according to api520, asme viii, iso4126,gb567 and gb38599,the pressure in the cavity is either monitored and/or vented to atmosphere. this is commonly achieved through the use of a so-called tell-tale assembly consisting of pressure gauge or indicator, excessive flow valve and free vent.
use of rupture disc in combination with safety relief valve
• prevent leakage through the relief valve
• prevent corrosion of the relief valve internals
• the use of “standard” material relief valves and related spare parts, resulting in substantial cost savings at the initial investment and spares
• extend the service life of safety relief valves