Does anyone know about piping natural/propane gas to a fire?

Why ?

I was curious about that spark back arrestor you mentioned. These weed nozzles draw air in from the rear of the nozzle.
I have used weed torches before. They are very basic.

beep beep

Personally I would suggest hooking customers up with outside vendors for their fire lighting needs.
Too many folks don't have a clue how to light a fire without singed eyebrows,
but they all have the phone number of a personal injury attorney.

You should go with a gas pressure regulator. Normally however with natural gas, in residental, secondary regulators are not installed behind the secondary regulator already installed ahead of the meter. As far as the regulator question , appliance regulators control gas pressure under flow conditions , but under no flow conditions the output pressure will be the same as the input .

Line regulators are positive shut off regulators , When the gas flow is shut off , the output will not climb to match the input , but will remain at the set value . If a line regulator is installed I would always recommend one with an OPD ( over pressure device. )

Connect the left handed framastan to the right handed veeblefitzer. DO NOT use the included doohicky.

ok ill throw in my 2 cents. the only time I have ever seen burnback through a hose is when using an oxy act torch. reason being the fuel side would need oxygen in the line to burn back. as we all know sometimes if you have a leaky seat on your tip, or sometimes get the tip to close the higher pressure oxy can migrate back into the lower pressure gas line. in a regular gas line there is no oxygen in the line to allow it to burn back through the line. so when said line has a leak it will burn outside the pipe when it reaches the oxy in the atmosphere. at work in our core room we have 10 hot box core machines running natural gas. if the operator says hes smelling gas ill look for a large leak visible to the naked eye. if I determine its not a huge leak that's going to cause a massive ball of flame i then grab the lighting wand the operator uses to light the box and start walking the line. ill do you 1 better look up hot tapping or welding a crack on live natural gas lines on google. even when you see tanker truck or tank explosions they burn predictably outside the tank until the heat and pressure causes a rupture.

now that the burnback has been addressed I would be more worried about a hose connection being that close. causing the hose to get soft and separate from the hose fitting. or a coal to come out and burn a hole in the hose. or joe q redneck putting the short line off his gas grill on there with the tank sitting a foot way. while you may never see a full on tank explosion you would probably see lawsuits related more to incidental injury (tripping over the line and landing in hot firepit) or just common stupidity.

Lol that would be 'a second rainy day drain' notjustone

if I were to do the 5 foot pipe I would put a bell reducer on it with a pipe plug drilled out to create an orifice. while the flame will not burn back all the way to the hose it can burn back into a pipe that is wide open like that when it has low fuel pressre or backpressure. an orifice creates an area where if there is some backpressure which forces oxy in it will burn out and starve itself. when you light your torch and don't have enough gas it pops as it burns up air in the line and goes out. but since you don't have your oxy on it just pops starves and goes out good example of what happens when there is air fuel mixture.

I would not call it an air injection hole or some idiot will hook up his compressor wide open, blow embers out all over his family while they were enjoying a pleasant night making smores.

not to mention what happens when john q redneck doesn't pull that pipe after the fire is lit. builds the mother of all fires to impress bobbie jo redneck. after a certain amount of time bobbie jo is impressed. they decide to pull hot pipe and put the contraption away for the night. john burns his hand on hot pipe then sues for lack of spousal attention cause he burnt her favorite fingering finger?

sounds funny but I know a local stihl chainsaw dealer that used to sell log splitters that doesn't anymore after a customer cut his fingers off. so the guy sued the manufacturer and the distributer. the distributer with less money for lawyers ended up wth the claim. pain and suffering, loss of present and predicted future income since customer could no longer type efficiently. and believe it or not alienation of spousal attention (or something like that) because his wife left him while he was out of work.

this is one of them cases where unless you can get ul listing so that your insurance will back you in the event of a claim. it probably wouldn't be worth the profit offset created by the addition of such accessory. just weld in a bung call it a secondary drain in case bottom drain is full of debris and let the customers do the redneck engineering.

ps uber cool would be one full of lava rock for them city dwellers with lack of firewood.