Antistatic Test at 100V on Ball Valve

[Momark]

Good morning,
can someone help us about how to perform Antistatic Test at 100 V d.c. on Ball Valves? Normally, this test is performed using a power source not exceeding 12 V d.c. but in this case the power source is to be 100 V d.c.
Alternatively, our client asks to perform the same test on a test sample. How to perform this test also in a safe condition?
Many Thanks in advance for your prompt reply.

Marco

 

[hacksaw]

all depends on the valve design details, and electrical grounding.

 

[bcd]

The requirement seems wrong. Normal requirement is check that a valve to has static grounding between the body, stem, and ball. Thus only 12 Vdc is used.

100 Vdc test is normally done for shoes and other type of insulation to prove it does not conduct static electricity. I cannot think for any reason why someone would want to check that there cannot be any electrical flow path between a ball, stem, and body. There are pretty tight metal-to-metal clearances in the assembly where arcs will most likely occur.

The requirement just does not make sense.

 

[gerhardl]

European standards helpful?

https://www.eurolab.com.tr/en/testler/elektriksel-guvenlik-testleri/antistatik-testler

 

[bcd]

I think I figured this out. Do you have a PFA or FEP lined ball valve? If so, the 100 VDC test is done to check for pin holes, cracks, or porosity in the lining material. Its called a spark test. Refer to standard ISO 19240. If it is not a lined valve, then the 100 VDC test does not apply.