April 2020

Process Engineering

Solve PRV and piping capacity problems—Part 2

Engineers often uncover problems or inadequacies with pressure relief valve (PRV) and relief system piping capacities that need creative and cost-effective solutions.

Engineers often uncover problems or inadequacies with pressure relief valve (PRV) and relief system piping capacities that need creative and cost-effective solutions. These problems may surface in a number of ways. For example, when attempting to close a hazardous operations (HAZOP) review recommendation, it may be discovered that the PRV capacity is inadequate. A debottlenecking study may reveal that a PRV is too small or that backpressure is excessive at increased production rates. When updating process safety information, calculations for an installed PRV may indicate that PRV inlet piping pressure drop exceeds the 3% rule. Resolving inadequacies in pressure relief systems must be addres

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