Dear Expert,

As I am working with piping stress analysis as per design code ASME B31.3 2016 edition, the 72 inch sea water line (Internally cement lined) with pipe material of (305) APL 5L B, line D.T 75 degree C and found that the TEE point stresses are getting failed (allowable stress value - 206842 Kpa). Please note that TEE has been considered as Reinforced condition.

However we are changing material to qualify the TEE joint with higher grade (307) APL 5L X70 at TEE portion along and we have verified the results and found that the allowable (SA) are not changing as per design code (allowable stress value still - 206842 Kpa).

Kindly advice how to solve the allowable stress issue and how to qualify the TEE failure, advance response highly appreciated.

By
Rajivgandhi.R