Video: How to measure plastic pipe (2 mins)


Sub-Categories

Technical talk for metric pvc pipe

Tech Talk about Inch (Imperial) PVC Pipe


Do I need 10 bar or 16bar pipe?

Most applications operate way below 10 bar pressure and so this is by far the most widely used. Industries such as water treatment, pool and leisure, aquaculture, industrial process/factory lines etc. operate with maximums of 3-5bar pressure. It is often thought that just because a system has a pump it must be very high pressure, but in truth, most pump systems operate a just a few bar pressure. 16 bar pipe is usually only used in very specific high pressure industrial applications such as jet wash lines, high head hydropower schemes etc.

Pressure conversion - to pump water vertically by 10m requires 1 bar. More information is available inthis technical document

Dimensions

Unlike it's Imperial (inch) cousin, the metric pvc pipe system is measured on and accords to the precise outside diameter of the pipe. Like most things metric it is a more logical and easier to understand system. That is to say, a 50mm metric pipe will measure 50mm outside diameter, a 63mm will measure 63mm etc.

The table below gives details of metric pipe dimensions:

Pipe Size

16mm
20mm
25mm
32mm
40mm
50mm
63mm
75mm
90mm
110mm
125mm
140mm
160mm
200mm

Outside Diameter mm

16
20
25
32
40
50
63
75
90
110
125
140
160
200

Wall thickness 10 bar (mm)

-
1.0
1.25
1.8
1.9
2.4
2.4
2.9
3.5
4.2
4.8
5.4
6.2
7.7

Wall thickness 16 bar (mm)

1.5
1.5
1.9
2.4
3.0
3.7
3.8
4.5
5.4
6.6
7.4
8.3
9.5
11.9

Temperature Ratings

Metric PVC Pipe has an operational range of between zero and sixty degrees centigrade (32 - 140 degrees F), although operation at zero centigrade is not recommended, especially where there is risk of impact or stresses to the pipe. PVC pipe becomes increasingly brittle at lower temperatures and more prone to damage from impact.

Pressure Ratings

We supply our metric plastic pipe in 2 pressure ranges, 10 bar and 16 bar (147 and 235 psi) respectively. For most applications we would recommend our 10 bar pipe, as it is only in special pressure jet or other intense applications where pressures in systems exceed 10 bar (the equivalent of 100m of water head!). As plastic pipe changes properties (primarily ductility) as the temperature increases, so the pressure rating of the pipe also changes. The table below provides pressure de-rating multiples for each temperature and is used by multiplying the pressure rating of the pipe by the corresponding multiple in the table:

Pressure derating multiples of metric PVC pipe

Operating Temprature

<0 deg C
0-20 deg C
30 deg C
40 deg C
50 deg C
60 deg C
>60 deg C

De-Rating multiple

Not recommended
As stated
0.80
0.58
0.39
0.22
>Not recommended

Pipework supports for Metric PVC

It is preferable ti use plastic pipe clips to support your PVC pipe. Using plastic clips prevents any "chafing" of teh pipe as it moves either as a result of vibration from machinery or from expansion / contraction during temperature changes. Rubber lined pipe clips are preferred by many installers as they are more versatile, however these should only be used in short pipe runs, as they grip the pipe very hard and can cause distortion during expansion and contraction. The table below gives the recommended spacing between pipe clips / supports. This should be increased by approximately 15% for every 10 degrees centigrade over 20 degrees.

Pipe Size (inches)

20
25
32
40
50
63
90
110
160
200

Minimum space (mm) between support centres

800
900
1000
1100
1200
1300
1600
1800
2200
2500
//
arrow_upward