The minimum discharge area of a pilot operated relief safety valve in a liquid system can be calculated as
A = q SG1/2 / (36.81 Kvisc dp1/2) (1)
A = discharge area (Square Inches)
q = relieving capacity (Gallons per Minute)
SG = Specific Gravity of the fluid
Kvisc = correction factor due to velocity - 1.0 for most water systems
dp = differential pressure - set pressure (psig) + over pressure (psig) - back pressure (psig)
Sizing and dimensions of control valves & equipment in steam and condensate systems.
Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.
An overview of the American Petroleum Institute - API - valve standards.
An overview of BSi - British Standard institute valve standards.
An overview of DIN - Deutsches Institut für Normung - valve standards.
Factors of Safety - FOS - are important in engineering designs.
Safety valves with boilers ranging 275 to 1500 kW.
Sizing safety valves according boiler output power in high pressure systems (kW and Btu/hr)
Sizing safety valves after boiler output power in low pressure systems (kW and Btu/hr).
Calculate length of safety valves vent pipes.
Maximum safety valve free air relief capacity.
American National Standards Institutes schedule for safety colors marking physical hazards.
The most common used safety valve standards in Germany, UK, USA, France, Japan, Australia and Europe.
Calculating relief valves in gas and vapor systems.
Calculate safety valves in saturated steam systems
Calculate spring operated relief valves in liquid systems.
Guidelines to safety steam valves installation.