A Photogrammetric Technique for Developing Boundary Equations for Flexible Sheath Waterless Trap Seals as Used in Building Drainage Systems
The water trap seal is still the main method of protecting building inhabitants from the ingress of foul contaminated air and noxious gases from the sewer.This seal can become compromised when water is lost in the trap by processes including evaporation and siphonage from excessive system suction pressures.A recent innovation is the waterless trap