AS Direct Fired
LPG Vaporizers
• For Propane, Butane, and LPG
• Capacities from 50 gph to 480 gph
• ASME, NFPA, FM
• Two-Stage
Burner Regulator
• Manual Drain
• Powder Coated Cabinet
• Liquid Carryover
Protection
• Automatic Ignition/Re-Ignition—9VDC
• Factory Tested
What are LPG Vaporizers ?
L
A
PG vaporizers are actually boilers. Instead of boiling water, they boil propane, butane, or another
LPG (Liquefied Petroleum Gas). It may sound strange that heat is required to vaporize LPG when
propane will boil at -44 °F and butane at 32 °F, but, when LPG vaporizes by expansion alone, it
causes a refrigeration action. In applications with high LPG flow, the uncontrolled vaporization would
freeze valves and burner nozzles. Therefore, controlled heat is required to offset the refrigeration action.
How do Algas-SDI AS
Direct Fired Vaporizers work ?
L
iquid LPG supply is connected to the Liquid Inlet Valve.
A stainless steel ball is resting on the actuator for the
Liquid Inlet Valve, opening the valve, and allowing liquid
LPG to enter the Vaporization Tube. The liquid level will rise until
the stainless steel ball is lifted off the Liquid Inlet Valve Actuator
by the buoyancy effect.
LPG gas from naturally occurring vaporization is led through the
dual stage Burner Pressure Regulator and the Temperature
Control Valve to the Burner on the bottom of the unit, where it is
lit by the Burner Pilot. The hot gases from the Burner rise upward
along the Vaporization Tube. Metal fins along the Vaporization
Tube increase the heat transfer from the hot gases to the
Vaporization Tube and the liquid LPG. The LPG vapor exits
through the Vapor Outlet in the rear of the vaporizer.
Several components in the design of the vaporizers act as safety
devices:
• If the demand on the vaporizer is higher than the
vaporization capacity, the liquid level in the Vaporization
Tube would rise. This would not only close the Liquid Inlet
Valve, but also push the stainless steel bell against the
section of the Vapor Outlet inside the Vaporization Tube,
thereby closing off the outlet pipe and preventing the exit of
liquid propane through the Vapor Outlet. Only a small
amount of gas would be allowed to escape through a tiny
gap in the seat of the ball against the Vapor Outlet line,
thereby equalizing the pressure inside the Vaporization Tube
and the pressure in the vapor output line. At the same time,
the Temperature Control Valve will detect the cool liquid at
its sensor and will open the gas flow to the burner. The
increased heat stimulates the vaporization process and
returns the unit to normal operation.
•
•
1
8
2
7
3
6
4
If the pilot light should be extinguished, the integrated Burner
Thermocouple Assembly would detect the drop in
temperature and interrupt the gas supply to the burner.
If an overpressure-situation occurs, the Pressure Relief
Valve safely vents the systems to the atmosphere.
The Drain Valve located at the back of the vaporizer, and the
"Drip Leg Valve" allow the easy removal of contaminations from
the unit ("Heavy Ends").
5
1
2
3
4
5
6
7
8
Pressure Relief Valve
Burner Pressure Regulator
Drip Leg Valve
Burner Jets
LPG Vapor Burner
Manual Drain Valve
Liquid Inlet Valve
Vapor Outlet
Drawings,
Specifications
AS-50
AS-80
AS-120
A
13” (330 mm)
13” (330 mm)
13” (330 mm)
B
14” (356 mm)
22” (559 mm)
31” (787 mm)
C
11” (276 mm)
11” (276 mm)
11” (276 mm)
D
41” (1041 mm) 49” (1245 mm)
58” (1473 mm)
E
59” (1499 mm) 67” (1702 mm)
76” (1930 mm)
SPECIFICATIONS
AS - 50
AS - 80
AS - 120
Direct Fired Vaporizer with Dual Liquid Level Control and Dual Stage Burner Regulator.
Type
Vaporization Capacity
gph
50
80
120
Vaporization Capacity
kg/h
100
160
240
Design Temperature
°F (°C)
650 (345)
Design Pressure
psi (bar)
250 (17)
Test Pressure
psi (bar)
375 (25)
Vapor Tube conforms to ASME Boiler and Pressure Vessel Code, Section VIII Div 1.
Conforms to latest edition of NFPA.
Manufactured Construction
Approved for Factory Mutual (FM) or Industrial Risk Insurers (IRI) Installations.
Approvals
Dual Liquid Level Control with Liquid Carryover Protection
Pressure Relief Valve Protection (Vapor Tube)
Pilot Thermocouple
Manual Drain
Standard Safety Features
Burner Input
70,000
BTU/hr
100,000
Liquid Inlet Connection
3/4” FNPT
Vapor Outlet Connection
3/4” FNPT
Electrical Requirements
NONE
140,000
Dimensions (D x W x H)
inch
(mm )
17” x 14” x 59”
(432 x 356 x 1499)
17” x 14” x 59”
(432 x 356 x 1702)
17” x 14” x 59”
(432 x 356 x 1930)
Dry Weight
lbs (kg)
180 (82)
200 (91)
250 (115)
Shipping Weight
lbs (kg)
210 (97)
230 (105))
280 (130)
Nominal Capacity for Propane/Butane @ 0°F Liquid Temperature.
Dimensions and weights are approximate.
Specifications subject to change without notice.
Other AS Direct Fired Vaporizers from
Algas-SDI.
A
lgas-SDI manufactures AS Direct Fired Vaporizers in capacities of up to 480 gallons per hour.
These units consist of a battery of 2, 3, or 4 AS-80 or AS-120 units in a common cabinet, with all
interconnecting piping and controls installed at the factory. The units operate in parallel mode.
Safety features and other functions are identical with those of the base units AS-80 and AS-120.
Model
Capacity
Heat Exchangers
Approx. Size (D x W x H)
AS - 160
160 gph (320 kg/h)
2 x AS - 80
24” x 22” x 58”
(610 x 559 x 1473 mm)
AS - 240
240 gph (480 kg/h)
2 x AS - 120
24” x 22” x 76”
(610 x 559 x 1930 mm)
AS - 360
360 gph (720 kg/h)
3 x AS - 120
35” x 22” x 76”
(889 x 559 x 1930 mm)
AS - 480
480 gph (960 kg/h)
4 x AS - 120
45” x 22” x 76” (1143 x 559 x 1930 mm)
AS - 480
Our Address
Your Distributor
Phone
Fax
206-789-5410
206-789-5414
E-Mail
WebSite
[email protected]
www.algas-sdi.com
ASDI ASDF 050906
Algas-SDI International, LLC.
1140 NW 46th ST
Seattle, WA, 98107 USA
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