.16 1.7 0.4 2.5 MASS (weight) grams 0.035 omiiici's or kulnipoms 2.7 liisiisuls lb tomes (1000 kg) 1.1 sl,,irt lees

Sqii.iim! iuil,.s sil,i.iii. Mimhs nq,i.iii,ll,i act..' in' yd2 in3 m3 TEMPERATURE (exact)

Celsius 9,5 liken Fahrenheit tcnlpnfatnve add 321 teequeruharn

32 996 212

-40 0 40 90 120 160 200

lull .(u

.af .

i.,i L.

-40 -20 0 20 140 60 90 100 37 uC VOLUME niitltlitu,,s liters (l.UJ 2.1 llii,,I iC,iii.. Imilils iii,, lii

liters 1.06 qii.irl1 ill

liters 0.26 gll,ois il.il

cubic melnro 35 ci,bir hot It' Cubic meters 1.3 ci,t,uc yards yd3

LENGTH

uirihliinelers 0.04 mfli:lmcs in

ceulitihiers 0.4 indies in

ranters 3.3 feel It finmaro 1.1 .rril5 yd

kilio,rele,s 0.6 elItes flu

AREA

Cifl2

in' square inches 6.5 541mb cenlinlete.s cm2 012

112 square heel 0.09 squirute meters ft7 kmiu7

yd' square yards 0.9 sq chiefs rim7 _ha

ulI, square miles

scion 2.6 0.4 square k,linuueiu,is linit.uui!., km2 ha in inches 2.5 Ceiitifl,elo.s II feel 30 cenhinmlms cm yd yards 0.9 meters in

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V

TABLE OF CONTENTS

PAGE

I BACKGROUND 1

II FUNCTIONAL DESCRIPTION 1

III VESSEL DEPLOYMENT AND EQUIPMENT HISTORY 6

IV DATA PRESENTATION AND INTERPRETATION 8

V DISCUSSION 12

VI SUMMARY AND ACKNOWLEDGEMENT 12

LIST OF FIGURES

FIGURE I N.C.R.E.-MAXIMUM READING STRAIN GAUGE RECORDER 2

2 GAUGE ACTION 3

3 SAMPLE DATA TAPE 4

4 ILLUSTRATED EXAMPLE OF COMPARISON OF ANOLOG SIGNAL WITH 5

THE SCRATCH GAUGE

5-68 SCRATCH GAUGE DATA 13-28

A-4 SHIP GAUGE LOCATION 31

A-2 COMPONENT LAYOUT 31

II

A-3 SCRATCH GAUGE ENCLOSURE 31

II

B-i - STRAIN-GAUGE DATA 32-42

B-li

LIST OF TABLES

TABLE I SLOPES OF CALIBRATION CURVES 10

IL

II DATA MULTIPLICATION SCALE FACTORS 10

B-i - STRAIN-GAUGE RECORDER CALIBRATION DATA _32-42

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BACKGROUND

This five-year data collection program has been conducted in two phases. The first three years of the program were conducted under the Department of the Navy, Contract N00024-73-C-5140, Serial No. SF35422306 Task 2022, SR 215. The last two years have been under the Coast Guard Contract DOT-CG-61712A.

Nine N.C.R.E. strain-gauge recorders were installed on the eight SL-7 vessels on SEA-LAND service and operated while the vessels saw service on both Atlantic and Pacific routings.

FUNCTIONAL DESCRIPTION

The purpose of this program has been, and is, to obtain as much midships bending stress data from the SL-7's in the simplest most direct manner pos-sible. To meet this requirement, N.C.R.E. (Naval Construction Research Establishment ) - maximum reading strain gauge recorders and clock units (see Figures 1 and 2) were obtained from Elcomatic Limited of Glasgow,

Scotland. The units were installed at approximately midships in the starboard tunnels (see Appendix A for installation details) of all eight SL-7's and

data collecti

began.

Basically, the N.C.R.E. gauge consists of gauge points 10 inches apart and a mechanical linkage which provides a magnification of approximately 100:1 at the stylus. The stylus moves against a pressure-sensitive record-ing paper causrecord-ing a positive and negative deflection (Figure 3). The paper is indexed about 0.1 inch every four hours. Once every sixth interval i.e. every 24 hours, the index is 0.4 inches wide. Each vertical marking has a length which represents the maximum peak to maximum trough stress which has occurred during the four-hour sampling period.

In data interpretation,it is' important to remember the following char-acteristics of this system:

The record indicates the combined wave-induced and first-(or higher) mode vibratory stresses; there is no way to separate the various effects.

The maximum peak, and maximum trough stresses indicated on the record may not have occurred as part of the same cycle i.e. they may have occurred at different times during the four-hour record interval (Figure 4).

Slow "static" changes in the average stress caused by thermal effects, ballast changes, etc., will contribute to the total length of the scratched line.

Prior to installation,each recorder was calibrated on a Bridgeport Miller using a moveable table and a fixed collet to generate strain. The table was moved in increments of 0.001 inches using a dial indicator to measure the motion in both tension and compression. A calibration table and plot for each recorder is provided in Appendix B of this document.

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NaCRE.

-maximum reading

STRAIN GALG

RECORDE23

The analysis of wave-induced stresses imposed on the steel hull of a surface vessel

involves the use of data relating to maximum bending moments applied to the hull

girder. In the course of such analysis, scientific staff of the Naval Construction Research

Establishment, Dunfermline, Scotland, adopted a method of recording maximum strain

variations during specified time intervals by means of a maximum-reading strain gauge

incorporating a strip chart.

Prototype quantities of the NCRE designed recorder were produced within the

Establishment, subsequently evaluated and used as highly successful data acquisition

instruments in the arduous environments experienced by Royal Navy warships at sea.

To meet a demand for further models, it was decided by NCRE to permit a strain

instrumentation company to manufacture the device commercially. Elcomatic Limited

of Glasgow was chosen, and the NCRE recorder now is available as a standard

Elcomatic product.

FIGURE

1

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-2-Gauge Action:

As shown in the sectional diagram below, the

lever system is actuated

by distortion of the structu'ie under test and requires no external power

supply. The instrument is bolted in position, bearing

against the test surface

on two sets of hardened conical

studs. Any change in separation of bearing

points is magnified by the lever system which drives the recording pen

across the stationary reel

of carbon-backed paper. Time related maximum

strain records are obtained by forward movement of recording paper

programmed bya precision battery-rewound clock

and powered by a small

motor also battery powered.

Reel ofrecordingpaper

Deils:

Prime function Duration of Continuous unattended operation MagnificationFactor Resolution Recording pen Crossed spring

Fully automatic recording

of maximum strain.

Three months depending on programme.

Nominally 1 00subjeci to precise calibration by a dial gauge reading to

0.0001".

A strain change of 0.001 will produce a 1 pen

deflection.

Effective base length = 10"

-3-Linearity Temperature effects Vibration Chart loading

FIGURE 2

Test structure Crossed spring -pivot

Substantially linear over strain range of 0.0025.

