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by Big Pete
Wed Jan 09, 2019 10:02 am
Forum: The Workshop
Topic: Engine cannot start
Replies: 17
Views: 561

Re: Engine cannot start

Oh Merlyn!

Trike has been long banned, very nasty stuff.

BP
by Big Pete
Mon Jan 07, 2019 12:47 am
Forum: The Workshop
Topic: Premature pipe failure
Replies: 5
Views: 264

Re: Premature pipe failure

I recently had an email from an old Cadet of mine and he told me that he was on a Diesel Electric PSV, and they had found that the Electromagnetic field from their 3 phase 690 Volt power cables was inducing a circulating voltage in the pipework! Which I had never heard of before, might be relevant.
BP
by Big Pete
Fri Jan 04, 2019 10:07 am
Forum: The Workshop
Topic: Dirty/brown/orange colour cooling water
Replies: 1
Views: 83

Re: Dirty/brown/orange colour cooling water

Possibly while the system was drained down for the overhaul work, the insides of all the cooling system corroded and this is now coming into the cooling water. Unitor /Wilhelmsen etc make a commissioning cleaner for de-greasing and de rusting new pipework systems, maybe a power flush with that follo...
by Big Pete
Sun Dec 30, 2018 4:30 am
Forum: The Workshop
Topic: Engine cannot start
Replies: 17
Views: 561

Re: Engine cannot start

Many years ago, I had a problem with a Paxman 4RPH, got a high exhaust temp alarm, seriously high and stopped it, Chief, Third and myself spent a week working on it trying to find the problem, 16 hours on 8 off. No Instrumentation on the engine, just a single exhaust gas thermometer after the Turbo....
by Big Pete
Sun Dec 30, 2018 2:50 am
Forum: The Workshop
Topic: 220V Insulation monitor, Low resistance/Fault from non earth TVs
Replies: 2
Views: 147

Re: 220V Insulation monitor, Low resistance/Fault from non earth TVs

I have had this experience several times and I have heard possible explanation, firstly you must remember that TV sets are designed for use ashore where the power supply consists of one live wire and a Neutral wire which is connected to Earth at the Star point of the supply Transformer. On a ship we...
by Big Pete
Wed Nov 21, 2018 12:51 pm
Forum: The Workshop
Topic: Premature pipe failure
Replies: 5
Views: 264

Re: Premature pipe failure

I suspect that the impressed Current system is either not working correctly or is set up wrongly. Go back to the Instruction Manual and see if there are set of settings for the "as installed" condition" and see if they are still the same. It looks as if there is too much current flowi...
by Big Pete
Wed Nov 21, 2018 12:48 pm
Forum: The Workshop
Topic: Black deposits on fresh water side plate coolers
Replies: 3
Views: 188

Re: Black deposits on fresh water side plate coolers

Poor cooling water treatment. The pipe work is rusting to form Black Iron Oxide (due to lack of Oxygen) which is dissolving in the circulating water and being deposited by Galvanic action onto the Heat Exchanger Plates which are less re active than the steel pipes.# Same as the steel Hull corrodes, ...
by Big Pete
Sun Nov 18, 2018 1:30 pm
Forum: The Workshop
Topic: Stern tube
Replies: 2
Views: 270

Re: Stern tube

There should be a Hydrostatic pressure balance between the water outside and the oil inside, because Sea Water is more dense than oil the stern tube header tank is always higher then the Sea Water outside, in proportion to the different SGs. Has the Draught aft increased ? That might cause Sea water...
by Big Pete
Tue Oct 23, 2018 9:29 am
Forum: Crew Mess
Topic: working in the UK
Replies: 2
Views: 307

Re: working in the UK

There used to be a lot of Canadians working in the North Sea employed by British Companies on British Ships, through British Agencies, the North Sea is picking up again so may be worth having a try. They will pay your Air Fares for each trip.
by Big Pete
Wed Oct 10, 2018 11:35 pm
Forum: The Workshop
Topic: Load line regs
Replies: 2
Views: 268

Re: Load line regs

All valves connected to the ships shell or side plating have to be spheroidal Graphitic cast iron or cast steel, if they fracture and break off the ship will sink! Similarly if the pipe between your Fresh Water Generator and the overboard valve rusts through- Hot concentrated Salt Water so very like...
by Big Pete
Fri Sep 21, 2018 10:40 am
Forum: The Workshop
Topic: OSD18
Replies: 1
Views: 277

Re: OSD18

The size of the Gravity Disc is chosen according to the specific Gravity of the oil to be purified at the temperature at which the oil will be purified.
by Big Pete
Fri Sep 21, 2018 8:48 am
Forum: The Workshop
Topic: Cooking oil used on shipping run
Replies: 2
Views: 255

Re: Cooking oil used on shipping run

by Big Pete
Tue Sep 18, 2018 11:37 pm
Forum: The Workshop
Topic: Cooking oil used on shipping run
Replies: 2
Views: 255

Re: Cooking oil used on shipping run

Interesting 22,00 litres for a voyage, looks to be a small feeder container ship, maybe 1590 NRT, 3,000 DWT, about 3,000 kW. Doesn't say what the length of voyage is, or if the fuel was used for everything or just the auxiliaries. They burnt 22,000 litres of Bio Fuel, maybe 19 tonnes in total and &q...
by Big Pete
Wed Aug 29, 2018 8:58 am
Forum: Crew Mess
Topic: New engine
Replies: 392
Views: 120928

Re: New engine

Lots of ways to use the waste heat, boiler in the exhaust stack, use the engine cooling water and trubo charger air coolers to preheat the feed water and generate steam to drive a steam turbine and either generate electricity or mechanically feed the power back into the shaft. Turbo chargers are so ...
by Big Pete
Mon Aug 27, 2018 12:31 am
Forum: Crew Mess
Topic: "Nanotechnology can cure shipping's sulphur conundrum"
Replies: 3
Views: 332

Re: "Nanotechnology can cure shipping's sulphur conundrum"

This sounds like a fantastic idea if true. I imagine that there would be considerable economies of scale, and because installing the plant on the ship has a capital cost, maintenance cost and causes loss of earnings due to the volume and weight taken for the plant, and also will require Man hours to...

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