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Pipe installation It is recommended that 5 to 10 psi(35 to 70 kPa)pressure be maintained in (continued) the pipe during construction of the rest of the facility to monitor the integrity of the pipeline. In this way damage caused by stakes,tools, etc. can be detected and corrected before paving is installed or product is pumped through the pipe. Pressurizing equipment should be operated by qualified and experienced personnel only. Do not make any adjustments on pressurized fittings. For example, if athreaded adapter is leaking, release the pressure before attempting to tighten. The test operation should be well planned and carried out with all due precautions. Hydrostatic testing is recommended. Because liquids cannot be compressed,the effects of sudden decompression due to a component failure are far less severe with liquids than those which can occur if air is used. If it is necessary to test with air,the system should be adequately restrained to prevent damage or injury should rapid decompression occur. Warning: Pneumatic testing is extremely dangerous and is not recommended. Repairs If the damaged area is more than one inch in diameter,follow instructions for extensive damage. If the damaged area is less,follow instructions for minor damage. Extensive damage • Cut out at least one foot(30 cm)on both sides of damaged area to ensure that all affected material is removed and good pipe is available for cutting, tapering and bonding. • Taper the ends of the pipe left in place. • Dry fit sleeve couplings on each taper. • Cut and taper a pipe nipple long enough to insert fully into both sleeve couplings. Nipple length should be approximately 1h inch(12 mm)longer than actually needed in the dry fit condition.The adhesive will act as a lubricant during assembly yielding about 1/8 inch(3 mm)additional insertion perjoint. • Clean all bonding surfaces and apply adhesive to them. • Widen the gap between the ends of the pipe by temporarily bending the pipe or displacing a fitting. Install the repair pieces and make certain the pipes are brought back sufficiently to properly bond the sleeve couplings onto the pipe and pipe nipple. Use a twisting action during insertion to lock the tapers in place. Minor damage Cut a length of undamaged pipe at least 10 inches(250 mm)long. 3/4 of circumference -------------------------- r --------------------------- L I 10"(min) • Cut this pipe longitudinally twice so that a repair piece three fourths of the circumference is left. • Thoroughly sand the inner surface of this repair section and the corresponding area on the damaged pipe that it will cover. • Use coarse emery cloth to remove all gloss and roughen the bonding ® surfaces. • Use a circular carbide-tipped hole saw to cut out the damaged area and make clean edges. Use emery cloth from adhesive kit to remove any rough edges. 13