BS 1387:1985 British Standard Specification

Screwed and Socketed Steel tubes and plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads

STANDARD CHEMICAL   COMPOSITION MECHANICAL   PROPERTIES Hydrostatic
Test
Mn P S Yield
Strength
Tensile
Strength
Elongation
Max% Max% Max% Max% (Min) (Min) (Min) (Bar)
Class Light 0.20 1.20 0.045 0.045 195 320-460 20 50
Class Medium 0.20 1.20 0.045 0.045 195 320-460 20 50
Class Heavy 0.20 1.20 0.045 0.045 195 320-460 20 50

 

Class Light Galvanized Steel Pipe
Nominal
Side
DN
Designation
of
Thread
Outside Diameter Wall
Thickness
mm.
Calculated Weight Threads
per
25.4 mm.
Number
of piece
per Bundle
Min
mm.
Max
mm.
Plain Ends
kg/m
Threads&Coupling
kg/m
15  1/2 21.0 21.4 2.0 0.947 0.956 14 169
20  3/4 26.4 26.9 2.3 1.38 1.39 14 127
25 1 33.2 33.8 2.6 1.98 2.00 11 91
32 1 1/4 41.9 42.5 2.6 2.54 2.57 11 61
40 1 1/2 47.8 48.4 2.9 3.23 3.27 11 44
50 2 59.6 60.2 2.9 4.08 4.15 11 37
65 2 1/2 75.2 76.0 3.2 5.71 5.83 11 24
80 3 87.9 88.7 3.2 6.72 6.89 11 19
100 4 113.0 113.9 3.6 9.75 10.00 11 14

 

Class Medium Galvanized Steel Pipe
Nominal
Side
DN
Designation
of
Thread
Outside Diameter Wall
Thickness
mm.
Calculated Weight Threads
per
25.4 mm.
Number
of piece
per Bundle
Min
mm.
Max
mm.
Plain Ends
kg/m
Threads&Coupling
kg/m
15  1/2 21.1 21.7 2.6 1.21 1.22 14 169
20  3/4 26.6 27.2 2.6 1.56 1.57 14 127
25 1 33.4 34.2 3.2 2.41 2.43 11 91
32 1 1/4 42.1 42.9 3.2 3.10 3.13 11 61
40 1 1/2 48.0 48.8 3.2 3.57 3.61 11 44
50 2 59.8 60.8 3.6 5.03 5.10 11 37
65 2 1/2 75.4 76.6 3.6 6.43 6.55 11 24
80 3 88.1 89.5 4.0 8.37 8.54 11 19
100 4 113.1 114.9 4.5 12.20 12.50 11 14
125 5 138.7 140.6 5.0 16.60 17.10 11 7
150 6 164.1 166.1 5.0 19.70 20.30 11 7

 

Class Heavy Galvanized Steel Pipe
Nominal
Side
DN
Designation
of
Thread
Outside Diameter Wall
Thickness
mm.
Calculated Weight Threads
per
25.4 mm.
Number
of piece
per Bundle
Min
mm.
Max
mm.
Plain Ends
kg/m
Threads&Coupling
kg/m
15  1/2 21.1 21.7 3.2 1.44 1.45 14 169
20  3/4 26.6 27.2 3.2 1.87 1.88 14 127
25 1 33.4 34.2 4.0 2.94 2.96 11 91
32 1 1/4 42.1 42.9 4.0 3.8 3.83 11 61
40 1 1/2 48.0 48.8 4.0 4.38 4.42 11 44
50 2 59.8 60.8 4.5 6.19 6.26 11 37
65 2 1/2 75.4 76.6 4.5 7.93 8.05 11 24
80 3 88.1 89.5 5.0 10.30 10.50 11 19
100 4 113.3 114.9 5.4 14.50 14.80 11 14
125 5 138.7 140.6 5.4 17.90 18.40 11 7
150 6 164.1 166.1 5.4 21.30 21.90 11 7

 

Tolerance Class Light Class Medium Class Heavy
Wall Thickness :  - 8%  + not limit  - 10%  + not limit  - 10%  + not limit
Weight :  + 10% , - 8% per piece   /  ± 4% per Bundle (Over 500 ft)
Length :  + 50 mm.  ,  - 0 mm.