Severn Trent VAX4600 Series, Инструкция по эксплуатации

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115.6001.10 - 16 -
3 OPERATION
3.1 General
This section covers the operating practices of the Series VAX4600 Vaporizer System, consisting of one
vaporizer, one pressure relief valve, one (optional) pressure reducing valve and one or more liquid line
expansion chambers.
3.2 Pre-startup Components
3.2.1 Vaporizer
Apply power to the vaporizer control circuit to energize the automatic water level control and actuate
the water fill solenoid valve. Open the manual water shutoff valve allowing the water bath tank to fill.
3.2.2 Gas Pressure Relief Valve and Rupture Disc Assembly
The relief valve is calibrated at the factory to open at 250 psig (1700 kPa/17 bar). No additional
adjustment is required. Be sure the manual bypass valve is closed before introducing chemical into
the system. See Bulletins 115.6020 and 115.3004.
3.2.3 Pressure Reducing Valve (Electric and Pneumatic)
See Bulletin 115.6010. Check for operation by actuating the low water temperature alarm switch
(reduce water bath temperature) and observing the valve operation (PRV is opened above the low
water temperature alarm set point and closed below the set point).
3.2.4 Liquid Expansion Chamber Rupture Disc Assembly
See Bulletin 115.3005
3.3 Startup
All persons involved in the operation of the vaporizer equipment should be familiarized with its operation and
any plant emergency procedures. Before continuing with the startup, contact Capital Controls with questions
or to arrange a training program, if necessary.
3.3.1 Start-Up
a. Turn on the power to the heaters (control circuit already on) and allow the water bath
temperature to stabilize. This may take 60-90 minutes.
b. Before introducing chemical into the system. all joints and connections must be checked for
leakage. Make sure that the flexible connector is attached to the gas discharge valve on the
chemical container. Note: It is recommended that, if used, the vacuum ejector be operating as a
precaution to evacuate gas in case of a major leak.
1. Leakage test method with dry air or nitrogen:
aa. Close the manual vent valve (See Figure 6) and pressure test the liquid piping and
vaporizing chamber to 150 psig (1035 kPa/10 bar), with dry air or nitrogen.
Caution: Nitrogen cylinders are pressurized in excess of 2000 psig (13970 kPa/139
bar). Use regulator to assure proper pressure.
Apply soapy water to the outside of the joints to detect leaks. If there are no apparent
leaks, open the manual vent valve to relieve nitrogen pressure and then close.
bb. Open and immediately close the chemical container gas outlet valve, introducing
just enough gas to pressurize the chemical system. Test for leaks by filling a
squeeze bottle 1/4 full of household ammonia. Hold the squeeze bottle near the
suspected points and squeeze the fumes. If gas is leaking, a dense white smoke will
appear. Repair all leaks and retest. Reference Chlorine Institute Chlorine Manual and
Pamphlet #6.