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Galvanized Iron Pipes
Introduction
The 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.
Applications
For ordinary Conyeyance of steam, gas,
air, water etc...
End Connection and End
Protection
The 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 Marking
Tubes are marked by colour bands about 50mm wide
:-
| Class A ( Light) |
Class B ( Medium ) |
Class B ( Medium ) |
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Brown |
Blue |
Red |
Technical Specification,
Wall Thickness and Dimension
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Materials
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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. |
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Mechanical Properties |
Tensile strength :
Between 21 ton f/in2 ( 33 kg f/mm2 ) and
30 ton f/in2 ( 47 kg f /mm2 ). Elongation on a
gauge length of 5,65/so: not less than 20%. |
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Permissible Variation In Wall Thickness |
Light Welded Tubes -
-8% + not limited
Medium and Heavy Welded Tubes
-10% + not limited |
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Hot Dipped Galvanizing |
Shall pass the four dip
copper sulphate test prescribed as BS1387:1967 specification. |
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Hydraulic Test Pressure |
700 Ibs /in2 (
50kgf/cm2 ) |
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Bending Test |
Performed 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. |
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Flattening Test |
Performed on the tube
sizes over 2 in. using rings not less than 1-1/2 in. ( 38mm ) 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 Pressure
Please downloading on the following links for details information :-
 Class A ( Light
Duty )
Class B ( Medium
Duty )
Class C (
Heavy Duty
Kindly
download the Adobe
Acrobat Reader @ 6.0 for free software to
viewing and printing the pdf files.
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