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30�1,100 ^ontfnued. <br />300-16 <br />Any eracks, defeetive pipes a�• ga�ket�, fittings, valves or h dr <br />discovered in oon�equenQe of the testing shall be removed and reanas <br />bY the contraetor With sound mat�rial irt the manner provided andpthe � <br />test shall be repeated unti1 sati9factory to th� engineer, <br />Servico pipes ma� �e tes�ed at the time of the tore oi <br />HQr�ever! the tes�ing of sea�vic� pip�s may be eompleted���as�e arate <br />operation from the main testing and, if' sQ� ti�e hydro�tatic test <br />pressure shall be 100 psi. The leak test sha11 b� p�rformed visually <br />�t the time of installatinn and th�r� �hall be no �,ea1,�s. <br />Electrieai Cond_ u_ ��y�� gest <br />The contractor shall perform a conductivi�� t��� w�xthin one week on <br />completion of pressux� testing or the main an �,il ira�r� p�p� W�termains <br />to establish that eleetrical thawing may� be ca�r��.e� ��t �_� thE I'Utu�re <br />Conductivity testing must be carried out in the Eng.�neex��� p�-es�nce <br />approval before a�eeeptan�e. and <br />� The system (pipe],ixtg' valves, fittings and hydr�aYats) sha1T be teated <br />for electrical continuity and current �:apaoi�y, <br />shall be made after the h dr�ostatic �he �'��etrical t�st <br />at normal operation y Pr�ess�re tiest az�d c,rhile the li�e is <br />� The line may be tested�inU���tionCof iconvenien�l have been. com�� <br />l leted. <br />the �ngin�er. length as appro��c� �y <br />� Direct current of 350 amperes ± 10�, siiall be <br />pipeline for� five minutes. Current floW throughSthe t�reu�h th;� <br />measured continuously �n � guitab1e anmeter and shallpremain�steady <br />� without interruption or excessive fluctuation throughout the �'ive <br />minute test period. <br />a <br />� <br />� <br />� <br />� <br />� <br />� <br />� <br />Insufficient current or intermittent current or arcingr ialdic�,ted <br />large fluctuation of the ammeter needle, shall be eviden�� of dei'eb� <br />con�aat in the pipe line. The cause shall be isolated and car�•���e�ive <br />Thereafter, the seetion in whieh the def�etive test occurred shall <br />retested as a unit and shall mse� the requirements, be <br />Sour�es of D.C, far these tests may be motor genera�ors, batteries <br />welding machines, ete. DeG, arc welding machines will , arc <br />usuat sc�urce. These �achines are availab�.e in adequ�,tercapacityefore <br />th�se tests and are eqc�ipp�d With controls for regulating the curre <br />output. All sueh equipment shall be furnish�d by the Contrac�or nt <br />subject to the approval nf the Engineer. <br />� <br />Cahles frAm the power sourc� to the section of system under te <br />be of sufficien� size to carry the test current without overheat�n hould <br />exeessive voltage drop. Usable sizes will probably be in the rar�ge of <br />?_/0 to �1/0 A,W,G, <br />Conneetions for the test shall be made at hydrants, The hydrants sh <br />be in the open position with the caps on during the test. The cab�eall <br />shall be clampecf to the top operating nut. <br />. <br />0 <br />