How to determine voltage for Holiday Test
How to determine voltage for Holiday Test
(OP)
Hi Everybody
I want to know how to determine the voltage for Holiday test in Underground Pipes. Is It related to pipe thickness or Polyethylene coating thickness? How does it relate?
Thank you in advance.
I want to know how to determine the voltage for Holiday test in Underground Pipes. Is It related to pipe thickness or Polyethylene coating thickness? How does it relate?
Thank you in advance.





RE: How to determine voltage for Holiday Test
RE: How to determine voltage for Holiday Test
Dry film Mils Voltage
8 to 11 1,700
12 to 15 2,200
16 to 20 2,700
21 to 40 3,200
41 to 55 4,200
You first need to find out what the min required thickness is and set your Holiday tester accordingly. Note that Holiday is a destructive test. Do not keep going over the same area or your coating will be ruined. Also as mentioned by Stanweld you should always find out from the coating supplier what the specific voltage requirements for their product is. This only gets you in the ballpark.
RE: How to determine voltage for Holiday Test
Now, make a very small pinhole in a untested area of the mock-up with the heaviest acceptable coating, and drop you voltage to about 500V per mil, and keep raising the voltage until you get the first indication of sparking/'jeeping'. This is the minimum, acceptable testing voltage.
Pick a standardized test voltage somewhere between the minimum found and 75% of the 'breakdown' voltage. Rules-of-thumb are only starting points. Don't use them without experimental testing on the actual 'stuff', either by the manufacturer or by you.
RE: How to determine voltage for Holiday Test
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