220
The Service Module: Service Bays
223
SERVICE BAYS
In its simplest form, each service module will contain a service bay which
houses all the basic equipment for the three service subsystems and all
vertical service distribution to and from the module. The vertical
distribution includes all supply services from the central plant and all risers
and shafts to roof-level equipment or outlets.
The concentration of all vertical services within the service bay area will
leave the functional zone free for planning and replanning without the
traditional impediment of service stacks. Locating all service equipment
here too also frees the functional zone, and simplifies the organization of
the service zone where access and space for equipment would be more
complex and cause problems of industrial safety.
223.1
TYPICAL ARRANGEMENT
The components of the service bay are the mechanical room, exhaust
shafts, electrical room, plumbing and normally an escape stair. All these
areas will be entered at the functional zone level. Any required crossover
of services from equipment or risers to align with service zone main
distribution, such as HVC header ducts or electrical and plumbing runs,
must take place within the service bay to avoid overcrowding of the near
end of the service zone (See Figure 220-3.)
The service bay will always be located on a side of the service zone
parallel to the beams, so that the main service distribution into the service
zone is made perpendicular to, and directly under the beams.
The mechanical room will contain typically the air-handling unit for the
service module with a direct inlet through an external wall for outside air
supply, and the general return/exhaust fan. The exhaust shafts will
include general exhaust, and toilet and special exhaust, leading to roof
mounted fans. The plumbing risers will include the pressure systems,
The electrical room includes all the electrical and communications
equipment such as transformers, related switchgear and branch circuit
panels, etc., for the service module.
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