Uniform temperature changes of gauge and steel test structure pro-duce no discernible pen

movement.

Tested by dynamic strains

of double amplitude

0.0008 at frequencies 25 to 200 cycles per minute no significant inaccuracy.

Cassette.

Pair of COnical

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5E?LA

M'LEA'J

Po'r

'-f..t1.,,-tTn

SAMPLE DATA TAPE

FIGURE

₃

I;

"1'

I ',1rtt1Trryyr!1u1'I it!

tiI'JI(

I ''

I:.

1,rTI' I I r,rrrt. I 0 I1?

:l :

.

[I

. ijJ Ii CTI?i't1TT. !'. I it.! liii

IIII,,H1fIH,IIIIIHHII

1I::t_.'' ..; ... 0 LuowpteJ - .

-1LL

I

LLir4

_.L

I

jJI

-H

I 1 I I

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ILLUSTRATED EXAMPLE OF THE COMPARISON

OFAN ANOLOG SIGNAL WITH

THE SCRATCH GAGE

FIGURE 4

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III. _{VESSEL DEPLOYMENT AND EQUIPMENT HISTORY}

The following section is a brief summary of each vessel 's routing assignment from the time the scratch gauge(s) _{were installed to the} present, along with coninents concerning the operation of the equipment. The sequence isin the order in which the equipment was installed and

placed in service.

The eight SL-Ps have historically been assigned either to Atlantic or Pacific routings. _{Atlantic crossings usually involve some or all of}

the following ports:, Port Newark, N. J., USA; _{Portsmouth, Virginia USA;} Bremerhaven, Germany, Rotterdam, The Netherlands and A.lgeciras, Spain.

Those vessels assigned to Pacific duty visit the ports of Seattle, Washington, USA; Long Beach, California USA; Oakland, California USA; Yokohma, Japan,; Kobe, Japan and Hong Kong (British).

SEA-LAND McLEAN

This vessel is unique for not only were two scratch gauges in-stalled (Serial No. BS72EOO1 in the port tunnel* and Serial No. 026 in the starboard tunnel) on October 7, 1972, but Teledyne engineers rode this vessel during the winters of 1972-1975 and serviced the instrUments. The McLEAN spent her initial, years inAtlantic service. _{In May of 1975, she} dry-docked at Newport News, Virginia and then proceeded to the Pacific where she has been. in operation ever since. . .

Both instruments have performed well and other than replacing a

defective clock unit in May 'of 1978, performance has been excellent. SEA-LAND GALLOWAY .

The GALLOWAY had gauge unit Serial No. BS 73A 007 installed in her stathoard tunnel on March 10, 1973. A problem of unexpected condensation was found arid solved by placing a plexiglass enclosure around each gauge con-taining a 40-watt lamp as a heat source Both the GALLOWAY and the McLEAN were retrofitted with this arrangement and it was provided for all

sub-sequent vessels. The GALLOWAY began her service with Atlantic duty and then. transferred tb the Pacific in September of 1973. She remained on Pacific routings until she dry docked in Victoria, B C , in December of 1975 She then returned to Atlantic duty where she is still presently operating.

The output of data from the GALLOWAY have been low for several reasons. _{The various problems encountered included such things as broken} wires, improper stylus pressure, defective clock but mainly from plain old

lack of attention by on-board personnel during the early years.

*

order to ascertain if the calibratiOn curve for an installed unit had shifted with time, the McLEAN port tunnel gauge, Serial No. BS 72E 001 was removed on October 18, 1975 and. replaced with the spare unit. Serial

No. BS 73E 001. ' The removed unit was returned tO TES and recalibrated. See Appendix B for the results of this test.

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-6-SEA-LAND COMMERCE

Scratch gauge Serial No BS 73A 002 was installed in the starboard tunnel on May 8, 1973 in Elizabeth, New Jersey just prior to the vessel trans-ferring to Pacific duty. The COMMERCE has been in Pacific service ever since.

Early problems were encountered associated with a defective drive. assembly which.had to be replaced. Operation was good until May of 1976 when the clock failed and a new uni.t was installed. In May o.f 1978 a broken switch in the recorder had to be replaced Since that time operation has been

normal. - . . . .:.

4.. SEA-LAND EXCHANGE . .

The installation of gauge Serial No BS 73A 004 in the starboard tunnel was performed on May 13, 1973 at Elizabeth, New.Jersey.. This ship stayed in Atlantic service until November of 1.973 at which time she was transferred to t.he Pacific where she has remained ever since. Scratch gauge operation has been good with the exception of clock troublesin-1975. The chief aboard the vessel has been exceptiona.l and most of the credit for the good quality of th.e data can be attributed to his efforts.. . ..

SEA-LAND TRADE.

Scratch gaugeSerial,No. BS 73A008..,was installed in the starboard tunnel on May 22, 1973 at Elizabeth, New Jersey.. This vessel aiso was trans-ferred to Pacific service at this time and has remained there ever since. This particular system has performed well until May of 1976 when the dynamic response fell off. In September of 1977 Unit No.. BS 73A 008 wasrernoved and Serial No. BS 72E 001 (the 'original McLEAN port gauge) installed. The quality of the data returned to normal ard have been excellent ever,,since.

SEA-LAND FINANCE .

Scratch gauge, Seria1.No. BS 73A 005,wás insal1ed in, the starboard tunnel of the.FINANCE in Elizabeth, New Jersey on October 3, 1973 just before the vessel sailed for her Pacific assignment She has remained on the Pacific routings since her deployment. Early problems with the system included the rep1acement of a broken mounting .stud. The vessel ha.d operational problems and went into dry dock in Vancouver, B.C. in. July of 1974 and to the Todd. Shipyard in Seattle i.n. October of 1.975.... Her. most .recent,dry...oc.kng. was it3 Victoria,; B.C.. in May of l9,77.DatafromQctober'75 tothe present have been good.

'7. SEA-LAND MARKET

Scratch gauge, Serial No. BS 73A 003,was installed in the starboard tunnel of the MARKET in Elizabeth, New Jersey on November 5, 1973. The yes-. sel has remained inAtlantic service' during her operational life. The vessel dry docked at Newport News, Virginia' in November of 1974, March 1975 and again

in October of 1976. . . . .

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-7-A defective clock had to be replaced early in the program. Only minor :operating difficulties have been encountered ove? the _{years and1 in}

general., the data have been quite good.

