Nominal Pipe Size Definition And Calculation Of Data

Table of Contents

Nominal Pipe Size is one of the core definitions of modern pipe engineering and infrastructure, which has a very important status and significance. It is widely used in the engineering field, and the specifications and dimensions of the pipelines used in each project are inseparable from nominal pipe size chart.

Nominal Pipe Size

Nominal Pipe Size Definition

What is nominal pipe size? Nominal pipe sizes refers to a standardized representation of the nominal pipe size, usually in inches.

International organizations in various countries and regions have developed different series of standards. 

For example, in the United States, ASTM, ANSI, and ASME standards for nominal pipe sizes, which apply to industrial pipes, can also be applied to piping systems in construction and municipal engineering.

Nominal Pipe Size Classification

Nominal Pipe Size Several common classifications are:

  • Standard NPS: Sizes range from 1/8 “to 60”. The most common.
  • Small caliber NPS: Sizes ranging from 1/8 “to 4”. They are generally suitable for low pressure fluid transport as well as general industrial applications.
  • Large caliber NPS: Sizes cover pipe sizes up to 4 inches. It is generally suitable for high-pressure fluid transport and large industrial applications.
Nominal Pipe Size

Nominal Pipe Size Data Interpretation

Nominal Pipe Size Data Sources

The International Organization for Standards (ISO) and other national organizations have developed standards for NPS. Examples include ISO 6708, ANSI B36.10 and ANSI B36.19.

On the other hand, computational and modeling simulation software can design more accurate and appropriate NPS pipelines based on factors such as fluid properties and pressure.

The following table is about the NPS and pipe specification parameters, I hope it can provide you with help and reference.

 

Nominal Pipe Size (NPS)

Outside Diameter (inches)

Outside Diameter (millimeters)

Wall Thickness (inches)

Wall Thickness (millimeters)

Nominal Pipe Size (DN)

1/8

0.405

10.29

0.049

1.24

6

1/4

0.54

13.72

0.065

1.65

8

3/8

0.675

17.15

0.065

1.65

10

1/2

0.84

21.34

0.065

1.65

15

3/4

1.05

26.67

0.065

1.65

20

1

1.315

33.4

0.065

1.65

25

1 1/4

1.66

42.16

0.065

1.65

32

1 1/2

1.9

48.26

0.065

1.65

40

2

2.375

60.33

0.065

1.65

50

2 1/2

2.875

73.03

0.083

2.11

65

3

3.5

88.9

0.083

2.11

80

3 1/2

4

101.6

0.083

2.11

90

4

4.5

114.3

0.083

2.11

100

5

5.563

141.3

0.109

2.77

125

6

6.625

168.28

0.109

2.77

150

8

8.625

219.08

0.109

2.77

200

10

10.75

273.05

0.134

3.4

250

12

12.75

323.85

0.156

3.96

300

Nominal Pipe Size Data Calculation

NPS is determined by the internal diameter of the pipe. More precisely, NPS is associated with an approximation of the pipe’s inner diameter, not the exact outer diameter and wall thickness.

The calculation method of NPS can be calculated by the inner diameter:

Inside diameter =NPS x 25.4−2 x wall thickness

Get the inner diameter of the pipeline, you can calculate the outer diameter of the pipeline:

Outside diameter = inside diameter +2 x wall thickness

Through reasonable NPS data calculation, it can help engineers and pipe manufacturers choose the right pipe size, and then achieve the perfect effect of the project.

Nominal Pipe Size Conclusion

NPS plays a crucial role in the design and application of the pipe. The continuous development of new nps dimensions and calculation methods can promote the continuous progress and development in the field of pipeline engineering.

      FAQs:

1. How to find the inside diameter of a pipe?

This can be calculated using standard measurement formulas by looking at the pipe specification table.

If you have actual pipe samples, you can use a tape measure or vernier caliper for direct measurement.

2. Why is pipe called Schedule 40?

In the early days, the wall thickness and pressure rating of the pipe were named according to the schedule of the pipe, and the schedule. And 40 represents the wall thickness and pressure level of the pipe. Therefore, the wall thickness and material of the pipe on Schedule 40 meet the standard requirements of this grade.

Related Products

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

CONTACT US