Insulation flange
Insulation flange
(OP)
I have to route a 6” CS pipe underground, then above ground connected to a ss 316L pipe, do I need an insulation flange for this connection?
Thanks in advance for your replies.
Thanks in advance for your replies.





RE: Insulation flange
http://virtualpipeline.spaces.msn.com
RE: Insulation flange
Neglecting CP, one could consider an insulating flange arrangement if the fluid conductivity warranted it but then reliability and maintenance would have to be factored into the equation as well as connections to a common earth (if both sides of the joint see the same earth then insulation is a waste of time). An alternative would be to weld overlay the carbon steel flange.
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Insulation flange
excuse me for my ignorance, but what is cp?
Both thank you for your helpful replies.
RE: Insulation flange
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Insulation flange
But the above ground part is connected with the earth (shoes-bridge),
So my conclusion is that it has no use to provide insul/isol.(?) flanges.
RE: Insulation flange
RE: Insulation flange
RE: Insulation flange
http://virtualpipeline.spaces.msn.com
RE: Insulation flange
Anyway, what is the driver for carbon steel being connected to stainless steel in the first place?
It would also pay you to look at NACE RP0169 for dealing with the buried section of pipe.
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: Insulation flange
NACE REFERENCE READING:
CORROSION ENGINEERING Fontana and Greene
The Corrosion Handbook, Herbert H. Uhlig
Process Instruments and Control Handbook
Localized Corrosion NACE Publication
METALS SECTION Corrosion Data Survey
NACE TRAINING:
NATONAL ASSOCATION OF CORROSION ENGINEER’S:
CORROSION PREVENTION BY CATHODIC PROTECTION, HOUSTON, TEXAS
NATONAL ASSOCATION OF CORROSION ENGINEER’S:
CORROSION PREVENTION IN OIL& GAS PRODUCTION, HOUSTON, TEXAS
NATONAL ASSOCATION OF CORROSION ENGINEER’S:
BASIC CORROSION COURSE, HOUSTON TEXAS
Leonard Stephen Thill
RE: Insulation flange