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by Big Pete
Sun Sep 20, 2009 11:22 pm
Forum: The Workshop
Topic: CAT Problem
Replies: 21
Views: 5198

Re: CAT Problem

I note that you say the sea water overboard temp is high, as well as the Fresh water. The amount of heat transferred in a system is always proportional to the change in temperature and the mass flow of fluid. With identical engines running at the same power the quantity of heat produced should be th...
by Big Pete
Fri Sep 18, 2009 12:10 am
Forum: The Workshop
Topic: Vacuum distillation plant
Replies: 8
Views: 7854

Re: Vacuum distillation plant

The system is pretty much self regulating, if it is properly designed and installed. The sea water pump cools the condenser and I would expect about 6to 10 C temperature rise across the condenser. Some of this pre-heated water is fed through a flow control valve into the heater of the evaporator she...
by Big Pete
Thu Sep 17, 2009 6:52 am
Forum: The Workshop
Topic: Corrosion pieces
Replies: 6
Views: 4655

Re: Corrosion pieces

Galvanized piping works very well so long as the entire pipe is galvanised, and therefore at an equal electrical potential. Once there is any local damage to the galvanising it creates a corrossion cell, and you have a problem. Personally I prefer to replace corroded steel pipe with thick wall pipe ...
by Big Pete
Thu Sep 17, 2009 6:38 am
Forum: The Workshop
Topic: Fault Finding
Replies: 15
Views: 12148

Re: Fault Finding

I fully agree about using the entire kit, but some people like to try to save money by only changing the "O" rings they think are worn, and they only order the O rings they think they will use rather than the complete kit. Then of course they have problems. WTF was more or less what I said...
by Big Pete
Thu Sep 17, 2009 6:32 am
Forum: The Workshop
Topic: The nuts and bolts
Replies: 6
Views: 3071

Re: The nuts and bolts

Copper age hardens as well as work hardens. For anyone out there who doesn't know, support the washer on a pice of wire or similar, gently heat to cherry red, (experience as an Engineer again, don't melt it!) and quickly dunk it in cold watergen to lock the crystaline lattice of copper molecules in ...
by Big Pete
Wed Sep 16, 2009 11:50 pm
Forum: The Workshop
Topic: Wartsila vasa 32
Replies: 7
Views: 6081

Re: Wartsila vasa 32

Years ago I was told that running costs, parts, labour & L.O. for a medium speed were double the costs of a slow speed of similar power. The running costs of a high speed engine are double those of a medium speed.
I think, as ball park figures, this still holds true.
BP
by Big Pete
Wed Sep 16, 2009 11:43 pm
Forum: Crew Mess
Topic: Assumption Kills
Replies: 15
Views: 6820

Re: Assumption Kills

The sad truth is that it is very hard to change peoples attitudes. I am Chief Engineer on board a ship with Multi National crew. We have the SMS, permits to work, risk assessments etc in place. I am the only Brit, but we have a Canadian and a Panamanian everyone else is from Eastern Europe. However,...
by Big Pete
Wed Sep 16, 2009 6:31 am
Forum: Crew Mess
Topic: Believe it or not
Replies: 4
Views: 2105

Re: Believe it or not

Last I heard was that there were suspicions the ship was carrying the Russina equivalent of Patriot ground to air missile batterries to protect Iranian Nuclear Installations.
BP
by Big Pete
Wed Sep 16, 2009 6:16 am
Forum: The Workshop
Topic: tailshaft wear down
Replies: 6
Views: 9636

Re: tailshaft wear down

I think JK has asked the crucial question here, if he cut an inch of the end of the poker gauge, all is clear.
BP
by Big Pete
Thu Sep 10, 2009 11:23 pm
Forum: The Workshop
Topic: tailshaft wear down
Replies: 6
Views: 9636

Re: tailshaft wear down

The total of the top and bottom readings should stay constant. (There is no wear of the shaft at the point readings are taken) In water reading total 165.4 original total 113.8 difference 51.6 or 25.8 per reading. The difference between top & bottom readings should change as the stern tube beari...
by Big Pete
Tue Sep 08, 2009 12:05 pm
Forum: The Workshop
Topic: A Little Electrical One
Replies: 9
Views: 3708

Re: A Little Electrical One

Wild guess, and it is only that, worn feedback potentiometers on the fuel rack. When the engine rolls the feedback values jump erratically.
by Big Pete
Tue Sep 08, 2009 12:00 pm
Forum: The Workshop
Topic: Crankshaft Deflection
Replies: 22
Views: 16219

Re: Crankshaft Deflection

All I can say is if you want precise limits for your particular engine, and your particular application, the best option is to email the engine maker's service department.
BP
by Big Pete
Tue Sep 08, 2009 11:55 am
Forum: The Workshop
Topic: Reefer chamber compressor losing oil
Replies: 1
Views: 1663

Re: Reefer chamber compressor losing oil

Before I joined one ship the crew were putting oil in the fridge compressor every day, they then orderd and fitted a new compressor (complete with oil seperator) and had to drain oil out every day, until the system stabilised with a constant amount of oil in the circulating gas. I think the only pro...
by Big Pete
Mon Sep 07, 2009 12:19 am
Forum: Training Room
Topic: sea to land
Replies: 10
Views: 6098

Re: sea to land

Good luck with the job hunting, a couple of ideas no one else has mentioned, there used to be jobs advertised in the UK shipping newspapers for ship's engineers to operate & maintain breweries and sugar refineries. A sugar refinery basically has big rollers to crush the cane, water pumps to wash...
by Big Pete
Mon Sep 07, 2009 12:07 am
Forum: The Workshop
Topic: A Little Electrical One
Replies: 9
Views: 3708

Re: A Little Electrical One

With a traditional mechanical/hydraulic Governor, (Woodward) each governor would be adjusted to maintain the engines at constant RPM with a slight "Droop". (i.e. the RPM will drop off slightly as load increases, preferably in an identical way on all engines that can be run in parrellel, to...

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