RE: CET and MDMT

From: <Samuel>
Date: Fri Jun 29 2001 - 15:04:00 EDT

The CET specified as +40 DegF, appeared on one old heat exchanger drawing back to 1980, and it may not be used anymore for the current pressure vessel design. The heat exchanger was made in Port Coquitlam, BC. There was no any stipulation for MDMT on all available document for this equipment. What I need to know is whether there were/are some relationships between the old CET and new MDMT.

Best Regards,

Samuel Liu

-----Original Message-----
From: Christopher Wright [mailto:chrisw@skypoint.com] Sent: Thursday, June 28, 2001 8:32 PM
To: ?
Subject: Re: [PipingDesign] CET and MDMT

>Does anybody can help me to determine the relationship between CET
(Critical
>Exposure Temperature) and MDMT (Minimum Design Metal Temperature)?
I confess I've never heard the term CET. The MDMT pertains to resistance to brittle fracture in carbon and low alloy steel. The MDMT is used to determine the need for Charpy impact testing. Just guessing, but I daresay the the CET is some sort of upper temperature limit relating to creep or metallurgical effect. The MDMT reflects a limit on low temperature service.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

http://www.skypoint.com/~chrisw

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[Non-text portions of this message have been removed] Received on Fri Jun 29 15:04:00 2001