33 05 05.31 - Hydrostatic Testing.pdf
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- West Pump Station Replacement Project
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- Chester County, Pennsylvania
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This is a technical specification document for hydrostatic testing procedures as part of the West Pump Station Replacement Project being undertaken by the Northwestern Chester County Municipal Authority in Pennsylvania. The specification establishes requirements for hydrostatic testing of pressure piping systems, including ductile iron and PVC piping, that will be installed during the project. The testing must be performed by an applicator with a minimum of three years' documented experience in hydrostatic testing work. Prior to testing initiation, contractors must submit testing procedures, equipment lists, testing sequence schedules, water disposal provisions, pressure gage calibration certificates, and applicant qualifications to the project authority.
The hydrostatic testing protocol requires pressurizing each piping section to 1.5 times the working pressure for a minimum two-hour duration, with pressure maintained within plus or minus 5.0 psi of the test pressure throughout. The specification references AWWA C600 and ASTM F 2164 standards and establishes a maximum allowable leakage formula using pipe length, diameter, and test pressure variables. All visible leaks must be corrected regardless of quantity, and any leakage exceeding calculated allowable limits requires locating the source, making corrections, and retesting until acceptable parameters are achieved. The specification mandates that trenches be backfilled and pressure piping thrust restraints be installed prior to testing commencement.
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Text version
33 05 05.31 – HYDROSTATIC TESTING
Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 1 000483.0450
SECTION 33 05 05.31 – HYDROSTATIC TESTING
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes: Hydrostatic testing of pressure piping.
B. Related Requirements:
1. Section 33 31 23 – Sanitary Sewerage Force Main Piping: Pipe materials and accessories normally encountered with municipal sanitary sewage force mains.
1.2 REFERENCE STANDARDS
A. American Water Works Association:
1. AWWA C600 - Installation of Ductile-Iron Water Mains and Their Appurtenances.
B. American Standard Testing Methods
1. ASTM F 2164 - Standard Practice for Field Leak Testing of Polyethylene (PE) and
Crosslinked Polyethylene (PEX) Pressure Piping Systems Using Hydrostatic Pressure.
1.3 SUBMITTALS
A. Section 01 33 00 – Submittal Procedures: Requirements for submittals.
B. Submit following items prior to start of testing:
1. Testing procedures.
2. List of test equipment.
3. Testing sequence schedule.
4. Provisions for disposal of flushing and test water.
5. Certification of test gage calibration.
C. Test and Evaluation Reports: Indicate results of piping tests.
D. Qualifications Statement:
1. Submit qualifications for applicator.
1.4 QUALIFICATIONS
A. Applicator: Company specializing in performing Work of this Section with minimum three years' documented experience.
PART 2 - PRODUCTS
2.1 HYDROSTATIC TESTING
A. Equipment:
1. Pressure pump.
Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 2 000483.0450
2. Pressure hose.
3. Water meter.
4. Test connections.
5. Pressure relief valve.
6. Pressure Gage: Calibrated to 0.1 psi.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 73 00 – Execution and Closeout Requirements: Requirements for installation examination.
B. Verify that piping is ready for testing.
C. Verify that trenches are backfilled.
D. Verify that pressure piping thrust restraints have been installed.
3.2 FIELD QUALITY CONTROL
A. Section 01 40 00 – Quality Requirements: Requirements for inspecting and testing.
B. Testing of Pressure Ductile Iron or PVC Piping:
1. Test system according to AWWA C600 and following:
a. Hydrostatically test each portion of pressure piping, including valved section, at 1.5 times working pressure of piping, based on elevation of lowest point in piping corrected to elevation of test gage.
b. Conduct hydrostatic testing for at least two hours.
c. Slowly fill with water portion of piping to be tested, expelling air from piping at high points.
d. Install corporation cocks at high points.
e. Close air vents and corporation cocks after air is expelled.
f. Raise pressure to specified test pressure.
g. Observe joints, fittings, and valves undergoing testing.
h. Remove and renew cracked pipes, joints, fittings, and valves that show visible leakage.
i. Retest.
j. Correct visible deficiencies and continue testing at same test pressure for additional two hours to determine leakage rate.
k. Maintain pressure within plus or minus 5.0 psi of test pressure.
l. Leakage is defined as quantity of water supplied to piping necessary to maintain test pressure during period of testing.
m. Compute maximum allowable leakage using following formula:
1) L = [SD x sqrt(P)]/C.
2) L = testing allowance, gph.
3) S = length of pipe tested, feet.
4) D = nominal diameter of pipe, inches.
5) P = average test pressure during hydrostatic testing, psig.
Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 3 000483.0450
6) C = 148,000.
7) If pipe undergoing testing contains sections of various diameters, calculate allowable leakage from sum of computed leakage for each pipe size.
2. If testing of piping indicates leakage greater than that allowed, locate source of leakage, make corrections, and retest until leakage is within acceptable limits.
3. Correct visible leaks regardless of quantity of leakage.
END OF SECTION 33 05 05.31
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