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Recommended ring gasket material for sour (h2s) service

Recommended ring gasket material for sour (h2s) service

Recommended ring gasket material for sour (h2s) service

(OP)
Hi all,

welding flow lines in a sour service (100ppm to 20,000ppm) and ensuring that:
a. low hydrogen electrodes are used
b. WPS passes NACE Vickers hardness test
c. C.E for pipe materials are not too high...(is 0.45 too low???)
d. pre-heat when possible
e. insulation of weld after welding to delay cooling and leave more time for H to leave the weld
Additional questions are:
1. Is PWHT necessary for every weld?
2. Are there recommendations for ring gaskets for this kind of service?

Thank you.

RE: Recommended ring gasket material for sour (h2s) service


I would go with Teflon for gasket material (often CO2 present in gas with H2S). Could possibly get away with Viton depending on other constituants in gas.

I would complete PWHT for every weld, whether it is necessary or not you might get varying opinions. Hopefully you have a weld spec, it is your risk or procedure to take. I would say what you do for one weld, you should do for all.  

RE: Recommended ring gasket material for sour (h2s) service

Teflon does not work for a Ring Gasket on a RTJ - ring-type joint.  No resielincy(sp), it flows under pressure.

  Check with Flexitallic.  They sell RTJ gaskets and are pretty expert in whak can be used where.

RE: Recommended ring gasket material for sour (h2s) service

mysarah,
Need for pre- or post-weld heating depends on pipe material, wall thickness and minimum temperature.  CE of 0.45 is not low at all.
austsa

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