2 HOUR HIGH PRESSURE LEAKAGE TEST, WATER MAIN …



2 HOUR HIGH PRESSURE LEAKAGE TEST, WATER MAIN COMPUTATIONS | |

|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 |Maximum test pressure at lowest invert | |      | |

|pressure, dependent on location of |(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 = SDvP |

| | | | | |133200 | |

|(S) length of pipe in test section broken |      |      |      |      |S = Length of pipe in test section, in|

|down by pipe size(s) | | | | |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 |

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