Difference between revisions of "Flow Velocity (min.) (Siphonic Roof Drainage System)"
(Created page with "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...") |
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At the design flow rate: | 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; | + | *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. |
| − | 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. |
| − | *In accordance to ASPE ANSI-45 Standard | ||
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== References == | == References == | ||
#BS 8490:2007 Guide to siphonic roof drainage system (p.9 Clause 6.4) | #BS 8490:2007 Guide to siphonic roof drainage system (p.9 Clause 6.4) | ||
#ASPE ANSI-45 (clause 7.7.5.4) | #ASPE ANSI-45 (clause 7.7.5.4) | ||
Latest revision as of 11:29, 12 September 2017
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)
