NACE Standard for perfect drain means after hydrostatic testing? 1

[Dawoon]

I'm looking for the NACE Standard for hydrotesting.

Is there a perfect drain means for preventing contamination of Cl? (Or any recommended means for drain?)

We had a GHT Reactor which is cladded with S.S. 321.

We should do a hydrostatic test with it.

Unfortunately it's cladded with S.S. 321, there's a possibility that Cl SCC occurs.

Here are the points I'm worried about...

1. Is there any special means to prevent contamination of hydrotesting media (we use C.C.C.? How can we fully drain or dry it? Just an air blowing and purge for long time is an answer?

2. Have you ever experienced hydrostatic testing for an equipment which is capable of occurring Cl SCC? How do you drain totally? Do you have any special technical standard for it?

Thanks for your kindness.

Have a nice day~!

 

[SJones]

http://www.google.com/custom?hl=en&...stainless&btnG=Search&sitesearch=eng-tips.com

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[MikeMet]

If your water has less than 150 ppm don't worry about a thing, just air dry. If you have higher chloride content and can enter the vessel, you can hand dry with no ill effects. The more internals with crevices in the vessel, the more you need to worry about ClSCC from hydrotest water.

There are also additives for hydrotest water that contain very high chlorides to help prevent, or at least greatly minimize the possibility of chloride cracking. Just do some research

 

[strider6]

have a look at this good article:

Hydrostatic Testing of Welded Stainless Steel Fabrications

http://www.australwright.com.au/datasheets/advice/Stainless Steels/Hydrostatic Testing SS.pdf

S

Corrosion Prevention & Corrosion Control