15.4.3 Platforms and Ladders. Provide platforms with ladders at
alllocations requiring access for operation, maintenance, and cleaning for
systems that are more than 4 feet (1.2 meters) above the ground floor.
Connect long platforms to two means of egress or ladders.
Systems and access doors need only ladders for
Toe guards and railings shall be provided on
15.4.4 Cranes and Hoists. See NAVFAC DM-38.01, Weight-Handling Equipment
and Service Craft; for types and design criteria and also Section 5.
15.5 Typhoon and Seismic Considerations. Interior and exterior mechanical
equipment and systems should be anchored, braced, or guyed (as required) to
withstand the wind loads (pressures) and seismic zone lateral accelerations
specified for design of structures. Seismic design shall comply with
criteria and requirements indicated in NAVFAC P-355, Seismic Design for
15.5.1 Piping and Raceway Systems. All systems should be designed to
permit freedom of movement of the pipes or raceways caused by expansion and
contraction but shall contain their lateral movement due to seismic
occurrences. Penetration through building walls and floors should be made
through sleeves, and with swing joints or other means of permitting
independent pipe or raceway movements. All piping or raceways critical to
the operation of the plant should be steel or other structurally strong
materials, if possible, in lieu of brittle materials, such as plastic or
cast iron. Materials containing asbestos shall not be used.
15.5.2 Equipment. All mechanical and electrical equipment and tanks should
be securely anchored to their foundations. Supports for equipment should be
steel in lieu of cast iron where practicable.
15.5.3 Controls. Control systems should be designed so that loss of the
control media (air, hydraulic, or electric) will leave the control in a
fail-safe position, capable of being operated manually.
and Department of Defense (DOD) 4270.1M, Construction Criteria Manual, for
15.6.1 Heating Diesel-Electric Generating Plant Buildings. Buildings for
prime duty and standby/emergency duty diesel-electric generating plants
should be heated and ventilated. Refer to NAVFAC DM-3.03, Heating,
Heating and ventilating systems for control rooms, switchgear rooms,
offices, and critical parts storage should be provided with a system
separate from the main engine-generator and auxiliary room system.
220.127.116.11 Exhaust Gas Heat Recovery. Prime duty generating plant building
and process heat should be provided by exhaust gas heat recovery boilers
where economically feasible. Where the heat recovery boilers do not provide