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Application Note
Sentry Spiral Tube Heat ExchangerVent Condenser Application
SPD 12.1.10
Rev. 0
6/00
Many fluids are contained in atmospheric or low pressure tanks.
Regulatory agencies have
compiled a growing list of fluids with limits on the amount of
vapors which can be exhausted
into the environment. Whenever a tank is filled or the
temperature of the tank increases either
the pressure within the tank increases or gases will exit the
tank. Exiting gases will be saturated
with vapor from the tank contents. Reducing emissions from the
tank will require condensing of
the vapors prior to exhaust of the gas.
A Sentry spiral heat exchanger can be mounted either in the
piping exiting the tank or within
the tank at the outlet connection. Circulating a cold fluid
through the tubes of the heatexchanger will cool the exiting gas
and condense some of the vapors on the tube wall. When
the exchanger is mounted within the tank this condensate can
drip off of the tubes back into the
tank and reduce the vapor content of the discharge gas. If tube
side condensing is needed, a
reverse upflow manifold arrangement on the spiral can be used
which allows for the condensate
to drain back to the tank. This style is also used when special
material requirements make tube
side condensing more economic. See figs. 1 & 2.
Sentry Spiral tube heat exchangers are ideally suited for this
service because:
1. The compact design of the spiral tube heat exchanger allows
it to frequently fit within
the existing tank opening.
2. Moderate gas flow can be handled with cross flow with very
low gas side pressure drop
3. Corrosion resistant materials are frequently needed for
tubing material.
Computerized heat transfer calculation and model
selection insures a satisfactory exchanger for the desired
service. This is particularly important in vapor
condensing since many times multi-component fluids are
present and the condensing calculations can be complex.
Sentry's flexible manufacturing processes allow
optimization of the exchanger design; including tubediameter,
number of tubes, tube length and spacing.
Fig. 1
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Because of our special manufacturing techniques
and multi-product usage of stainless steel tubing,
Sentry offers the unique ability to provide a welded
304 stainless steel spiral tube bundle for the same
price as our competitor's brazed copper tube
bundle in lower pressure/temperature applicationswhere copper
would typically be used because of
cost. This provides the user with greater heat
exchanger life and expanded heat exchanger
flexibility with no appreciable loss in heat transfer.
Additionally, we specialize in spiral tube heat
exchangers with 316L stainless steel and a variety of
exotic alloy materials including Hastelloy ,
Inconel , Incoly and specialty stainless steels to
name just a few.
Sentry Spiral tube heat exchangers are available in
either bolted or all welded shell construction. All welded units
provide a significantly lower
cost than bolted units when shell side inspection or cleaning is
not essential or economic.
Standard shell construction utilizes carbon steel with NPT pipe
thread connections. Other
available materials and connections including flanged, socket
weld, butt weld or specialty
connectors are available.
ASME Section VIII Division 1 stamped heat exchangers are
available upon request
Sentry Equipment Corp PO Box 127 Oconomowoc, WI 53066Phone:
262-567-7256 Fax: 262-567-4523 E-mail: [email protected]
Web Site: http://www.sentry-equip.com
Fig . 2
