engine which will reduce the exhaust sound spectrum by the following listed
values at a 23 m 75 foot radius from the outlet, with generator set loaded
to rated capacity and clear weather. Inlet and outlet connections shall be
flanged.
Octave Band Center Frequency (Hertz)
Minimum
63
125
250
500
1000
2000
4000
8000
Silencer
Decibels
[Residential
Class
10
25
32
30
25
25
24
23]
[Critical
Class
15
32
37
36
30
36
37
37]
[2.2.2.2
Field Installed Exhaust Piping System
**************************************************************************
NOTE: Include the following paragraph when the
engine-generator set is installed internal to a
building in lieu of in a self contained outdoor
enclosure. The designer is responsible for ensuring
that:
1. External loads from the exhaust system, such as
weight and thermal expansion do not exceed the
engine manufacturer's maximum allowed forces and
moments on the turbocharger, and;
2. The exhaust piping system pressure loss is
coordinated with the visible emission limits of the
is required.
**************************************************************************
Field installed exhaust piping shall conform to the following:
a.
Exhaust Piping: Provide flanges for connections to diesel engines,
exhaust mufflers, and flexible connections. Provide steel pipe
conforming to ASTM A 53/A 53M for each engine complete with necessary
fittings, flanges, gaskets, bolts, and nuts. Exhaust piping shall be
Schedule 40 pipe for 300 mm 12 inches and smaller, standard weight for
sizes 350 mm 14 inches through 600 mm 24 inches, and 6 mm 0.25 inch
wall thickness for sizes larger than 600 mm 24 inches. Flanges shall
be Class 150 slip-on forged steel welding flanges in accordance with
ASME B16.5, with material in accordance with ASTM A 181/A 181M, Grade
I. Fittings shall be buttwelding conforming to ASTM A 234/A 234M, with
wall thickness same as adjoining piping. Fittings shall be of same
material and wall thickness as pipe. Built-up miter welded fittings
may be used. Miter angles of each individual section shall not exceed
22.5 degrees total and not more than 11.25 degrees relative to the axis
of the pipe at any one cut. Gaskets for exhaust piping shall be of
high temperature asbestos-free material suitable for the service and
shall be ASME B16.21, composition ring, 1.6 mm 0.0625 inch thick.
Bolting material for exhaust flanges shall be alloy-steel bolt-studs
conforming to ASTM A 193/A 193M, Grade B7 bolts and alloy-steel nuts
SECTION 16237N
Page 25
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