What Is Threaded Pipe Fittings And How to Make Threaded Pipe Connections

by | May 11, 2022 | Industry Knowledge

Threaded fittings are threaded fittings. Threaded fittings are fittings that are connected to a pipe by internal or external threads and are in most cases no more than 4 inches in size. Commonly used in water gas pipes, small diameter water pipes, compressed air pipes and low pressure steam pipes, etc. A pipeline is formed by connecting with a threaded pipe end. It is possible to seal the thread with adhesive (such as thick white paint, lead monoxide glycerin glue, etc.).

Threaded Fittings Catalog:

Internal teeth, external teeth, live joints, elbows (elbow), tees, crosses (crossheads) and reducers
Galvanized pipe fitting suppliers will share with you the manufacturing standards and production materials of threaded pipe fittings.
Manufacturing standard: GB/T 14383, ASME B16.11, BS 3799, MSS SP 83
Production material:

  1. Cast steel pipe fittings
  2. Cast iron pipe fittings
  3. Stainless steel pipe fittings
  4. Plastic pipe fittings
  5. pvc pipe fittings
  6. Rubber fittings
  7. Graphite pipe fittings
  8. Forged steel fittings
  9. PPR pipe fittings,
  10. alloy pipe fittings
  11. PE pipe fittings
  12. ABS pipe fittings

How to Make Threaded Pipe Connections

A tapered thread exists on many types of pipe threads, including black, galvanized, and PVC. This means that the thread is smaller at the end and gradually becomes larger as it ascends the pipe. The connection tightens as the fitting travels up the thread, but it is not liquid-tight. Thread sealants are used to get a liquid-tight connection. Use pipe dope, also known as Teflon tape, to fill the spaces between the threads before tightening. Wrap the Teflon tape clockwise 2-3 times to achieve a sealed connection. Teflon tape does not have any adhesion so be sure to wrap the tape tightly to form a solid seal.

When using liquid thread sealant, brush the sealant all the way around the thread. The sealant will dry over time and slightly expand to create an airtight seal between the pipe and the fitting. You should apply teflon tape first, followed by liquid thread sealant when you use teflon tape and liquid thread sealant together. Using wicking string and liquid pipe sealant works on older pipes with unreliable threads. Apply the liquid thread sealant and then insert the wicking string clockwise into the spaces between the threads. When the connection made and liquid touches the wicking, the string will expand slightly creating a seal. After the desired sealant applied, hand tighten the fitting onto the pipe. Then, tighten the fitting with a pipe wrench until it’s very tight, ensuring not to overtighten and risk cracking the pipe.

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