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Connection:

NPT

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NPT is an acronym that represents National Pipe Thread. Often, it is also referred to as American National Standard Pipe Thread. These are standards established by the United States used for screw threads designed on pipe and pipe fittings. NPT standard covers both thread and tapered connection and are used for several purposes. To achieve this, there are different types of National Pipe Threads with their unique symbol used for activities. NPT gives an effective sealing for connections to guard against leakages in connection and can be used on any material. Also, the SAE flanges are available for use in different sizes ranging from 1/8” to 8”.

NPT SAE Groove Side
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1. What is NPT ?

Pipes and other flanges are connected using various connection types. Also, different standards specify the dimensions and measurement to be used when building a pipe, valve, etc. one of the common connection types are called NPT. NPT stands for National Pipe Thread. Also, it is known as American National Standard Pipe Thread. NPT can be used both for straight thread and tapered connection. Also, NPT standards are outlined in the ANSI/ASME B1.20.1 standards. The main aim of National Pipe Thread is to calculate tapered threads on pipes and flanges. National Pipe Thread gives a tight and leak-free connection. 

2. What are the dimensions of the National Pipe Thread?

National Pipe Thread is sometimes referred to as MPT, MNPT, FPT, or NPT (F).

 

The table below shows the major dimensions used in the NPT connection:

*** OD: Outer Diameter

3. What are the differences between NPT and BSPP?

NPT and BSPP are common connection types used for pipes and pipe fittings. For a long time, both NPT and BSPP have been adopted for various materials such as stainless steel or carbon steel. As similar as they are, there are major differences between the two which are listed below:

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  • Both connection types have the same peaks and valleys, however, they have different designs. For the NPT, the peaks and valleys have a flat shape, but for BSPP they are round. 

  • The angles of both types also differ. NPT uses an angle of 60 degree while BSPP uses 55 degree.

  • NPT was adopted by the United States as a standard. BSPP is widely accepted for use in many countries of the world.

Using the NPT connection method for pipes is very advantageous. Some of the advantages are listed below:

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  • Widely used for many pipes.

  • Available in various sizes and materials.

  • Provides tight sealing and gives connection needed rigidity.

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