Hi All,
The supplemental PSV as discussed in API 520 Part 1) set pressure can be at 110% of MAWP. Essentially this is for fire case in addition of devices (set pressure at 100% MAWP) sized for non-fire cases.
I'm working with a company where a single PSV set pressure is at 110% MAWP (there is no other PSV).
My question is: is it possible to have one supplemental PSV without the primary PSV? Any possibilities of this happening, guys?
e.g.
Design Pressure = MAWP = 10.2 MPag
PSV set pressure = 11.22 MPag