8. SEA-LAND RESOURCE

The last system installation was performed aboard the RESOURCE in Elizabeth, New Jerséy,on December 13., 1973,when scratch gauge,Serial

No BS 73A 006 was installed in the starboard tunnel _{The RESOURCE was} originally assigned to Pacific duty but returned to the Atlantic in late 1974. She has remained on the Atlantic run since that time. After early operational probléms,the system ran well until April of l975,when a series of problems developed. _{Stylus pressure became too tight and the tape tore} as it was being pulled under the stylus. No soOner was this problem 'cor-rected thenthe clock unit malfuntioned.. A new clock was installed i.n January .of 1976. _{Operation was normal Until June Of 1977 when the clock.} unit again had to be replaced Data since that time have been good SUMMARY

Once early problems were overcome. most of the systems have performed in the expected manner. Clock units have caused a number of problems and are the weak point in the system. As the program continued, cooperation from the crews has become excellent and the quality and amount of data col-lected have increased proportionally.

IV. DATA PRESENTATION AND INTERPRETATION

'As previously stated,. thedata have been collected on rolls of pres-sure serisitive paper. Each roll represents approximately three months time and usUal1y at least, 2 rolls of tape are c011ected during each six-month visit to the vessel. In order to protect the data and faci.1itate analysis, each. data roll was subsequently mounted on 8 1/2 x il card stock withusually 3 trips Of the roll mounted per sheet. A copy of all data folders has been made and they are kept in a master data book arranged by vessel.

The length of each data marking has been measured to the nearest 0.02 inches and the results tabulated for each vessel over the five data years of information collected. It is this tabulatiOn data which supplies the basis for the histograms which are presented in the following pages. In

order to present the data in a more useful form, i e psi of midships bend-ing stress vs. number of occurrences, if was necessary to perform the fol-lowing transformation:

Since the scratch gauge is substantially linear, its calibration curve. is approximately by a straight line and this bythe equation

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where

y = pointer (stylus) df1ection in inches X = elongation in 10 inches

B slope intercept "

-M = slope of thecalibration curve around the-point of interest

If. we assume the scratch gauge operates around the zero-point; i.e. 'there, is no constant stress and any offset due to loading is ignored, "Ba

the slope intercept is zero.

--Solving for X:

-Y-

-M

Stress (psi) = (E, Young's Modulus for.Steel) (Elongation in 1 inch)

(30 x io) x 10-1)

and = (3 x io6

or

= (3 x 106). (length of scratch line'in inches)

apsi _{(slope of the best straight line approximation)}

The lengths of the scratch lines have been:tabulated. The slopeof

the calibration curve for each vessel has been derived from the calibra-tion plots of Appendix B and are tabulated on Table I Since the majority of the data points lie between a gauge defledtion of +0.4 inches to -0.4 inches,the slopeof 'the line, was calculated between these two values. We,. therefore, have reached the point where the stress value for each data

in-terval can be calculated from: ' ' ..

= (length of scratch line in.inches) x (scale factor)

The multiplilcation scale factors.havebeen'calcuiáted for each gauge and are presented on Table II

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-9-TABLE I

SLOPES OF CALIBRATION CURVES

TABLE II

DATA MULTIPLICATION SCALE FACTORS

Calibration Slope

Scratch Gauge Curve Page Value _{SCRATCH GAUGE} SCALE FACTOR

(Fig.)

McLEAN PORT. McLEAN PORT

Original B-i 8-2 87 _Original 3.448 x

Recalibratton B-2 B-4 88 _{Spare (Replacement)} _{3.125 x104}

Spare (Replacement) B-3 B-6 96 McLEAN STBD 3.191 x McLEAN STBD B-4 B-8 94 _GALLOWAY _{3.297 x} GALLOWAY B-5 8-10 91 _COMMERCE _{3.409 x} COMMERCE B-6 8-12 88 _EXCHANGE _{3.297 x} EXCHANGE 8-7 B-14 91 TRADE 3.093 x TRADE B-8 B-16 97 _FINANCE 3.030 x FINANCE B-9 B-18 99 _MARKET 3.659 x MARKET B-b 8-20 82 _RESOURCE _{3.488 x} RESOURCE B-li B-22 86

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Thus, all the information to prepare histograms of stress levels versus the number of occurrences has been developed

The: histograms are arranged intheorder of dta years. One histogram Is provided for each. gauge for each year. (In-data year five, 2 histograms are provided for the SEA-LAND TRADE as two gauges of different calibration factors were used )

Associated with each year 3 additional plots are included. A summary plot of all Atlantic data, a summary plot of all Pacific data, and a final plot of all data collected within the year Finally, three summary total

histograms are included A five-year Atlantic summary, a five-year Pacific sum-mary, and a summary of all data collected during the five-year period Thus, a total\of 63 histograms are presented (Figures. 5 through 68, inclusive).:

To facilitate data presentation, the data he been divided into "Data Years" as follows:

Data. Year (1) :' .

-September, 1972. to May 1, 1974-.

:The, firt year has been broadened to include the early contractual period which started in September of 1972 rather than starting 4ith Mayl, 1973, primarily because only the McLEAN and GALLOWAY had their installations in operation priorto the May 1, .1973 date,.

Data Year (2) May 1, 1974- May 1,. 1975. Data Year (3) May 1, :97.5 - May 1, 1976 Data Year (4) May 1, 1976 - May 1, 1977 DataYear (5) May 1, 1977- May 1, l978

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DISCUSSION '.

Over 36,000 measurable readings of midships bending stress have been tabulated and presented in the foUing sectia-i. The scratch gauge re-coders, normally operating continuously, have also recorded numerous

4-hour intervals where no noticeable change has occurred. _{These intervals)} such as periods alongside docks, operating in calm waters, in yards for repairs., etc., must be considered when evaluating the overall data collec-tion program.

The scratch-gauge recorder captures the stress hitory of the vessel and,,if the individualreading the tapes is observant,he can establish many interesting events. It. is possible .to tell When the vessel is loading, when it is moving along the coast and naturally when it has encountered a storm or high seas. We have recorded stress changes of the various vessels going on and Off dry docks and this information,if properly correlated with the vessel's status at the time i.e., loads and their distribution, could provide useful information on thehull response. _{It's even possible, under} close observation, to tell When the weather is sunny.

Thus, we have only scratched thsurface with the data tabulated in this report. The cautions to be observed when using the data have been amply explained and all the original data. and suninaries developed for this report are available in the SL-7 data library maintained, at the, Waltham, Massa-chusetts facilities of TES..

SUMMARY

This five-year program has been very successful with more and more quality data being obtained each year as the programprogresses. Coopera-tion from the vessels and port personnel on both coasts has been excellent. At this time,all installations are functioning and we anticipate that additional years of data collection will be authorized shortly.

ACKNOWLEDGEMENT

The data presented in this report could not have been col-lected without the interes.t and assistance of the Master and Crew of each SL-7. Particular thanks.is made to the Chief and/or First Engineer of each vessel who have provided the on-board attention these installations have required.' Last, but certainly not least, our appreciation 'to the Sea-Land terminal personnel on both coasts who' have assisted usduring this program..

