33 05 05.31 - Hydrostatic Testing.pdf

33 05 05.31 - HYDROSTATIC TESTING

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 1 000598.0465

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 Pressure Piping: Pipe materials and accessories normally encountered with low-pressure sanitary sewage collection systems where on-lot grinder pumps convey domestic sewage.

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 gauge calibration.

C. Test and Evaluation Reports: Indicate results of piping tests.

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.

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 2 000598.0465

6. Pressure Gauge: Calibrated to 0.1 psi.

PART 3 - EXECUTION

3.1 GENERAL REQUIREMENTS

A. Conduct tests specified herein so that each pipeline installed in the Project is tested to the Engineer’s satisfaction. All piping shall be properly flushed and tested unless otherwise approved by the Engineer.

B. The Contractor shall furnish and install all means and apparatus necessary for getting the air or water into the pipeline for flushing and testing including pumps, pipe connection to main, compressors, gauges, meters, any necessary plugs and caps, and any required blow-off piping and fittings, etc., complete with any necessary reaction blocking to prevent pipe movement during the flushing and testing. The Contractor shall provide water for all flushing and testing of pipelines. Non-potable water may be used for flushing and testing pipelines not connected to the potable water system.

C. Contractor shall thoroughly clean all new pipe by flushing with water or other means to remove all dirt, stones, pieces of wood, etc., which may have entered the pipe during the construction period. If after this cleaning any obstructions remain, they shall be corrected by the Contractor, at his own expense, to the satisfaction of the Engineer. Pipelines shall be flushed at the rate of at least 2.5 feet per second for a duration suitable to the Engineer or shall be flushed by other means approved by the Engineer.

3.2 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.

3.3 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/C605 and the 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 gauge.

b. Time length for hydrostatic testing: 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.

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 3 000598.0465

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 √(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.

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:

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

2) Monitor pressure for 1 hour.

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

Herbert, Rowland & Grubic, Inc. 33 05 05.31 - 4 000598.0465

2. If testing of piping indicates leakage, locate source of leakage, make corrections, and retest until leakage is within acceptable limits.

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

4. Correct visible leaks regardless of quantity of leakage.

END OF SECTION