33 05 05.31 - Hydrostatic Testing.pdf

33 05 05.31 - HYDROSTATIC TESTING

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 1 005153.0436

SECTION 33 05 05.31 - HYDROSTATIC TESTING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: Hydrostatic testing of pressure sanitary sewer and water 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.

2. Section 33 14 16 - Site Water Utility Distribution Piping: Pipe materials and accessories normally encountered with pressurized water distribution systems.

1.2 REFERENCE STANDARDS

A. American Water Works Association:

1. AWWA C600 - Installation of Ductile-Iron Water Mains and their Appurtenances.

2. AWWA C605 - Underground Installation of Polyvinyl Chloride (PVC) and

Molecularly Oriented Polyvinyl Chloride (PVCO) Pressure Pipe and Fittings.

3. AWWA C900 - Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, for

Water Service.

4. AWWA C901 - Polyethylene (PE) Pressure Pipe and Tubing, for Water Service.

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.

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 2 005153.0436

PART 2 - PRODUCTS

2.1 HYDROSTATIC TESTING

A. Equipment:

1. Pressure pump.

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 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.

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 3 005153.0436

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.

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.

C. Testing of Pressure PE Piping:

1. Test system according to ASTM F 2164 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. Initial expansion phase:

1) Slowly fill with water portion of piping to be tested, expelling air from piping at high points.

2) Install corporation cocks at high points.

3) Close air vents and corporation cocks after air is expelled.

4) Raise pressure to specified test pressure.

5) Observe joints, fittings, and valves undergoing testing.

6) Add make-up water as necessary to maintain maximum test pressure for 4 hours.

c. Test Phase.

d. Immediately after expansion phase, reduce test pressure by 10 psi and stop adding makeup water.

e. Monitor pressure for 1 hour.

f. Remove and renew cracked pipes, joints, fittings, and valves that show visible leakage.

g. Retest after section is depressurized for 8 hours, minimum.

h. If no visual leakage is observed and test pressure remains within 5% of the target pressure, no leakage is indicated.

2. If testing of piping indicates leakage, 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