Discharge of PSV/PRV

[rathore_mbm2002]

Is it necessary to vent a balance bellows type PSV/ PRV always to the atmosphere ?

Can't the discharge be sent to a tank or line instead ?

Vent pipe of PSV/PRV if diverted to tank then very purpose of valve will be defeated in view of back pressure on PSV. But vent can be sent to pipe which in turn connected to flare line open to atmosphere.