DIMENSIONS

CHS
Circular
hollow
sections
Maximum Safe Working Pressures
Medium & Heavy Pressure Pipe – Specification: AS 1074 / BS 1387
Maximum Safe Working Pressure
Metal Temperature ºC
-45ºC to 50ºC 100 150 200 250 300 350 400
Maximum
Recommended
Test Pressure at
Ambient Temp
Mass per Metre
Black
Plain
Ends
& Grooved
Wall
Thickness
Nominal
Size
Outside
(DN) Quality Diameter
Outside
mm mm kg/m MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I. MPa P.S.I.
2130
2810
14.7
19.4
2220
2940
15.3
20.2
2410
3190
16.6
22.0
2690
3560
18.5
24.5
3030
4020
20.9
27.7
3380
4470
23.3
30.8
3720
4930
25.6
33.9
4070
5380
28.0
37.1
6100
8070
42.0
55.6
0.641
0.765
2.3
2.9
13.5
13.5
8 Medium
Heavy
1610
2100
11.1
14.5
1680
2190
11.6
15.1
1820
2380
12.5
16.4
2030
2660
14.0
18.3
2290
3000
15.8
20.6
2550
3340
17.6
23.0
2810
3680
19.4
25.3
3070
4020
21.2
27.7
4610
6020
31.7
41.5
0.839
1.02
2.3
2.9
17.2
17.2
10 Medium
Heavy
1450
1840
9.99
12.7
1510
1920
10.4
13.2
1640
2080
11.3
14.3
1830
2320
12.6
16.0
2070
2620
14.2
18.0
2300
2920
15.9
20.1
2540
3210
17.5
22.1
2770
3510
19.1
24.2
4160
5270
28.6
36.3
1.21
1.44
2.6
3.2
21.3
21.3
15 Medium
Heavy
1120
1410
7.71
9.70
1170
1470
8.05
10.1
1270
1590
8.73
11.0
1420
1780
9.75
12.3
1600
2010
11.0
13.8
1780
2240
12.2
15.4
1960
2460
13.5
17.0
2140
2690
14.7
18.5
3210
4040
22.1
27.8
1.56
1.87
2.6
3.2
26.9
26.9
20 Medium
Heavy
1100
1400
7.56
9.68
1150
1470
7.90
10.1
1240
1590
8.56
11.0
1390
1780
9.56
12.2
1570
2000
10.8
13.8
1740
2230
12.0
15.4
1920
2460
13.2
16.9
2100
2690
14.5
18.5
3150
4030
21.7
27.8
2.41
2.94
3.2
4.0
33.7
33.7
25 Medium
Heavy
856
1090
5.90
7.51
894
1140
6.16
7.84
969
1230
6.68
8.50
1080
1380
7.46
9.50
1220
1550
8.41
10.7
1360
1730
9.37
11.9
1500
1910
10.3
13.1
1640
2080
11.3
14.4
2450
3120
16.9
21.5
3.10
3.80
3.2
4.0
42.4
42.4
32 Medium
Heavy
745
946
5.13
6.52
778
988
5.36
6.80
843
1070
5.81
7.38
942
1200
6.49
8.24
1060
1350
7.32
9.30
1180
1500
8.15
10.4
1300
1660
8.98
11.4
1420
1810
9.81
12.5
2140
2710
14.7
18.7
3.57
4.38
3.2
4.0
48.3
48.3
40 Medium
Heavy
Notes:
1. The above maximum recommended test and working pressures are applicable only to the pipe, if and only if
• The applied loads are only from internal pressure in straight pipe. The pipeline should be supported so that bending and external loads are avoided. The pipeline must also be set up with suitable
freedom of angular movement at joints and bends and with provision to accommodate thermal expansion.
• The maximum working pressure is based on a design strength of 130 MPa at 50ºC, and 90% of the nominal wall thickness to allow for the minimum thickness tolerance of the relevant standard.
• AS 4041 limits the maximum pressure of this type of pipe (Class 2) to 10 MPa when carrying Very Harmful Fluids (fluid type 2) and for Harmful gases (fluid type 3). This should be considered when
designing pipelines. See the OneStreel publication ‘Fluid type and classes for pressure piping systems’ for information on fluid types.
• Use of this pipe is prohibited where the pipe contents are Lethal (AS 4041 fluid type 1). See the OneSteel publication ‘Fluid type and classes for pressure piping systems’ for information on fluid types.
2. The piping system working pressures can be limited by the type of couplings or the welding class used in the design of the pipeline.
3. AS 3920.1 gives information on the hazard level of pressure piping and other pressure equipment and the QA required to certify design, manufacture and installation.
4. Pressures have been calculated in accordance with AS 4041-1998 and the draft revision ME/1/8/00-28. p=2feMtf /(D-tf) where
p = Safe working pressure. M = 0.7 Class design factor from AS 4041 table 3.12.3 for class 2.
f = Design strengths from table D2 of AS 4041 for AS 1074 product. tf = 0.9 x wall thickness, in mm.
e = 0.85 Weld joint factor from table 3.12.2 of AS 4041 for AS 1074 ERW product. D = Outside diameter, in mm.
5. No allowance has been made for corrosion, threading, grooving or machining.
68
Dimensions and Properties Handbook