2.6.2
Vibration Isolation and Seismic Restraints
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NOTE: Provide seismic requirements and show details
on the drawings if the Government designer (either
Corps office or A/E) is the Engineer of Record.
Delete the bracketed phrase in the last sentence of
this paragraph if seismic details are not provided.
Properly edited sections 13080 and 15070 must be
included in the contract documents.
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The maximum engine vibration in the horizontal, vertical, and axial
directions shall be limited to 0.15 mm 6 mils peak-peak RMS, with an
overall velocity limit of 24 mm/sec 0.95 inch/sec RMS.[ A
vibration-isolation system shall be installed between the floor and the
base. The vibration-isolation system shall limit the maximum vibration
transmitted to the floor at all frequencies to a maximum of [_____] [_____]
peak force.][ The engine shall be provided with a vibration-isolation
system in accordance with the manufacturer's standard practice.]
Vibration-isolation systems shall be designed and qualified (as an integral
part of the base and mounting system) to the seismic forces specified.
Where the vibration-isolation system does not secure the base to the
structure floor or unit foundation, seismic restraints shall be provided in
accordance with Section 13080 SEISMIC PROTECTION FOR MISCELLANEOUS
EQUIPMENT and Section 15070A SEISMIC PROTECTION FOR MECHANICAL EQUIPMENT
[and as shown on the drawings].
2.7
AIR INTAKE EQUIPMENT
Filters and silencers shall be provided in locations that are convenient
for servicing as shown on the project plans. The silencer shall be of the
high-frequency filter type, located in the air intake system as recommended
by the engine manufacturer. A combined filter silencer unit meeting
requirements for the separate filter and silencer items may be provided.
Expansion elements in air-intake lines shall be [copper][rubber].
2.8
EXHAUST SYSTEM
The system shall be separate and complete for each engine. Exhaust piping
shall be supported to minimize vibration. Provisions shall be made for
pipe thermal expansion. Where a V-type engine having more than one exhaust
outlet is provided, a V-type connector, with necessary flexible sections
and hardware, shall connect the engine exhaust outlets. The exhaust
connectors shall incorporate engine-mating and silencer-mating flanges,
eliminating the need for adapters. The muffler and exhaust piping together
shall be capable of reducing the noise level at the exhaust discharge
location to a point below the maximum sound levels specified in paragraph
SOUND LIMITATIONS, at a distance of [_____] m ft from the end of the
exhaust piping directly along the path of discharge for horizontal
discharged exhaust; or at a radius of [_____] m ft from the
muffler/discharge piping, at 45 deg apart in all directions, for vertically
discharged exhausts, with the engine operating at 100 percent of service
load.
2.8.1
Flexible Sections and Expansion Joints
A flexible section shall be provided at each engine and an expansion joint
SECTION 15133A
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