bs 1139 standard scaffolding steel tube

bs 1139 standard scaffolding steel tube

1, Steel No.

B These five elements combined shall not exceed +/-1 %.

2, Diameter & Tolerance:

For pipe = NPS 11⁄2 [DN 40], the outside diameter at any point shall not vary more than 1⁄64 in. [0.4 mm].

For pipe =NPS 2 [DN 50], the outside diameter shall not vary more than +/-1%.

3, Tensile Requirements

Grade A
Minimum Yield: 30,000 PSI (205MPa)
Minimum Tensile: 48,000 PSI (330MPa)

Grade B
Minimum Yield: 35,000 PSI (240MPa)
Minimum Tensile: 60,000 PSI (415MPa)

4, Wall Thickness & Tolerance:

Wall thickness: Scheduled
Wall Tolerance: +/- 12.5%

5, Galvanized

1), Zinc: The zinc used for the coating shall be any grade of zinc conforming to Specification B 6

2), Weight of Coating   The weight of zinc coating shall be not less than 1.8 oz/ft2[0.55 kg/m2] as determined from the average results of the two specimens taken for test in the manner prescribed in 19.5 and not less than 1.6 oz/ft2[0.49kg/m2] for either of these specimens. And testing the weight of zinc according to ASTMB90

6, Common Uses:

- Low pressure systems

- Structural applications

- Mechanical components

- Bollards

- Casing

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