pescador775
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OK, I understand the original orifice was very small; must be a 100 + psi regulator. The reasoning is good and should work fine. So, that is not the problem. Temp differences can affect cal accuracy but I doubt that is the case here. Bear in mind that the filters and coalescers must be purged before a good reading can be made at the output. That should take only a couple minutes at most. At this point, I don't know what is going on. However, one should assume that the problem is originating with the changes to the system, and that is the stik. Three or four of the steel pads will mix anything you got and not cause much resistance. If the pads don't fit tightly to the sides it may be necessary to stretch the pads a bit. The gases have to be "entrained" and I don't see it happening with a 3 inch pipe. I'm thinking that a 2.5 X 24 inch pipe should do the job.