(20)

-12-1p 300 250 200-W (_)

z

3-,o 250 203 'I) LI 50-Cr '-'02 IC -J I oo c h.Y2 -1I-z66OPSI 20_{lb0 1} iiOu',I4 0 4 2 I l'i- ' I 2

(j 4

,I l.1J1J) 1) 5 l 15 20 25 30 35

M.XIMUM PEAK TO TROUGH STRESS- KPSI FIGURE 7 ?36 :22 (20 I .1:111 ?8

ft--690 PSI

c,,i

a

₂₅

LI6

L

1802

0L,

LL

943I4

j,1

'hfo'3

14

0 5 10 1 20 25 30

MAXIMUM PEAK TO TROUGH STRESS-KPSI FIC'URE 5

McLEAN-PORT DATA YEAR 1

ATLANJT IC

SCRATCH GALK3E B572E001

131i1

'I

-'P r1}1

GALLOWAY- STBD

DATA YEAR I

ATLANTIC- PACIFIC

SCRATCH GAUGE BS73ACX)7

35 40

776 OC' UR1E NCES

40 McLEAN -STBD DATA YEAR 1 ATLANTIC SCRATCH GAUGE 026 -. 1-638PSI OCCURRENCE1466 '5ui IOU I0 _.1 . 2 I2,I6 212.3 3 I 3 'I ii 3 5 10 IS 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESS-KPSI FIGUHE 6 40 COMMERCE - STBD DATA YEAR I PACt FtC SCRATCH GAUGE 5S734002 I5') -3

a

I-642PSI

295

ii

OCCURRENCES 50 ,

II32

I ' 0 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESS-KPSI

FIGURE 8 33 250 20.') Lii I-) tul 50 (C Cr 103

0

2 50 250 2 DO

(21)

2 150 100

95

0

_z5O 300 _3O 250 EXCHANGE- STBD DATA YEAR 1 ATLANTIC-PACIFIC

SCRATCH GAUGE B573A004

239

HH66OPs1 955

OCCUR RE NCES

5 tO 15 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESS-KPSI FIGURE 9

250 FINANCE-STBD

DATA YEAR 1

PACIFIC

I-) z150 L.J 1O 43 11-ø6O6P5I

I Ii

I

168 OCCURRENCES 5 10 15 20 30

MAXIMUM PEAK TO TROUGH STRE55KPi

FIGURE 11

1. 5 20 2 30 3

FIGURE 12 -1h-=32 PSI TRADE- STBD DATA YEAR 1 PACIFIC SCRATCH GAUGE BS738C08 '23 j140 [127 fIO 3?

-*-619PSI

21 24 I2 2

.,I..,,I,.,uIl!,,IU I lIlIulIJYIlIlTI., I

C) 5 tO 15 20 25 30 35 40 MA)(IMUM PEAK TO TROUGH 5TRESS-KPSI

FIGURE 10

MARKET- STBD

DATA YEAR 1

ATLANTIC

1041 OCCURRENCES 338 OCCURRE NCES 25O 200 I,)

I50

100.

0 z

(22)

200 'I.) 44 50 250

3o0

25M 2. 1500 500

ii-I8 5 9 4

'1.96

Ii

_u._ )i2_2 20 25 30 35

MAXIMUM PEAK 10 TROUGH STRESSKPSI

FIGURE 13 413 652 388 449 285 203 I65o -I

I liii

I2& _{40 22} 41 ₂₂ ₁₂

I...-.

1000 PSI RESOURCE STBD DATA YEAR 1 PtICIF IC SCRATCH GAUGE 85734006 SUMMAhY DATA YEAR 1 PAC IFIC 443321211 I 355 OCCURRENCES 3253 OCCURRE NCES 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESS - KPSI

FIGURE 15 1530-720 Ct 55. lOOO 430 336 -.

1I--1000PSI

2 0 0 3OO 2500 2000 II 1500 w w 1000

0500

2 0 0 5 10 15 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESS XPSI

FIGURE 16 3950 OCCURRENCES I 152

iY4026

'2 6 4 3 5, 43 [a 112 IS 9 I I I I I '1 rI ry , _r"

.i

5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESS KPSI

FIGURE 14 950 1312 941 819 621 516 .3,9 310 259 -. '96 -134 -139 75 -1 H000 PSI 66 SUMMARYTOTAL DATA YEAR 1 7203 OCCURRE NCES .30 i 43 16 _i

_iI6523

II

I

rn

2ScX)- SUMMARY DATA YEAR 1 AT LA N T IC 2000

(23)

8100

d

₂ 50-200 U) 1179 OCCURRENCES V

¶-690P5l

FIGURE 17 250 173 94 70 49, - 143

iI_66O PSI

44 33 1,3,11 GALLOWAY-STBD bTA'. YEAR 2 PACIFIC ' V

SCRATCH GAUGE BS73A007

527

OCCURRENCES

10 15 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESS-KP5I

FIGURE 19

d

2 3.00 250

0 z

300 '9' .12W 50 0 r- -o I hL?!6I7I7,,242z. 12 .1 11ii1I1IiLIrJiu . 5 10 15

.20.

FIGURE 18 56 50. 50 22 111114

I

10132,3 21

u,.t

250'

V COMMERCE-STBD 'DATA YEAR 2 PACIFIC

200 _{SCRATCH GAUGE B573A002}

1OO

f}--682 PSI

4

I

2L 30 35

S 10 15 20 25 30 35

FIaJRE 20 222 OCCUR RE NCES U IS 41 4,64 7

IIfl''IPI1I2?,i

I 12 I I,',J!, _Ji 1 r.'

I'

I Ø 5 V 10 IS 20. 25 30

MAXIMUM PEAK TO TROUGH STRESS- KPSI 35 40 300-250- McLEAN-PORT V. DATA YEAR. 2 ATLANTIC 2OO U, w. V

SCRATC H GAUGE .8572E001 L)

z

w150-c.

J162 I32 LrI16 41. 23 II 2 iT -IF- 638 PSI 1099 OCCURRENCES,, McLEAN- STBD DATA YEAh' .2 ATLANTIC SCRATCH GNJGE 026 .

(24)

300 300 I5O 1oo

d

₂ 50, 300 250 4' 0o :I5: Iç9S 100

o

z.

50

Ii

-ff-66O PSI

I 19I I?.

I

'2 11111 EXCHANGE- SIBO DATA YEAR 2 PAC I F IC SCRATCHGAUGE BS73A004 932 OCCURRE NCES. 10 15 .20 2 30 3

MAXIMUM PEAK . TO TROUGH STRESS-KPSI

FIGURE 21 -: FiNANCE- STBD .DATAYEAR 2 PACIF IC SCRATCH'GA&JGE 8S73A005 972 OCCURRENCES 5 10 15 20' 25 30. 35 40

FIGURE 23 25 200

'n.

Li i 13 r.106 100 -. 50 300 25 33 41 6 24

IL

619 PSI 3.

i

F.

"

I _{I I.}

I I " 6i9

I H.

I.IiI

-*-x732 PSI

RADE-STBD DATA YEAR 2 PACIFIC

745

OCCURRENCES

10 I 20 25 30 35

FIGURE 22

2

MARKET- STBD.

