This installment focuses on the proper use of the Deformed Flexible Code. It is important to know the type of material that the pipe is made of, to determine if it is flexible, designed to deform before breaking, or rigid in construction. The codes are further described using a Modifier as follows: A Bulging Round (BR), where one or more rounded projections protrude into the pipe. A Bulging Inverse Curvature (BI), where an inward bulge is sharp crested taking on the shape of a heart point or shark fin. Creasing (C), where an outward folding of pipe wall in the longitudinal direction creates a crease in the wall of the pipe. Elliptical (E), where the round pipe is compressed into an elliptic
Cross Bore Prevention and Detection are two very serious issues. Cross Bore prevention occurs before and during the actual drilling takes place. Cross Bore Detection occurs after the drilling has occurred. Both aspects are important but the more important of the two is Cross Bore Detection. Cross Bore Prevention involves sewer mainline, and lateral CCTV, Pot Holing and traditional, trenching, installation. CCTV of the sewer mainline and laterals needs to include electronic locating of all areas of possible contact between the two utilities. Typically, all mainlines will be CCTV’ed end to end and laterals CCTV’ed to a point 5-10 feet beyond the proposed drilling path. All areas that may be in
