The heater is fabricated from heavy wall seamless Schedule 40
(minimum) SA-106B or SA-53B pipe, and can, therefore, be truly regarded as a
COIL SUPPORTS :
Are outside the radiant zone, resting on a cradle within the casing. This design reduces the heat transferred
through the casing, as well as insuring long coil support life.
INSULATION AND REFRACTORY :
The heater only requires
ceramic fiber insulation (5" on end covers, 3" on
casing). This reduces the amount of
stored heat that will radiate back to the fluid on normal or emergency
shutdowns. Because the coil is
tangentially wound, the casing insulation does not experience radiant heat
and thus can be minimized.
STACK HEIGHT DESIGN :
Heaters use forced draft burners and require no stack beyond what is
required to evacuate the flue gasses from the area.
The heater is designed so that the coil can be removed without
cutting. This is accomplished with a
seal at the point the coil extends through the front and rear end covers.
The heater comes as a self-contained package, requiring only one
electrical connection, one gas connection, fluid in and fluid out. The stack and certain accessories will be
dismounted for shipment, but only to the least extent required. The burner will be mounted, and all
wiring, tubing, etc., is completed in our shop.
CASING THICKNESS :
The heater has an extra heavy 1/4" thick steel casing (minimum),
seal welded. It is gas tight and
extremely resistant to warping, erosion or corrosion. Combined with the positive furnace
pressure from forced draft firing, this eliminates the potential for tramp
air and subsequent inefficiencies.
FILM AND TUBEWALL TEMPERATURES :
The heater uses a helical coil
design featuring constant bend radius and constant velocity from inlet to
outlet. It is, therefore, very easy to accurately control fluid film
temperatures and tubewall temperatures to very low levels.
COIL EXPANSION CHARACTERISTICS :
The helical coils will have a gradual and homogeneous expansion rate
over their entire length, eliminating thermal stresses. This, combined with
the stitch welding of the loops, will provide a tight furnace and prevent
bypassing. Bypassing results in
higher emissions and lower efficiency.
BURNER DESIGN :
The heater uses a single forced draft burner. The forced draft design allows accurate
control of air/gas ratios through its range.
Part load or low load efficiencies are higher than at full load. Stack temperature remains relatively
constant through the usual operation range, to prevent flue gas
condensation. Initial setup and
operation is very simple and requires minimal adjustment. Changes in ambient temperature and
barometric conditions have very little effect on burner operation.
HTH HEATECH INC . head office is located in Calgary,
Alberta, and has sales and full service capability for all makes and models
of boilers, burners and control systems, from both Calgary, and our branch
office in St. Bruno, Quebec.