I have a 250-gallon tank for my forge, outdoors close behind my shop. State of NM a few years ago declared all buried propane lines have to be plastic or black iron specially wrapped, so my 50-year-old old buried steel pipes from the 500-gallon house tank and from the shop tank to the forge all had to be dug up and replaced. Not much corrosion on the old lines, but some and scary enough that it makes sense. Follow the UPC code if there is one in force in your area or even if there is not-- it's your life and property that are at stake. If you do the plumbing yourself, be SURE the gas line surfaces outside the shop before it enters, so if there is leak in the line twixt the tank and the forge it can not follow the line indoors. Be SURE the reducing valve/pressure gauge at the tank and not downstream by the forge. The plumbing line usually cannot handle full tank pressure. If you use rubber hose for a small barbecue-sized bottle, be sure it is LP-certified and bes sure to use a hefty-enough regulator. Note that the codes and the fire marshal won't allow keeping a tank indoors and usually won't allow pressures going into a building greater than 11 inches of water column, which ain't much, not enough for a forge as a rule. Mine runs around 7 to 15 psi gauge at 7,000 feet.
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