Marc
designs and manufactures complete HVAC and pressurization
systems for offshore oil and gas facilities for applications
including switchgear buildings, quarters buildings, driller's
cabins, tool rooms, etc.
Air
conditioning systems are available from small room air conditioners
to large fully-redundant systems. Units can be furnished with
stainless steel construction or with full corrosion coatings
as required by the customer.
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Application
1:
A fully redundant system was required to be installed
in a Division 2 hazardous location and provide cooling,
heating, and type Z pressurization for a large switchgear
building. Space for the systems was limited to the area
between the building roof and a heliport just a few
feet above.
Two
twenty-five ton rooftop packaged units with full corrosion
coatings were designed and manufactured to meet the
application. As the heliport was located immediately
above, the air conditioners were designed to allow for
horizontal condenser air discharge. The units were ducted
together and a complete stainless steel interior duct
system was installed. Fire dampers were installed in
the ductwork at the entrance to the building.
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Application
2:
An air conditioner for a driller's cabin was required
for a Zone 1 installation. A roof top package unit was
specified.
A
ten-ton packaged air conditioner was designed and manufactured
to I.E.C. standards for Zone 1 hazardous areas. All
motors were flameproof with type "de" protection.
The compressor was a semi-hermetic belt drive type.
The controls enclosure had type "d" protection.
A certified flameproof heater was installed inside the
air conditioner. The system received complete corrosion
coatings.
A
small ceiling-mounted air diffuser was installed, and
to prevent fogging, the conditioned air was directed
towards the large glass viewing windows.
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Application
3:
Two compact through-the-wall packaged air conditioners
were required to be installed one above the other and
penetrating a fire-rated (A-60) wall. The condenser
(outdoor) sections were required to be Division 2 rated
and with an explosion proof motor.
Each
two-ton air conditioner was designed with a fire-rated
bulkhead plate with holes for bolting to a framed cutout
in the building wall.
A
transit system was provided to allow refrigerant tubing
and power cables to pass through the bulkhead plate
to and from the evaporator and condenser sections of
the air conditioner.
The
exterior portion of each air conditioner was manufactured
in stainless steel and the coil, compressor, and motor
received corrosion protective coatings.
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