DATA YE.AP 2

ATLANTIC

SCRATCA GAUGE 6S73A003

-j

475

OCCURRE NCES

'I'II

5

0

5 20 . 25 3G 35 40

MAXIMUM PEAK TO TROUGH STRESS -.KPSI

FIGURE 24

25

20.

(25)

d

_z

300 250 RESOURCE- STBD DATA YEAR 2 PACIFIC-ATLANTIC 20 SCRATCH GAUGE BS73X6 In w w

a

:3 (-) U

0

PSI I. 30 I" I07E,2,64

I

I I 10 15 20 25 30 35

FIGURE 25 0:, 660 OCCURRENCES 3CO 2500 S.. cnl500 w LI

z

w ci

'I

:3 I-, 500 SUMMARY DATA YEAR 2 PACIF IC 788 948 373 481

I

2O 141 ₃₅₅₇

ft-i000

PSI OCCURRENCES

I k...'o

8$/S208,47639aI 2 --10 15 20 25 30 .35 40

FIGURE 27 20' 2500 468 525 340 349 239 223 0O0 PSI

I'll"

" 144 6I74436 3 2

II..

3 4 I1256 1500 LI 898

z

Ui 82I 10OO 390 I C-, 224 ---100OPSI

III"

386

0

204 5s1 143

d

-

104

I. 8 30

46 6

II

69 a_I 10 15 20 25 30 35

FIGURE 28 '462 SUMMARY DATA YEAR 2 ATLANTIC SUMMARY-TOTAL DATA YEAR 2 3253 OCCURRENCES 2I I I 10 15 20 25 30 35 40

FIGURE 26 6810 OCCURRENCES 3 2 I 31 I I 102 47 6 43

(26)

300 250

0

250

91 II II I 0 5 10 15 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESSKPSI FIGURE 29

Ht660 PSI

GALLOWAYSTBD DATA YEAR 3 PACIFICATLANTIC SCRATCH GAUGE BS73NX)7 216 OCCURRENCES 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRE5SKPSI

FIGURE 31 U lO0

0 ₂

0

2

50 1118_¶13 lie Ji tO

l46

_.Il!4134 _III 1

11r

10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESSKPSI

FIGURE 30 I5 I I 200 Li I 2 Li IrIOG IOO 9

fl.z638 PSI

çij PSI 1086 OCCURRENCES COMMERCE STBD DATA YEAR 3 PACIFIC

SCRATCH GAUGE 8S73A002

652

OCCURRENCES

5 10 15 20 25 30 35

FIGURE 32 300 250 Li I.-) 150 100

0 ₂

50

,2I

IM 110 124 2. 514 Mc LEAN DATA YEAR PAC IFIC SCRATCH

ft--658PSI

PORT 3 GAUGE BS7OO1 8573A001 1205 OCCURRENCES 300 250 200 1220 1190 McLEANSTBD DATA YEAR 3 PAC I FIC SCRATCH GAUGE 026 44 2C

(27)

200 169 LI I us

i150

00 50 1 "9

..,,,.

a 10 15 20 25 30- 35 46

MAXIMUM PEAK TO TROUGH STRESSKPSI FIGURE 33

250 FINANCE STBD

DTAYEAR 3

PACIFIC

SCRATCH GAUGE BS73OC6

32

II---606 PSI

.2,9 27 - ue 16 1025 OCCURRENCES 5 10 15 20 25 30 35

MAXIMUM PEAK TO TROUGH STRESS KPSI FIGURE 35

300

250 TRADESTBD

TA YEAR 3

PACIFIC

200 _{SCRATCH GAUGE B53A008}

0 _z

25 '0 119 70 2 200 U,

"(U

I50 a: 97

-ii- 619.PSI

668 OCCURRENCES' O 5 10 15 20 25' 30 35 40

MAXIMUM PEAI( TO TROUGH STRESSKPSI FIGURE 34 114' MARKETSTBD YEAR '3 ATLANTIC SCR41tH GJJGE BS703 815. OCCURRENCES 10 1 20' 2 30

35,40

MAXIMUM. PEAK TO TROUGH STRESSKPSI FIGURE 36 300- 250-200' 150-!b00. 50-7 136 '09 rtOO 61 DATA YEAR PACIFIC SCRATCH 4

4F-66OPSI'

13' H'T I3' EXCHANGESTBD 3. GAUGE' BS73/OO4 '120.8 OCCURRENCES

(28)

I50 50 7I? II

3Ii

2

ii

I iL1l

_,ttI',

5 10 15 20 25 30 35 40

FIGURE 37

lH69B PSI

SUMMARY DATA YEAR 3 PACI FIC RESO(JRCESTBD DATA YEAR 3 ATLANTIC

327 OCCURRENCES 63Z

J-000psi

226 III 104

I4 2

Ti .

. iv, 111V11, ii1

5 10 15 20 25 30 35 40

MAX MUM PEAK TO TROUGH STRESS - KPSI FIGURE 39 6046 OCCURRENCES 2500 151500 Lu Li

z

LU Crl000 5O0 '97 '9 '93 107 94 131 51 ₂₄ 60

IuI..i..

I -1 I_-boo PSI II 12

₆₁₄₂

7 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESSKP5I

FIGURE 38 SUMMARY DATA YEAR 3 AlL ANT IC 1156 OCCURRENCES SUMMARYTOTAL DATA YEAR 3 '621

H

625 970

III'

284 466 494 1000 PSI 277

ill

128 7 24 24 _{3 4} 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESSKPSI FIGURE 40 7202 OCCURRENCES 250 2D0 250 2cxX Lu

I.

10OO

z

141 e 1508

(29)

300 25O 200 LIJ 63

0 .fl-_625 PSI

z

50 0

Ii

' , 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH 5TRESSKPSI

FIGURE 41 258 e 22

-I I°

PSI McLEAN PORT DATA YEAR 4 PACIF IC

SCRATCH GAUGE BS73AOO1

1137

OCCURRENCES

GALLOWAYSTBO DATA YEAR 4

ATLANTIC

261

OCCURRE NCES

I3 _123, ' _I

tO 15 20 25 30 35 4

FIGURE 43 300 250 200 ISO I-)

z

a: D 1O0

0

50 300 206 25O 2O0

0

50 -lb 97 5 10 15 2. 25 30 35

MAXIMUM PEAK TO TROUGH STRESSKPSI FIGURE 42 leo

-1

PSI

Tj

Mc LEAN STBD DATA YEAR 4 PAC IFIC SCRATCH GAUGE 026

h682

PSI 1001 OCCURRE NCES COMMERCE - 5160 DATA YEAR 4 PACW IC

SCRATCH GAUGE 8S73A002

1366 OCCURRENCES 3

ri'iiLt

_{si 3}

r

i i 5 10 15 20 25 30 35 40

FIGURE 44 3(0 25 200 w 150 810

a

₂

50

Or

0

(30)

