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In This Chapter
-
Relief valves: determination of Required Capacity
- Introduction
- Applicable Codes and Standards
- ASME Codes
- Excerpts from ASME Code Section I for Power Boilers
- NB-7141 Pressure Relief Devices
- API Standards and Recommended Practices
- ISO Standards
- NFPA Codes
- OSHA Codes
- Causes of Overpressure
- Fire Protection
- Gas-Filled Tanks
- Low Liquid Inventory Tanks
- Heat Absorption across Wetted Surfaces
- API Recommendation
- NFPA Recommendations
- Low-Pressure Tanks
- Free Air Calculation
- Wetted Area (A)
- Tank Shape
- Fire Zone
- Fire Height
- Vertical Tanks
- Horizontal Tanks
- Environmental Factors
- Calculating the Relieving Capacity
- Protecting Liquid-Full Tanks
- Nonfire Protection Overpressure
- Process Equipment Considerations
- Low-pressure Storage Tanks
- Heat Exchangers
- Pumps and Compressors
- Distillation Towers
- Pipe Headers
- Liquid Pipelines
- Gas Pipelines
- Chemical Reactors
- Nuclear Reactors
- Discharging the PRVs
- Discharging to Closed Locations
- Substituting for Pressure Relief Devices
- Conclusions
- Specification Form
- Bibliography
Abstract
Protection against overpressure is one of the most important design tasks in the chemical, petrochemical, oil, and gas industries. The various causes of overpressure fall into two broad categories: fire conditions and process conditions. The purpose of overpressure protection systems is to reduce or eliminate the potential for overpressure-initiated explosions and fires.
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