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`.; <br />' <br />1 � <br />Service pipes may be te„t.ed at the time of the foregoing test, if installed, <br />at the Con�ract�r's �pti�n: Hawever, testing of service pipes may be <br />� completed as a separate cperation from main testing, and if so, the test <br />pressure shall be 100 psi, <br />� <br />Disinfection, followed by flushing, sha11 be performed in accordance with <br />Section 23061, Cuntractors ar.e cautioned tc� use extreme care in tesCin�, <br />disinfection and flushing t� prevent excessive wastin� of water since the <br />water being used is purchased from the Citv of St� Paul, Evidence of water <br />wastaQe will permit the Village to invoice the Contractor for all such wastage. <br />W-2.7 Electrical Conductivity Testing: The Contractor shall perform a conductivity <br />test on all iron pipe water mains to establish that electrical thawing may be <br />, carried out in the fut�re� C�nductivity testing must be carried out in the <br />Engineer's presence and appr�val made before acceptance. <br />� <br />The system (pipeline, valves, fittings, and hydrants) shall be tested for <br />electrical continuity and currenr capacity. The electrical test shall be <br />made after the hydrostatic pressure test and while the linQ is at normal <br />operating pressure. Backfilling sh��ll have been completed. The line m�y <br />be tested in sections of convenient length as approved by the Engineer. <br />Direct current of 350 amperes �- 10%, shall be passed through the pipe line <br />for fiv� (5) minutes. Gu�rent flow t}�rough the pipe shall be measured con- <br />tinuously on a suicable ammeter and shall remain stear3y with�ut interruption <br />or excessiv� fluctuati�n through�ut the five (S) minute test period. <br />Insufficient current or inte�mittent current or arcing, indicated by lgrge <br />fluctuation �E the ammeter n�edle, shall lae evidence of defective �lectrical <br />contact in the pipe line. "I'he cause shall be isolated and corrected. Th�re- <br />aftex, the secti�n in whicl� the d�fective test oc�urred shall be rekested <br />as a unit �nd shall. meet [he requirements. <br />Sources of direct current tcjr these tests m�y be m�+t�r ��nerat�rs, batteries, <br />arc welding mnchines, eCc., direct current a�:c weidin� machines cail.l prabab�y <br />t�e the usua 1 source . I'hese mach ines are ��va i lab 1e i n�adequa te capacity £or <br />these [ests and are eq:,ipp�d with contrals �or regtilating tt�� c�.�rrenC output. <br />All sucl� equipm�en[ sht�ll Ue f�.irr�ished by the C�ntract�r, s�►�jecC to the <br />approval of the �t7gineer. <br />Cables frpm t�1e p�wer s��urcc� c<� ci�e sccti��!t �E system under CesC should be <br />of suEficiene size t� �nrrv ct�e tes� e:��i-re�it with,��c r+v�rk'ie�tin� t+r excessi�se <br />vvLka�e dr��p. Us�U1H sizc�, will pi-�bably be in the x-sn�;e o� 2/0 eo 4/0 A.W.G. <br />Conc�ect ions f��r the tes t sha l l ba� madc r� t hyclrz�clts . 'ihe hydrants sha l l be <br />in the open pQs i[ i.: n wi th7 the cz��;: c�n dur in� the tes t. 'ihe cable sh� 11 be <br />clamped t� th� t�>p �,pei•atdnt; ii�it . <br />\0'i'1:: Aftcr Che ce.��c t1�E� hyilrant =1��11 b�.> sh�,e ��,ff �inel :a c�p <br />Ll�OS('t1L'fJ c� C311:�w l���di•�,nr. �lrat�i���;e. i��;ht.�n cap ��ft��r drai�na�;e. <br />A hua{c-c�n [vpca clir�ct curre���t �,n��net��r plaeed ��i� one of ti��� c�bles leading <br />CO tllE_' tl�'l�l'ii11C �S 8 C.'�Il\'l'lllE:il�. Illl'��It`(] �1 IllG'dSUI�lII�; c��rrent. <br />l�' - 5 <br />