Search found 866 matches

Go to advanced search

by Big Pete
Sat Aug 15, 2009 9:49 am
Forum: The Workshop
Topic: Fault Finding 2
Replies: 11
Views: 5158

Re: Fault Finding 2

I used to think something similar myself, but, when you think about it, if you have several 10 mm diameter holes right through a filter, the oil will take the line of least resistance, and even if some goes through the mesh, the debris filtered out will not stay on the upstream side of the filter, b...
by Big Pete
Thu Aug 13, 2009 11:27 pm
Forum: The Workshop
Topic: Fault Finding 2
Replies: 11
Views: 5158

Re: Fault Finding 2

Don't even joke about it Martin, I was Chief on an old tanker with 2 V12 Pielsticks, the original L.O purifiers ( 1 per engine) had long been out of service and a single, totally indaquate, little purifier installed instead. AS a consequence the main engine L.O. filters got dirty very quickly. This ...
by Big Pete
Tue Aug 11, 2009 11:05 pm
Forum: The Workshop
Topic: Fault Finding
Replies: 15
Views: 14016

Re: Fault Finding

There were 4 identical thrusters and only one was tripping out.... Eventually I found the problem was a faulty overload unit in the main breaker. The common problem I found with most ex Communist block Engineers is that they are unable to see that some problems would affect all identical pieces of m...
by Big Pete
Tue Aug 11, 2009 12:21 am
Forum: The Workshop
Topic: Fault Finding
Replies: 15
Views: 14016

Re: Fault Finding

Every time I rejoined that ship there was a "surprise" for me. One time I joined and the other crew had had problms with one Electric Stern Thruster tripping out on overload. The ship hads been working for 16 years in the North Sea, and it was Summer time. There were 4 identical thrusters,...
by Big Pete
Sun Aug 09, 2009 11:20 pm
Forum: The Workshop
Topic: Fault Finding 2
Replies: 11
Views: 5158

Fault Finding 2

15 years ago I was "on board co-ordinator" (Company spy) on an oil tanker owned and manned in Batumi, Georgian Republic, (Former USSR). I represented the British management company. It was a very scary trip. The Chief Engineer informed me that one of the Laval Purifiers had to be cleaned m...
by Big Pete
Sun Aug 09, 2009 9:28 am
Forum: The Workshop
Topic: Fault Finding
Replies: 15
Views: 14016

Re: Fault Finding

When my relief explained the situation to me he was unable to give any logical reason why the problem was caused by low water pressure. He just kept insisting that the problem was due to low water pressure. My first concern was safety, the hydrophore tank is a pressure vessel and its working pressur...
by Big Pete
Mon Aug 03, 2009 12:52 am
Forum: The Workshop
Topic: Fault Finding
Replies: 15
Views: 14016

Fault Finding

A couple of years ago I was Chief Engineer on a Platform Supply Vessel. The ship was fitted with 3 identical Mitsubishi Purifiers (Westfalia clones) one for the L.O. on each main engine and one for Gas Oil. All 3 were supplied with a common high pressure water supply from the Hydrophore/ Pneupress s...
by Big Pete
Sun Aug 02, 2009 12:31 am
Forum: The Workshop
Topic: Packing material for water cooled prop shafts
Replies: 19
Views: 8065

Re: Packing material for water cooled prop shafts

Probably any natural fibre coated in Tallow will do, I don't think it does any harm to give the packing a liberal coating of grease when you fit it either. Obvious key points for anyone not used to this old type of seal is that the shaft should be polished as smooth as possible so it does not shred ...
by Big Pete
Sat Aug 01, 2009 11:51 pm
Forum: The Workshop
Topic: Crankshaft Deflection
Replies: 22
Views: 17466

Re: Crankshaft Deflection

One thing I didn't mention earlier is that if the engine has a camshaft drive chain, the tension in that will try to lift the crankshaft and bend it. This bend will always be in the same direction in relation to the engine , but will vary its direction relative to the crankshaft as it turns.(same as...
by Big Pete
Sat Aug 01, 2009 9:30 am
Forum: The Workshop
Topic: Conrod question
Replies: 15
Views: 7543

Re: Conrod question

Hi Guys, I can see how the surface roughness of the fractures surfaces ensure perfect alignement when the rod is re-assembled. For the fracture to fit together perfectly when the rod is re-assembled it must be a "short", brittle fracture, this implies that the cast material is not at all d...
by Big Pete
Fri Jul 31, 2009 3:38 am
Forum: Training Room
Topic: 3rds EKG-Double Bottom Tank Question
Replies: 4
Views: 7519

Re: 3rds EKG-Double Bottom Tank Question

One important function of the double bottom tank is structural strength. The first ship to be fitted with double bottom tanks was Brunel's S.S. Great Britain and she went aground on the Irish Coast on her maiden voyage and survived intact for a year before she was salvaged, and she is still with us ...
by Big Pete
Fri Jul 31, 2009 3:16 am
Forum: Training Room
Topic: Another second class motor question
Replies: 2
Views: 2603

Re: Another second class motor question

Hi Walker, I haven't sailed on a 15, 000 ton cargo ship. The place to find this information is on a Classification Society Website, where you will find the rules that determine these things. If the plating is made of high tensile steel it will be thinner than if made of ordinary steel. If you were l...
by Big Pete
Fri Jul 31, 2009 2:32 am
Forum: Training Room
Topic: difference between a blower and a compressor
Replies: 2
Views: 15314

Re: difference between a blower and a compressor

I think you have got it pretty well covered. To me a blower would always be a rotary device, designed for large flow rates with a low differential pressure. Turbocharger, supercharger, Rootes blower, even an electric fan for aerating a sewage plant. A compressor on the other hand, may be reciprocati...
by Big Pete
Fri Jul 31, 2009 2:07 am
Forum: Training Room
Topic: 3rd class motor question
Replies: 2
Views: 2732

Re: 3rd class motor question

Hi, You were actually asking about the clearance volume of the cylinder, Martin told you how to calculate the swept volume. The clearance volume is the space above the piston when it is at top dead centre. The total volume or capacity of the cylinder is the swept volume plus the clearance volume. Th...
by Big Pete
Fri Jul 31, 2009 1:56 am
Forum: Training Room
Topic: Help! Just can't get pass the 2nd Class motor Orals
Replies: 14
Views: 13165

Re: Help! Just can't get pass the 2nd Class motor Orals

I think all the previous posts have covered everything except Fuel. UK Regulations used to be that you should have sufficient fuel on board for the estimated consumption to the next Port plus a safety margin of 3 days or 3% whichever was less. You can always be cought out by the unexpected. I was to...

Go to advanced search