Pressure Relief Safety Valves课件.pptVIP

Pressure Relief;What is the Hazard?;What are Relief Events?;Potential Lines of Defense;What is a Relief System?;Why Use a Relief System?;Pressure Terminology;Code Requirements;Code Requirements;Relief Design Methodology;Locating Reliefs – Where?;Choosing Relief Types;Spring-Operated Valves;Picture: Conventional Relief Valve;Superimposed Back Pressure;Built-up Back Pressure;Spring-Operated Valves;Picture: Bellows Relief Valve;Pros Cons:Conventional Valve;Pros Cons:Balanced Bellows Valve;Rupture Devices;ConventionalMetal Rupture Disc;ConventionalRupture Pin Device;When to Use a Spring-Operated Valve;When to Use a Rupture Disc/Pin;When to Use Both Types;Relief Event Scenarios;An Example: Batch Reactor;Sizing Reliefs;Scenarios Drive Relief Rates;Overfill Scenario Calcs;Fire Scenario Calcs;Determine Wetted Area;Determine Heat Absorption;Determine Vaporization Rate;Determine Relief Vent Area;Determine Relief Vent Area;Determine Relief Vent Area;A Special Issue: Chatter;Chatter - Principal Causes;Worst Case Event Scenario;Design Relief System;Installation, Inspection, and Maintenance;?? Reduced Inlet Piping;?? Plugged Bellows, Failed Inspection, Maintenance;?? Discharges Pointing Down;?? Long Moment Arm;?? Will these bolts hold in a relief event;Mexico City Disaster;Summary;References;END OF PRESENTATION