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How about valve sticking to valve guide? Dirt in lub oil? Incorrect valve clearance? Lauri

Don't know why you are asking for such a high efficiency. My first approach would have been a centrifugal pump with ejector priming but of course the efficiency is not exacly 78%. On the other hand it is something easily available and reliable and has a long service life. lauri

Many thanks for the replies I have received. CooCS could you possibly e-mail me the list of contents of your rule book? (lauri.erroll@wartsila.com)

I agree with the two comments you have already received. If this is a classed installation note that classification requires steel pipes for flammable liquids. Note also that class forbids threaded connections for pipes carrying flammable liquids. Even though it is sometimes possible to do...

Wouldn't it be good shipping practice to just specify frequent surveys of ballast tanks? I don't mean special class surveys but just visual inspections by the crew. Remember Erika and Prestige! Best regards, Lauri

Hope I am not sending you on a wild goose chase but how about companies like: -Hauhinco -Adwatec -Danfoss -Hytar lauri

Depends very much on the type of application´you are considering. How about: a) ejector b) water hydraulics / pneumatics based multiplier for small flow high pressure lauri

Would anyone be in possession of "Register of Shipping of the People's Republic of China, Rules for the Classification and Construction of Fixed Offshore Platforms, 1994 or 1992"? lauri

Our building spec asks for "glass foam" to insulate trace heated fuel piping. Would this be polyurethane foam? Some special additives in it? Wouldn't just steel plated rockwool be a superior solution? lauri

Many thanks Stuartj. This helped a little. Have also got a maker's recommendation of up to 5 m/s for rubber lined pipes. Any comments? Lauri

Could anyone give a hint where to find recommended max. sea water velocities for cunifer, al bronze and rubber or plastic coated pipes used onboard ships. Pipesizes DN32...DN1000.