30 250 200 U, 50

0 z

50 It 1024 _i (

, I'

I ''i' I

' ' I 0 10 15 20 25 30 35 40 MAXIMUM PEAK TO TROUGH STRESSKPSI

FIGURE 45 300 OO £269 j198 157 Z5B 250 116 91 62 rTI 47 54 Ii 21 2i017

-1 t6°

PSI EXCHANGE-STBD DATA YEAR 4 PAC I FIG SCRATCH GAUGE BS73004 1252 OCCURRE NC ES FINANCE- STBD DATA YEAR 4 PACIFIC

200 tO I'7

Z5

45 r93 -- 55 (TIB

---606 PSI

I 1211 OCCURRENCES "II

°

22

0'

0 5 0 15 20 25 30 35

MAXIMUM PEAK TO TROUGH

STISSKPSI

FIGURE 47 300 25 In 140

0'

72 c 50 267 TRAOE-STBD DATA YEAR 4 PACIFIC

200 I SCRATC H GAUGE BS73A008

-1

.-619 PSI 655

OCCURRENCES

5 10 15 20 25 30 35 40

FIGURE 46

MARKET-5TBD DATA YEAR 4

ATLANTI C

200 SCRATCH GAUGE BSF3LCO3

In w L) 134 15. {

a

8100 ci 4P -1t--732 PSI 888 Z I3() _OCCURRENCES 50 [21 5 I 10 _{1 5 ,} '2 1r0 3 2 I I I U

i.u__

--10 15 20 25 .30 35

MAXIMUM PEAK TO TROUGH STRESS-KPSI FIGURE 48

3)0

(31)

330

250 RESOURCESTBD

DATA YEAR 4 ATLANTIC

200 _{SCRATCH GAU(,E BS73AOcE}

'I

I

32

lL6sB

PSI 27 ) I

Ihi'°''

2 3i

liii..

.__ 5% 58 3'

4i

3

III

SUMMARY DATA YEAR 4 PACIFIC 464 OCCURRE NCES 0 5 10 15 20 25 30 35 40 MAXIMUM PEAK 10 TROUGH STRESSKPSI

FIGURE 49 r.)

6622

OCCURRENCES

5 10 15 20 25 30 35 40

FIGURE 51 In' Li 2500 2000 I-,

z

Lii ₂₉₀

a 1...

230 312 '50

_{fi000 ist}

'20 126

z

_{6r45 0?}

21 25 SUMMARY DATA YEAR 4 ATLANTIC 10 8

61

1613 OCCURRENCES 10 15 20 25 30 35 40

MAXIMUM PEAK 10 TROUGH STRESSKPSI

FIGURE 50 SUMMARY TOTAL DATA YEAR 4 2cXx 1865 '79? Z 690 ci

I

49

l.e.

I

619 500 22 LI

I

H1'b000PSl

d

II

643!.2IIeI 2 A I .1.111.

21

5 10 15 20 25 30 35 40

MAXIMUM F'Et&K 10 TROUGH STRESS KPSI

FIGURE 52

8235

(32)

30 250 '7, 93 -76 r53 42 ..I PSI MCLEAN-PORT DATA YEAR 5 PACIFIC

SCRATCH GAUGE BS73AOOI

608 OCCURRENCES 14

14742

I 4S 12

2'

10 IS 21 25. 30 35

MAXIMUM PEAK TO TROUGH STRESS - KPSI FIGURE 53

HF.660 PSI

572

OCCURRENCES

0 5 10 15 20 25 3b 3b 40

FIGURE 55 -96 ,OO 75 F-72

8

II. 36

d

25

I''' 617

I I [16

IIuii._.i.

. 300 162 I5O II "4 IO0

0

0 d

z 50 07

2212

2111 I

II

-i i.- z2 PSI

MCLEAN-ST BD. DATA YEAR 5 PAC IF IC SCRATCH GAUGE 026 468 OCCURRENCES

-ri-ri I

I I I I 5 0 15 20 25 30 35 40

FIGURE 54

797

OCCURRENCES

0 5 10 5 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESS -KPSI FIGURE 56

250

GALLOWAY- STBD

DATA YEAH 5

ATLANTIC

SCRATCI I GAUGE L73PO07 200

COMMERCE-ST BD

DATA YEAR 5

PACIFIC

r 94 300 250- 200-

I5

0-0

300 250 200

(33)

300

250 - 'EXCHANGE-STBD

DATA YEAR 5'

PACt FIC

20U SCRATCH GAUGE BS73A004

r

HF.-660 PSI

132, I 2?4

Iii '28

8' 24

'i

iiIiuuu

-. I. ._..-..___ I?6 w () 109 Li 19

00. 'I.?

L)

I8

0

ci

z5O

30 250 200 Li -V_z,I50. Li cc o 5 10 15 20 25 30' 35 MAXIMUM PEAK TO TROUGH STRESS-KPSI

FIGURE .57 PSI

Ii36z1

i 111111 ..'g: 889 OCCURRENCES TRADE-STBD DATA YEAR 5. FACIFIC

SCRATCH GAUGE BS72EOOI

(FROM SEPT. 1977.)

649

OCCURRENCES

0 5 10 'IS. 20 25 '. -30 35

MAXIMUM PEAK TO TROUGH SIRESS-KPSI

FIGURE 59 40 300 TRADE -ST8O 250 . . DATA YEAR 5 PACIFIC

SLRAT.H JGE BS73A008

200 (UNTIL SEPT 1977 ) 250 200

-In

_Ui LI z150 Li.

0 z50

300.

F-619 PSI

'174 OCCURRENCES. O 10 15 =20 25 30

MAXIMUM PEAK TO TROUGH

STRESS-KPSI-FIGURE 58 5? -s4 1

j

27.-so .

I l'l '10

IiIIiiiii,

6O6 PSI FINANCE- STBD DATA YEAR -5 FACIFIC

619 OCCURRENCES

0 . 5 10 15 20 25 30 35 40

MAXIMUM PEAK TO TROUGH STRESS -KPSI

(34)

300 300 250 3000 2 5u0

20i

U,

I

_'4' LU 90 U 67 I5O 27 I_ 4I

I

86

z50

I

Ir0

°

II

---732PSI

I 9

II

30 III? l 653 22,1

II,. ...

I...--MARKET - ST BD DATA YEAR 5 ATLANTIC 2 964 OCCURRENCES

05

tO 15 20 25 30 35

FIGURE 61 SUt,'.M/kY DI.1A urAk 5 ATL/I4 TIC If) I5OO

z

Ui r338 I0O0 i r314

8 -j

}l000 PSI

2347

z 50)

[CURFEN]

ci

I I

Iii6 4921 12 9 84 4034 22 36342 I

I Il 1ri 1I

I

I ii

i

i ri-i

0 5 10 15 20 25 30 3 40 MAXIMUM PEAK TO TROUGH STkESS - IFSl

FILUkE 63

250

SCRATCH GAUGE BS73O3

200 200 U, 'Ii ulSO 127

z

Li ₁₀₁ I00 ei 5o

146

3000 2500 2000

I IIHF698

PSI

129

I I?

