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Posted by Dan on October 22, 2002 at 19:04:39:
In Reply to: Re: Minimum Gas Pressure at the Burner posted by Rod Nissen on July 02, 2002 at 08:12:59:
If you have 5.2 " w.c. at high fire and assuming is 100% gas flow for your 200HP boiler and your low fire reading is .2 " w.c., that is .2" w.c. is about 3.8% of 5.2 "w.c. Take the sqaure root of 3.8 % X ten and that will give you about 19.5% gas Flow input. you are about 20% of your firing rate at lowfire you should be at 10% gas Flow for a nice 10/1 turndown. I don't know what kind of burner you have and you may not be able to get a 10/1. Pressure and Flow is not linear but square root extracted. 1.3 "w.c, which is 25% of 5.2" w.c. is 50% gas input(100HP) and 2.6" w.c. is 50% of 5.2" w.c. which is 70% gas flow for your boiler.