33 05 05.36 - Vacuum Testing.pdf
PDF 470 KB Posted
- Attached to
- West Pump Station Replacement Project
- Solicitation number
- Not on record
- Issued by
- Chester County, Pennsylvania
About this file
This is a technical specification document for vacuum testing of sanitary and stormwater manholes, prepared by Herbert, Rowland & Grubic, Inc., in support of the West Pump Station Replacement Project being undertaken by Northwestern Chester County Municipal Authority in Pennsylvania. The specification outlines requirements for vacuum testing of newly constructed or repaired manholes prior to backfilling, including mandatory compliance with ASTM C1244 standard testing procedures. The work requires a testing contractor with a minimum of three years' experience in performing vacuum testing services. Submittals must include testing procedures, equipment lists, testing sequence schedules, provisions for water disposal, and calibration certifications prior to commencement of testing activities. The specification establishes test duration requirements based on manhole diameter (60 seconds for 4-foot diameter, 75 seconds for 5-foot diameter, and 90 seconds for 6-foot diameter structures) with an acceptance criterion of no more than 1 inch of mercury vacuum drop during the specified test period.
The specification requires use of calibrated vacuum testing equipment including a vacuum pump, compression band seal apparatus, vacuum gage, plugs, and shutoff valve. Testing procedures mandate that pipe openings be plugged and braced, a compression band be inflated to create a seal between the vacuum base and structure, and vacuum be drawn to 10 inches of mercury before the valve is closed for the timed test period. Any manhole exhibiting a vacuum drop exceeding 1 inch of mercury must be repaired and retested, and all visible leaks must be repaired regardless of leakage quantity. The contractor must document vacuum drop measurements and maintain records of all test results; testing continues until all manholes meet acceptance criteria or are deemed unacceptable following specified repair and retest procedures.
View the file
Other files
Show 40 more
Latest 50 of 171 listed here. See the rest on GovTribe.
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
33 05 05.36 – VACUUM TESTING
Herbert, Rowland & Grubic, Inc. 33 05 05.36 - 1 000483.0450
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 01 30.86 – Manhole Rim Adjustment: Raising or replacing of designated manhole rims.
2. Section 33 05 61 – Concrete Manholes: Requirements for sewage and stormwater manholes.
3. 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: Indicate results of manhole tests.
1.4 QUALIFICATIONS
A. Testing Contractor: Company specializing in performing Work of this Section with minimum three years' experience.
PART 2 - PRODUCTS
2.1 VACUUM TESTING
A. Equipment:
1. Vacuum pump.
2. Vacuum line.
3. Vacuum Tester Base:
33 05 05.36 – VACUUM TESTING
Herbert, Rowland & Grubic, Inc. 33 05 05.36 - 2 000483.0450
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.
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 33 05 05.36
File details come from the government source that posted it. Updated .