Ii

95

I Iii,

Ii

J;__44___ ii 10 15 20 25 30 3 40

FIGURE 62 If, Ui 01500 975 874 Ct: a: I000

H 1-1000 PSI

4204

8

es '93 OCCURRENCES 500 54

01111

32

s 04

_'1 RESOURCE -S1BD D4TA YEAH 5 ATLANT IC

SCHATCIl GAUGE 8S73AC06

2 811 0CC URRENCES SUMMARY DATA YEAR 5 FACIFIC 0 5 10 15 20 25 30 35

(35)

2500

2000-tn.

_w I500 LU IX 000 500-12

,I0

0

1263 'lee .11052 - I 35 r36? 285 _41.._i000 Psi. I I8 I

iii

'los If) 14_I 519 ' 2740 3050 1759. 12 7 1(141 I 600

_52l

1000 PSI

I

3j? 110

Ii

hi..1

4E5820l7 SUMMARY- TOTAL: DATA YEAR 5 6561 OCCURRENCES '2

1 IiI

I 5 10 i5 20 25 30 35 4C

FIGURE 65 SUMMARY-PIFIC GRAND TOTAL 5 DATA YEARS

tIll

23692 OCCURRENCES

-1_Il, Ii

0 10 15 20 25 3

3,

4

MAXIMUM PEAK TOTROUGH STRESS

_{- .PSI}

FIGURE 67

0

Lii 1710

z6

1807 W 2040 IX 12115. cx: '063 i83

o4,

6I,

0

C) 266 277 197

-,

73

hlh...

j11

i33

MAXIMUM PEAK TO TROUGH ST:RESS---KPSI

FIGURE 66

0

12

SUMMARY- GRAND, TOTAL

5 DATA YEARS 6949 J7446 4335 2842 2260 1102. -1 H000 PSI 1019 -756 579. -455--39

-

341 184

-

189 42

-

131 10

0

0 o8-w.

6 w cx: a: 4

0

ci z 2-1h-t0oQ PSI SUMMARY - ATLANTIC GRAND TOTAL 5 DATA YEARS 1231-9 OCCURRENCES 36011 OCCURRENCES

33 II

5 10 15 20 25 30 .35 40

MAXIMUM. PEAK TO TROUGH STRESS - KPSI

FIGURE 68

(36)

APPENDIX A

SCRATCH GAUGE INSTALLATION

GENERAL

The installation of a scratch-gauge recording system aboard an .SL-7 involves the mounting and wiring of three major components; the gaUge-itself, the clock assembly and the protective enclosure. With the'ex-ception of the McLEAN, all vessels have single recorder installations

located at approximately Frame 186 in the starboard longitudinal box girder (tunnel). The McLEAN hasinstallations in both the port-and starboard-tunnels. Figure A-i shows the phyical relationship of the recordeloca-tion to the rest of the vessel. The installation is made on the secofld from-the-deck outboard longitudinal girder either at Frame 186 1/4 or 186 3/4 depending upon local interference problems.

PREPARATION

At the instaliatton site,al1 components are physical1y placed in post-tion and clearances checked. To ensure a minimum of effect on the vessel structure,all components are bolted to 1/2 -:20 studs,which are welded to the steel with a stud welding machine. The first task is to mark all stud locations: six for the recorder;* four for the clock assembly and eight for the enclosure assembly.

Once the studlocations are marked each area is cleaned to bare

metal

with a h.ndhe1d grinder and a center punch used to mark the stud center. This ensures that when the stud is welded a good clean weld is achieved.

*Although only 2 studs are required to mount the recorder, three pairs i.e. six studs were installed to provide spares In case of stud failure during the operational life. One such failure has occurred and the quick movement of the recorder to a spare set of studs was accomplished with a minimum of data loss.

(37)

-29-3.. INSTALLATION (Ref. Fig. A-2)

The clock assembly,. the clock, and its mounted plate, is bolted to the studs on the side shell. Next, the recorder is positioned and tightly secured. It is very important that the recorder studs be tight to ensure that the conical bearing points of the instrument are making good contact with the steel shelf.

The connecting cable from the clock to the recorder is then positioned and connected. With batteries in..the clock unit, the hands are, then

physically ttrriedto ensure tte recorder advances at the desired 4-hour increments. When operation is satisfactory, the plexiglas enclosure

(Fig. A-3) is. positioned 'and bolted in place. Clear RTV (Room Temperature Vulcanizing) silicon rubber is then putaround all edges to make a nearly watertight 'seal around he enclosure.

The lamp unit On the enclosure is wired to a local service of 115 V, 60' Hz, Single Phase power to operate the 40-watt lamp in the top.

A final check of the recorder ensures free movement of the stylus arm, and proper marking pressure on the paper tape. The clock is set toGMT and the front door qf th enclosure closed.

We,,have requested that the chief engineer mark the tape with the date at least 'once a week. Each 'roll of tape lasts approximately 3 months at which time both the tape and clock batteries should be 'changed. Spare tape; batteries, and lamp are kept inside each enclosure.

(38)

':30-PcT MC LEAN ONLY HATCH 7 SCR&TCH GAUGE WCATION TBD 1 0 0'

SHIP GAUGE LOCATION FIGURE A-i

FWD

SCRAITCH GAUGE ENCLOSURE

FIGURE 4-3

-31-I4 MAX. 2ND CABLE MTG. PLATE CLO FR 186

SIDE SHELL PLATING

18

GAUGE

_J

-Eç

LONGITUDINAL SHELL GIRDER

COMPONENT LAiOUT FIGURE

4-2

(39)

INDICATOR DEFLECTION

Compression (in) Tension (In)

0.0 0.0 0.002 0.004 0.006 0.008 0.009

STRAIN-GAUGE RECORDER CALIBRATION DATA (Original)

GAUGE SERIAL NO. BS 72E 001 McLEAN STBD TUNNEL FR 186 1/4

TABLE B-1

POINTER DEFLECTION (IN)

0.0 0.176 0.350 0.540 0.688 0.768 0.00 0.172 0.338 0.536 0.692 0.85

NO. BS r2EQO.1

E4.N: PORT.

0.0 0.0 0.002 0.004 0.006 0.008 0.01

(40)

INDICATOR Compression (inch) 0.0 0.002 0.004 0.006 0.008 0.100 TABLE B-2

STRAIN GAUGE RECORDER CALIBRATION DATA

GAUGE SERIAL NO. 85 72E 001

RECAL IBRATION 11/26/75

OF MCLEAN PORT GAUGE

DEFLECTION Tension (Inch) 0.0 0.0 0.002 0.004 0.006 0.008 0.010

0.0 0.15 0.33 0.53 0.72 0.91 0.0 0.2 0.37 0.57 0.76 0.95

(41)

INDICATOR

Compression (In)

STRAIN GAUGE RECORDER CALIBRATION DATA

GAUGE SERIAL NO. BS 73A 001

(SPARE UNIT INSTALLED AS

iIcLEAN PORT 10/18/75)

DEFLECTION POINTER DEFLECTION

Tension (in) _(in!

