GENERAL ELECTRIC GENERATING PLANTS Part 8 docx

MIL-HDBK-1003/11

9.2 Single-Level Diesel-Electric Generating Plant Layout. The single-story

slab-on-grade layout is the usual design for smaller electric-generating

plants (1,000 kW capacity and smaller). This layout may also be used for

larger capacity generating plants where special conditions dictate the use

of a single-level installation. All auxiliaries and support facilities are

located on the same level. Single level construction requires more floor

area. Trenches must be constructed in the slab for major piping runs. Such

trenches become awkward for larger generating capacity plants with several

units installed in parallel. Engine-generator sets are usually set on

separate foundation blocks and are isolated from the floor slab. Some

smaller skid mounted units may be set on isolators and bolted to floor

slabs.

9.3 Two-Level Diesel-Electric Generating Plant Layout. Two-level

installations consist of an upper level engine operating floor and a lower

level for major auxiliaries. This type of layout is most applicable to

larger units installed in parallel. Such plants require less site are than

do single level plants and the operating floor is kept relatively clear of

obstructions.

9.3.1 Two-Level Plant with a Basement. The operating floor is at ground

level and major auxiliaries are installed in a below-grade basement area.

Gratings are usually provided along sides and at the front of the engines to

aid in ventilation and to provide access for maintenance of the units

and the lower level auxiliaries.

9.3.2 Two-Level Plant with a First Floor at Grade. The layout is

basically the same as the two-level plant with a basement. The only major

exception is that offices and support facilities are normally located in the

second (raised) level. The two-story arrangement has some advantages over

other layouts in lighting and in ventilating features. A significant

advantages in avoiding the dangers of flooding which prevail in basement

type installations located in wet climates. Where weather conditions

permit, portions of the first floor may remain open. However, consideration

must be given to plant locations in proximity to noise-sensitive areas and

facilities.

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