What is the maximum spacing for pipe clips and supports?
Summary (TL;DR)
AS/NZS 3500 dictates strict maximum spacing for pipe supports to prevent sagging and water hammer. For example, DN 20 copper pipe must be clipped every 1.5m horizontally, while DN 100 PVC drainage pipe must be supported every 1.2m horizontally.
Pipe Clipping and Support Rules (AS/NZS 3500)
Inadequate pipe support leads to sagging, stress on joints, noisy water hammer, and eventual failure. The required spacing depends entirely on the material of the pipe, its diameter, and whether it is running horizontally or vertically.
Copper Pipe (Water Supply)
Copper is rigid, so it requires fewer clips than plastic pipes. Typical maximum horizontal spacing:
- DN 15 (1/2"): 1.5 metres
- DN 20 (3/4"): 1.5 metres
- DN 25 (1"): 2.0 metres
PEX Pipe (Water Supply)
PEX is flexible and can sag when hot water runs through it, requiring closer clipping. Typical maximum horizontal spacing:
- DN 16: 0.6 metres
- DN 20: 0.7 metres
PVC Pipe (Sanitary Drainage)
Suspended PVC drainage pipes must be supported to maintain their gradient. Typical maximum horizontal spacing:
- DN 50: 1.0 metres
- DN 100: 1.2 metres
Vertical Pipes
Vertical pipes generally require fewer supports because they don't sag. For example, vertical DN 100 PVC can be supported every 2.5 metres, while vertical DN 20 copper can be supported every 2.0 metres.
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