Use of CS Flanges/Blinds for SS Piping Hydrotests
Use of CS Flanges/Blinds for SS Piping Hydrotests
(OP)
Gentlemen/Ladies, Most definately Professionals,
A question has arisen on my new site assignment. I have been tasked with testing a large amount of Stainless Piping and was considering ordering SS Blinds and Paddles to accomplish this but 2 superiors have said that for testing I should only need to have CS Blinds and Paddles to accomplish the testing.
I am of the opinion that it should be similar metals to similar testing gear.
Water to be used at this time is going to be Plant Potable Water and in the winter time Polypropolyne Glycol/Water mix.
Further to testing with fluids I am also of the belief that Carbon tested water should not be used for testing of SS lines. We plan on holding our testing water in a holding tank for transfer back and forth between tests. Thoughts??
I look forward to your responses.
Regards,
A question has arisen on my new site assignment. I have been tasked with testing a large amount of Stainless Piping and was considering ordering SS Blinds and Paddles to accomplish this but 2 superiors have said that for testing I should only need to have CS Blinds and Paddles to accomplish the testing.
I am of the opinion that it should be similar metals to similar testing gear.
Water to be used at this time is going to be Plant Potable Water and in the winter time Polypropolyne Glycol/Water mix.
Further to testing with fluids I am also of the belief that Carbon tested water should not be used for testing of SS lines. We plan on holding our testing water in a holding tank for transfer back and forth between tests. Thoughts??
I look forward to your responses.
Regards,





RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
IMO using CS blinds is "acceptable" if water can be fully drained/dried after the hydrotest. Intricate instruments should be removed from the system prior to the test. Naturally, try to use blinds that still have reasonable coating on them.
austsa
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
http://www.nickelinstitute.org/~/Media/Files/Techn...
http://www.australwright.com.au/datasheets/advice/...
http://www.assda.asn.au/component/rsblog/view/33-h...
It is also generally considered to be good practice to keep stainless steel and carbon steel material separate in the fabrication yard.
For mixed metal piping, MIC corrosion will tend to attack the carbon steel components. In the case of mild steel pipework, hydrotest/storage waters are commonly treated with acorrosion-preventative hydrotest package that contains an oxygen scavenger, a biocide, and, frequently, a corrosion inhibitor. Such treatments are not generally used in the case of stainless steel pipelines and vessels.
http://products.asminternational.org/fach/data/ful...
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
1. Make sure that the gasket is cut without the typical centering pin hole.
2. Some gasket materials are permeable until they're compressed. Obviously, the gasket area at the bore of the mating pipe will not be compressed. (ePTFE is one such material)
donf
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
Vendor 1: We’re estimating that the stainless nozzle will be exposed to iron contaminated water for no more than 3 hours (two hours to fill, one hour for hydrotest), then wiped down post hydrotest. This happens frequently with stainless nozzles, and is considered industry standard. If you would like, we can inquire with a coating supplier, and explore the possibility of doping the stainless items with a rust inhibitor, which may or may not assist in preventing contamination.
Vendor 2: We have experience over multiple projects using carbon steel blinds and carbon steel bolting / nuts without carbon contamination to stainless steel vessels / components. We have never used oxygen, scavenger, corrosion inhibitor during the hydrotesting of SS vessels and we did not intent to use any such compound during the hydrotest. There will be gaskets in place between the carbon steel test blinds and stainless steel flanges during hydrotest. If you have any additional questions, please let me know.
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
With respect to what I interpret to be meant as the re-use of water recovered from previous hydrostatic tests in carbon steel piping systems, maybe that is an issue in that you probably don't want to be flushing an inappropriate amount of entrained mill scale out of your SS piping system after the test.
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
RE: Use of CS Flanges/Blinds for SS Piping Hydrotests
The best advice anybody can give him at this point is to do what his supervisors tell him to. Fortunately, they are not wrong.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek