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02/22/99 113:01 1,10.736 D04 <br /> 9 Repair procedures Cutting repaircouplings <br /> (Cont. on 2-inch coupiings the center doles have been located near the middle of the <br /> coupling.Cut exactly between these two holes.The resuRing half-couplings are <br /> I inches long,Two cuts are necessary when staking 3-and 4-inch ham-couplings, <br /> The resulting half-couplings are 51h inches long. <br /> D � i p <br /> O 0 0 <br /> .` <br /> O 0 "10 a <br /> Fig.9-8.Cut fulf-fertgth coupfings so Cut na mains2 tract+ ; <br /> thatait bolt holesonhaplcoW s ttalt•eouplires Cutmmake3 <br /> are equidistant from the ends. Wd+-Irons <br /> nalt•raup6ngs <br /> 0 <br /> Primary system Recommended practices <br /> testing Pian tests carefully and can them out with all due precautions.Pressurizing <br /> equipment should be suited to the size of the system and the pressure required w d <br /> should be operated by qualtried and experienced personnel only. <br /> r--------------------- ---------� <br /> I The following recommendations are offered only as a guide.Ameron assumes no I <br /> 1 responsibility or I''Lablk for the consequences of any testing practices. 1 <br /> L----------..,...... ----- ---J <br /> • Pressure sources should be capable of approaching test pressure gradually. <br /> • Use gauges with a full-scale reading of no more than twice the test pressure:Do <br /> not use a 100 psi gauge for a 10 psi test.Use reliable gauges calibrated against <br /> a dead weight tester and zeroed for atmospheric pressure. <br /> • Isolate tanks from the piping when pressure testing. <br /> • The recommended hydrostatic pressure is 1509 of expected operating <br /> pressure and should be maintained at least 10 minutes. <br /> • Do not exceed 150%of system rating.Check the pressure rating of ail the <br /> components of ttiesystem -+lot just the pipe—because hoses and flexible <br /> connectors are aimost always rated lower than the pipe. <br /> • Do not adjust fittings while system is under pressure.If threaded adapters or <br /> bushings Wa:<.release the pressure before attempting to toten. <br /> • 7emperature changes can affect the pressure in the test line.Substantial <br /> pressure increases may occur in closed systems exposed to the sun. <br /> Conversely,overnight decreases in pressure due to cooling from afternoon to <br /> early rooming are no mid and do not necessarily indicate a leak, <br /> • After testing.maintain 5 to 10 psi(35 to 70 kPa)in the system during subsequerrt <br /> construction so that damage caused by stakes,excavation equipment,etc.can <br /> be detected and corrected before pavement is installed or product is pumped. <br /> r y <br /> Arneron recommends hydrostatic testing of primary systems as the effects of <br /> sudden pressure less when testing with liquids are far less severe than with gases, I <br /> I If pneumatic testing is necessary,restrain the system adequately to prevent <br /> damage orirjury in case of rapid pressure loss_Pneumatic testing can be <br /> I extremely dangerous and is not recommended. <br /> L----------------------------- <br /> 75 <br />