The British Standard Steel Tubes are produced to BS1387: 1967, it is produced in three thickness class which known as Class A
Galvanized Iron Pipes IntroductionThe British Standard Steel Tubes are produced to BS1387: 1967, it is produced in three thickness class which known as Class A, Class B and Class C . Also available in black welded or hot dipped galvanised finish in 6 meter length. ApplicationsFor ordinary Conyeyance of steam, gas, air, water etc . End Connection and End ProtectionThe Pipes have produced to two type of end connection : - Plain end square cut ( P/ E )
Threaded and Fixed with coupling ( T/ C ) - Supplied screwed with taper threads to BS21 and fitted with one taper threaded malleable iron socket.
Identification MarkingTubes are marked by colour bands about 50 mm wide : - Class A ( Light) Class B ( Medium ) Class B ( Medium )
BrownBlueRed
Technical Specification, Wall Thickness and DimensionMaterials The tubes and steel sockets shall be manufactured from steel which shows, on analysis, not more than 0. 006% of suiphur and not more than 0. 006% of phosphorus.
Mechanical PropertiesTensile strength : Between 21 ton f/ in2 ( 33 kg f/ mm 2 ) and 30 ton f/ in2 ( 47 kg f / mm 2 ) . Elongation on a gauge length of 5, 65/ so: not less than 20% .
Permissible Variation In Wall ThicknessLight Welded Tubes - - 8% + not limited
Medium and Heavy Welded Tubes - 10% + not limited
Hot Dipped GalvanizingShall pass the four dip copper sulphate test prescribed as BS1387: 1967 specification.
Hydraulic Test Pressure700 Ibs / in2 ( 50kgf/ cm2 )
Bending TestPerformed on tube size 2 in and smaller, with the weld at 90% to the place of bending, Black tubes shall capable of being bent cold, without cracking through 1800 round a former having a radius equal to six times the outside diameter of the tube of the tube and galvanized tube through 900 round a former with a radius equal to eight times the outside diameter of the tube.
Flattening TestPerformed on the tube sizes over 2 in. using rings not less than 1- 1/ 2 in. ( 38 mm ) in kength cut from the ends of selected tubes. When such rings are flattened between parallel plates with the weld at 900 ( point of maximum bending ) no opening shall occur by fracture in a weld until the distance between the parallel plates is less than 75% of the original outside diameter of the tube and no cracks or breaks in the metal other than in a weld shall occur, until the said distance between the plates is less than 60% of the original outside diameter.
Wall Thickness, Diameter And Test PressurePlease downloading on the following links for Detail s information : -
