Flow Velocity (min.) (Siphonic Roof Drainage System)
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At the design flow rate:
- In accordance to BS 8490:2007, the minimum flow velocity in tailpipes, or sections of horizontal pipe longer than 1m, should be 1.0 m/s, in order to aid the removal of air during priming and prevent the build-up of sediment or other debris in the pipes;
The minimum flow velocity in downpipes should be 2.2 m/s, in order to promote efficient priming.
- In accordance to ASPE ANSI-45 Standard;
A fully primed flow (i.e., full-bore flow), the velocity in the stack shall be greater than 2.2 m/s for stack 150 mm and smaller. For pipes larger than 150 mm, refer to appropriate testing data from drain manufacturers. Minimum velocity is a function of pipe diameter.
References
- BS 8490:2007 Guide to siphonic roof drainage system (p.9 Clause 6.4)
- ASPE ANSI-45 (clause 7.7.5.4)
