Leakage rates for valves
Leakage rates for valves
(OP)
Hi there.
I have a question regarding the admissible values for leakage rates during a tightness pressure test.
I was given the rates for internal leakages in valves for sea water based on the DN as:
DN litres/h
6 0.05
8 0.08
10 0.08
15 0.15
20 0.2
25 0.32
I wonder if there is any standard or best engineering practice where I could find if the above values are correct.
Thank you very much in advance.
Jaime
I have a question regarding the admissible values for leakage rates during a tightness pressure test.
I was given the rates for internal leakages in valves for sea water based on the DN as:
DN litres/h
6 0.05
8 0.08
10 0.08
15 0.15
20 0.2
25 0.32
I wonder if there is any standard or best engineering practice where I could find if the above values are correct.
Thank you very much in advance.
Jaime





RE: Leakage rates for valves
RE: Leakage rates for valves
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RE: Leakage rates for valves
The valve is a ball valve.
The seal is metal.
Thank you for your help
Jaime
RE: Leakage rates for valves
It's an old trick by valve manufacturers, old as slice bread.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Leakage rates for valves
Jaime
RE: Leakage rates for valves
The tube (and the rest of air volume) can accept a little (0,4% of the volume, for 4 cm of water) more leaking air until it starts to bubble, but if the valve is leaking, then it will bubble with the same rate as it would, without the glass of water.
Do I miss something?