Section Env-Wq 704.06 - Gravity Sewer Pipe Testing(a) All new gravity sewers shall be tested for water tightness by the use of low-pressure air tests.(b) Low-pressure air testing shall be in conformance with the following testing standards in effect at the time the test is conducted: (1) ASTM F1417 "Standard Test Method for Installation Acceptance of Plastic Gravity Sewer Lines Using Low-Pressure Air", available as noted in Appendix D; or(2) Uni-Bell PVC Pipe Association Uni-B-6, "Low-Pressure Air Testing of Installed Sewer Pipe", available as noted in Appendix D.(c) All new gravity sewers shall be: (1) Cleaned and visually inspected using a lamp test and by introducing water to determine that there is no standing water in the sewer; and(2) True to line and grade following installation and prior to use.(d) All plastic sewer pipe shall be visually inspected and deflection tested not less than 30 days nor more than 90 days following installation.(e) The maximum allowable deflection of flexible sewer pipe shall be 5% percent of average inside diameter. A rigid ball or mandrel with a diameter of at least 95% of the average inside pipe diameter shall be used for testing pipe deflection. The deflection test shall be conducted without mechanical pulling devices.N.H. Code Admin. R. Env-Wq 704.06
(See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06
Amended byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.