SEAMLESS AND WELDED PIPES

Seamless Pipes

Seamless pipes are in accordance with EEMUA–234, Section 1. They are manufactured from hot extruded shells followed by cold work and annealing.

Welded Pipes

Longitudinally welded pipes are in accordance with EEMUA–234, Section 2. They are manufactured from hot rolled or cold rolled and annealed sheet or plates in accordance with BS 2870, BS 2875, ASTM B171 or ASTM B402. Mechanical testing is carried out in accordance with the standards above. The pipes are supplied in “as welded” condition.

Dimensions

Dimensions are based on EEMUA –234, Tables 1.2.1-1.2.2 and 2.2.1-2.2.2. However, the pipe diameters range from ½ in./16 mm to 36 in./914 mm. Although the pipe dimensions of 38 in./965 mm and 40 in./1016 mm are not included in the EEMUA 234 – 1987 they are available on request as they are commonly specified. The corresponding wall thicknesses of the pipes comply with the pressure containment requirements of B31.3 as well as the requirements of the International Association of Classification Societies. Pipes with other wall thicknesses are available on request.

Seamless Pipe

Size Size Specified Wall Thickness (mm) t  Theoretical Weight/Metre (kg) 
Nominal (in) Specified (mm) 16 bar 20 bar 16 bar 20 bar
½ 16 2.0 2.0 0.78 0.78
¾ 25 2.0 2.0 1.29 1.29
1 30 2.5 2.5 1.93 1.93
38 2.5 2.5 2.49 2.49
44.5 2.5 2.5 2.94 2.94
2 57 2.5 2.5 3.82 3.82
76.1 2.5 2.5 5.15 5.15
3 88.9 2.5 2.5 6.05 6.05
4 108 3.0 3.0 8.82 8.82
6 159 3.0 3.5 13.10 15.24
8 219.1 4.0 4.5 24.10 27.04
10 267 4.5 5.5 33.10 40.27
12 323.9 5.5 7.0 49.05 62.10
14 368 6.5 8.0 65.80 80.64
16 419 7.0 9.0 80.75 103.32

Seam-welded Pipe

Size Size Specified Wall Thickness (mm) t  Theoretical Weight/Metre (kg) 
Nominal (in) Specified (mm) 16 bar 20 bar 16 bar 20 bar
16 419   9.0   103.32
18 457.2 8.0 9.5 100.62 119.10
20 508 8.5 11.0 118.90 153.10
24 610 10.5 13.0 176.30 217.30
28 711 12.0 15.0 234.90 292.21
32 813 13.5 17.0 302.20 378.76
36 914 15.5 19.0 390.00 475.97

Weld Preparation

For wall thickness less than 3 mm, the pipes are supplied with plain weld ends. Larger thicknesses are supplied with the weld bevel of 37 ½°±2 ½°.

Tolerances

  1. The pipe sizes up to including 4 in./108 mm are based on BS 2871: Part 2: Table 3 for outside diameters and their tolerances to allow for the use of capillary and compression fittings and brazed (and welded) slip-on flanges. The wall thickness of the 16 bar range have been increased to match the 20 bar range for mechanical strength.

  2. The pipe size 6 in./159 mm up to 16 in./419 mm are also based on BS 2871: Part 2: Table 3 for specified diameters but the tolerance have been applied to the inside diameters for facilitate alignment of matching weld preparations.

  3. The ovality of the finished pipe doesn’t exceed 2% of the difference of the maximum and minimum diameter measured on the same cross section.

  4. Up to including 4 in./108 mm, the wall thickness doesn’t vary by more than 10 % specified therein. For diameters from 6in./159 mm and larger, the wall thickness is not less than 12.5 % of the specified value.

The pipes with other dimensions than mentioned herein are available on request. Please contact us for more information.

Stock Dimensions

All seamless pipes are available from stock.