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042,,22/99 18:Z�7 NO.0?6 P21 9 Repair procedures Cutting repair couplings (cont.) Or 2-inch couolings the canter holes have been located near the midcle of the -oupiing.Cat exactly between thesa two holes.liw resulting half-couplings are 7 inc,nes lorg.Two cuts are necessary when making 3-and 4-inci^haft-couplings. The esulting hail-cuplings are 51h inches long. 0 of o 0 —'-- ----------'"`---moi--' ,^-----�--�—'—"— --r Fig.?6.Cut full-lenge,coupfings so C'jt to make 24=h that ail bolt holes on half-coupGngs Curtornaka s- are eourctistant foam the errds. and 4.61ch half- oupfings 10 Primary system RecoramndedPractioos testing Plan tests careful y and carrythem out with ail due precaunons.Pressuwr zing equipment should be suited to t.e size of the system and ttie pressure required and should be operated by qualified and experienced personnel only. r••---------------------•----------, The following recommendations are offered only as a guide.Arneron assumes no I responsiladity cc liability`or tt-e corsequences of any testing practices. L--- ------------------ --------Oft J • 'ressure sources should be capable of approaching test pressure gradually. • use gauges with a full-scale reading of no more than wipe the test pressure:Do riot use a 1 CO psi gauge for a 10 psi test.Use reliable gauges calibrated against a dead weight tester and zeroed`or atmospheric pressure_ • Isolate tanks from the piping when pressure testing. • The recommended hydrostatic preassure is 150%of expected Operating pressure and should be maintaired at least 10 minutes. • Do not exceed 15C%of system rating.Check the pressure rating of all the components c(,,*system—not lust:he pipe--because hoses and flexible connectors are almost always rated tower tan the pipe. • Do rot adjust�Itt rigs while system is under pressure. f threaded adapters or busnirgs lean,release the pressure before attempting to tighten. • TE rmperarure changes can affect the pressure in the test line.Substantial pressure uxreases may occur in cased systems exposed to the sun. Conversely.overnight decreases r pressure due to cooling from afternoon to early morning are normal and do not necessarily indicate a leak. • Aft.er testing,-.-mintain 5 to 10 psi C�5 to 70 kPa)it the system during subsequent ccnstructicr,so that damage caused by stakes,excavation equipment,etc_can bedetected and corrected before pavement is installed or product is pumped. r------------------------------ -- Hmeron recommends hydrostatic testing et primary systems as the effects of I sudden pressure'css when testirg with liquids are far less severe than with gases. J 1 pneumatic testing is recessary,restrain the system adequateiy to prevent damage or atiury in case of rapid pressure toss.Pneumatic testing can oe I axtremefy cangercus and is,^at recommended, L--------------------------------J 'S