Leakage test Clause Samples

Leakage test. All systems shall be watertight. A static pressure test shall be performed on all systems prior to disinfecting any portion of the system.

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Leakage test. A system leakage test shall be performed. The probe shall be disconnected from the exhaust system and the end plugged. The analyser pump shall be switched on. After an initial stabilization period all flow meters will read approximately zero in the absence of a leak. If not, the sampling lines shall be checked and the fault corrected. The maximum allowable leakage rate on the vacuum side shall be 0.5 per cent of the in-use flow rate for the portion of the system being checked. The analyser flows and bypass flows may be used to estimate the in-use flow rates. Alternatively, the system may be evacuated to a pressure of at least 20 kPa vacuum (80 kPa absolute). After an initial stabilization period the pressure increase Δp (kPa/min) in the system shall not exceed: Δp = p / Vs x 0.005 x qvs (60) where: Vs is the system volume, l qvs is the system flow rate, l/min Another method is the introduction of a concentration step change at the beginning of the sampling line by switching from zero to span gas. If for a correctly calibrated analyser after an adequate period of time the reading is ≤ 99 per cent compared to the introduced concentration, this points to a leakage problem that shall be corrected.

Leakage test. 1. A leakage test shall be conducted after the pressure test has been satisfactorily completed. The Contractor shall, as before, furnish all pumps, pipe, connections and other items required to satisfactorily complete the leakage test. The leakage test shall have a duration of two hours at the pressure specified for the pressure test. No pipe installation will be accepted if the leakage is greater than that determined by the formula for mechanical and push-on joints: SDP1/2 L= Allowable leakage [gph] L= ---------- S= Length of pipe tested [feet] 148,200 D= Nominal diameter of pipe [inches] P= Average pressure during test [psig] 2. The Project Representative, or his duly authorized representative, shall witness these tests. The Contractor shall be responsible for finding and repairing leaks. No additional cost may be incurred by the Owner due to repairs because of failure of either test. The Project Representative has the authority to determine the number of repairs that will be made within a given length of pipe and has the right to request the Contractor to remove and relay a section of pipe if such does not comply with the established leakage rates as shown in the following table: 3 0.25 4 0.33 6 0.50 8 0.66 10 0.83 12 0.99 16 1.32

Leakage test. A. All newly installed and backfilled pipe shall be subjected to a leakage test, conducted in the presence of OWNER. B. Test pressure shall be 150 percent of system operating pressure based on pressure as measured at lowest point in pipeline. C. The force main shall be slowly filled with water, and the specified test pressure shall be applied (based on the elevation of the lowest point of the line or section under test and corrected to the elevation of the test gauge) with a pump connected to the pipe in a manner satisfactory to OWNER. CONTRACTOR shall furnish the pump, pipe, connections, gauges, and all necessary apparatus. D. Before applying the specified test pressure, all air shall be expelled from the pipe. If necessary, CONTRACTOR shall make taps at the points of highest elevation before testing, and shall insert plugs after the test has been completed. E. The leakage test shall be conducted by measuring, through a calibrated meter, the amount of water which enters the test section for a period of at least 2 hours. No installation will be accepted until the leakage is less than the number of gallons per hour as determined by the formula: For Ductile Iron Pipe: 1,850 For PVC Pipe: 7,400 L = allowable leakage, gallons/hour N = number of joints in length of pipe tested D = nominal diameter of the pipe, inches The following table has been developed for the commonly used sizes of ductile iron pipe and PVC pipe with nominal laying lengths of 20 feet, under a test pressure of 150 psi. The leakage formulas above may be used when conditions differ from those stated parameters. For HDPE Pipe: 1. Make-up Water Allowance: a. Maximum allowable make-up water at conclusion of test phase shall not exceed recommended amounts stated in the following table. b. Table is based on test pressure equal to 1.5 times pressure class of pipe. If lower pressure is used for test, allowances shall be reduced by ratio of test pressure to pressure class of pipe. 3 0.10 0.15 4 0.13 0.25 6 0.30 0.60 8 0.50 1.0 10 0.75 1.3 12 1.1 2.3 14 1.4 2.8 16 1.7 3.3 18 2.2 4.3 20 2.8 5.5 24 4.5 8.9 28 5.5 11.1 32 7.0 14.3 36 9.0 18.0 Note: No observed leaks. F. Any cracked or defective pipes or fittings discovered in consequence of this leakage test shall be replaced with sound material in the manner specified at no cost to OWNER. The test shall be repeated until the results are satisfactory to OWNER.

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