2.3.6.8
Speed Increaser
The speed increaser shall be an integral part of the compressor unit and
shall include the main drive shaft and bull gear. The main drive shaft
shall be supported through anti-friction bearings.
2.3.6.9
Intercoolers, Aftercooler, Bypass Cooler, and Oil Coolers
Intercoolers, aftercooler, bypass cooler, and oil cooler shall include ASTM
B 111/B 111M admiralty brass or other corrosion resistant tubes in ASTM B
171M ASTM B 171 admiralty or steel tube sheets and baffles for optimum
cooling and fouling resistance using [fresh] [_____] water. Provide an
intercooler between stages of compression factory assembled on unit base
with piping. The aftercooler shall be mounted on the unit base.
Intercoolers, aftercooler, bypass cooler, and oil cooler shall be factory
tested at 1.5 times operating pressure. External intercoolers and
aftercooler shall be constructed in accordance with ASME BPVC SEC VIII D1
requirements and be ASME code stamped for 1034 kPa (gage) 150 psig working
pressure. Intercoolers and aftercooler shall be capable of one piece
bundle removal. Intercoolers and aftercooler shall be equipped with an
integral or direct connected moisture separator with condensate trap
assembly. Design intercoolers and aftercooler for 11 and 8 degrees C 20
and 15 degrees F approach, respectively; however, the approach temperature
used to size the coolers shall be reduced if required to meet aftercooler
maximum air outlet temperature specified. Nonstandard coolers shall be
provided if required to meet the aftercooler maximum air outlet temperature
requirement. All coolers shall be of counter-flow design, with a fouling
factor of 0.002 for both sides of the coolers.
2.3.6.10
Lubrication System
Include an integral sump, positive displacement pump, oil cooler, and twin
filter\strainer (readily replaceable cartridges while operating). Provide
a prelube lubrication oil pump for start-up and standby for hydrodynamic
bearings or if required by the compressor design. System shall be factory
assembled and tested. Lubricating oil shall conform to recommendations of
the compressor manufacturer. Spray lubricate drive gear, anti-friction
bearings, and timing gear in each stage. Pressure lubricate hydrodynamic
bearings. Provide the oil sump with a level indicator and drain and fill
connections.
a.
Prelubrication pump, if required, or motor-driven main lubrication
pump shall be sized by air compressor manufacturer for the
requirements of the system, but shall meet the following
requirements. Pump shall be positive displacement gear pump
separately mounted with motor on a common base plate with drip lip
and drain.
(1) Performance: Pump shall have separate safety valve bypass
set at [_____] [172 kPa] [25 psi] above peak expected pressure.
(2) Materials shall be hardened steel gears and shaft, cast iron
case, bronze bearings, mechanical seal.
(3) Flexible coupling with shaft guard shall be provided, except
that these items are not required for a close-coupled pump.
(4) Motor shall be NEMA MG 1, Design A or B, Class B insulation,
of open drip-proof type. Furnish combination type starter for
SECTION 15215N
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