hydro test

Hello, it is not advisable to apply paint/primer on the welded joints prior to hydro test, because , on application of paint or primer on the welded joint, may not reveal the minute leaks, and also, if any leak is detected, the paint is to be removed throughly for repairs of the joint,which will cost you time , labour, and money.And also the joint repaired, may be not of good quality.

Hello, it is not advisable to apply paint/primer on the welded joints prior to hydro test, because , on application of paint or primer on the welded joint, may not reveal the minute leaks, and also, if any leak is detected, the paint is to be removed throughly for repairs of the joint,which will cost you time , labour, and money.And also the joint repaired, may be not of good quality.

So true! thats why he said it twice!

thanks gentlemen for ur positive response.but if u gothrough ASME 31.3 PARA 345.3.1 it is written "all joints may be prime and painted prior to leak testing unless a sensitive leak test is required." can u give some comments on this statement. I will be very thankful for you.

Thank you.

<Burp>

Common sense, innit?

Why paint the things if they are to re-welded following a failed hydro-test <Belch>?