A pressure relief device is a critical safety component installed on product collection tanks and other pressurized vessels. Its primary function is to automatically open and discharge fluid (gas or liquid) when the internal pressure exceeds a predetermined set point, thereby preventing catastrophic failure, tank rupture, or explosion. It ensures operational safety by maintaining system pressure within safe design limits. The device typically contains a spring-loaded mechanism or a rupture disc calibrated to a specific pressure. Under normal operating conditions, the device remains sealed. When internal pressure rises and overcomes the spring force or disc burst rating, the valve opens or the disc ruptures, creating a flow path to vent the excess pressure to a safe location. Once pressure returns to a safe level below the reseat pressure, spring-loaded valves close automatically, while rupture discs require replacement. Materials on file include stainless steel, carbon steel, and elastomer seals. Key parameters include operating pressure (1.0–1.6 MPa), set pressure range (0.1–10 MPa, API 520), relieving capacity (500–5000 kg/h, ISO 4126), operating temperature (-40 to 200 °C, ASME B16.34), accuracy (±5% of set pressure, API 520), leakage rate (≤0.5 mL/min at 90% of set pressure), connection size (DN15–DN200, DIN EN 1092-1), body material (WCB/CF8/CF8M, ASTM A216/A351), seat material (PTFE/PEEK, ASTM D4894), weight (5–150 kg), IP rating (IP65, IEC 60529), and response time (≤0.1 s, ISO 4126). These values are directory reference ranges and must be confirmed for the actual model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.
The device typically contains a spring-loaded mechanism or a rupture disc calibrated to a specific pressure. Under normal operating conditions, the device remains sealed. When internal pressure rises and overcomes the spring force or disc burst rating, the valve opens or the disc ruptures, creating a flow path to vent the excess pressure to a safe location. Once pressure returns to a safe level below the reseat pressure, spring-loaded valves close automatically, while rupture discs require replacement.
