The correct answers are B, D, and E because these factors directly influence the performance, reliability, and capacity of a Safety Relief Valve (SRV), as emphasized in CCPS Mechanical Integrity and pressure relief system design guidance.
B (inlet and outlet piping design) is critical. Improper inlet piping can cause excessive pressure drop, leading to valve instability or chatter, while poorly designed discharge piping can create backpressure that reduces relieving capacity. CCPS stresses that piping design must meet strict criteria to ensure the valve functions as intended.
D (material of construction) affects the valve’s ability to withstand process conditions such as corrosion, temperature, and chemical compatibility. Incorrect materials can lead to sticking, leakage, or failure to open at the set pressure.
E (boiling point and temperature of contents) are essential for determining the relieving scenario and required capacity . These properties influence whether the relief is vapor, liquid, or two-phase flow, which directly affects sizing and performance.
Option A (toxicity) does not affect the mechanical ability of the valve to relieve pressure—it is relevant for consequence analysis, not valve function. C (wind conditions) impacts dispersion after discharge, not the valve’s ability to provide overpressure protection.
CCPS highlights that proper design, installation, and material selection are crucial to ensure reliable pressure relief performance.
