NPT Threaded Full Coupling Introduction

Threaded couping is a common accessory in industrial pipe connection. It is mainly used to connect a short pipe of two pipes. It is a high-pressure pipe accessory formed by forging blank with round steel or steel ingot and then machining thread on lathe. The principle it uses is to clamp both ends of the steel pipe in both ends of the threaded pipe clamp. The advantage of the threaded pipe clamp is that it is easy to use and durable, and it prevents the ends of the pipe from pulling apart very well. Threaded couplings can be divided into full couplings and half  couplings by type, and straight couplings and reducing couplings by shape.

Advantages of Threaded Couplings

• The threaded pipe hoop has high strength and good ductility, which can fully exert the strength and ductility of the steel pipe.

• Connection is convenient, fast, and easy to operate.

• Convenient and intuitive testing.

• Steel pipe threads can be prefabricated, and pipe clamps can be factory produced, which does not occupy the construction period and has high processing efficiency.

• During construction connection, there is no electricity, no gas, no open flame operation, no oil leakage, no pollution, and construction can be carried out around the clock.

• Strong applicability and flexible operation in small and narrow spaces.

• It can connect horizontal, vertical, and oblique steel pipes.

NPT Threads

The thread types of threaded couplings include NPT, PT, BSPP, BSPT, and PF. The full name of NPT is National Pipe Thread, also known as the American National Standard Pipe Thread, which is the technical standard for measuring the threads of threaded pipes and pipe fittings in the United States. NPT threads can be divided into taper thread series and straight thread series based on their purpose. NPT is defined by ANSI/ASME Standard B1.20.1.

Features of NPT Threads:

• The angle between the taper and the central axis of the pipe ≈ 1.7899 ° ≈ 1 ° 47 ′ 24 ″

• The cross-section of the root and crown is flat

• 60 ° thread angle

• Pitch is measured in threads per inch (TPI)

  
  

Dimension of NPT Threads

When identifying or determining thread sizes, the number of threads per inch and the outside diameter of the thread are necessary because there are multiple sizes with the same TPI. Therefore, it is necessary to measure the outer diameter of a pipe or fitting and compare it with a thread size table for identification.