Low Pressure Air Line - Stainless Steel

[StainlessStrategist]

I am trying to compose a letter to an engineer requesting that they consider the use of "as-welded" stainless steel 316L pipe and fittings for low pressure air pipe lines utilized in a wastewater treatment plant, in lieu of seamless. The temperature is 280 deg F or less with a test pressure of 50 PSI. The lines are 12" NPS or less stainless steel. Any suggestions or points to make?

 

[bimr]

The use of stainless steel is governed somewhat by the details of the application which you have not stated.

http://www.exair.com/en-US/Primary Navigation/Knowledge Base/Air Data/Pages/CompressedAirPiping.aspx

 

[stanier]

This application sounds like blower air for a biological reactor. Spiral wound stainless teel is routinely used for such applications in Sydney Water Corporation.

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King

http://waterhammer.hopout.com.au/

 

[StainlessStrategist]

Sorry guys. Agitation Air lines in a WWTP. 30 PSI test pressure.

 

[stanier]

No problem using SWSS or ERW up to much higher pressures for such service. You should however consider a duplex stainless as you may get stress corrosion cracking with the high chlorides seen in WWTPs. SAF 2205 would be a better choice than 316L.

http://www.nidi.org

has some very good articles on such applications.

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King

http://waterhammer.hopout.com.au/