November 2008

Special Report: Plant Safety and Environment

What you should know about liquid thermal expansion

Decision flowchart aids in correct thermal relief valve requirements

Norouzi, S., Sazeh Consultants, Engineering and Construction; Rahimi Mofrad, S., Petrofac Engineering & Constructions

Pipe rupture due to thermal expansion of blocked liquid between process valves may cause limiting effects, but it could  produce unacceptable consequences, especially with dangerous liquids. Most references provide proper guidelines regarding thermal expansion relief valve requirements; however, there is no straight forward method to specify when a thermal relief valve (TRV) is required. Furthermore, in the absence of a step-wise approach, sometimes the TRV is provided based on the fluid's volume or nature (hazardous or flammability) while checking thermal expansion's initial requirements has been mistakenly neglected. TRV requirement. Fig. 1 is a simple flowchart representing questio

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