Certified Pressure Relief valves
Certified Pressure Relief valves
(OP)
Are relief valves and rupture disks required to be certified / stamped when in hazardous processes?
What can be done to have them certified?
What can be done to have them certified?





RE: Certified Pressure Relief valves
It does not matter whether the process is hazardous or not. It is whether the pressure is over 15 PSIG. Liquids have also been included since 1985.
In Europe (EU Countries) a similar PED - Pressure Equipment Directive is enforced since 1992 for pressures above 0.5 barg. In the main, here one of the Nominated Bodies (Lloyds, DNV etc.), certifies the valve against test data which can also that supplied by the National Board. The valves in these cases are CE marked.
Per ISO, only the term Safety Valve is used regardless of application or design.
RE: Certified Pressure Relief valves
When you say "capacities certified against these code rules by the National Board of Pressure and Vessel Inspectors" do you meen the relief calculation that we engineers do on each valve to ensure they were sized correctly (based on fire,PCV failure, outlet valve closed, inlet/outlet dP check, etc.)?
RE: Certified Pressure Relief valves
Per ISO, only the term Safety Valve is used regardless of application or design.
RE: Certified Pressure Relief valves
How do I ensure the valve is actually certified?
Will the relief valve tag identify certified/non certified? Or is there another designation for that?
Thanks!
RE: Certified Pressure Relief valves
Per ISO, only the term Safety Valve is used regardless of application or design.