SY/T 10044-2002Sizing, selection and installation of pressure-relieving devices in refineries (English PDF)

National Standard of the People's Republic of China

ICS

75.020

Classification

E09

Contents

• 1 Introduction
• 1.1 Scope
• 1.2 Definition of terms
• 1.2.1 Pressure relief devices
• 1.2.2 Dimensional characteristics of pressure relief devices
• 1.2.3 Operational characteristics
• 1.2.3.1 System pressures
• 2 Inlet piping to pressure relief devices
• 2.1 General requirements
• 2.1.1 Flow and stress considerations
• 2.1.2 Vibration considerations
• 2.2 Pressure-drop limitations and piping configurations
• 2.2.1 Pressure loss at the pressure relief valve inlet
• 2.2.2 Size and length of inlet piping to pressure relief valves
• 2.2.3 Remote sensing for pilot-operated pressure relief valves
• 2.2.4 Configuration of inlet piping for pressure relief valves
• 2.3 Inlet stresses that originate from static loads in the discharge piping
• 2.3.1 Thermal stresses
• 2.3.2 Mechanical stresses
• 2.4 Inlet stresses that originate from discharge reaction forces
• 2.4.1 Determining reaction forces in an open discharge system
• 2.4.2 Determining reaction forces in a closed discharge system
• 2.5 Isolation valves in inlet piping
• 2.5.1 General
• 2.5.2 Type of rupture disks
• 2.5.3 Application of rupture disks
• 2.5.4 Terminology for rupture disk device
• 2.6 Rupture disk devices in combination with pressure relief valves
• 2.6.1 General
• 2.6.2 Rupture disk devices at the inlet of a pressure relief valve
• 2.6.3 Rupture disk devices at the outlet of a pressure relief valve
• 2.7 Process laterals connected to inlet piping of pressure relief valves
• 2.8 Turbulence in pressure relief device inlets
• 3 Discharge piping from pressure relief devices
• 3.1 General requirements
• 3.2 Safe disposal of relieving fluids
• 3.3 Back pressure limitations and sizing of pipe
• 3.3.1 General
• 3.3.2 Effect of fire on the wetted surface of a vessel
• 3.3.3 Effect of fire on the unwetted surface of a vessel
• 3.4 Considerations for pilot-operated pressure relief valves
• 3.5 Stresses that originate from discharge piping
• 3.6 Isolation valves in the discharge piping
• 4 Isolation valves in pressure relief piping
• 4.1 Determination of relief requirements
• 4.2 Relieving pressure
• 4.2.1 General
• 4.2.2 Operation contingencies
• 4.2.3 Fire contingencies
• 4.2.4 Steam service
• 4.3 Sizing for gas or vapor relief
• 4.3.1 Critical flow behavior
• 4.3.2 Sizing for critical flow
• 4.3.3 Sizing for subcritical flow: gas or vapor other than steam
• 4.3.4 Alternate sizing procedure for subcritical flow
• 4.4 Examples of isolation valve installations
• 4.4.1 General
• 4.4.2 Example
• 4.5 Sizing for liquid relief: relief valves requiring liquid capacity certification
• 4.5.1 General
• 4.5.2 Example
• 4.6 Sizing for liquid relief: relief valves not requiring liquid capacity certification
• 4.7 Sizing for two-phase liquid/vapor relief
• 4.8 Sizing for rupture disk devices
• 4.8.1 Rupture disk devices used independently
• 4.8.2 Rupture disk devices used in combination with pressure relief valves
• 5 Bonnet or pilot vent piping
• 5.1 Conventional pressure relief valves
• 5.2 Balanced bellows pressure relief valves
• 5.3 Balanced piston pressure relief valve
• 5.4 Pilot-operated pressure relief valves
• 6 Drain piping
• 6.1 Installation conditions that require drain piping
• 6.2 Safe practice for installation of drain piping
• 7 Pressure relief device location and position
• 7.1 Inspection and maintenance
• 7.2 Proximity to pressure source
• 7.3 Proximity to other equipment
• 7.3.1 Reducing stations
• 7.3.2 Orifice plates and flow nozzles
• 7.3.3 Other valves and fittings
• 7.4 Mounting position
• 7.5 Test or lifting levers
• 7.6 Heat tracing and insulation
• 8 Bolting and gasketing
• 8.1 Care in installation
• 8.2 Proper gasketing and bolting for service requirements
• 9 Multiple pressure relief valves with staggered settings