Posted by Roger Tomfohrde on February 05, 2019 at 15:30:10 from (167.177.39.8):
In Reply to: Gas line measurement posted by 2510Paul on February 05, 2019 at 09:06:25:
OK tell me if I am correct. The 1/2 inch line comes from the meter 68 feet to the manifold by the furnace where there is a pressure regulator. If I am correct there could be 2 psi to the regulator by the furnace and then drop down to 16 inches or a tad less for the equipment serviced by the regulator. Most furnace gas valves will lock out over 16. Two psi on 1/2 inch line is good for 290 k btu on 60 feet..Even so the line should have been up sized. Two things I see in your pictures, One is there is no grounding conductor on the line(Lightning prevention) and yellow csst is not approved for direct burial, they make a product for that. Easiest thing to do here is to get a gauge and check pressure of the line before and after the last regulator which will tell you what you really have. The second thing to do is to clock the meter with a watch and see how many units you are using. There is you tube videos on how to do it and my book is 40 miles away right now. I used to carry fittings to be able to do this. The best story I have is some one changed a gas line on a furnace and then said our piping was too small. Well I found they had a flap of plastic on the inlet of the black iron elbow still there blocking the flow of gas.
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