BS1387 Hot Galvanized Steel Pipe

BS 1387 (EN 10255) ,A british standard for welded black pipes for sercwing to BS21 pipe trheads, 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 linght,medium and heavy thickness.

1. TOLERANCE 

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%.

2. ENDS: 

Cut cleanly and nominally square with the axis of the tube and free from excessive burrs.

3. BEND TEST (COLD)

Applicable to tubes upto and including nominal size of 50mm.

a) For black tubes bend upto 180 degrees around a cylindrical mandrel, the Dia of which is 6 times the OD of pipe.

b) For Galvanized pipe bend upto 90 degree around a cylindrical mandrel, the dia of which is 8 times the OD of pipe .

Tubes shall withstand the test without showing any signs of fracture or failure.

4. FLATTENING TEST

Applicable to tubes greater than nominal size of 50mm.(COLD)

a) For weld: Distance between the platens, measured under load is not greater than 75% of the OD of tube.

b) For Material: Distance between the platens, measured under load is not greater than 60% of the OD of tube.

5. LEAK TIGHTNESS TEST

Online NDT (Eddy current )

b) Hydro test at a pressure of 50 bar.

6. BLACK VARNISH

Tubes are uniformly varnished externally over their full lengths.

7. ZINC COATING

55 to 70 Microns, uniformity of coating to withstand 4, one minute dips in copper sulphate solution.

(GALVANIZING)

8. THREADING

The taper or thread is according to BS 21 standard.

For 1/2" to 3/4" - 14 TPI and from 1" to 6" - 11 TPI

With 2 colour bands one near each ends of 50 mm width (A class - Brown, B Class - Blue & C Class - Red).

Check with standard BS ring and plug gauges.

9. MARKING

a) We can emboss mill sign "UTP/Spec." online at every one meter interval over the length of pipe.

b) We can do online stencilling as per customer needs.

10 PACKING

Hexagonal type.

11.MILL TEST CERTIFICATE

We can issue a MTC, certifying that the tubes supplied comply with this British Standard.

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