TABLE B-3

H

-A

.004::.00

rENSIC

GAUGE

McLEANPORT

NO. :B5734OO

:fl$1J: B

2.

:::..::.002::::OO

PESSIOt'

0.0 0.001 0.002 0.003 0.004 0005 0.006 0.007 0.0 0.0 0.001 0.002 0.003 0.004 0.005 0.006 0.0 0.100 0.20 0.28 0.37 0.47 0.55 0.68 0.0 0.10 0.20 0.30 0.38 0.49 0.58

0

(42)

0.0 0.0 0.002 0.004 0.006 0.008 0.0 0.0 0.002 0.004 0.006 0.008 0.01 0.0 0.0 TABLE 8-4

STRAIN GAUGE RECORDER CALIBRATION DATA GAUGE SERIAL NO. 026 MCLEAN STARBOARD TUNNEL FR 186 1/4 INDICATOR DEFLECTION

Compression (In) Tension (in)

0.0 0.170 0.378 0.558 0.716 0.0 0.198 0.388 0.560 0.712 0.874 0.0 4r4

GAUGENO.02

M.cLEN

TARBOARD.:

-.1i--i

-::::_ ....-.

..

---T--- -.

(43)

TABLE B-5

!.IJI! --

S.!A JJ&li

TE

GAUGE

.OZ.

NO

"1

.

:r::mij

ESH

STRAIN GAUGE RECORDER CALIBRATION DATA GAUGE SERIAL NO. BS 73A 007 GALLOWAY

STBD TUNNEL FR186 1/4

INDICATOR DEFLECTION POINTER DEFLECTION (IN)

cr)

LU

I

Compression (In) Tension (in)

()

z

0.0 0.0 0.0 .002 0.2

z

.004 0.38

-0.

.005 0.48 F-.006 0.51

_-J

.005 0.48 U-LU .004 0.39 .003 0.30 L .002 0.16 .001 0.072

z

0.0 0.0 0

0

.001 .12 .002 .16 .003 .28 .004 .33 .005 .45 .006 .53 0.0 0

(44)

TABLE B-6

STRAIN GAUGE RECORDER CALIBRATION DATA GAUGE NO. BS 73A 002 SEA-LAND COI44ERCE SIBD

TUNNEL FR 186 1/4

G&U&E NO.. BE :7O2;::::

U)

w

Compression (In) Tension (In)

0.0 0.2 0.38 0.48 0.51 0.48 0.39 0.30 0.16 0.072 0.0 0.12 0.16 0.28 0.33 0.45 0.53 0.0 0.002 0.004 0.005 0.006 0.005 0.004 0.003 0.002 0.001 0.0 0.001 0.002 0.003 0.004 0.005 0.006

0

I-1-u .__j U-Lu

C

0 u.J

I-0

-

...

.0C4...0C2.

TENSIONI

COMPRESSI

fIGURF

.- -H---- i-

::T

,-e-4--.---4.

(45)

-INDICATOR Compression (In) 0.0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 TABLE 8-7

STRAIN GAUGE RECORDER CALIBRATION

DATA GAUGE SERIAJ NO. BS 73A 004

SEA-LAND EXCHANGE STBD

TUNNEL FR 186 3/4

DEFLECTION

Tension (In)

0.0 0.001 0.002 0.003 0.004 0.005 0.006 0.0 0.08 0.18 0.26 0.36 0.46 0.552 0.64 0.72 0.0 0.1 0.18 0.36 0.44 0.54 0.64

(46)

GAUEE

IRA

NOB73AO4S: H

DEH:STARBORD

INDICATOR

SEA-LAND TRADE STUD

TUNNEL FR 186 3/4

DEFLECTION POINTER DEFLECTION (IN)

[14

compression (In) Tension (In)

0.0 0.0 0.001 0.128 0.002 0.232 0.003 0.252 0.004 0.408 0.005 0.50 0.006 0.60

z

0

0.0 0.0 0.001 0.06 .004.

.X2

0C2

0.002 0.20

TENSION

OMPRESE1ON -thiO-ES.:

0.003 0.28

0.004 0.36

0.005 0.46

0.006 0.56

FIG RER-

...

TABLE 8-8

(47)

TABLE B-9

DATA GAUGE SERIAL NO. BS 73A 005

SEA-LAND FINANCE STBD

TUNNEL FR 186 3/4

INDICATOR DEFLECTION POINTER DEFLECTiON (IN)

f-'-

4-Compression (Ih) Tension (In) C...)

0.0 0.0

-0.001 0.1 I 0.003 0.24 C) 0.004 0.392 -0.005 0.48 Li..

0 w

0.006 0.58

'.0

0.007 0.66 0.0 0.0 0.001 0.12 0.002 0.20 0.003 0.30 0.004 0.40 0.005 0.488 0.006 0.60 0.007 0.66 0.008 0.76 I

fGALJGE::NO.:BS:73OO5

FINNC.E"-St4RBO.ARD

-L

TENSION:

0:

.:.002...00

COMPRESSION

F1GUR: =B-

...

4..

5.:

(48)

0.0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 TABLE B-b

DATA GAUGE SERIAL NO. BS 73A 003

SEA-LAND MARKET STOD

TUNNEL FR 186 1/4

INDICATOR DEFLECTION

Conmresslon (In) Tension (In) 0.0 0.001 0.002 0.003 0.004 0.005 0.006 0.007

0.0 0.1 0.18 0.26 0.34 0.41 0.48 0.58 0.0 0.1 0.17 0.26 0.34 0.42 0.49 0.56 0.64

to

IC

H-GAUGE NO. BS

MAKET-S

:FIGU

7.3Aa3:.

TARBO4HD

COMPRESSION -U N

-1

m

B4

RE

(49)

h4t

2 _-.4

N. C-NaB

RESO RC.E-STARB

Q;4

_.a'z...0

. ..

.COZ'

004

1CNSIcN

COMPFESSION-INCHE

FIGURE

B-S.. z ft z -4 -o :0 z -1 TABLE B-li

STRAIN GAUGE RECORDER CALIBRATION DATA GAUGE NO. BS 73A 006

SEA-LAND RESOURCE 6) STBD TUNNEL FR 186 1/4 0 T1 C-, ft

Compression (In) Tension (In)

(0 -.1 (0 0.000 N) (0 0.001 UI UI 0.002 0.003 0.004 0.33 0.005 0.40 0.006 0.48 0.000 0.00 0.001 0.09 0.002 0.18 0.003 0.28 0.004 0.36 0.005 0.44 0.006 0.54 0.007 0.62 0.008 0.70