DATE: / CONTRACT MANAGER:
CONTRACT NO.: / INSPECTOR:
LOCATION: / LINE & GRADE:
CONTRACTOR: / COMPUTED BY:
SIZES & TYPES OF WATER MAIN: / CHECKED BY:
BOX 1 2 HOUR HIGH PRESSURE TEST
High Hydraulic Gradient per contract drawings
Minus lowest invert within test section / –
Total / =
X .434
Equals the pressure at low point / =
Lowest Surge Pressure per Standard Specifications / +
Total / = PSI / = Maximum test pressure at lowest invert
BOX 2 PRESSURE AT LOCATION OF GAUGE FOR 2 HOUR HIGH PRESSURE TEST
Difference between lowest invert and gauge / Lowest invert
Elevation of pressure gauge / –
Difference in elevations / = / x .434 / =
Pressure Difference
Pressure difference plus or minus to maximum test pressure, dependent on location of / Maximum test pressure at lowest invert
(from Box 1) / PSI
pressure gauge. / + or – Pressure Difference / +/– / PSI
Gauge Reading / = / PSI
BOX 3 COMPUTATION FOR ALLOWABLE LEAKAGE USING THE FOLLOWING FORMULA
Highest invert
Lowest invert / – / Maximum test pressure at lowest invert
Difference / = / Subtract Pressure Difference / –
X .434 / Equals Maximum test pressure at highest invert / =
Equals Pressure Difference
Maximum test pressure at lowest invert / PSI
+ Maximum test pressure at highest invert / + / PSI
=
2 / = / PSI
Average test pressure
/ L = SDvP133200
(S) length of pipe in test section broken down by pipe size(s) / S = Length of pipe in test section, in feet
(Multiplied) by (D) diameter of pipe / D = Nominal diameter of test pipe, in inches
Equals =
TOTAL (the sum from all of the above row) / P = Average test pressure, psi
Multiplied by square root of average pressure x / computed by averaging the
Equals = / pressure at the low and high points.
(Divided) ÷ / 133,200
Equals MAXIMUM ALLOWABLE Leakage (L) = / L = Maximum allowable leakage, gallons/hour
2 hour allowable leakage
System Extension Permit Document2 JANUARY 2007