Marine High Efficiency

Helical Coil Heater

FOR HIGH TEMPERATURE HEAT TRANSFER SYSTEMS ON BOARD SHIP MHEHC complies with ABS and USCG requirements

Three-pass combustion gas flow for up to 89% net efficiency. Sixteen standard models with capacities from 1,000,000 through 24,000,000 BTU/Hr. The First Thermal Model MHEHC High Efficiency Helical Coil Heaters are designed for use with heat transfer fluids in process heating applications requiring temperatures of 250°F to 400°F.

The heat transfer surface is arranged in such a way that the flue gases are sufficiently cooled before reaching the last pass. This eliminates the need for refractory between the pipe coil and the heater shell . . . a feature that is a real plus as anyone who has experienced refractory problems in this area can testify. Shell exterior is covered with 3" insulation and stainless steel jacket.

• Flexible Design MHEHC Uses No Refractory!!!
• User specified exhaust stack locations to fit your needs. Standard is on top.
• User specified inlet and outlet fluid connection locations and inlet and outlet headers ensure uniform flow. Standard arrangement opposite of burner end.
• All controls located at the burner end.
• Compact design.
• Manways and peepsights on opposite burner end.

Design Covered by U.S. Patenet No. 4,357,910

Net Efficiency for Model MHEHC

This patented design provides the best efficiency that is economically obtainable without the addition of an external Economizer or Recuperator. However, where high fluid temperature results in high stack temperature, external heat recovery can be supplied by First Thermal Heaters.

MHEHC is available at higher temperatures. Variables become more critical at higher temperatures.
Contact First Thermal Heaters for an evaluation.

Design Advantages and Benefits MHEHC

	Patented design.
	Up to 89% net efficiency, without the addition of an external Economizer or Recuperator
	Coil is designed to maintain optimum fluid velocities through the heater, based on pumping rate required in system
	Coil life is extended due to proper length-to-diameter and conservative heat flux rate
	Coil supports are not exposed to radiant heat, eliminating costly downtime and repairs.
	No internal refractory between the coil and the shell
	Exterior shell is covered by 3" of blanket insulation with an aluminum jacket
	Shell, minimum 1/4" thick, is supported by a rigid structural steel skid
	Low stack temperatures
	ASME Code construction
	Structural steel supports are welded in accordance with AWS
	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.
	NEMA 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
	Factory-trained service personnel — available for start-up, operator training and fast emergence service
	Computer design — We are experts in the heat transfer business and can provide computer design for proper flux, film, and tubewall temperatures, velocity, delta t and delta p to stay well within the limitations of the thermal fluid and to fit your system requirements
	Wide choice of fuels — natural, mixed, manufactured, LP gas, fuel oils, and combination gas/oil firing.

High Efficiency

Our Model MHEHC heaters operate at the highest net efficiency (81% to 89% depending on operating temperature) that is economically feasible in transferring heat to a high-temperature thermal fluid. While heaters of other designs require the addition of a recuperator to achieve

these efficiencies, the First Thermal Model MHEHC provides these high efficiencies in a single package. However, should even higher efficiencies be required, a recuperator can be added to utilize the heat in exhaust gases to heat combustion air.

Low Fuel Cost Using MHEHC

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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