33 05 05.36 - Vacuum Testing.pdf
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- Attached to
- 2027 Sewer System Improvements Project
- Solicitation number
- Not on record
- Issued by
- Dauphin County, Harveys Lake Borough, Pennsylvania
About this file
This is a technical specification document for vacuum testing of sewage and stormwater manholes, prepared by Capital Region Water (CRW) in Pennsylvania for its 2027 Sewer System Improvements Project. The specification establishes comprehensive requirements for vacuum testing procedures that contractors must follow prior to backfilling newly constructed or repaired manholes. Testing must comply with ASTM C1244 standards and requires contractors to submit testing procedures, equipment lists, testing sequence schedules, water disposal provisions, and test gage calibration certifications prior to commencing work. The vacuum testing process involves drawing a vacuum to 10 inches of mercury and monitoring for pressure loss over specified durations based on manhole diameter, with test periods ranging from 60 seconds for 4-foot diameter manholes to 120 seconds for 8-foot diameter manholes. Acceptable performance requires that vacuum drop does not exceed 1 inch of mercury during the test period; manholes exceeding this threshold must be repaired and retested at no additional cost to the owner.
The specification requires contractors to provide qualified applicators and maintain specific equipment including vacuum pumps, vacuum lines, compression band seals, shutoff valves, stopwatches, plugs, and calibrated vacuum gages. All repair work and visible leak remediation must be completed at contractor expense regardless of leakage quantity until test criteria are met. The contractor bears responsibility for conducting repairs and retesting until results meet specification criteria, with no additional compensation provided by the owner. No specific pricing information, set-asides, incumbent vendor details, or funding sources are disclosed within this technical specification document.
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Text version
33 05 05.36 - Vacuum Testing
1.0 General
1.1 Summary
A. Section Includes: Vacuum testing of manholes.
B. Related Requirements:
1. Section 33 05 61 - Concrete Manholes: Requirements for sewage and stormwater manholes.
2. Section 33 31 11 – Public Sanitary Sewerage Gravity Piping: Pipe materials, manholes, and accessories normally encountered with gravity sewerage piping.
1.2 Reference Standards
A. ASTM International:
1. ASTM C1244 - Standard Test Method for Concrete Sewer Manholes by the
Negative Air Pressure (Vacuum) Test Prior to Backfill.
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: The Contractor shall indicate results of manhole tests.
D. Qualifications Statement:
1. The Contractor shall submit qualifications for applicator.
2.0 Products
2.1 Vacuum Testing
A. Equipment:
1. Vacuum pump.
2. Vacuum line.
3. Vacuum Tester Base:
a. Compression band seal.
b. Outlet port.
4. Shutoff valve.
5. Stopwatch.
6. Plugs.
7. Vacuum Gage: Calibrated to 0.1 in. Hg.
3.0 Execution
3.1 Examination
A. Section 01 73 00 – Execution Requirements: Requirements for installation examination.
B. The Contractor shall verify that manholes are ready for testing.
C. The Contractor shall verify that manholes are backfilled.
3.2 Field Quality Control
A. Section 01 40 00 – Quality Requirements: Requirements for inspecting and testing.
B. Manhole Testing:
1. Repair both outside and inside of joint to ensure permanent seal.
2. Test manholes with manhole frame set in place.
3. The Contractor shall follow these steps and procedures for Vacuum Testing:
a. Comply with ASTM C1244.
b. Plug pipe openings; securely brace plugs and pipe.
c. Inflate compression band to create seal between vacuum base and structure.
d. Connect vacuum pump to outlet port with valve open, then draw vacuum to 10 in. Hg.
e. Close valve.
f. Manhole Test Duration in Seconds:
1) Manhole Diameter of 4 Feet: 60.
2) Manhole Diameter of 5 Feet: 75.
3) Manhole Diameter of 6 Feet: 90.
4) Manhole Diameter of 8 Feet: 120.
g. Record vacuum drop during test period.
h. If vacuum drop is greater than 1 in. Hg during testing period, repair and retest manhole.
i. If vacuum drop of 1 in. Hg does not occur during test period, manhole is acceptable; discontinue testing.
j. If vacuum test fails to meet 1-in. Hg drop in specified time after repair, repair and retest manhole.
4. If unsatisfactory testing results are achieved, the Contractor shall repair manhole and retest until result meets criteria, at no additional cost to the
Owner.
5. The Contractor shall repair visible leaks regardless of quantity of leakage at no additional cost to the Owner.
END OF SECTION
| 1.1 Summary |
| A. Section Includes: Vacuum testing of manholes. |
| B. Related Requirements: |
| 2. Section 33 31 11 – Public Sanitary Sewerage Gravity Piping: Pipe materials, manholes, and accessories normally encountered with gravity sewerage piping. |
| 1.2 Reference Standards |
| A. ASTM International: |
| 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: The Contractor shall indicate results of manhole tests. |
| D. Qualifications Statement: |
| 1. The Contractor shall submit qualifications for applicator. |
| 2.0 Products |
| 1. Vacuum pump. |
| 2. Vacuum line. |
| 3. Vacuum Tester Base: |
| a. Compression band seal. |
| b. Outlet port. |
| 4. Shutoff valve. |
| 5. Stopwatch. |
| 6. Plugs. |
| 7. Vacuum Gage: Calibrated to 0.1 in. Hg. |
| 3.0 Execution |
| 3.1 Examination |
| A. Section 01 73 00 – Execution Requirements: Requirements for installation examination. |
| B. The Contractor shall verify that manholes are ready for testing. |
| C. The Contractor shall verify that manholes are backfilled. |
| 3.2 Field Quality Control |
| A. Section 01 40 00 – Quality Requirements: Requirements for inspecting and testing. |
| B. Manhole Testing: |
| a. Comply with ASTM C1244. |
| f. Manhole Test Duration in Seconds: |
| 1) Manhole Diameter of 4 Feet: 60. |
| 2) Manhole Diameter of 5 Feet: 75. |
| 3) Manhole Diameter of 6 Feet: 90. |
| 4) Manhole Diameter of 8 Feet: 120. |
| h. If vacuum drop is greater than 1 in. Hg during testing period, repair and |
| retest manhole. |
| i. If vacuum drop of 1 in. Hg does not occur during test period, manhole |
| is acceptable; discontinue testing. |
| j. If vacuum test fails to meet 1-in. Hg drop in specified time after repair, |
| repair and retest manhole. |
| 4. If unsatisfactory testing results are achieved, the Contractor shall repair manhole and retest until result meets criteria, at no additional cost to the Owner. |
| 5. The Contractor shall repair visible leaks regardless of quantity of leakage at no additional cost to the Owner. |
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