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tell-tale indicator

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used to monitor the space between a rupture disc and safety relief valve or the presence of back pressure in a header system.

tell-tale indicator

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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



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