totally enclosed fan cooled; equipped with 120 volts space heaters; and
control shall be in accordance with NEMA ICS 1. The lubrication system
shall be completely piped and wired with only interconnecting piping
between the console and the pump required in the field.
2.3.1.10
Splash Oil Lubrication System
A simple splash lubrication system shall be provided with each bearing
having its own oil reservoir integral with the bearing housing. Proper oil
level shall be maintained by a constant level oiler located on each bearing
housing. A slinger shall be provided on the shaft to splash oil into the
bearing when the compressor is running. A sight level gauge shall be
provided in the bearing housing. A labyrinth seal combined with an
atmospheric vent shall be provided to prevent oil contamination of the air
stream.
2.3.1.11
Inlet Guide Vanes
Inlet guide vanes shall be provided for each single stage centrifugal
blower.
2.3.1.12
Centrifugal Blower Speed Increasing Gears
High speed, single stage centrifugal gears shall be made of hardened,
helical, alloy steel, manufactured in accordance with AGMA 6011with a
minimum 1.5 service factor applied to full horsepower rating of blower.
2.3.2
Positive Displacement Blowers
**************************************************************************
NOTE: Blowers should be identified on the drawings
by type and operating characteristics.
**************************************************************************
2.3.2.1
Performance and Design Requirements
Blowers shall be positive displacement rotary, oil-free types, designed for
continuous duty. Performance and design requirements shall be as shown.
2.3.2.2
Casing
Blower casing shall be one piece with separate head plates and shall be of
close-grained cast iron, suitably ribbed to prevent distortion under the
specified operating conditions. Casing shall be fabricated with lifting
eyes for installation and maintenance purposes.
2.3.2.3
Impeller and Shaft
The impeller and shaft shall be a common ductile iron casting. Impellers
shall be of the straight, two-lobe involute type and shall operate without
rubbing, liquid seals, or lubrication. Peak vibration velocity of blower
shall be less than 7.62 mm/second 0.30 inch/second.
2.3.2.4
Timing Gears
The impellers shall be positively timed by a pair of machined,
heat-treated, spur tooth timing gears. Timing gears shall be mounted on
the impeller shafts on a tapered fit and secured by a locknut.
SECTION 11375A
Page 14
Previous Page
