Frequency Band
Maximum Acceptable
(Hz)
Pressure Level
(Decibels)
31
[____]
63
[____]
125
[____]
250
[____]
500
[____]
1,000
[____]
2,000
[____]
4,000
[____]
8,000
[____]
2.7
AIR INTAKE EQUIPMENT
Filters and silencers shall be provided in locations that are convenient
for servicing. The silencer shall be of the high-frequency filter type,
located in the air intake system as recommended by the engine manufacturer.
Silencer shall be capable of reducing the noise level at the air intake to
a point below the maximum acceptable levels specified in paragraph SOUND
LIMITATIONS. 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
**************************************************************************
NOTE: Include on the drawings a detail of the
exhaust piping that penetrates building construction
such as walls or roof.
**************************************************************************
The system shall be separate and complete for each engine. Piping shall be
supported so as to minimize vibration. Where a V-type engine is provided,
a V-type connector with necessary flexible sections and hardware shall
connect the engine exhaust outlets.
2.8.1
Flexible Sections and Expansion Joints
A flexible section at each engine and an expansion joint at each muffler
shall be provided. Flexible sections and expansion joints shall have
flanged connections. Flexible sections shall be made of convoluted
seamless tube without joints or packing. Expansion joints shall be the
bellows type. Expansion and flexible elements shall be stainless steel
suitable for diesel-engine exhaust gas at the maximum exhaust temperature
that is specified by the engine manufacturer. Expansion and flexible
elements shall be capable of absorbing vibration from the engine and
compensation for thermal expansion and contraction.
2.8.2
Exhaust Muffler
**************************************************************************
NOTE: Muffler locations and mountings shall be
shown on the drawings.
**************************************************************************
A chamber type exhaust muffler shall be provided. The muffler shall be
constructed of welded steel and designed for [outside] [inside] [vertical]
SECTION 16264A
Page 39
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