BS 1387 STANDARD POPULAR FOR STEEL PIPE SPECS
BS 1387 (EN 10255), A British standard for welded black pipes for screwing to BS21 pipe threads, BS 1387 hot galvanized steel pipe suitable for Threading widely used for gas, air and water transmission, civil and other structures purposes. BS1387 ERW galvanized steel pipe which nominal size DN8-DN150 in light, medium and heavy thickness
TOLERANCE and EXAMPLE
a) On Thickness Light Tubes = + Not Limited, – 8%. Medium & Heavy tubes = + Not Limited , -10%
b) On Mass for quantities of 150 Mtr., and over of one size =+/- 4%, for single tube =+10% / -8%.