Matematicas

Water Technologies

Wallace and Tiernan®

Gas Feed System

Series 50-200 Evaporator

for Liquid Cl2, NH3, or SO2

Key Benefits:

Reliable Automatic operation

Easy to install-shipped completely

assembled

Accurate, reliable monitoring of

operating conditions

Meets ASME and Chlorine Institute

code requirements

Automatic pressure relief of gas

outlet and liquid inlet standard

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The Wallace and Tiernan® Series 50-200 Evaporator

(sometimes called a “vaporizer”) is an electrically

heated, immersed tank-type heat exchanger. It is

necessary wherever the required rate of gas withdrawal

cannot be satisfied by direct connection to multiple

containers. 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

Aluminum fluxing (removal of magnesium)

Treatment of cooling water in power plants

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Features

Reliable, Automatic Operation

To help prevent overfilling, the liquid

level in the pressure cylinder is selfadjusting.

Level in the water-bath tank

is maintained by a solenoid that 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

(212° F), causing pressure build-up that

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 pressurerelief

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.

Weather-Resistant

The evaporator enclosure is made of

rugged, pressure-formed ABS panels.

An optional, gasketed ABS rear cover

added to the enclosure makes it weather

resistant. This arrangement is ideal for

outdoor service, especially at power

plants.

Meets Code Requirements

The Wallace & Tiernan® Series 50-200

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-

Water-level sight glass is at left of panel.

Left side of panel has indicator lights

for high-water temperature (red), lowwater

temperature (amber), and at

bottom, low-water level (red). At top are

gas temperature and pressure gauges.

Meters in center of panel are for water

temperature and cathodic protection

control, and the power-disconnect

switch is at the right of the panel.

relief valve comply with ASME Boiler

and Pressure Vessel Code, Section VIII,

Division I.

Pre-Wiring

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