Original Nelson curve was prepared by G A Nelson in 194, using two parameters; operating temperature and partial pressure of Hydrogen with respect to HTHA ( High Temperature Hydrogen Attack.) This curve was first published by API in 1970 and then underwent several changes after noticed cases of HTHA.
Presently widely accepted specification against HTHA is API 941. Fig. 1 of API 941 defines the temperature limits of various materials against partial pressure of Hydrogen.
If Coincident point (temp and pH2) falls above particular material line, then HTHA is likely to happen for that material for these conditions.
With Best Regards,
Jignesh R Rana
Linde Engineering India Pvt. Ltd.
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From: pradip kumar sil <pradipsil@gmail.com>
To: materials-welding@googlegroups.com
Date: 04-08-11 13:43
Subject: [MW:12101] Nelson curve / hydrogen service
Sent by: materials-welding@googlegroups.com
Dear everybody,
Can anybody tell me how can select material for hydrogen service AS PER NELSON CURVE
Regards
Pradip
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