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Joints between steel pipe, tubing, or fittings shall be installed in accordance with one of the following methods:
  1. Mechanical joints shall be made with an approved and listed elastomeric gasket.
  2. Threaded joints shall be made with pipe threads that are in accordance with ASME B1.20.1. Thread sealant tape or compound shall be applied only on male threads, and such material shall be of approved types, insoluble in water, and nontoxic.
  3. Welded joints shall be made by electrical arc or oxygen/acetylene method. Joint surfaces shall be cleaned by an approved procedure. Joints shall be welded by an approved filler metal.
  4. Pressed joints shall have an elastomeric o-ring that forms the connection. The pipe or tubing shall be fully inserted into the fitting, and the pipe or tubing marked at the shoulder of the fittings. Pipe or tubing shall be cut square, chamfered, and reamed to full inside diameter. The fitting alignment shall be checked against the mark on the pipe or tubing to ensure the pipe or tubing is fully inserted into the fitting. The joint shall be pressed using the tool recommended by the manufacturer.

Related Code Sections

1211.13 Hydronics, Steel Pipe and Tubing
Joints between steel pipe, tubing, or fittings shall be installed in accordance with one of the following methods: Mechanical joints shall be made ...