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When I was at sea on tankers, we had engines of this sort of size. If there was a problem with one cylinder, the piston could be secured at the top of its stroke and the big end disconnected. We would then run on 5 cylinders. We did this on one 25,000 tonne tanker all the way from the Persian Gulf to Western Australia.
Pistons were about 1-metre across.
The last tanker I was on was 280,000 tonnes and powered by a B&W 5-cylinder diesel.
Dave
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
On the same sort of mind blowing lines ,My Uncle took me on a tour of Ferrybridge power station where he worked .The boilers are hung from the ceiling from huge RSJ's because theyshrink by about a foot when they cool down:shock:.Every thing is big big big and it is a fascinating tour ,open to the public i believe (if it's still going that is as it was coal powered).
If there was a problem with one cylinder, the piston could be secured at the top of its stroke and the big end disconnected.
Dave
How did you balance it? Also was it 2 stroke diesel?
Yes, 2-stroke diesel. Balancing not a particular problem with an engine that runs at 115rpm flat out! Revs were reduced, if I recall, to about 85rpm. Even so there was some imbalance and at times this could be felt throughout the ship. Colloquially known as 'honeymoon revs' :shock:.
Now before any of you have nasty thoughts, my Wife was with me on that trip!
Dave
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
That crankshaft was machined by the cutters manufactured by the company I work for.
Superb watching it being heated a bearing at a time and shrunk fit together then milled is amazing. I think the crank weighed about 14 tons if I remember correctly.
, how big are the pistons???
.
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