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The Series 71V3000 electrically-heated
vaporizer automatically vaporizes and superheats
liquid chlorine, sulfur dioxide or ammonia at a
rate controlled by the gas feed system. The vaporizer
is designed and fabricated in accordance with Section
VIII, Div. 1 of the ASME Boiler and Pressure Vessel
Code, and is provided with an ¡°L¡± stamp to meet
the pressure vessel requirements of the code.
Series 71V3000 also meets the recommendations of
the Chlorine Institute. The vaporizer is housed
in a corrosion-resistant and attractive, high impact
polystyrene cabinet identical in size and color
to the cabinet of
our floor mounted gas dispensers.
Series 71V3000 vaporizer satisfies the testing
and inspection requirements necessary to meet
Part UW-2 of the ASME code which covers vessels
built to contain lethal substances. |
| The ¡°L¡±
stamp provides a chamber with the following
certi fi ca tions: |
| W-L |
Welding meets
lethal gas requirements. |
| S-L |
Fabricated
using seamless pipe for lethal
gas. |
| HT |
Whole vessel
has been postweld heat treated. |
| RT-1 |
Complete vessel
satisfies the full radiography
requirements (100%) of all welded
joints for lethal substances or
design pressures exceeding 50
psi (345 kPa) |
|
|
 |
|
 |
¤ıHeavy Construction: 1/2 inch wall
thickness of the vaporizing chamber exceeds the
ASME Code by more than ¤ı50%.
¤ıEfficient: Design affords excellent water circulation
by natural convection; no circulating pumps or mixers
are
¤ırequired.
¤ıAutomatic: Water chamber temperature is automatically
controlled by a digital electronic temperature
¤ıcontroller.
¤ıConvenient: Minimum attention is required by operating
personnel.
¤ıFor Vaporization of Chlorine, Sulfur Dioxide or
Ammonia.
¤ıRanges to 10,000 PPD (200 kg/h).
¤ıHeavy Construction.
¤ıEfficient Water Circulation Design.
¤ıAutomatically Controlled Water Temperature.
¤ıUser-Friendly Operator Interface.
¤ıAutomatic Solid State Controlled Cathodic Protection. |
The vaporizer
is es sen tial ly a vaporizing chamber surrounded
by a water jacket. The water is heated by an elec
tric immersion heater, ther mo statically controlled
to maintain a constant tem per a ture. Liquid
chlorine, sulfur dioxide or ammonia enters the vaporizing
chamber through the inlet tube and is piped to the
bottom of the vaporizing chamber. After it emerges
from the tube, the liquid absorbs heat from the
hot
water and vaporizes. The vaporrises to pass out
of the chamber through the gas outlet. Prior to
discharge from the chamber, the vapor is superheated
by being forced against the hot chamber wall by
the superheat baffle.
The vapor demand of the gas feed system automatically
regulates the level of liquid inside the vaporizing
chamber. As vapor pressure inside the chamber increases,
the rate at which the liquid enters the vaporizing
chamber decreases. If the demand for vapor increases,
the pressure inside the chamber decreases, permitting
liquid to enter the chamber at a higher rate. An
equilibrium condition is soon achieved where the
rate at which the liquid is being converted to gas,
exactly equals the rate at which liquid enters the
vaporizing chamber.
A low water level switch is wired to shut-off the
heater should the water level drop to a preset low
level in the water jacket. An automatic pressure
re duc ing and shutoff valve, controlled by the
water low temperature and low water level switch,
is installed in the gas line to the dispensing system.
This valve will au to matically close when the water
chamber temperature falls below a preset limit or
the water level drops below its low setpoint, preventing
liquid from entering and flooding the gas dispens
ing system. A pressure relief valve, installed in
the gas discharge line, operates when the pres sure
within the gas chamber exceeds safe limits.
An optional diaphragm pro tect ed pressure switch
will give a contact closure when the system pressure
emergency vent exceeds the design pressure of the
rupture disc. |
Gas
Pressure Relief Valve
The Model BM-4060 (chlorine) BM-4060-1
(sulfur dioxide)* gas pressure relief valve
is a safety device installed in the vaporizer
discharge line to relieve excessive gas pressure.
A pressure relief valve of this type is required
for vaporizer installation
to meet ASME code, Section VIII for Unfired
Pressure Vessels. It also satisfies the recommendations
of the Chlorine Institute.
*For ammonia, consult factory. |
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|
Operation
The pressure relief valve is factory set to open
at 250 psig (1724 kPa). Therefore, as long as the
gas pressure within the vaporizer remains at a safe
level, the valve will remain closed. However, if
the gas pressure should rise above this level, the
valve will open and gas will be vented until the
pressure falls below the factory setting.
