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CAUTION:

This vaporizer is not for use with water or ethylene

glycol and water mixtures as the heat transfer media. Check with
your local Chromalox Sales and Application Engineer to be sure
that you are using an accepted heat transfer media in this vapor-
izer or consult PQ301.

Note:

When installing the vaporizer, allow a minimum of 3 feet for

removing heating element if, and when, necessary.

HYDRAULIC OR MECHANICAL:

Note:

The CHTVW vaporizer should be mounted so that the con-

trol box does not fall in direct sunlight.

The bed plate should be mounted on solid foundation, prefer-

ably level.

The pipe lines from the Chromalox vaporizer to the process

should be the same size as the vaporizer’s piping connections. All
piping should be arranged so that the vaporizer is not subject to
extreme nozzle loading due to thermal expansion and contraction of
pipe lines. If these instructions are not followed, cracks could devel-
op in the vaporizer where the inlet and outlet nozzles are attached.

1.

The piping of the entire system should be arranged to minimize
pockets where air may be trapped. Manual air vents or bleeder
valves should be provided at all high points in the system and
every time the flow of the condensate has to drop.

2. Condensate return systems:

A. Gravity return type:

The simplest and most easily operat-

ed type of vaporizer is one in which the condensate from the
heating equipment is returned to the vaporizer by gravity,
thus providing a system without moving parts. Such a sys-
tem is possible if there is sufficient difference in elevation
between the process and the vaporizer so the static liquid
head will counter-balance all frictional losses in the vapor-
izer, vapor piping process and condensate return piping
without flooding the heated equipment. See Figure 1 for a
typical schematic piping diagram.

B. Pumped return type:

Where there is insufficient differ-

ence in elevation between the vaporizer and the process, the
condensate must be returned to the vaporizer by a pump.

Normally, these pumps are of the centrifugal type; howev-
er, positive displacement pump may also be used. See
Figure 2 for a typical schematic piping diagram.

3. Hartford Loop – 

In gravity return systems a Hartford Loop

should be incorporated where the condensate is returned to any
point below the desired liquid level of the vaporizer.

A Hartford Loop consists of a line without valves outside of

the vaporizer connecting the vapor outlet and the condensate
inlet. The condensate return line is connected to the vapor-con-
densate line or loop at the same elevation as the lowest permis-
sible level in the vaporizer. Thus, a vacuum in the heated equip-
ment can then pull liquid from the vaporizer (or a closed valve
in the vapor line can force liquid from the vaporizer) only until
the level in the vaporizer falls to the level of this connection.
Also, the resultant liquid hammering will give warning that the
liquid level in the vaporizer is too low. (See Figure 1 below.)

4. Note:

All flange connections should be checked and tightened

if necessary. These sometimes loosen during transit.

ELECTRIC:

GENERAL

The Chromalox Horizontal Electric Vaporizer is a thoroughly

engineered pre-tested package, designed to give years of service,
virtually maintenance free if properly installed. The CHTV series
is ASME certified for 150 PSI at 750°F and is available in four
models, each with basic features that comply with the National
Electrical Code. Model CHTV has general-purpose NEMA I con-
struction and can be used where no hazards exist. Model CHTVO
is oil and dust tight as specified by NEMA XII standards. Model
CHTVW can be used where weather-resistant construction is
required and is constructed according to NEMA IV specifications.

Model CHTVX, Class 1, Group D, Division 1 is explosion-resis-
tant and is constructed to operate in hazardous or explosive areas.

WARNING: 

Vessel and pipe surfaces could achieve temperatures

higher than allowed for Class 1, Group D, Division 1 hazardous
areas. Common to all four models: OCE (open coil element) type
heating elements installed in 3”, schedule 40 seamless carbon steel
pipes; watt density on the outside of the pipe surface is 10 watts
per square inch; elements are removable without draining the fluid
in the vaporizer; requirements 208, 240, 480 and 550 volt, 3 phase,
60 cycle, 15 to 300kW.

INSTALLATION

Heater Terminal

Enclosure

Heater Terminal

Enclosure

Safety

Valve

Jacketed

Vessel

Vapor
Outlet

Hartford

Loop

Jacketed

Vessel

Liquid

Liquid Return

Liquid

Return

Pump

Condensate

Return

Tank

Vapor Outlet

Figure 1

Figure 2

Control Box Size

No. 

Control

kW

Volts

H     L     D

Circuits

Accomplished By

15

240

1 Pressure

Thru

or

30 x 24 x 8

1

Control with

30

480

1 Switch

40

240

1 Pressure

Thru

or

30 x 30 x 8

2

Control with

60

480

2 Switches

75

240

1 Pressure

Thru

or

42 x 30 x 8

3

Control with

100

480

3 Switches

1 Proportional

125

Pressure Control

Thru

480

48 x 36 x 8

4

with 4-step

150

electronic stepper

1 Proportional

175

Pressure Control

Thru

480

60 x 36 x 8

6

with 6-step

300

electronic stepper

Summary of Contents for PQ431

Page 1: ...120 3 60 1 CHTV 624 50 CHTVO 624 50 CHTVW 624 50 CHTVX 624 50 106 0 111 48 60 1450 60 204 720 144 3 72 2 CHTV 624 60 CHTVO 624 60 CHTVW 624 60 CHTVX 624 60 137 0 125 48 60 1600 75 235 500 180 4 90 2 CHTV 624 75 CHTVO 624 75 CHTVW 624 75 CHTVX 624 75 168 0 149 48 60 1900 100 341 200 240 6 120 3 CHTV 624 100 CHTVO 624100 CHTVW 624 100 CHTVX 624 100 218 0 187 48 60 2350 100 341 200 240 6 120 3 CHTV 1...

Page 2: ...necting the vapor outlet and the condensate inlet The condensate return line is connected to the vapor con densate line or loop at the same elevation as the lowest permis sible level in the vaporizer Thus a vacuum in the heated equip ment can then pull liquid from the vaporizer or a closed valve in the vapor line can force liquid from the vaporizer only until the level in the vaporizer falls to th...

Page 3: ...e vent nozzle should be opening for bleeding out the air 2 Set the thermostat at 220 F and or the controlling pressure switch at its equivalent 3 To energize the heaters turn the on off selector switch to the on position The heaters are interlocked with the level or float switch located on the vessel so that the heating element will shut off automatically in case of a low liquid level 4 Operate th...

Page 4: ...21 001 063 122121 002 316 20 063 122121 003 063 122121 004 316 25 063 122121 005 063 122121 006 316 30 063 122121 007 063 122121 008 316 40 063 122121 013 063 122121 014 316 50 063 122121 017 063 122121 018 624 40 063 122121 003 063 122121 004 624 50 063 122121 005 063 122121 006 624 60 063 122121 007 063 122121 008 624 75 063 122121 011 063 122121 012 624 100 063 122121 017 063 122121 018 1230 10...

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