Is there an effective test method for a large HDPE pond liner?
Is there an effective test method for a large HDPE pond liner?
(OP)
I am looking at a repairing a defective evaporation pond liner which is made up of 2 layers of HDPE with a proprietary drainage membrane between them. The top layer is damaged and we have a contractor in place ready to remove and replace this. The scope of works calls for the bottom liner to be visually inspected but I feel defects and damage could be near impossible to spot with the naked eye. A vacuum box test only does where it touches and is usually limited to the welds. I understand that a holiday test won't work as the bottom liner is on the ground and the test will short out. Is there another test I can do on the entire liner (approximately 35,000 sq m)?
On a slightly different tack, we have found water between the HDPE liners on the outside of the pond berm. The pond is 225m x 150m and the water is usually 1.5 m deep, the berm is 2.5m high. I would have thought that any water between the liners would not have gone much above the pond water level. An office wag has ventured that the water in the pond must have pressurized the water between the liners and forced it over the top of the berm. Is that possible?
On a slightly different tack, we have found water between the HDPE liners on the outside of the pond berm. The pond is 225m x 150m and the water is usually 1.5 m deep, the berm is 2.5m high. I would have thought that any water between the liners would not have gone much above the pond water level. An office wag has ventured that the water in the pond must have pressurized the water between the liners and forced it over the top of the berm. Is that possible?





RE: Is there an effective test method for a large HDPE pond liner?
RE: Is there an effective test method for a large HDPE pond liner?
http://www.clu-in.org/products/intern/leaklnfl.htm
RE: Is there an effective test method for a large HDPE pond liner?
Apologies, I should have chosen my words a bit better and used grounded rather than shorted. The contractor is saying they can't perform a holiday test on the bottom liner because it is contact with the ground. It is in effect earthed and they can't get the current to pass through it.
Bimr
Thanks for the info.
RE: Is there an effective test method for a large HDPE pond liner?
RE: Is there an effective test method for a large HDPE pond liner?
Eng Tips Rocks
thanks,
kk
http://cubuilt.com
RE: Is there an effective test method for a large HDPE pond liner?
RE: Is there an effective test method for a large HDPE pond liner?
The space is not subject to the limitations of static head.
RE: Is there an effective test method for a large HDPE pond liner?
Ron - Thanks for the input. Met with the contractor this morning and he is does not think he will get a return signal through the soil and will not attempt a trail, so the holiday test is out and we are inspecting visually . . . marvelous.