Kiln Test

I've got the kiln set up, and firing, with a 4, 6 and 10 cone inside. I don't have any of those brick plugs for the peep holes, and I'm just using one burner. I guess I'll let it run 3 hours, and see if any cones melt.
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I test fired the kiln for 8 hours, and it never reached cone 4. My plan is to replace what seems to be a leaky ball valve, put a smaller orifice in the front burner, and test it again on Sunday, with a lower range of cones. I'm also going to order a digital pyrometer that goes to 2500 degrees F.
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I may not have enough gas pressure to use the rear burner. I did replace the front nozzle with a smaller one and also replaced the ball valve and it does seem to be firing hotter. I'll shut it off after eight hours and see if any pyrometric cones have melted.
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I test fired it for 10 hours on Sunday, with a wide range of cones set up inside. I adjusted the burner, and allowed more air in, and got a roaring blue flame. It did get much hotter, with the interior glowing red. I won't be able to open the kiln until tomorrow, and get a read of the maximum temperature.

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Back to the drawing board, no cones melted.
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The goal for today, is to test the gas pressure at the meter, and also at the outlet near the shed. I need a minimum 6 water-column inches of pressure. Playing with gas is always risky, so I'll be extra careful.
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The gas pressure at the shed outlet is 7-1/2 imches of water, which should be fine. I don't even need to test at the meter. The next thing is to order a pyrometer.