IS 1239 Steel Pipe

Size Charts

Understanding IS 1239 Pipe Size Charts

Introduction

The IS 1239 standard is a crucial document in the realm of steel pipes, setting forth specifications for various aspects such as dimensions, weights, and properties. These standards are imperative for ensuring the compatibility and reliability of pipes used in a wide range of applications, from plumbing to industrial processes.

Pipe Sizes and Dimensions

IS 1239 defines the nominal bore (NB) of the pipes, which is essentially the inner diameter of the pipe. It specifies a range of nominal bore sizes, typically starting from 15mm NB up to 150mm NB and beyond.

Pipe Wall Thickness

The standard also provides guidelines for the minimum wall thickness of pipes. This is important because it determines the strength and durability of the pipe. The wall thickness may vary based on the nominal bore size and the class of the pipe.

Classes of Pipes

IS 1239 categorizes pipes into three classes based on their wall thickness: Light (Class A), Medium (Class B), and Heavy (Class C). Each class has different wall thicknesses, which are designed to meet various structural and pressure requirements. The class is usually indicated by a letter, such as ‘A,’ ‘B,’ or ‘C,’ followed by the nominal bore size. For example, a pipe with a nominal bore size of 25mm and medium thickness would be referred to as “25NB Class B.”

Tolerance

The standard specifies tolerance limits for various dimensions of the pipes, ensuring that they meet the required specifications and quality standards.

Length of Pipes

IS 1239 also provides guidelines for the standard length of pipes, typically 6 meters or 7 meters. Pipes may also be available in custom lengths as per the customer’s requirements.

Ends

The standard specifies that pipes should have plain ends, unless otherwise specified.

Surface Finish

Depending on the application and whether the pipe is black or galvanized, the surface finish requirements may differ. Black pipes are typically untreated, while galvanized pipes have a zinc coating to prevent corrosion.

Testing and Inspection

IS 1239 outlines the methods and criteria for testing and inspecting the pipes to ensure they meet the required standards and specifications.

Importance of Standardization

Standardization in pipe manufacturing is vital for several reasons. It guarantees uniformity in design, construction, and performance, making it easier to source, install, and maintain pipes. Furthermore, standardized pipes ensure compatibility with various fittings, valves, and other components, simplifying the assembly process.

Application Areas

IS 1239 compliant pipes find widespread use in various industries, including construction, plumbing, water supply, gas pipelines, and more. They are renowned for their reliability, durability, and compatibility with standard fittings.

Table 3 Dimensions and Nominal Mass of Steel Tubes

Table 3 Dimensions and Nominal Mass of Steel Tubes
(Clauses 8.1 and 10.1.1.1)

Nominal Bore	Outside Diameter			Thickness	Mass of Tube
	Maximum	Minimum		Plain End	Screwed and Socketed
mm	mm	mm	mm	mm	mm

6	10.1	9.7	1.8	0.36	0.363
8	13.6	13.2	1.8	0.515	0.519
10	17.1	16.7	1.8	0.67	0.676
15	21.4	21	2	0.947	0.956
20	26.9	26.4	2.3	1.38	1.39
25	33.8	33.2	2.6	1.98	2
32	42.5	41.9	2.6	2.54	2.57
40	48.4	47.8	2.9	3.23	3.27
50	60.2	59.6	2.9	4.08	4.15
65	76	75.2	3.2	5.71	5.83
80	88.7	87.9	3. 2	6.72	6.89
100	113.9	113	3.6	9.75	10

Table 4 Dimensions and Nominal Mass of Steel Tubes — Medium

Table 4 Dimensions and Nominal Mass of Steel Tubes — Medium
(Clause 8.1)

Nominal Bore	Outside Diameter			Thickness	Mass of Tube
	Maximum	Minimum		Plain End	Screwed and Socketed
mm	mm	mm	mm	kg/m	kg/m

6	10.6	9.8	2	0.404	0.407
8	14	13.2	2.3	0.641	0.645
10	17.5	16.7	2.3	0.839	0.845
15	21.8	21	2.6	1.21	1.22
20	27.3	26.5	2.6	l.56	1.57
25	34.2	33.3	3.2	2.41	2.43
32	42.9	42	3.2	3.1	3.13
40	48.8	47.9	3.2	3.56	3.6
50	60.8	59.7	3.6	5.03	5.1
65	76.6	75.3	3.6	6.42	6.54
80	89.5	88	4	8.36	8.53
100	115	113.1	4.5	12.2	12.5
125	140.8	138.5	4.8	15.9	16.4
150	166.5	163.9	4.8	18.9	19.5

Table 5 Dimensions and Nominal Mass of Steel Tubes — Heavy

Table 5 Dimensions and Nominal Mass of Steel Tubes — Heavy
(Clauses 8.1 and 8.1.1)

Nominal Bore	Outside Diameter			Thickness	Mass of Tube
	Maximum	Minimum		Plain End	Screwed and Socketed
mm	mm	mm	mm	kg/m	kg/m
6	10.5	9.8	2.6	0.487	0.49
8	14	13.2	2.9	0.765	0.769
10	17.5	16.7	2.9	1.02	1.03
15	21.8	21	3.2	1.44	1.45
20	27.3	26.5	3.2	1.87	1.88
25	34.2	33.3	4	2.93	2.95
32	42.9	42	4	3.79	3.82
40	48.8	47.9	4	4.37	4.41
50	60.8	59.7	4.5	6.19	6.26
65	76.6	75.3	4.5	7.93	8.05
80	89.5	88	4.8	9.9	10.1
100	115	113.1	5.4	14.5	14.8
125	140.8	138.5	5.4	17.9	18.4
150	166.5	163.9	5.4	21.3	21.9

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Disclaimer

While we strive to provide accurate and up-to-date information, it is essential to verify the details from the official IS 1239 standard documents or consult with a qualified professional for critical applications.For more detailed information on specific pipe sizes, dimensions, and specifications, please refer to the official IS 1239 standard documentation.

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