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MINIMUM DOUBLE CHFGK UALVE ASSEt+ffLY <br />FOR <br />U. S. PUBLIC HEALTH SERVICE <br />�IFS3II. PIER WATERING POINTS _ SANITATION PROGAAM <br />WASiIINGTON STATE DEPARTT�NT OF HEALTH <br />OCTOBER 1954 <br />In connection uith pursgraph 2H� Puge S, of the untering facilities "Handbook on <br />Sariitation of Vessel Watering Pointa", by the U. S, Public Hoelth Servico, the <br />folloxing informotion is given on n device uhich ie acceptablo in the Stoto of <br />Weishington cs an addcd protection in the event of an illogol water connection be- <br />tween ship-a.yd-shore whcrc�in excoss pressure abocrd ship might otherwiso result <br />in backflov to the ahoro potable water syatom. <br />The nseor�b.ly must contnin (stnrting f}�om the public aupply sido): <br />1) Test hoso bib °A�� � <br />2) Gnte Valve 'nB�� <br />3) Tont hosc bib °C�� <br />4) A horizontal swing typa choc;c vcil.ve'"D�� h�ving bruss or bronzo pins� <br />bushing cmd eec�t for elapper, all intended to avoid eorrosion and stiek- <br />ing of parta� nnd set so cluppor is closed by preasure from thc vessol <br />aide. <br />5) A test hase bibb "E" <br />6) A second horizontal check valvo "F�� _ sWse specificntion as nUove. <br />� 7) A tc�t hose bibb °G° <br />8) Gste vcilve °H° <br />(NUTE: Union shoiQd bo nrovided for ensy removrl of check valve� unless flanged <br />fii;tings nre usccl). <br />The nssembly shall be installed in n place not subject to aubmergence and all ports <br />must be c�sil;i acce�sible for inspeci;ion� tect nnd repcir. It is recommendcd that <br />where fcasible the eniirc assembly be installed nbovo ground, <br />(` _ , . `� T, � <br />T2$� i�OSt'., l.. _ _ . _ _ ,_ � � <br />Tast xose Yest Hosv <br />��,� �-, �_J�� � � Tes N�sc — _ ' .� <br />�b� p� t �-� atbn�\�. �"�; X `'' �� <br />�� �___� .1 �~1 �;i_ `Gioo /\�;�} rTiaio���� Vassel <br />'�---- 1�� 7'_.._1` ---C.�_ — r �--- ••�F--�;� <br />: _ <br />iy� � <br />�— — . . _. _ .."' <br />�. _ "_ \ <br />`�-- ' �---� � � --�- !�=� � - <br />wotic : --�•----- --- .��.. .--��--�--• �, � � <br />SuDP1Y Gate Valve •B• p�eck valve •D• Uniun Cneck Yalve •F� G¢te Valve •M• <br />AfETHOD OF TFSTING CHLCK VALVFS <br />(To bo done us needed but at least ycarly ttith n record kept of inspoctions) <br />1) Closo tiChtly vtil.ve �'B" and Valve '�H° <br />2) Open test outlot '�C° and connect test hose bibb '�A° to °E° (with hoso), <br />3) If no lecikage, then vclvc °B" ;u�d check'valva °D�� are both tight. <br />Open test hose bibb °��� �nd connect test hoso bibb °A° to "G�� (wich hoso), . <br />If no loakage check valve °F° tmd gate valvc °H° ara both tight, <br />If leuknge dooa not cease on either (2) or (3) test repeir check valvos <br />conae:ned, <br />4) If chock vulves are worked on, mako a final recheck as above. <br />• _ <br />- - _ __ ___ _ <br />. . �, <br />