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Black steel pipes Electric resistance welded pipes (ERW) are used as a multi-purpose item, structural steel, firefighting, network pluming, scaffolding and many other usages including gas transmission networks. Hot dip galvanized steel pipes: By hot dipping ERW in molten zinc a protective layer is formed to resist corrosion, giving a longer life for steel pipes. The HDG pipe are used for potable water transmission networks, structural pipe for outdoors like fencing, handrails, scaffolding, riser pipes and many other applications for both indoors and outdoors. Light, medium and heavy series are available from these standard galvanized and black pipes, which are suitable for water lines (hot and cold), gas lines, firefighting, HVAC lines and electric poles. Pipes can be supplied and threaded according to BS 21 Jordan Standard No. 137
Class
Nominal Diameter (DN)
Designation of thread
Outside diameter
Mass of black tube
Wall
Thickness
mm
Inch
max
min.
mm
Plain end
Threaded and docketed
mm
mm
kg/m
kg/m
Light
15
½
21.4
21
2
0.952
0.961
20
¾
26.9
26.4
2.35
1.41
1.42
25
1
33.8
33.2
2.65
2.01
2.03
32
1 ¼
42.5
41.9
2.65
2.58
2.61
40
1 ½
48.4
47.8
2.9
3.25
3.29
50
2
60.2
59.6
2.9
4.11
4.18
65
2 ½
76
75.2
3.25
5.8
5.92
80
3
88.7
87.9
3.25
6.81
6.98
100
4
113.9
113
3.65
9.89
10.2
Medium
15
½
21.7
21.1
2.65
1.22
1.23
20
¾
27.2
26.6
2.65
1.58
1.59
25
1
34.2
33.4
3.25
2.44
2.46
32
1 ¼
42.9
42.1
3.25
3.14
3.17
40
1 ½
48.8
48
3.25
3.61
3.65
50
2
60.8
59.8
3.65
5.1
5.17
65
2 ½
76.6
75.4
3.65
6.51
6.63
80
3
89.5
88.1
4.05
8.47
8.64
100
4
114.9
113.3
4.5
12.1
12.4
125
5
140.6
138.3
4.85
16.2
16.7
150
6
166.1
164.1
4.85
19.2
19.8
Heavy
15
½
21.7
21.1
3.25
1.45
1.46
20
¾
27.2
26.6
3.25
1.9
1.91
25
1
34.2
33.4
4.05
2.97
2.99
32
1 ¼
42.9
42.1
4.05
3.84
3.87
40
1 ½
48.8
48
4.05
4.43
4.47
50
2
60.8
59.8
4.5
6.17
6.24
65
2 ½
76.6
75.4
4.5
7.9
8.02
80
3
89.5
88.1
4.85
10.1
10.3
100
4
114.9
113.3
5.4
14.4
14.7
125
5
140.6
138.3
5.4
17.8
18.3
150
6
166.1
164.1
5.4
21.2
21.8
