MIL-HDBK-1003/6
Rehabilitation Versus Replacement. If an existing plant has
2.2.5
deteriorated to the point of producing numerous outages, is becoming a safety
hazard or is not in compliance with air pollution regulations, its
rehabilitation or replacement will be determined by a life cycle economic
analysis. If replacement is determined to be the most cost effective then the
capacity of the modern plant is required to handle any additional projected
load. Necessary equipment and systems for air pollution regulation compliance
and other operating, safety or maintenance deficiencies must be included for
either the rehabilitated plant or replacement plant.
Standby Facilities. A standby facility is a facility which is
2.3
redundant to the primary facility and maintained to operate in the event the
primary facility becomes inoperable. A standby facility will be considered
only when:
a) A crucial need exists and redundant equipment and systems in
the primary facility will not provide required or necessary reliability of
continuous operation.
b) An outage could endanger life or property, or seriously
interfere with the mission of an activity.
c) The financial loss to the Government from a reasonable outage
schedule will be greater than the costs of standby equipment.
d) The consumer load is sufficiently critical as determined by
NAVFACENGCOM Headquarters (Code 04).
When a replaced plant is considered for a standby facility it shall
be made suitable for operation in conformance with safety and clean air
regulations.
Steam Versus High Temperature Water (HTW) Heating Plants. Central
2.4
steam heating plants shall be utilized unless a thorough analysis dictates
that a HTW plant is preferable. The following factors will be among those
considered in the analysis:
a) Economic advantages of thermal storage of the HTW system in
sizing of equipment such as boilers, pumps and piping.
b) Operating and maintenance costs of HTW distribution system
versus steam distribution system.
c)
Pressure and temperature requirements provided economically by
steam or HTW.
d) Cost of replacement or renovation of existing plant and
distribution system compared with construction of new plant and/or
distribution system. A comparison will be on a life cycle basis. The
analysis must indicate a system change is economical before change is made.
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