[Abhijit N]

This is a very good article & the current reality in the world of EPC.

[Abhijit N]

Option#1 sounds great with minimum changes required.
Thank you for your response & now I do understand a bit about the way hydro-testing is done in similar situations.

[Abhijit N]

Thank you for the reply Jop.

Let me try & give you more information regarding the same though I myself is not too sure how they are going to do it.
Pls refer to the attached sketch/iso for the line route info connecting two equipment.
What is the ideal way of doing the hydro-test for this line? Do we need hydro test vent & drains?

Jop Wrote-
– Are you really going to test through the equipment?—I am not really sure about it.
– If you are not going to test through the equipment then how are you going to isolate the piping from the equipment?–We have spec. blind at one end but nothing like it on the other end. Then I am not sure what is the means of isolating it from equip?
– How are you going to fill the piping with hydro-test fluid?–If not the test is not together with equip. I think we need to have these High point vent / drains for sure.
– What size are these specific lines (connected to the equipment)?–6″

Looking forward to your feedback on above situation.

Regards,
Abhijit

Attachments:

• Hydrotest.pdf

[Abhijit N]

Hi all,

Correct me if I am wrong.

Lines are tested together with equipment connected. Which also means, the line which is starting with vessel A to vessel B may not have hydrotest vent & drains as the connected equipment will have it & can be used for the required purpose.

Looking forward to any correction as per the discussion we are having on this topic in this forum.

Jop-Pls help.

[Abhijit N]

Thanks for the reply Jop.

Issue #1 – Line size is 20″ gas transport line. & the distance of travel is 500 meters.
The difference in the spans Liquid v/s gas is as follows 18 v/s 11 which is a considerable difference.

WRT the ASME B 31.3 it is mentioned that “345.3.2 Temporary supports. Piping designed for vapor or gas shall be provided with additional temporary supports, if necessary, to support the weight of test liquid.”

So the conclusion would be Design the sleeper for vapor filled spans however the provision for temp. Test supports are to be taken care for Hydro test.

Issue #2- ASME 31.3 talks about both type of test hydro as well as pneumatic however our company std. gives a caution on pneumatic testing should be only used when we can’t do hydro testing & pneumatic testing decision is mostly discouraged. Issues in Hydro testing like corrosion or where the traces of any liquid testing medium can’t be acceptable etc. but it seems in my case of NG the hydro test will not be an issue as long as we clean it with hot air, steam etc. (what you guys think? is it ok for NG service).
AI in not involved in this situation however I think I need figure out if I can get him in.

Issue #3 – Agreed as per my company std. however the Code talks about both. SAFETY consideration says Hydro test if for NG service the traces of water is not an issue.

I think I have got some idea now with this research & Jop’s answer that
1-Hydrotest is a way forward.
2-Support span to be considered should be preferably for liquid service but check with civil for cost impact about the sleeper design & decide whether we can live with vapor span & introduce temp. Supports when hydro testing.

Thanks Jop for the guidance & also all of you pls provide inputs for the said situation.

[Abhijit N]

Thanks for the quickest one Jop I am sure the reason is one of the above list. I will post the conclusion shortly.
Till then keep your thoughts/past experiences coming inn.

Thnx

[Abhijit N]

Thanks for the quickest one Jop I am sure the reason is one of the above list. I will post the conclusion shortly.
Till then keep your thoughts/past experiences coming inn.

Thnx

[Abhijit N]

Many of the above points are true however, there is a specialized group called Piping Stress Engineering who are specialists in managing these stress critical lines to make them safe.
Generally Stress guys will advice the supporting arrangement, Pipe rouing configuration so as to keep the allowable loads within limits.

As you are from Structural Team you may not be aware about the same.

Thanks for the inputs.

[Abhijit N]

Many of the above points are true however, there is a specialized group called Piping Stress Engineering who are specialists in managing these stress critical lines to make them safe.
Generally Stress guys will advice the supporting arrangement, Pipe rouing configuration so as to keep the allowable loads within limits.

As you are from Structural Team you may not be aware about the same.

Thanks for the inputs.

[Abhijit N]

Any info on this? It is not in API 6D or ANSI B16.10 then where one can get this info? I am curious…

[Abhijit N]

Any info on this? It is not in API 6D or ANSI B16.10 then where one can get this info? I am curious…

[Abhijit N]

Greatful for the valuable inputs Jop.
Transportation is a great concern in modulerization however if we manage it well nothing likeit.

[Abhijit N]

Greatful for the valuable inputs Jop.
Transportation is a great concern in modulerization however if we manage it well nothing likeit.

[Abhijit N]

Bruce with the content above your CV must be short, sweet & yet so impressive.
I liked the career profile very much.

[Abhijit N]

Could you pls explain what is S-O-L?

[Author]

Posts