Guidance for using plastic pipes in drains
Pipe shall be delivered to the development site and handled by means which provide adequate support to the pipe and does not subject it to undue stresses or damage. When handling and placing plastic pipe, care shall be taken to prevent impact blows, abrasion damage, and gouging or cutting (by metal surfaces or rocks). All special handling requirements of the manufacturer shall be strictly observed. Special care shall be taken to avoid impact when the pipe must be handled at temperatures of 40oF or less.
Pipe shall be stored on a relatively flat surface so that the barrels are evenly supported. Unless the pipe is specifically coated to withstand exposure to ultraviolet radiation, it shall be covered with an opaque material when stored outdoors for a period of 15 days or longer.
When laying the underground drainage pipe the following rules should be followed.
Plastic pipe conduits and fittings shall be installed as shown on the drawings. The pipe shall be laid so that there is no reversal of grade between joints, unless otherwise shown on the drawings. The pipe shall be placed with the bell end upstream, unless otherwise specified. The pipe shall be carefully placed on the bedding or into the pipe trench.
Care shall be taken to prevent distortion and damage during unusually hot (over 90oF) or cold weather (under 40oF). After the pipe has been assembled in the trench, it shall be allowed to reach ground temperature before back filling to prevent pull out of joints due to thermal contraction.
The pipe ends and the couplings shall be free of foreign material when assembled. During the placement of the pipe, each open end of the pipeline shall be closed off by a suitable cover or plug at the end of work on the pipeline each day and until work resumes or installation is complete.
Perforated pipe shall be laid with the perforations down and oriented symmetrically about the vertical center line. Perforations shall be clear of any obstructions when the pipe is laid. Pipe shall be firmly and uniformly supported throughout the entire length. Bell-holes shall be made in the bedding under bells or couplings and other fittings to prevent the pipe from being supported by fittings.
When earth bedding is specified, the pipe shall be firmly and uniformly bedded in a shaped bedding groove that closely conforms to the bottom of the pipe for a depth equal to a minimum of 1 inch or 5 percent of the diameter of the pipe, whichever is greater. The earth bedding material shall be free of rocks or stones greater than 0.5 inch diameter and earth clods greater than 2 inch diameter
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