What should be the Flange Rating for LPG / Caustinc Service ???
What should be the Flange Rating for LPG / Caustinc Service ???
(OP)
I am working on a LPG sweetening project in which I am using 2" Sch 80 pipe . The Design pressure is 16.6 barg and temperature is 60C.
My questions are :
1) I am using Carbon Steel A106 pipe . Is carbon steel is suitable for LPG / caustic service ?
2) If carbon steel is acceptaable , then what will be the flange pressure rating . According to ANSI B16.5 150# rating , A105 flange can sustain 18 barg at 60C . Is there any particular requirement that for LPG srvice flange rating should be above 150 # ?
3) Is there will be a problem in welding a 2" Sch 80 pipe with 150 # rating .
Thankyou and Reagrds
Muhammad Assad Ahmed
Mechanical Engineer
My questions are :
1) I am using Carbon Steel A106 pipe . Is carbon steel is suitable for LPG / caustic service ?
2) If carbon steel is acceptaable , then what will be the flange pressure rating . According to ANSI B16.5 150# rating , A105 flange can sustain 18 barg at 60C . Is there any particular requirement that for LPG srvice flange rating should be above 150 # ?
3) Is there will be a problem in welding a 2" Sch 80 pipe with 150 # rating .
Thankyou and Reagrds
Muhammad Assad Ahmed
Mechanical Engineer





RE: What should be the Flange Rating for LPG / Caustinc Service ???
2.) ANSI#150 is OK for your design pressure and temperature. If there is a requirement for higher pressure, then you are using an incorrect piping design specification. Apparently your piping design spec covers only systems that will be operating at <= 16.6 Barg and 60ÂșC. You must find out if your system has a possibility to reach higher pressures.
3.) No problem welding 2" Sch 80 to compatible materials.
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RE: What should be the Flange Rating for LPG / Caustinc Service ???
My reference is a Corrosion Data Survey, 5th Edition, compiled by Norman E. Hamner, National Association of Corrosion engineers, Houston, Texas, 1974.