Pennwalt - Model 50-200 Series -Evaporator

Such high-capacity installations include:

• Disinfection in large municipal or industrial water plants;
• Chlorination of municipal sewage;
• Disinfection of municipal and industrial wastewater;
• Bleaching and waste treatment in pulp and paper mills;
• Aluminium fluxing (removal of magnesium);
• Treatment of cooling water in power plants.

RELIABLE, AUTOMATIC OPERATION
To help prevent overfilling, liquid level in the pressure cylinder is self-adjusting. Level in the water-bath tank is maintained by a solenoid which controls make-up water flow. A thermostat maintains hot water temperature. Alarms and readout monitor operation of the liquid-evaporation and hot water systems.

EXTERNAL HEATER
The electric water heater is external to the water-bath tank assuring uniform heat distribution. This prevents "hot spots" and minimizes the possibility of liquid being heated in excess of 100 °C causing pressure build-up which could trigger gas relief.

ALARMS AND MONITORS
A sight glass for water-bath level and a water-temperature gauge help monitor water-bath conditions. Electronic switches provide accurate and reliable water-temperature regulation. Gas pressure and temperature gauges are included. There are high- and low-alarm switches for water-bath temperature and low-water level. An automatic pressure-relief system in the gas outlet is standard. A similar relief system in the liquid-inlet line is also standard. Both systems have high-pressure alarm switches.

MEETS CODE REQUIREMENTS
The Pennwalt Evaporator conforms to ASME standards and meets recommendations of the Chlorine Institute. The pressure cylinder and water-bath tank are cathodically protected against corrosion. The tank is heavily galvanized inside and out. The pressure cylinder and gas pressure-relief valve comply with ASME Boiler and Pressure Vessel Code, Section VIII, Division I.

PRE-WIRING AND OTHER INSTALLATION ECONOMIES
Pre-wiring of all evaporator controls and components is completed at the factory and included as standard. Electrical installation requires only connecting external power to a coded terminal strip. Only one 3-phase power supply is required: a transformer in the panel supplies power for control functions. Three sets of unpowered customer alarm contacts are standard: high-water temperature; low-water temperature; low-water level.

EASY TO CLEAN
The top of the pressure cylinder is a bolted flange removable for access to the interior. A bottom connection allows the cylinder to be flushed in place. An access hole in the water-bath tank permits inspection of the cylinder exterior and the tank interior. The enclosure is easily removed for access to the evaporater interior.

EASY TO INSTALL
The evaporator is shipped completely assembled. The vapour vent and overflow drain are piped separately to insure adequate water-bath overflow. The electric heating elements are mounted from the top of the water heater Liquid-inlet connections can be made at the top or bottom. Bottom connections are required for evaporators connected to a common liquid supply.

NEMA 4 CONTROL PANEL
The NEMA 4 panel contains a single printed circuit board incorporating all control functions and unpowered alarm contacts. Control switches, alarm lights, and readouts are also on the panel. As a precaution, a fused disconnect switch for the incoming power interlocks with the panel door.