Outdoor Kitchen Island, Final Natural Gas Burner Setup

Finally settled on a #55 drill bit (0.052" or 1.3mm) for the orifice in the larger (semi-rapid) burner.

Started out with a #60 bit (0.040" or 1mm) in the orifice that I had drilled initially. That took 11m 20s to boil a quart of water. Boil times dropped to 7m 30s with a #56 bit (0.0465") and was unable to improve the time with 1.2mm, 1.25mm and finally #55 drill bits.

This finally got me thinking that something else was going on and so I clocked the gas meter and found I was only getting 7.5 CFH of gas flow which is about 7650 BTU/hr. compared to the 9700 BTU/hr. calculated by the orifice diameter and gas pressure (7.5in.wc).

It seems that the 4mm OD copper tube between the valve and burner is the source of the gas flow restriction. While it flows plenty of propane (LPG) for an even hotter flame, with the reduced pressure and the need to flow 2.5 times as much volume of gas, that small tube is not up to the task.

More to come, the search for a larger tube...

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Intro/Outro:
Louisiana Fairytale by Austin Rogers
https://web.archive.org/web/20170402222425/http://drfiddle.com/show_tune.php?id=94