9 02/18 TRENCH WIDTHS: The width of the trench at the top of the pipe should be held to the minimum required for efficient and proper installation. The reason for this is to keep the earth load on the pipe as small as possible, since, in general, the wider the trench at the top of the pipe, the greater the load on the pipe. But note that an increase in trench width above the top of the pipe, by sloping the sides or digging a wider offset trench, does not affect the earth load on the pipe. On the other hand, a trench that is too narrow will make assembly difficult and may reduce the rate and quality of installation. In addition, lack of ample room will limit the capability to properly backfill and tamp around the pipe. Although each job or portion of a job must be considered on an individual basis, as a rule, the following minimum trench widths at the top of the pipe are recommended: Minimum: one foot greater than the outside diameter of the casing. Where two or more pipes are in the same trench, use the distance between outside casing of the outer pipes plus one foot. Maximum: Use above method for minimum plus two feet. PLACING PIPE IN THE TRENCH: The SUPER TEMP-TITE pipe shall be mechanically passed into the trench. The latest state and federal safety regulations should be understood and observed. If slings are necessary use only canvas straps, no cable or chain slings shall be used. BEDDING: Bedding material should be sand or other materials free of sharp objects, heavy clods, boulders or frozen lumps as specified by the Design Engineer. The approved bedding should be used 6” under, around and over the pipe. Utilize good practices that apply to buried pressure piping. ASSEMBLY OF THE SUPER TEMP-TITE COUPLING: 1) Remove the end protection and check the pipe spigot end to be sure it is clean, and wipe with a clean, dry rag if necessary. Be certain that all the protective coating applied at the factory end cap is removed. Most solvents can be used to clean the metalized surface. 2) Be sure there is no soil around the joint which might be pushed into the joint during assembly. Dig a slight bell hole if necessary to keep the joint clean. 3) It is usually desirable to assemble the coupling onto the pipe on top of the trench, and then assemble the spigot end of the coupled pipe into the coupling end of the pipe already in the trench.