ASSEMBLY OF PVC GASKETED PIPE
VinylTech gasketed PVC pipe has a factory-installed rubber ring joint. This locked-in-place design prevents fishmouthing or accidental dislocation of the sealing gasket when pipe spigots are inserted in the bell joint. Do not attempt to remove the gasket from the gasket groove. The pipe-coupling gasket should be carefully inspected and cleaned to insure that no dirt or foreign matter is between the gasket and the pipe. After the pipe is placed in the trench the coupling should again be inspected to confirm that no dirt is in the gasket groove area. Pipe lubricant should be placed on the gasket face and on the spigot end of the pipe to the insertion line. Make certain the pipe end is supported off the ground so the lubricant does not pick up dirt. The pipe then should be inserted into the bell, aligned, and carefully pushed past the gasket. The spigot insertion mark is a “reference mark” to indicate the proper depth of insertion. In a properly assembled pipe-to-pipe joint, the insertion mark is flush with the lip of the adjoining bell. Care must be taken to insure that the spigot is not over-inserted. Use extreme care when assembling gasketed pipe with bar and block method or a machine such as a backhoe to prevent joint misalignment or over-insertion. Do not swing or stab the joint together. If the pipe does not go into the bell to the insertion mark, this may be an indication of a pushed gasket. A feeler gauge can be used to determine the position of the gasket in the coupling. If pipe assembly is at the trench side and then lowered, the same procedure is followed. As the pipe is lowered into the trench, holding pressure should be exerted on the end of the pipe, thus preventing movement in the bell after insertion. The pipe should be inspected to insure no lessening of insertion depth has occurred. Usually pipe larger than 8″ diameter is assembled in the trench. Field cutting the pipe may be necessary. Square cuts are essential.VinylTech recommends the use of a wheel type cutter and a mechanical beveler to complete the cutting procedure. After the cut is made, the pipe should be beveled smoothly to the original degree of the factory bevel. Fittings are usually gasketed slip joint fittings manufactured from PVC. Care must be taken to avoid rolling or cutting the fitting gasket. The same lubrication procedure used on the pipe is recommended for placement of the fitting.
CUTTING PVC PIPE
A square cut is essential when making a field cut of PVC pipe. PVC pipe can be easily cut with a fine tooth hacksaw or a handsaw. Power type saws with steel blades or abrasive discs can also be used. It is recommended that the pipe be marked around its entire circumference prior to cutting to assure a square cut.
BEVELING PVC PIPE
After a pipe is field cut, assure that the pipe is beveled. Use a factory finished beveled end as a guide to determine the angle and the length of the taper. The end may be beveled using a plastic pipe beveling tool, a course file or rasp, or the abrasive disc power tool that was used to cut the pipe.
PVC PIPE EMBEDMENT
Proper compacting of the bedding material in the haunching area is the most important criteria to limit the deflection of a flexible PVC pipe. Embedment material should be placed and consolidated under the pipe haunch area and through the initial backfill area to provide adequate side support to the pipe while avoiding both vertical and lateral displacement of the pipe from proper alignment. Initial backfill is that portion of the pipe embedment beginning at the springline of the pipe and extending over the top of the pipe. This area should also be properly compacted to aid in limiting pipe deflection. Embedment materials suitable for proper compaction shall be used in the entire embedment zone.