Specifications

16201-6
L:\wpb_\wpb_emp1\W1200.13\p.m. Project #1\SECTION 16201-Indoor Generator and ATS.doc
and braced to prevent weight or thermal growth from being transferred to
the engine. Flexible expansion fittings shall be provided to accommodate
thermal growth. Support dampers and springs shall be included where
necessary to isolate damaging vibrations. All exhaust system piping,
installation hardware and materials, insulation materials and installation of
the entire exhaust system shall be provided by the Installing Contractor.
D. The exhaust silencer (muffler) shall be “hospital” grade to provide
extreme noise attenuation for environments with low background noise
where slight noise emissions would be objectionable. The silencer shall
be aluminized steel body construction, prime painted with high
temperature finish coating and manufacturer rated and capable of up to 35-
40 dBA attenuation at between 125 and 2000 Hz octave band center
frequencies. The silencer shall incorporate installed inlet and outlet ASA
flanges and configured as shown on the Contract Drawings. The silencer
shall also be furnished with inlet and outlet weld on type ANSI companion
flanges with gaskets and bolts/nuts and an appropriately sized stainless
steel bellows type engine expansion flex connector for connection to the
engine. Any required extension/spool piece piping connection from the
exhaust flex to the installed muffler shall be furnished and installed by the
Installing Contractor. The silencer’s exhaust inlet flange location on the
silencer shall be configured so as to fit and be properly installed in the
generator room space available.
E. The silencer shall be furnished with a N.P.T. drain fitting. The exhaust
piping from the muffler shall be extended horizontally and with a slight
pitch downward and away from the generator to discharge engine exhaust
gases and to facilitate exhaust silencer and piping drainage. The Installing
Contractor shall provide and install stainless steel construction manual
isolation shutoff drain valves and carbon steel piping drain lines in the end
of the muffler and at the low point in the exhaust piping and piped by the
Installing Contractor to a readily accessible location beneath the muffler.
Appropriately rated high temperature resistant gaskets shall be utilized for
all exhaust system flanged connections.
F. The Installation Contractor shall be responsible to confirm and provide
documentation indicating that the physical size and construction of
muffler to be furnished shall be adequate to properly locate and install the
muffler and associated exhaust piping system, including insulation in the
generator room with the generator set in its installed location. The exhaust
muffler installed inlet shall be relocated as necessary and shall be
constructed with manufacturer approved physical locations of the
muffler’s inlet and outlet location on the muffler.
G. Exhaust piping from the muffler shall be stainless steel and shall be
extended to outside of the building as shown on the Contract Drawings.
The exhaust piping shall be routed through the building structure through