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[go-fish]

Section 4.4.14.2.1 of API 521 June 2020 states Loss of containment of the low-pressure side to atmosphere is unlikely to result from a tube rupture where the pressure in the low-pressure side (including upstream and downstream systems) during the tube rupture does not exceed the corrected hydrotest pressure (see 3.1.19 and 4.2.2).

 

How should the including upstream and downstream systems be interpreted? If the LP side design pressure of a S&T exchanger has been increased to same as the HP side design pressure but the connected piping on the LP side design pressure is not increased in line with Section 4.4.14.2.1 requirement, does that mean tube rupture and slow tube leak are still credible scenario?

 

And if these scenarios are to be eliminated then up to what extent of the upstream and downstream piping should the design pressure be increased?

[Bobby Strain]

The statements don't need interpretation.

 

Bobby