Pressure Relief Valve:
Materials Handled:
Chlorine or sulfur dioxide gas or any gas or mixture
compatible with the materials of construction listed
below
Materials of Construction:
¤ıSeat: aluminum silicon bronze: silver plated
¤ıBody: Low carbon steel
¤ıSpring Bolt: Glass-filled Tefl on
¤ıValve Plug: Kynar and silver
¤ıSpring: Silver plated carbon steel
¤ıO-Ring: Vit |
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Technical
Data Series 71V3000 - General
| Capacity
and Service |
| Model |
Chlorine |
Sulfur
Dioxide |
Ammonia |
Heater
Element Size |
| lb/day |
kg/h |
lg/day |
kg/h |
lb/day |
kg/h |
| 71V3_3 |
6000 |
120 |
4500 |
85 |
1500 |
30 |
12 KW |
| 71V3_2 |
8000 |
160 |
6000 |
115 |
2000 |
40 |
15 KW |
| 71V3_1 |
10000 |
200 |
7500 |
140 |
2500 |
50 |
18 KW |
|
 |
| Electrical immersion heater High impact
polystyrene cabinet PVC foam insulation Stainless
steel water chamber Gas pressure gauge (psi and
kPa) Gas temperature gauge (¡ÆF and ¡ÆC) Super-heat
baffle ¡°L¡± certified vaporizing chamber Water level
sight gauge Water low level switch Digital electronic
temperature controller Water low temperature contact
Electronic cathodic protection system |
 |
| 220/440 or 240/480 Vac, 1 phase (12
kW only) or 3 phase standard for the heater elements.
120 Vac @ 0.5 amps required for the control circuits.
Other voltages optionally available. |
 |
Hydrostatic
Test Pressure: 825 psig (5.7 mPa)
Design
Pressure: 550 psig at 212¡ÆF (3.8 mPa at 100¡ÆC)
|
 |
| Pressure
reducing and shut-off valve Pressure relief valve
Safety Head and Rupture Disk Magnetic contactor
|
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Water level
control switch Constant water feed rotameter with
integral control valve.
Liquid expansion tanks |
 |
| 900 lbs (408
kg), 86 ft3 (2.4 m3) |
 |
 |
| The vaporizer
shall be of the electrically heated type, with the
water chamber temperature controlled by an integral
electronic temperature controller. The vaporizer
shall automatically vaporize and superheat liquid
________ at a rate controlled by the using system
and shall have a capacity of ______ pounds per 24
hours of _____ gas. The electrically heated vaporizer
shall be Capital Controls Series 71V3000, or approved
equal.
The vaporizing chamber shall be constructed of Schedule
80 welded steel pipe having a minimum wall thickness
of ¨ö-inch. All fittings and flanges shall be forged
steel. The chamber shall be designed, constructed
and tested to conform to the lethal substances section
of the ASME Code, Section VIII, for unfired pressure
vessels. The chamber shall be supplied with an ¡°L¡±
Certification which includes the following additional
stamps: ¡°W-L¡± welding meets lethal gas requirements;
¡°S-L¡± fabricated using seamless pipe; ¡°HT¡± whole
vessel has been post-weld heat treated; and ¡°RT-1¡±
complete chamber satisfies the full radiography
requirements (100%) of all welded joints for lethal
substances. The vaporizing chamber shall be hydrostatically
tested at 825
PSIG. A gas pressure relief valve complete with
a safety head/rupture disc and pressure switch with
diaphragm protector shall be provided for emergency
pressure relief. The water jacket shall be constructed
of stainless steel. The water heater shall be of
the three-element, electric immersion type, ___kW
maximum capacity, designed for _____ VAC, ____phase
operation. The electric heater shall be mounted
in the lower
portion of the water jacket to insure proper heat
distribution by natural convection. No additional
circulating apparatus shall be required. The water
chamber shall include both an integral overflow
and a vapor vent. A magnetic contactor shall be
required for operating the heater. The interior
of the water chamber and the exterior of the vaporizing
chamber shall be protected from corrosion with an
automatic solid state electronic cathodic protection
system. The unit shall be equipped with a front
panel-mounted electronic temperature controller,
a water level sight gauge, and gas pressure and
temperature gauges. A water level switch shall be
provided for low alarm and for shut down of the
heater and closure of the electrically actuated
gas pressure reducing valve in the event of low
level in the water chamber. The temperature controller
shall close the gas pressure reducing and shut-off
valve in the event of low water temperature. The
temperature controller shall have a direct reading
digital display and alarms for high and low water
temperature. Dry contacts for alarms shall be provided
for actuation of both local display and remote annunciation.
All control circuitry shall be 120 V, and shall
be factory pre-wired to customer terminal strips.
All controls and level switches shall be rated NEMA
4X.
The vaporizer shall be housed in a corrosion-resistant,
high impact polystyrene cabinet that shall be completely
removable for service. The unit shall be supplied
with PVC closed-foam insulation for the water chamber
in order to conserve energy. The gas pressure relief
valve shall be a normally closed valve which shall
open on increasing pressure at 250 psig. Upon decreasing
pressure, the valve shall close. It shall be constructed
of materials suitable for use with ( ___) gas and
be provided with 1¡± NPT internal threaded connections.
This valve shall be supplied with a safety head/rupture
disc and a diaphragm protected pressure switch. |
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