Liquid Tube Vaporizers

Performance You Can Count On!

From years of experience, First Thermal Heaters has a thorough understanding of the characteristics and physical properties involved in the vaporizing of organic heat transfer fluids. Because of our conservative equipment design and careful construction, backed by dependable service, First Thermal Vaporizers are universally specified for high temperature vapor phase heating for a wide variety of applications.

Temperature/Pressure Relationship of Vaporizing Fluids for Process Heating
Vapor phase process heating with organic fluids has the advantage of providing high vapor temperatures with low pressures. For example, to obtain 600°F, steam pressure would be greater than 1500 PSIG; to obtain 700°F, steam pressure would be over 3000 PSIG. By comparison, Dowtherm® and Therminol® VP-1 are vaporizing fluids with a boiling point of about 495°F. They will provide vapor of 600°F at 30 PSIG and 700°F at 91 PSIG. As a result, process heating with organic vaporizing fluids provides high operating temperatures at low pressures.

®Dowtherm is a registered trademark of the Dow Chemical Co.
®Therminol is a registered trademark of the Monsanto Co.

Look to First Thermal for experience, quality control, and dependable service! All units are manufactured in our own plant. We have a totally-enclosed sandblasting facility, NDT equipment, hydrostatic testing facilities, test area, stress-relieving furnace . . .   and the skilled technicians for any job, including complete system packaging. You can count on First Thermal to maintain your critical production specifications and timetable!

Vapor Phase Process Heating Benefits

• Simplified Systems: Systems can be designed for gravity return of condensate.
• High Heat Transfer Rates: Vapor at high temperatures will provide high heat transfer rates. This permits increased capacity, reduced equipment size and decreased time required to reach the desired product temperature.
• Reduced Fuel Costs: Heat transfer is more efficient than in direct fired process heaters. Therefore, less fuel is used to heat a comparable quantity of product.
• Precise Temperature Control: Since the temperature of the vapor is a function of the operating pressure, simple pressure controls can be used to regulate burner input on vaporizers.
• Longer Equipment Life: Unlike direct-fired process heating which reduces the life of containers because of higher metal temperatures, indirect heat transfer systems mean longer equipment life. A jacketed kettle or reactor using vaporizing thermal fluids is subjected only to controlled temperatures well within the design capacities of the metal.
• Reduced Fire Hazard: Hazards created by direct-fired heating systems are virtually eliminated by using high temperature vapor supplied by remotely located vaporizer. Combustion is safely removed from flammable product.
• Better Temperature Control: Since vapor at any given pressure is at a constant temperature, a uniform product temperature can be maintained. Product damage caused by overheating can be eliminated.
• High Operating Temperatures: First Thermal Vaporizers can operate with vapor temperatures as high as 750°F.

Efficient, Space-Saving Vertical Design

Model VHCV Two-Pass

Vertical design saves valuable plant and production space. Allows quick and easy draining of coil by gravity. Capacities from 1,000,000 to 50,000,000 BTU/Hr. produce up to 750°F vapor in flash tank. Gas, oil, or combination gas/oil firing. Completely packaged. Fully automatic.

1. Rugged steel shell
2. Coil supports located out of radiant zone
3. Structural steel sheel supports
4. ASME Code coil (Schedule-40 seamless pipe, 300 PSIG at 800°F design standard)
5. Shell insulated with 3" of patented double-stitched blanket (8# density)
6. Forced draft burner available for use with a wide choice of fuels & emission requirements
7. Bolted end plates and top access door for access to internals. Larger units access can be through the burner.
8. Peepsights for viewing flame located on top and bottom
9. Control panel mounted at convenient working level
10. ANSI 300# flanges for thermal fluid connections, or field butt-welding may be specified
11. ASME Code flash tank
12. Low level cutoff
13. Level control
14. Level control valve (returns)
15. Liquid level gauge
16. Safety valve
17. Circulating pump
18. Flow control valve (circulation)

Design Advantages - Series VHCV

Helical Coil, Liquid Tube, Forced Circulation Vaporizer

	Two-Pass Design — radiant- and convection-pass for efficient operation
	Pipe Coil — 300 PSIG at 800°F design (schedule 40 SA-106B seamless steel pipe)
	ANSI 300# Flanges — for liquid and vapor connections
	ASME Code Construction — heater and flash tank
	Structural Steel Supports — welded in accordance with AWS requirements
	Coil Supports — are not exposed to radiant heat
	Highly Effective Insulation — shell internally lined with multi-layered ceramic fiber blanket with and average K factor of 0.46 at operating temperatures
	Completely Packaged — burner, burner controls and control panel, including temperature indicators, pressure switches and fluid-flow protection - all pre-piped, wired and factory tested for proper, fully-automatic operation
	Efficient Burner — with forced-draft, low excess air and high turndown ratio, for all commercially available gas or liquid fuels
	Proportioning Control — to match normal range of heat demand. Automatic off-on operation for extremely low heat demand conditions
	NEMA 12 Control Panel — with full programming combustion safeguard (ultraviolet detection), fluid temperature and pressure controls, motor starters, relays, operating switches, and lights to indicate operating conditions
	Low Maintenance — thermal fluid does not cause scale or corrosion
	Conservative Design — increases equipment life and reduces downtime
	Large Flash Tank Vapor Chamber — assures hot, dry vapor
	Flash Tank Trim — includes low level cutoff, liquid level gauge, temperature and pressure controls/indicators, and safety valve
	Factory-Trained Service Personnel — available for startup, operator training, and fast emergency service
	Computer Design — as experts in the heat transfer business, First Thermal can provide Computer Design for each job to assure proper heat flux, fluid film and tubewall temperatures to stay well within the limitations of the thermal fluid for long fluid life and to fit your system requirements

Typical Applications for Organic Fluid Vapor Systems:

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First Thermal Heaters

1100 Industrial Blvd. Louisville, KY 40219 Phone: (800)665-4251, (502)962-2883 Fax: (502)969-9028 email: mail@first-thermal.com