MIL-HDBK-1191
establish and maintain the required space temperature, relative humidity,
and air changes rate, and to facilitate balancing procedures for all
systems.
8.8.6
Additions and Alterations to Existing Facilities.
8.8.6.1
Site Investigation. Designers shall conduct thorough
investigations of existing facilities to be upgraded or modified, to become
knowledgeable with facility conditions, as established by the terms of
their design contracts. This includes the need to inspect concealed spaces
(above-ceiling plenums, equipment rooms, chases, etc.) to permit evaluation
and accurate depiction of as-built conditions which can affect new work.
Design agents shall assure that this requirement is met; it is advantageous
that the expected scope of the site investigation be discussed in detail
with the designer during project prenegotiation and "kickoff" meetings.
Generally, designers should be required to directly inspect all equipment
rooms and all above-ceiling areas in such a number of locations as to
reasonably establish the existing conditions. In facilities with "hard"
ceilings, this may require the creation of a suitable number of inspection
openings: design agents shall define in Project Design Instructions the
responsibility for making and repairing such openings. Structural and
architectural building elements, as well as existing equipment, that
restrict equipment distribution space should be directly verified to the
extent reasonably practicable. The design team must recognize the economic
advantages of a detailed designer site investigation: if the designers do
not verify conditions, the construction contractor must do so, normally at
a cost premium reflected in higher bidding costs (unknown conditions) and
change orders (changed conditions).
8.8.6.2
Modifications to Existing Systems. Too often in the past,
addition/alteration project design documents have failed to provide the
detailed engineering guidance required to sustain operation of systems
serving occupied areas, leaving this engineering responsibility in the
hands of QA personnel or construction contractors. The results have
included loss of critical services, inadequate system performance, project
completion delays, and costly change orders. Therefore it is hereby
emphasized that it is the responsibility of the project designer to carry
out all aspects of the design which can reasonably be accomplished during
the design phase. Modifications to existing equipment and systems,
including temporary connections, changes to system performance, or measures
necessary to sustain service, shall be shown and described in detail in
project design documents. Designers shall evaluate the impact on existing
systems of extensions of service which increase system demand. The
locations of new connections shall clearly be shown and/or described. The
designer shall determine, and document for the design agent's information,
any project work which will necessitate a reduction or interruption of any
service to an existing, occupied area
8.8.6.3
Protection of Patients From Construction Contaminants. For
additions or alterations to existing hospitals, measures shall be provided
to minimize contamination of existing hospital areas, during the
construction period, and the associated HVAC systems serving them.
Measures to reduce the potential of contamination and nosocomial infections
include but are not limited to negative isolation of construction areas,
construction of effective dust barriers (including double barrier air locks
8-8
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