ML20100B771
| ML20100B771 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 09/24/1984 |
| From: | Giuffra R, Hannan W AMERICAN BUREAU OF SHIPPING |
| To: | Yang R TRANSAMERICA DELAVAL, INC. |
| References | |
| OL-S-004, OL-S-4, NUDOCS 8503280566 | |
| Download: ML20100B771 (5) | |
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W M.'T6-3 3 May 1984 Tranammerica Delaval DSR-48 Diesel Engine / Generated for Long Island Lighting Company Shoreham Plant Report on Crankshaft Torsional Stresses.
Transamerica Delaval Inc.
Engine & Compressor Division 550 85th Avenue P. O. Box 2161 Oakland, CA 94621 Attention: Mr. Roland T. M. Yang Manater Applied Mechanics.
Gentlemen:
We have your letter of 3 April 1984 submitting copies of the above subject report for cur revisu, and with regard thereto have to advise as follows:
. ;. e note from t,he submitted report thic the torsional vibration stress in the crank-W
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shaft for the first mode 5 order critical speed (422 RPM) was expect'ad to approach C
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cr exceed that permitted by the Rules for the submitted crankshaft meterial.
We further note from the submitted repart that tests were conducted to determine the actual stresses in the crankshaf t and that these tests indicated a substantial mar -
gin of safety against fatigue failure due to torsional vibration.
Based on the submitted test data, and on submitted service experience with similar engines having similar torsional critical speed arrangements, we advise that we would have no objection to the submitted torsional critical speed arrangement for use on diesel generator sets on an ocean going vassal. insofar as our classification require-ments for marine service are concerned.
Three (3) copyies of the subje:t report, stamped to indicate our review. are being re-turned.
very truly yours,
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" A R F-K H. L.
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!!IC2If33 AMERICAN BUREAU DF SRIFFING
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wenn MAY 071984 urn m.
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LILCO. (E. Montgomery) by:,
Accounting Dept. w/ enclosure Robert A. Giuffr(j Legal Dept. (M. Adams)
Principal Surveyor - Machinery Subject Tile 460 Ttht **o st.212 adt
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i REPORT ON CRANhHAFT TOR $l0NAL STRESSES TRANSAMERICA DELAVAL MDDEL DSR-48 Serial No. 74010/12 for 9
LONG ISLAND LIGHTING COMPANY EETIEWED III
- ACCORDANCE m ASj LETTER DATED 3 MAY 384 Roland Yang.
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Oakland CA.
T TABLE OF CONTENTS Introduction Pages I
& II Section'One Torsional Analysis Pages 1 to 17 18 to 21 Section Two Torstograph Tests Section Three Strain Gauge Tests (FaAA) to to Section Four Operating Hours Legged t
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- U ALLOWABLE TORS 10NAL STRESS CALCULATION.
Based on Para. 34.47 of 1984 ABS Rules.
S = ( U + 2U80 )C C
C 18 k
d r
where U = Minir.um Tensile 5trength of Shaft Material 100000 PSI C
is.55 for propeller shafts and crankshafts k
C is size factor.
35 + 0.487 / N =.M 63 d
C is speed ratio factor. 1.3B for 902. to 1057. rated RPM.
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3, ( 1000% + 23180 ) (.55 )(.6463 )( 1 38 )
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=3357 PSI due to single order Total Allowable Stress = 150 of 3357 = 5035 PSI l
ALLOWABLE TORSIONAL STRESS CALCULATION.
Based on Table 34.3 of 1982 ABS Rules.
12S121.13:33
=
= 135 RPM
= 360 RPM L27.5 to 450 472.5 8.'"
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Grade 2. 60000 psi 56B9 psi 3556 psi 2134 psi 3556 psi Grade 4, 10cc00 psi 8217 psi 5136 pst 3082 psi 5136isi 000 Stress limit multiplier = f (
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- I'444k 60000 for adjustment from 60000 psi to 100000 psi material.
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