4 replies to this topic

[shvet]

Does anybody apply thermal relief valve (TRV) for vessel and tube overpressure protection? (Not rupture pin valve or fusible plug) anybody met TRV in service or in maintenance? Is it frequent in application? Does anybody have a worth literature about this?

[fallah]

Does anybody apply thermal relief valve (TRV) for vessel and tube overpressure protection?

 

shvet,

 

Yes, if the cause of over pressure would be liquid thermal expansion...

[Linda1978]

If liquid can be trapped in a full liquid system (equipment of pipe) thermal expansion of liquid shall be studied. to protect pipes and equipment usually TRVs are used.

[shvet]

If liquid can be trapped in a full liquid system (equipment of pipe) thermal expansion of liquid shall be studied. to protect pipes and equipment usually TRVs are used.

The sourse of overpressure during liquid thermal expansion is rise of temperature caused heat input. If liquid is heated from for example 0 to 30 °C it is the same case liquid is heated from 100 to 130 °C. In this case it means TRV has to be conventional PSV with set pressure = design pressure of pipe.

 

I'm talking about special products - for example overpressure of vessel with vapor (no liquid). It's not effective to apply conventional PSV because of overheating and gaskets rupture.

[shvet]

I would like to define about TRV. TRV means "Temperature-Actuated PRV". Examples 1 and 2 (sh. 3-2).

 

Can anybody share some experience about this question?