Pipeline Hydrotest

Sorry. Regarding your question #2, "are you an idiot"? I now believe that the answer is YES!!!!!!!!!!!!

Better not put it in my back yard.

No!

Ok, one exception. If the operating pressure is kept below 14.7PSIG, you can run it.

You're not really serious, are you?

After looking through my "crystal ball" (from the Wizard of Oz, BTW) I foresee multiple catastrophic failures occurring along this pipeline if HT is not done......

IF it is specified by the Engineer of Record, then you do it without question and argument, unless you want to be held in Non-conformance of the Contract Document requirements....also, in the event of failure(s) you will be held liable on many levels!

We are fortunate to share a planet with you and your professional organization........... whom obviously has the superior ability to plan ahead.

Kudos....

You were very eager to take the job and advance payment and work all along 100 km pipeline fabrication. Now when it comes the s**t part you think you can get away without doing the HT?

CR4 ADMIN: Modified Post

Inappropriate Image: Part of this post was modified to remove inappropriate language that violates the CR4 Rules of Conduct.

SORRY TO ALL, i did not mean actual condition.

this is the question asked by an expert to me during an interview. ofcourse i gave same answer as 'NO'. but really wanted to know the options. if we can do 100% RT on all weld joints than is it possible to avoid pressure testing (HT or Air test) ? as we are doing only RT on Tie-in joints as golden joints?

OK. Here's a little thought experiment.

• Fill it with water and give it a squeeze to a predetermined test pressure. Something goes bang and water leaks out. There may be some local problems though the environmental damage will be minimal.
• Instead of filling it with water, fill it with liquefied natural gas and give it a squeeze to the same pressure. The same thing goes bang and it leaks. In the immortal words of David Coal Coleman, "What happened next?"

Simple, isn't it?

The question is 100% RT or UT on all welded joints of pipeline can eliminate requirement of any kind of Pressure test (liquid/gas or other) ?

The answer will depend on the whole purpose of Pressure Test means is it only to check welded joint integrity or complete pipeline system ?

100% RT or UT on well joints of pipeline does not eliminates the requirements of hydrotest while 100% RT with UT can eliminates hydrotest requirement as it is done for the golden joint but its too expensive and time consuming as field joint coating can not be applied and backfilled till the resulats are on.

Second question aswer would be, hydrotest is the way of checking the weld joint integrity plus also relives the resudial stresses associated with weld joints and pipeline laying stress.... called as strength stress.... which is done for 4 hours with 1.4 times design pressure.

@2226

great answer. but where it is written that RT with UT will eliminate HT requirement in pipeline. i need reference please.

pipeline we are doing HT at 1.25 DP not 1.4 DP ?

There is no were written about this but this is the only way u can check and conclude that hydrotest is not required... as it is done for the golden joints. we do not have any option.

Regarding the 1.4DP and 1.25DP it depends n the pipeline class that has been defined in ASME B31.8. I belive its 1.4DP for liquid pipeline....Correct me if I am wrong....