Search found 27 matches

by Vegman
Sat Apr 18, 2020 6:04 am
Forum: The Workshop
Topic: Jack up Rig ballast and fire pump
Replies: 1
Views: 722

Jack up Rig ballast and fire pump

Good Day, If anyone has an experience on Jack up rigs I hope they can answer this question. A jack up rig sometimes has the hull in the water and sometimes out of the water , at varying air drafts too. But regardless of what position the hull is in it has to have fire water , cooling water and , I t...
by Vegman
Sat Apr 18, 2020 5:33 am
Forum: The Workshop
Topic: Finnøy Gear pressure
Replies: 1
Views: 1406

Re: Finnøy Gear pressure

Hi Mike, not familiar with that Finnoy gear set up, Is the oil pump driven off the gear box and therefore the faster the RPM , that faster the pumps spins? or is it a separate electric driven pump? But I would say no, the clutch pressure should not drop at all under load , providing the oil temp doe...
by Vegman
Sat Apr 18, 2020 5:16 am
Forum: The Workshop
Topic: Diesel Generator low frequency on high load.
Replies: 13
Views: 9617

Re: Diesel Generator low frequency on high load.

Hey Sabih, Well there a a number of things it could be - insufficient fuel or insufficient air or perhaps injection timing is out. 350 kw is just over half the rated power, so you have some major issue there. Could possibly be something to do with the fuel pumps you overhauled- did you spill time th...
by Vegman
Wed Mar 25, 2020 4:13 am
Forum: The Workshop
Topic: bolt materials for Korean and chinese shipbuilding
Replies: 2
Views: 880

Re: bolt materials for Korean and chinese shipbuilding

Dont think so.- Korean and Chinese yards build over 75% of the worlds shipping by tonnage. So they must be doing something right.
by Vegman
Tue Mar 24, 2020 10:30 pm
Forum: The Workshop
Topic: bolt materials for Korean and chinese shipbuilding
Replies: 2
Views: 880

bolt materials for Korean and chinese shipbuilding

Hi, does any one know what the bog standard bolt material or spec is used in Korean , and Chinese shipyards for engine room and pump room piping. All my quick books and cheat sheets seem to indicate ATSM A193 B7 bolts - But they are all geared to The "petroleum industry" . Currently working as tech ...
by Vegman
Tue Oct 09, 2018 6:09 pm
Forum: The Workshop
Topic: Load line regs
Replies: 2
Views: 1763

Load line regs

Hi , hoping someone has had this issue before. We are replacing the overboard discharge butterfly valve for a fresh water generator in drydock , but the class surveyor is telling us that it has to be a non return valve as per load line regs. I think he is wrong. The system was fitted from new buildi...
by Vegman
Wed Oct 05, 2016 6:59 pm
Forum: The Workshop
Topic: Welding on crane boom
Replies: 61
Views: 11410

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 makers rep. F...
by Vegman
Wed Oct 05, 2016 6:52 pm
Forum: The Workshop
Topic: Measuring rudder pintle bearing clearances
Replies: 1
Views: 6339

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: 6968

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: 1865

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: 60
Views: 28488

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 between the sur...
by Vegman
Sat Jun 27, 2015 1:25 am
Forum: The Workshop
Topic: Dessicant type air dryers
Replies: 7
Views: 1865

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 through a...
by Vegman
Thu Oct 23, 2014 8:05 pm
Forum: The Workshop
Topic: tail shaft alignment
Replies: 6
Views: 3329

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: 3329

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: 3329

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...