What Are The American Standard NPT Threads Used for IMC And RSC Pipes

American standard NPT thread is the abbreviation for National (American) Pipe Thread, which is the American standard for pipe threads. It belongs to the 60 degree cone pipe thread of the American standard. The following is a detailed analysis of American standard NPT threads:

1、 Basic Information

Property: American standard 60 degree cone pipe thread

Classification: Divided into cylindrical pipe threads and conical pipe threads

Application: Widely used for pipeline connections in North America, especially in the fields of petrochemicals, electricity, metallurgy, pharmaceuticals, etc

2、 Thread parameters

The parameters of NPT threads vary depending on the size of the pipeline, including the size of the pipe (inches), the number of unit ridges (TPI or pitch), the external diameter (OD, inches), etc. Here are some common sizes of NPT thread parameter examples:

Please note that these parameters are for reference only. In actual use, relevant standards or manuals should be consulted according to specific needs.

3、 Characteristics and Applications

Sealing: NPT thread design has a taper, forming a seal through tight fit between threads, suitable for pipeline connections that require sealing.

Connection strength: Due to the taper design, NPT threads can generate a significant radial force during connection, improving the strength and stability of the connection.

Adaptability: NPT threads can adapt to pipeline connection requirements of different materials and pressures, and are widely used in fields such as petrochemicals, power, metallurgy, pharmaceuticals, etc.

4、 Difference from other thread standards

Difference from NPS: NPT is a tapered pipe thread, while NPS (National Pipe Straight) is a straight pipe thread, and the two cannot be interchanged.

The difference between NPT thread and ISO thread: The profile angle of NPT thread is 60 degrees, while the profile angle of ISO 7/1 thread is 55 degrees, and the pitch, thread shape, and other parameters of the two are also different, so they should not be mixed.

5、 Precautions

When selecting NPT threads, relevant standards or manuals should be consulted based on actual needs and pipeline dimensions to ensure that the selected thread parameters meet the requirements.

When installing NPT threaded joints, attention should be paid to the rotation direction and tightening torque of the threads to avoid leakage or damage caused by improper installation.

In pipeline systems using NPT threaded connections, the threaded joints should be regularly inspected and maintained to ensure their sealing and connection strength.