Hydro test of pressure vessel with scaffolding inside

• Feb 17, 2022

• #2

LittleInch

Petroleum

Mar 27, 2013

22,609

What is it holding up?

Of its just access to do things after hydro I can't see too many issues but the devil is in the detail. Any drawings?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

Upvote 0 Downvote

• Feb 17, 2022

• #3

Guest

As long as it doesn't float away I don't see a problem.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

Upvote 0 Downvote

• Feb 17, 2022

• #4

r6155

Mechanical

Jan 12, 2010

2,949

Perhaps it can be useful for applying surface protection or for in-service inspection.

Regards

 

Upvote 0 Downvote

• Feb 18, 2022

• Thread starter
• #5

SJmetallurgist

Mechanical

Apr 8, 2006

47

@LittleInch - drawings wont be able to share due to proprietary issues. But got yr point.
@ironic metallurgist & r6155: the main concern I find is that the packing/pads used to fix scaffolding inside the vessel should not mask a leak in the vessel. also, scaffolding pipes are hollow, not sure whether its safe to have a pressurized water around hollow pipes.

Thanks all of you

 

Upvote 0 Downvote

• Feb 18, 2022

• #6

gtaw

Structural

Feb 10, 2006

1,984

If the ends of the pipe scaffold are not sealed, the pressure inside the pipe will be the same as the pressure inside the vessel. If the pads are welded such that the weld is only part way around the perimeter, water will enter and exit under the pads. Any leaks that are through the pressure boundary of the vessel will allow water to leak through and observed during the test. Just make sure the welds securing the pads are discontinuous.

Best regards - Al

 

Upvote 0 Downvote

• Feb 18, 2022

• #7

r6155

Mechanical

Jan 12, 2010

2,949

Avoid inside pads.

Regards

 

Upvote 0 Downvote

• Jul 7, 2022

• #8

Stallionbreed

Materials

Nov 17, 2021

24

What was the fabricator's reason?

As others have pointed out, you have to check to make sure the scaffolding is secured. Are the pads and scaffold rated for the pressure?

Is there a liner or coating inside the equipment? if so, make sure the scaffold doesn't damage that during the test.

 

Upvote 0 Downvote

• Jul 22, 2022

• #9

Dhurjati Sen

Materials

Dec 14, 2017

982

There is no Inspection Code like API or something belonging to the client that govern this construction?

If no, then the manufacturer is quite noble not to put anything else inside the vessel apart from scaffolding and going ahead with hydrotest.

Hope they remove the scaffolding without resorting to any hot job or grinding or even cold cutting.

Also pray that an internal inspection is carried out after scaffolding removal.

DHURJATI SEN

 

Upvote 0 Downvote