Rupture disk pressure rating under relief 1

[twoplates]

If installing a RD below relief valve, does the pressure setting have to be below the PSV, or just below the MAWP of the vessel being protected?

Or should it be slightly higher to prevent premature rupture and possible contamination/damage to PSV?

 

[BenThayer]

check out Fike's info regarding the use of PSD and PSV combinations.

EDIT: copy the entire address and paste it. the link doesn't work...

http://www.fike.com/documents/presrel/adrd/technical_bulletins/TB8105

Best Practices for RD_PRV.pdf

the excess flow valve to allow small leaks to escape or the use of a pressure switch between the PSD and PSV are not uncommon depending on the gas and service.