NB Part 4 (2021) recognizes RVs venting to a header/manifold and the need for an intervening stop valve

By /

In the 2021 revisions to the National Board Part 4 – Pressure Relief Devices, the code formally recognizes the need for an “intervening valve” on the discharge side of a relief valve.  The code, section 2.5.6 allows this in the following manner:

Membership Required

You must be a member to access this content.

View Membership Levels

Already a member? Log in here

Related Posts

OSHA Q&A on PSM Compliance (CPL02-02-045, 1994)

Clarifications and Interpretations of the PSM Standard The guidance contained in this appendix is provided for compliance assistance. This appendix contains clarifications agreed to in…

Scroll to Top