I thought I understood this, but maybe not. When determining the
effective point for a hydrant flow test, I was told that it is at the
junction of the flowing and non-flowing water. (for the purposes of
this discussion, let's assume that we are talking about a single
main, fed from both directions, with hydrants on branches off the
main. Pressures are read at one hydrant and another single hydrant is
flowed) If this is the case, then the effective point of of the flow
test would be at the junction of the main and the branch to the
hydrant where the pressures are read. However, this junction occurs
underground. If we assume that the gauge on the hydrant is 1'-6" off
the ground and the main is 5 ft underground, this would mean that the
pressures are read 6.5 ft above the effective point. The pressures at
the effective point would be 2.8 psi greater than those read at the
hydrant. Is or should a correction be included?
This makes a difference on programs such as Autosprink where you draw
a 3D model of the underground system and insert a supply at the
effective point.
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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