Technical talk for metric pvc pipe

Tech Talk about Inch (Imperial) PVC Pipe


Dimensions

Imperial Inch PVC pipe is measured in inches. the measurement relates to the nominal bore (the "approximate" bore) of the pipe, NOT the outside diameter.

The outside diameter (O.D.) and internal diameter (I.D) are set out in millimetres in a table below for the different pipe pressure ratings ("or classes"):

Imperial PVC pipe dimensions:

Pipe Size

1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"

Outside Diameter(mm)

21.4
26.7
33.2
42.2
48.3
60.3
75.2
88.9
114.3
168.3
219.1

Wall thickness (mm) Class C, 9 bar

1.7
1.9
2.2
2.2
2.5
2.5
2.9
3.5
4.5
7.5
8.8

Wall thickness (mm) Class E, 15 bar

1.7
1.9
2.2
3.2
3.7
4.5
5.6
6.5
8.3
12.1
14.1

Wall thickness (mm) Class 7 (For threading)

4
4.2
4.8
5.2
5.5
5.9
-
-
-
-
-

Dimensions

All of our inch industrial PVC (PVCU) pipe is supplied in a mid to dark grey colour and is WRAS approved quality for drinking water. As such it is suitable for any potable water supply as well many other process fluids.

Temperature and Pressure

Our Inch PVC pipe is specified to operate at temperatures of between 0 and 60 degrees centigrade (32 - 140 Fahrenheit). Users should be aware that PVC becomes more prone to impact damage at lower temperatures, and we recommend that at if there is an impact risk at operational temperatures of below 5 Centigrade (41 Fahrenheit), then ABS pipe should be considered as an alternative. ABS pipe is far more impact resistant and will operate down to -40C (-40F).

In common with other types of plastic pipe, the pressure rating for PVC pipe changes with temperature. As the temperature increases, the pressure rating falls. Use the table below to find the factor to multiply your pipe's pressure rating by to compensate for temperature:

Pressure derating factors for PVC Pipe

Operating Temperature deg C

<0
0-20
30
40
50
60
60>

De-Rating factor

Not reccomended
As stated
0.80
0.58
0.39
0.22
Not reccomended

Supporting your Inch PVC Pipe and fittings

PVC inch pipe should only be supported using either plastic clips, or rubber lined galvanised clips over short spans. Using rubber lined clips over long spans can cause issues if the pipe expands and contracts with temperature, as he pressure from the clips prevents the pipe from moving in accordance to the expansion/contraction.

As temperature increases, your pipe supports should be closer together, however the table below provides a distance, between each pipe support point, at 20 degrees Centigrade (Increase by approximately 15% per 10 degrees above 20C):

Pipe Size (inches)
1/2
3/4
1
1 1/4
1 1/2
2
3
4
6
8
10
Minimum space (mm) between support centres
800
900
1000
1100
1200
1300
1600
1800
2200
2500
2800
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