33 05 05.36 - Vacuum Testing.pdf
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- Blue Ball Water Storage Tank Painting Project
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- Lancaster County, Blawnox Borough, Pennsylvania
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This is a technical specification document for vacuum testing of concrete sewage manholes, prepared by Herbert, Rowland & Grubic, Inc. for the North Earl Street Low Pressure Sanitary Sewer Extension Project (Project No. 011361.0461) under the Weaverland Valley Authority in Pennsylvania. The specification establishes requirements for vacuum testing of manholes in accordance with ASTM C1244 standards prior to backfill. Testing must be conducted using calibrated vacuum equipment including a vacuum pump, vacuum gage (calibrated to 0.1 in. Hg), compression band seal, shutoff valve, and plugs. Before testing commences, contractors must submit testing procedures, equipment lists, testing sequence schedules, and calibration certifications. Test durations vary by manhole diameter: 60 seconds for 4-foot diameter manholes, 75 seconds for 5-foot diameter manholes, and 90 seconds for 6-foot diameter manholes. Manholes are deemed acceptable if the vacuum drop does not exceed 1 inch of mercury during the specified test period; if the vacuum drop exceeds 1 inch of mercury, the manhole must be repaired and retested. All visible leaks must be repaired regardless of leakage quantity, and any manholes failing to meet acceptance criteria after repair must be retested until results comply with specifications.
The specification mandates that both exterior and interior joints be sealed prior to testing and that all pipe openings be plugged and securely braced. The manhole frame must be set in place during testing, and the compression band must be inflated to create an adequate seal between the vacuum base and structure. Testing results must be documented in test and evaluation reports submitted to the engineer. The specification does not address pricing, bid security, contract award amounts, or project completion timelines, as these details are contained in separate bidding documents and contract provisions not included in this technical section.
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33 05 05.36 VACUUM TESTING
Herbert, Rowland & Grubic, Inc. 33 05 05.36 - 1 011361.0461
SECTION 33 05 05.36 - VACUUM TESTING
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes: Vacuum testing of manholes.
B. Related Requirements:
1. Section 33 05 61 - Concrete Manholes: Requirements for sewage manholes.
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. Certification of test gage calibration.
C. Test and Evaluation Reports: Indicate results of manhole tests.
PART 2 - 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.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 73 00 - Execution Requirements: Requirements for installation examination.
33 05 05.36 VACUUM TESTING
Herbert, Rowland & Grubic, Inc. 33 05 05.36 - 2 011361.0461
B. Verify that manholes are ready for testing.
C. 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. 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.
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, repair manhole and retest until result meets criteria.
5. Repair visible leaks regardless of quantity of leakage.
END OF SECTION
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