Problems pressure testing PEX for radiant slab

Old 08-24-10, 07:53 PM
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Problems pressure testing PEX for radiant slab

So I'm done with my layout and my concrete guy is coming Thursday. I figured I should pressure test before he comes and have pressure in the lines when he is pouring.

I capped my manifolds and hooked up a Schraeder valve to one end of the supply manifold and pumped in 50 psi of air.

My problem is that I will not be able to tell if my tubing is leaking because my manifold is leaking like a seive. I have two Sioux Chief Branchmaster manifolds with the valves on each drop. The air is rapidly leaking out around/through the valves. I'm maybe losing 1 psi/minute, and I can hear the air coming right out around the valve shut-off lever.

Is this normal? Will the manifolds hold water or will they leak water out around the valves too?

Old 08-25-10, 03:31 AM
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If they leak air, they will leak water. Not at the same rate, but they will leak. I'd check out the connections and any valves/o rings, etc.

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