Air cooler tubes BWG
Air cooler tubes BWG
(OP)
For duplex tubes 2505, O.D 25mm, in a highly corrosive environment with hydrogen and 6.2% wet H2S.
Pressure in 153.1 Barg, Pressure out 14 Barg
Temperature in 139ºC, Temperature out 60ºC
Velocity in 8.8m/s velocity out 7m/s.
Are BWG 16 tubes acceptable for an air cooler?
lm





RE: Air cooler tubes BWG
RE: Air cooler tubes BWG
There are really two questions here requiring more information before you can make a material choice;
1). Did you run a minimum wall calculation using the formula for tubing in ASME Section VIII, Div 1 for the stated conditions?
2). What does a highly corrosive environment with hydrogen and 6.2% wet H2S mean? Is this highly corrosive because of only hydrogen and H2S or are there other contaminants to consider?
RE: Air cooler tubes BWG
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Plymouth Tube
RE: Air cooler tubes BWG
RE: Air cooler tubes BWG
internal corrosion
-if you're under the NACE /ISO 15156 then you need to be carefull. The partial pressure limit of H2S for superduplex is 0.2 Bara (see Part 3 of nace /iso).
external corrosion
-139°C can cause external corrosion problem (CSCC)for a duplex materials in a marine (high chloride) environments.
see norsok M001 material selection (110°C is the limit for SDuplex)
http://w
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Corrosion Prevention & Corrosion Control
RE: Air cooler tubes BWG
This air cooler will cool down the effluent from hydro cracking high pressure separator, which comes from first stage reactor.
As contaminants we will have: Hydrogen, water with H2S, ammonium bisulphide less than 12%wt, amonium chloride, and HCL.
lm
RE: Air cooler tubes BWG
If you use a duplex material, you may want to look into API 938 - C and fabricate a mock-up for testing. I witnessed the after effects of an ARDS Unit 2205 air cooler failure so maybe my opinion is jaded.
RE: Air cooler tubes BWG
Flow related issues in 2205 are very possible, it isn't immune to corrosion, just fairly good. You might consider a super duplex, and have CFD done for flow related issues in the deisgn.
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Plymouth Tube