ML20100P292
| ML20100P292 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 09/17/1984 |
| From: | AMERICAN BUREAU OF SHIPPING |
| To: | |
| References | |
| OL-I-009, OL-I-9, NUDOCS 8412140107 | |
| Download: ML20100P292 (4) | |
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c 34.11.6 Covernor Control
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All engines are to be fitted with governors which ie B
engines from exceeding the rated speed by more than 15%. In addi.
tion to the nonnat governor, each main engine having a maximmn continuous output of 300 hp and over which can be deelutched or which drives a controllable pitch propclier, is to be fitted with a wparate overspeed device so adjusted that the speed cannot eweed the maximum rated speed by more than 2tr%. For generator ets ce 15.21.
N 34.13 Bedplate The bedplate or cranLesse is to be of rigid corutruction, mitight, and provided with a sufficient number of bolts to secure the s.une to the ship's structure. The structural arrangements for supporting and se.
cunng the main engines are to be submitted for appruval. See Section 19 and for welded coratruction see also 30.13.3c and 30.35.10.
D 34.15 Cylinders and Covers, Uners, and Pistons Parts such as cylinders. liners, cylinder covers, and pistons which are subject to high temperatures or pressures are to be made of material suitable for the stresses and temperature to which they are c.tpn>cd.
When the cylinder diarneter is over 230 mm (9 in.), a relief valve, set g
to relieve at not more than 40% in excess of the maximum firing presure is to be fitted on each cylinder of revernble engines and engines using air for starting. For aiuoliary eneines other etiective means for detenmnmg the maximmn cylinder prewure, such as a maximum. pressure indicator, wd! be specially conudered.
- 14.17 Cranlahafts D
34.17.1 Diameter of Pins and Jaumals The diameter of the cranLJialt pins and journals, in nun or in.. is eun to be leu than d as detenmued by the followmq ewgnatnin.
M + (M' + 4T4' d=c
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D Metnc (fonts Inchtrouaul (* nit, 11 = 1.8tirDtl St = 0.13trD*l.
T = 1.02 x 10ll/R T = 63.000lle a D = diameter of cylinder bore, in mm or in.
P = maximum finnq pressure, in kg/cm or psi 3
D L = span between bearings, measured over the web, m nun or in.
If = hp at rated speed SectioN 34l5 internal. combustion Engines D
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1 R = rpm at rated speed e = 1.16 for one-cylinder engines s'
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= 1.13 for twxylinder engines
= 1.10 for three-cylinder engines
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= 1.07 for four-cylinder engines
= 1.04 for five cylinder engines
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= 1.01 for six-cylinder engmes n,10 for engines with more than sis cylinders f = 1.900 for Grade 2 forgmgs
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= 2.140 for Grade 3 forgings
= 2.310 for Crede 4 forgmgs Values of f for other materials are subject to special consideratinn.
Nese 11 e above orpaatsen will usua64y apply to engines where a hearing adpins esth ade of each crank and where single imtnelses occur at equal hdervals It may apply to other empass if M es roodiasd to redect the appropnate bending J*
mumenes, tacreased dimensents eney he rerpiired where tntical. peed arrance-
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menes or serem son 6snerations are not favorable. Where crisiinh4t dienenwons are peepened wheek are less than those sistermmat hv the above equatinn.
mpportmq data,inchadant detailed isteis analyns, are to he subinit-t ted spacini 34.17.1 Maniman Firing Pressure and BHP The Surveyor is to venfv the maaimum firmg pressure P and brake
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horsepower during the full power trial of the engme. When the en-
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gine builder has demonstrated to the Surveyor by means of tests on a pdot engine that the design value nf P is not exceeded within estab-Inhed limits of production tolerances and settings which would affet it. venfication of P will not be required for an engine built on 4 production line. provided the engine delivers its rated power within the established limits.
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34.17.3 Higher Ratings Subsequent adjustments for the purpose of obtaining higher powers or higher maximum presnares will be subject to special consideration.
34.17.4 Seild CrankshaA Wahs "Ilie proportions of the crankshaft webs are to be such that the effee-tive resisting moment of the web in bending is not less than 80% uf
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the resisting moment of the mininium reqmred diameter of pins and jountals in lunding; that is.
uit8 2 0.35d3 to = effective width of web in mm or in.
t = thickness of web in mm or in.
Where the proportions are uh hat pins and journals overlap t may
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la taken to le the mininnun d agonal distance through the web.
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SfCTION 34 6 Internal Combustion Engines 1
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34.17J Built.up Crankshaft Webs For built-up crankshafts t is not to be less than 0.55d and w not less than 1.8 diameters of the holes in the webs. Dese proportioned di.
mensons we based on the use of the same grade of material for both
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- 1 shaft and webs and may require modification in accordance with any difference in the grade of the iriaterials. Proportions that differ from Jc,
- the above will be considered, provided they are equivalent in strength.ne weln are tu be shrunk or forced on the shaft.uid crank.
pin and if doweled or keyed to the shaft. the shaft is tu be increased in dianwter in way of the web to compensate for the keyway.
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34.18 Turbochargers and Superchargers 34.18.1 General Turbochargers and superchargers intended for propulsion engines and for ausiliary engmes of 135 horsepower (hp) and nver are to be of an approved design.
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34.18.2 Pfans and Particulaas to be Submitted a For Engines of 300 mm (!LS in.) Cylinder Bore and Less The particulars to be submitted are to include the following.
Sectional Assembly Puu hd Staterial specifications
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' Description and results of spin tests, burst tests, and containment teus FLPNI and teinperature limitations Operating rptn and tetuperatures Ntrew calciolatsons snav lae sulwnatted in lacil of ferpetted spin teds. lnergt tests. and n.a.unaw..t sea. As
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6 For Engines wish Cylinder Boree Greater than 300 mm (!!.3 in.) Plans and data as reymred for gas turinnes per 33.17 as wcll as the following.
lhscriptiosa and roults of spis tots. Inarst tests, cont.amment tests. (as applicable; RPNI and temperature limitations Operatmg rpm aw' temperati.re 34.18.3 Design Basis a For Engines of 300 mm (!!.S In.) Cylinder Bore and Less Tur.
hocharger and supercharger will be accepted on the basis of m.um.
facturer's certification nI spin or burst test resnits. and the engme manufacturer's triarantee that the limits of rpm and temperature will not he etceeded. 2s an alternative. detail doign stress calculations
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may be subtnitted for review.
6 For Engines srith Cylinder Bores Creater than 300 mm (!!.S in.) Tnthochargers are to meet the applicable requirements of Sec.
tion 33 for gas turbines, stCfloN 34l7 Internal. combustion Engmes I
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