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INFILTRATION




Two lengths of randomly selected hubless cast iron soil pipe were joined with an MG COUPLING, torqued to 175 inch-pounds, and the ends of the assembly were sealed. After 24 hours, the assembly was submerged in water, and a vacuum of 9 inches Hg was pulled for 10 minutes. The assemble was removed from the water, wiped dry, and the interior of the pipe was inspected for leakage.
   
MG COUPLING (sizes tested) Vacuum (inches Hg) Vacuum after 24 hours (inches Hg) Results
2" 26 26 No Vacuum Loss
3" 25 25 No Vacuum Loss
4" 25 25 No Vacuum Loss
5" 25 25 No Vacuum Loss
6" 25 25 No Vacuum Loss
8" 25 25 No Vacuum Loss
10" 25 25 No Vacuum Loss