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In a typical gas line installation, Teflon tape or pipe joint compound should always be used on the threads to ensure there are no leaks. If using a pipe thread sealant tape, wrap it around the threads and insert into the fitting.
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You should never use teflon tape/paste on AN fittings - the seal is made on the 37* face, not the threads. Pipe threads are a different story - those use tapered threads to make the seal (which isn't a very good seal BTW), so those damn near require teflon tape/paste to make sure the seal is reliable.
Coat threads with pipe thread compound or gas-rated Teflon tape before assembling. Align the copper tubing so the flare fits perfectly before threading on the flare nut. Tighten the nut with an adjustable or open-end wrench.
Wrap Teflon tape clockwise around the threads at the end of the pipe. Seal the threads with 2-3 wraps of teflon tape before you attach any connectors or fittings. This will ensure a tight, well-sealed connection. You can also use a liquid pipe thread compound instead of Teflon tape to create a strong seal.
1) BSP (British Standard Pipe) BSP threads are the most common and can be used for gas and water. The sizes are imperial. To get a 100% seal with gas you use a yellow thread or Liquid thread seal.
Thread seal tape (often mistakenly referred to as Teflon® tape) that is white in color is not recommended as a joining compound for steel gas piping. Cutting oils that remain on the pipe threads from manufacture may prevent the tape from sealing. In some areas, yellow thread seal tape is allowed. Pipe dope is preferred and may be all that is allowed.
The American Society of Testing and Materials (ASTM) dictates that all threaded pipe joints should use a pipe sealant. Teflon tape is the most common pipe sealants. It’s used on all types of threaded pipe connections and comes in a variety of colors each meant for a different purpose.
What do you use to seal gas pipe threads? Remember to apply pipe thread compound or gas-rated Teflon tape to the threads on threaded connections before assembling them. Flare joints rely on a tight fit to seal and don’t require additional sealant.
Use gas-rated teflon tape (yellow up to 1/2", red for 1/2" and up), which is thicker than water-duty (white) teflon tape (color refers to the spool, not the tape itself).