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Low Temperature Bolts For H2S Service

Low Temperature Bolts For H2S Service

Low Temperature Bolts For H2S Service

(OP)
Has anyone experience of getting A320 L7M bolts to achieve  the specified minimum toughness values at -120 deg C?

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

RE: Low Temperature Bolts For H2S Service

I believe these are rated to -40C, not -120C which is a cryogenic application.

Alternatives NACE material for the stud would be ASTM A193 L7M with the ASTM A194 2HM nut.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: Low Temperature Bolts For H2S Service

Whereas the impact test temperature for L7M is -100F (-73 C), your chances of finding L7M meeting the required energy absorbed values at -150C are nil based on old impact test data that I've seen.

RE: Low Temperature Bolts For H2S Service

Why would the bolts be in H2S service, are they inside the piping and vessels?

RE: Low Temperature Bolts For H2S Service

(OP)
No - they are externally located but are still to meet the requirements of ISO 15156.

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

RE: Low Temperature Bolts For H2S Service

SS304L is commonly used in Cryogenis Environments, also you could have them coated in PTFE or Xylan/Xylar.  Don't know if this is any help?

RE: Low Temperature Bolts For H2S Service

(OP)
We're going the ISO 10423 route and trying ASTM A453 Gr660 Class D.  Fingers crossed on the Charpy tests.

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

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