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Heat exchanger materials of construction

Heat exchanger materials of construction

Heat exchanger materials of construction

(OP)
Hi. What is the most reliable  shell and tube material to suit a tube pass temperature of 540 deg C and 1900Kpa H2 gas.
Shell temp is around 440 deg C and 1040Kpa process Steam. [ unit is SMR]

Please review attachment. Assuming it is visable.
Thanks

RE: Heat exchanger materials of construction

Is there any H2S or other corrosive elements in the gas ?

RE: Heat exchanger materials of construction

black...

Where will this replacement unit be located ?

-MJC

  

RE: Heat exchanger materials of construction

hello,

see API 571

Regards,
          roker

RE: Heat exchanger materials of construction

(OP)
SRFISH. No H2s this is a very clean gas stream. Sometimes we have some steam condensate through the system on early start up. We only have about 4 to 6 cycles per year max.
 Where is the unit located does that make a difference?.
 All our equipment is ASME and only API for some storage tanks.
Thanks

RE: Heat exchanger materials of construction

Hello,

I am not a materials specialist but have some observations due to spending years in the heat exchanger industry. I know the A 106 material in the shell is not good enough for this service at these temperatures and pressures. The minimum is C-1/2 MO. The tube side minimum is 1 1/4cr-1/2 MO.

RE: Heat exchanger materials of construction

(OP)
Thanks. The material I am thinking would be appropriate is SA 387. Can you be a bit clearer on your materials description. I guess Your indication is these materials are a grade of Sa ???.
 Do you agree Incaloy 800 H would definately be an over spec for my temps and pressures. We have past experience with cracks in heat affected zones on the Incaloy. Its imperative that good PWHT is conducted after any fabrication work.

RE: Heat exchanger materials of construction

Sorry if I'm a bit lost, but shouldn't API 941 be a strong contender for guidance here?

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/

RE: Heat exchanger materials of construction

Hello,

I believe SA-387 could be used for the tube side if it is at least a grade 11. The shell side alloys couild be SA-204 plate or SA-335 P1 pipe,

RE: Heat exchanger materials of construction

(OP)
Cheers chaps I will check out your thoughts.
BW

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