For more information Click Here Vacuum testing is a quick, safe and practical way to validate manhole system integrity. Manhole sections can be tested at the precast concrete plant prior to delivery or on site prior to backfilling. When to vacuum test Many codes and specifications require that a vacuum test be performed after the manhole has been installed and backfilled. Testing after backfilling provides a degree of certainty that a watertight system has been installed. The major disadvantage is the fact that no industry standards exist for vacuum testing after the structure has been backfilled.
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A number in parentheses indicates the year of last reapproval. This test method is used for testingconcrete manhole sections utilizing mortar, mastic, or gasketedjoints. Users are hereby cautionedthat misuse or misapplication of the test criteria containedherein can cause permanent damage to the system being tested. NOTE 1—Vacuum test criteria presented in this test method are similarto those in general use. The test and criteria have been widely andsuccessfully used in testing manholes.
NOTE 2—The user of this test method is advised that no correlation hasbeen found between vacuum air and hydrostatic tests. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Summary of Practice4. Avacuum will be drawn and the vacuum drop overa specified time period is used to determine the acceptability ofthe manhole.
Significance and Use5. The values recorded areapplicable only to the manhole being tested and at the time oftesting. Preparation of the Manhole6. Hg shall be drawn on the manhole,the valve on the vacuum line of the test head closed, and thevacuum pump shut off.
The time shall be measured for thevacuum to drop to 9 in. Hg to 9 in. Hg meets or exceeds thevalues indicated in Table 1. Current edition approved Nov. Published November Originallyapproved in United States Precision and Bias8. Hg for the vacuum testcompares to a pressure drop of 0.
Hg The allowable test times for sizesabove 24 in. Therefore, usingthe appropriate Q. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Vacuum Testing Precast Concrete Manholes
ASTM C1244 - 11(2017)