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by Vegman
Wed Oct 05, 2016 6:59 pm
Forum: The Workshop
Topic: Welding on crane boom
Replies: 61
Views: 3743

Re: Welding on crane boom

From what I know - cranes are "optional" to be classed according to the class societies. Some offshore units that have hull and (some ) machinery classed by an IACS society choose to have their offshore cranes surveyed and inspected by a third party that specialises in cranes or by the mak...
by Vegman
Wed Oct 05, 2016 6:52 pm
Forum: The Workshop
Topic: Measuring rudder pintle bearing clearances
Replies: 1
Views: 3565

Measuring rudder pintle bearing clearances

Has anyone done this job in dry dock? We have a two pintle semi balanced rudder- I am working on some docking specs. Is it generally considered acceptable to bend/squeeze the feeler gauges in through the limited gap between the rudder and the lower rudder horn (lower pintle) and between the rudder h...
by Vegman
Wed Aug 12, 2015 3:05 am
Forum: The Workshop
Topic: Plate cooler
Replies: 31
Views: 2757

Re: Plate cooler

Yes have done it on Ulstein built PSV with similar cooling set up as you described , vessel had been operating North sea for many years. It went to a contract in India before it came my way and apparently they had had some problems there because they ordered extra plates but never got around to inst...
by Vegman
Mon Jul 06, 2015 2:32 am
Forum: The Workshop
Topic: Dessicant type air dryers
Replies: 7
Views: 791

Re: Dessicant type air dryers

Ahhh- that makes sense!
by Vegman
Sat Jun 27, 2015 1:38 am
Forum: The Workshop
Topic: Marine Engineering - Practical Tips & Tricks
Replies: 56
Views: 14262

Re: Tips & Tricks

A few more tips and tricks... When trying to remove old valve seats from med, speed engines, if they are stuck and you cant get them out with the regular tools try running a small bead of weld on them and then throwing water on , the expansion and contraction can "crack " the bonding betwe...
by Vegman
Sat Jun 27, 2015 1:25 am
Forum: The Workshop
Topic: Dessicant type air dryers
Replies: 7
Views: 791

Dessicant type air dryers

Has any one sailed with control air dryers of the dessicant type. There are two "towers" or vessels filled with dessicant, while one is on line , the other is regenerating. The on line vessel has the control air passing through it usually from the receiver to the users. The air has to flow...
by Vegman
Thu Oct 23, 2014 8:05 pm
Forum: The Workshop
Topic: tail shaft alignment
Replies: 6
Views: 1830

Re: tail shaft alignment

I actually was an ABS surveyor for a few years. In my part of the world there wasn't any big drydocks or shipbuilding facilities so as far as tailshaft work went I was mainly dealing with tugs , workboats and motor yachts. One thing that often surprised me was that we went to such lengths to align e...
by Vegman
Fri Oct 17, 2014 5:36 pm
Forum: The Workshop
Topic: tail shaft alignment
Replies: 6
Views: 1830

Re: tail shaft alignment

Thanks Rum Baron and JK- I have seen figures for alignment ofsets to take in to account thermal growth but I also dont recall ever seeing any for hydro dynamic lift. Re the screw in probes- can you recall the magnitude of the lift that was being recorded? Also does anyone know any rule of thumb figu...
by Vegman
Mon Oct 13, 2014 8:30 pm
Forum: The Workshop
Topic: tail shaft alignment
Replies: 6
Views: 1830

tail shaft alignment

As we know most journal bearings including stern tube bearings work on a hydrodynamic wedge type principle, such that at full speed the shaft is lifted slightly by the oil pressure and also not longer exactly centered port starboard in the journal. I am not exactly sure however of what magnitude thi...
by Vegman
Mon Oct 13, 2014 8:23 pm
Forum: The Workshop
Topic: Injection pump sticking problem in Wartsila 32 engines
Replies: 8
Views: 3862

Re: Injection pump sticking problem in Wartsila 32 engines

My vessel had a similar problem sometime in the past( its an MAN med speed)-Not sure if the exact cause was ever determined , but we changed to the practice of always changing to diesel fuel for a at least 30 min before shut down, and the problem so far hasn't come back.
by Vegman
Sat May 24, 2014 9:28 am
Forum: The Workshop
Topic: High pressure sodium lamps
Replies: 4
Views: 1122

Re: High pressure sodium lamps

Actually it turned out not to be the ballast but the lamp.
Apperently this cycling is typical behaviour for a HP sodium lamp as it nears the end of its life.
The wikipedia page on HP sodium lamps explains the electro-chemical process involved.
by Vegman
Wed Apr 09, 2014 6:39 am
Forum: The Workshop
Topic: High pressure sodium lamps
Replies: 4
Views: 1122

Re: High pressure sodium lamps

Thanks- I thought so- unfortunately no spares, but at least I wont have to climb the foremast, the ballast unit is at the bottom.
by Vegman
Mon Apr 07, 2014 3:34 am
Forum: The Workshop
Topic: High pressure sodium lamps
Replies: 4
Views: 1122

High pressure sodium lamps

Does anyone know what causes high pressure sodium lamps to come on and off intermittently? We have a floodlight that comes on brightly for few minutes, then goes dim, but not completely out, it sputters and flickers for a while and then comes on again at full brightness. It cycles like this every th...
by Vegman
Sun Feb 23, 2014 5:09 pm
Forum: The Workshop
Topic: under voltage and over current trip
Replies: 12
Views: 8188

Re: under voltage and over current trip

Google may be your friend , but unfortunately it does not always match conditions in the real world. UV trip is relatively easy to test on most generators while the machine is running.- if the machine has voltage trim or has the breaker easily adjustable settings. The overcurrent trips are more comp...
by Vegman
Sat Jan 18, 2014 2:34 am
Forum: The Workshop
Topic: Westfalia Lub Oil Separator
Replies: 6
Views: 2166

Re: Westfalia Lub Oil Separator

Good Day , Are you saying the big loop is in parrallel to the delivery line.? If it is so and not going into a return line there would be no flow during the intercycle period so the hot water would tend to go cold anyway. Its possible that it was meant to provide some sort of continuous flow as you ...

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