De Nora Capital Controls 71V3B Series Instruction Manual
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Contents
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- 25 - 115.6031.06) Connect a source of Chlorine, Sulfur Dioxide or Ammonia gas to the Vaporizer supply piping.DO NOT use liquid Chlorine, Sulfur Dioxide or Ammonia for leak testing since one volume ofliquid Chlorine expands to roughly 450 volumes of gas.7) Leave the first in-line valve closed. Quickly open and close the gas valve on the chemicalcontainer to pressurize the first piping section.8) Using a half-filled nozzle bottle, check for leaks by spraying the fumes only of 26° BaumeAqueous Ammonia (Ammonium Hydroxide), household Ammonia is not strong enough, on allfittings of Chlorine or Sulfur Dioxide systems. Ammonia systems can be checked for leaks byusing either sulfur tapers or moist litmus test papers. Sulfur tapers, litmus papers, andinstructions for their use are available from the Ammonia supplier.9) A Chlorine or Sulfur Dioxide leak will produce a dense white smoke. If a leak appears, openthe isolating valve (the one in-line valve that is closed) and turn on water to the ejector. Thevacuum created will evacuate the gas from the system so that the leak can be correctedsafely. Leaks around valve stems may usually be eliminated by tightening the packingnut(s). Leaks at non-permanent (flanged or coupling) joints may usually be eliminatedby retightening. Leaks at permanent (threaded) joints can only be eliminated by disassemblyand reassembly.10) Test the entire piping system in sections by repeating the same procedure. Close the nextin line valve downstream, open the upstream valve. Quickly open and close the gasvalve on the chemical container to pressurize the section and test all fittings with theappropriate method.11) Allow the system to remain pressurized overnight after it has been tested to determine if anyadditional leaks have developed. Retest all pipe joints. If no new leaks have developed,evacuate the system using the ejector. Chemical leaks become worse with time as thechemical attacks the metal at the leak.3.5 Optional Water Level ControlThe water level control pressure switch must be adjusted in the field prior to use. To properly set the levelswitch, the water jacket must be at least 155° F as indicated on the temperature controller. The switchshould be set to close the water supply solenoid when the water level reaches the overflow vent connectionon the rear of the water jacket (midpoint on the water level indicator). The indicator switch should be set toactivate the solenoid when the water level drops to the bottom of the water level indicator.If the purgemeter is provided, set the purgemeter to allow a dripping overflow from the overflow ventconnection with the water jacket at operating temperature.3.6 Controller Operation (LOVE Controller)This section provides fundamental operating procedures for the Evaporator's Temperature Controller(Controller location on the Vaporizer is shown in Figure 1).For a more detailed presentation of Temperature Controller operation and features, the Series 16CMicroprocessor Based Temperature Process Control Instruction Manual is provided separately as a referenceonly to supplement the information provided in this instruction bulletin.The 16C Temperature Controller is a full-function controller and has been pre-configured at the factory forthe intended operation of the Vaporizer. The temperature and alarm parameters have been arbitrarily setand MUST be changed in accordance with the procedure described in the start-up section of this chapter.Individual process parameter values may be set by stepping through the 16C's setup menus using thefront-panel push-buttons as explained in the next section. The controller's front panel controls andindicators are shown in Figure 10.CAUTIONThe sequences shown are the default sequences at the time of Vaporizer shipment.Should the sequences not appear as shown, the program has becomecompromised and must be corrected prior to placing the Vaporizer into service. |
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