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If you're a plumber and you're installing a meter, there are a few basics you need to know. For example, the distance you need to allow between the pipes depends on the size of the meter. You'll need to measure the distance you need to allow for light and heavy duty meters.
You need to measure between the ends of the threads to work out the distance needed to allow for these light duty meters. The arrows on the image show where to start and finish measuring.
Once you've done this, use the measurements below to work out your distance.
The arrows show where to start and finish measuring.
Meter size (DN) – drinking water |
Distance to allow – drinking water |
---|---|
20 mm |
260 mm |
25 mm |
310 mm |
32 mm |
350 mm * |
40 mm |
350 mm * |
50 mm light |
340 mm * |
The right-angle stop valve and elbow have male BSP threads. |
* This doesn't include the distance for the backflow prevention device. |
Meter size (DN) – recycled water |
Distance to allow – recycled water |
20 mm |
270 mm |
25 mm |
265 mm |
The right-angle stop valve has a female BSP thread. |
The elbow has a female BSP thread. |
You need to allow a minimum of 300mm clearance around these meters. This helps us safely read, maintain and exchange them in the future.
When you've got your distance right, you need to insert a bridging piece where the meter will go. We will remove the bridging piece when we install the meter.
Inserting the bridging piece
You need to insert the bridging piece where the meter will go. We remove the bridging piece when we install the meter.
A correctly installed meter
If everything is done correctly, we won't have any problems installing a meter later on. This is what a correctly installed meter looks like.
To work out the distance you need for these heavy duty meters, measure between the flange ends. These ends have flat surfaces instead of threaded ones.
Heavy duty meters
These meters have extra parts, so you need to allow distance for these too.
Then use these measurements to work out your distance.
Meter size |
Gate valve |
Dirt box |
Distance piece inlet |
Meter |
Distance piece outlet |
Meter assembly space |
---|---|---|---|---|---|---|
50 mm heavy duty |
175 mm |
208 mm |
372 mm |
311 mm |
150 mm |
1,216 mm |
80 mm |
203 mm |
252 mm |
396 mm |
413 mm |
240 mm |
1,504 mm |
100 mm |
229 mm |
260 mm |
476 mm |
483 mm |
300 mm |
1,748 mm |
150 mm |
267 mm |
406 mm |
762 mm |
500 mm |
450 mm |
2,385 mm |
200 mm |
292 mm |
428 mm |
1,000 mm |
520 mm |
600 mm |
2,840 mm |
250 mm |
330 mm |
522 mm |
1,250 mm |
450 mm |
750 mm |
3,302 mm |
300 mm |
356 mm |
580 mm |
1,500 mm |
500 mm |
900 mm |
3,836 mm |
We need you to allow a minimum of 500 mm clearance around these meters, too. This is so we can exchange them in future.