220
The Service Module: Size and Shape
For example: space module type 8 (See Section 233: Catalog of Space
Module Capabilities) has an overall width of 90 feet. With a three to one
ratio, the maximum length of diaphragm is limited to ten structural bays
(225 feet). Thus, no nursing floor service module based on this particular
space module type can be longer than 225 feet.
222.1.3
Fire Sections
Service modules are optimum at about 10,000 square feet as far as the
HVC subsystem is concerned, and fire sections as close to the 20,000
square foot code limit as possible are best for purposes of minimizing
obstructions by two hour fire partitions. A relatively efficient combination is
two service modules per fire section. However, in situations involving
service modules which must be larger than 10,000 square feet, which will
be the case when certain space modules are combined, the fire sections
will have to be the same size as the service module. In this event, there is
a conflict between minimizing the service module and maximizing the fire
section, in which a reasonable compromise may be in the neighborhood of
15,000 square feet.
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