I'm currently doing a case study to find out the exact volume of helium gas required for FE tests on ball valves regards to the valves' volume and pressure class and the number of helium tanks needed for it (assuming the test is being done at room temperature)
The specifications of helium gas that is being supplied to the test bench is as follow :
Size: X50S Pressure: 200B
- The gas capacity (with regards to the Helium Gas) 8.57NM3
- The water capacity. 50L
- The dimension of the cylinder tank .1,51M height
- The weight of the cylinder tank (with and without the Helium Gas) Net fill weight 1.51KG. Gross weight vary.
- The maximum pressure in which the tank can be operated. Max working pressure 200 Bar
- The valve outlet. BS3 Brass
Therefore my question is can the gas law be used to find the volume of helium gas needed for the tests and what are the variables that is needed in finding the volume?
ex: P1 = Valve Maximum Pressure, P2 = Helium Cylinder Tank Pressure, V1 = Valve Internal Volume (has been calculated), V2 = Volume of Helium Gas Needed (required) Standards for the FE test are:
- ISO 15848 Part 1
- Shell SPE 77/312
In simple term, I would like to know what is the volume of helium gas needed to pressurize the valve to reach a certain test pressure? Given that, the helium cylinder tank has a max working pressure of 200 Bar and a volume of 8.57Nm3. So how much helium gas is needed from this cylinder to pressurize a valve with an internal volume (ex : 0.91594m3) to a test pressure of 19.6 Bar