e.
The ends of coil valve springs shall be squared and ground to
protect the plate against damage by the spring ends.
f.
Valve hold-downs shall bear at not less than three points on the
valve cage. The bearing points shall be arranged as symmetrically
as possible.
g.
Metal valve discs or plates, when furnished, shall be suitable for
installation with either-side sealing and shall be lapped on both
sides. Edges shall be suitably finished to remove stress risers.
Valve seats shall also be lapped.
2.3.6.10
Compressor Connections
Flanged compressor connections shall conform to ASME B16.1 or ASME B16.5.
Threaded connections shall conform to ASME B1.20.1.
2.3.6.11
Intercoolers, Aftercooler, and Oil Coolers
Intercoolers, aftercooler, 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 intercoolers between
stages of compression either integral with unit or factory assembled on
unit base with piping. The aftercooler shall be mounted separately from
the unit base.
Intercoolers, aftercooler, 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 [_____] [1207 kPa (gage)] [175
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.
2.3.6.12
Lubrication System
Include an integral sump, shaft driven positive displacement pump, oil
cooler, and duplex filter/strainer (readily replaceable cartridges while
operating). System shall be factory assembled and tested. Lubricating oil
shall conform to recommendations of the compressor manufacturer. Bearings
and crosshead shoes shall be pressure lubricated. Provide the oil sump
with a level indicator and drain and fill connections.
a.
Lube oil heater: Provide thermostatically controlled electric
heater in lubrication oil sump of sufficient capacity to heat up
and maintain manufacturer's recommended oil temperature when unit
is cold at [_____] [0 degrees C] [32 degrees F] ambient. Provide
low level indicator with light for protection of the heater.
2.3.6.13
Pulsation Control
If pulsation problems exist, provide pulsation dampers or surge chambers.
SECTION 15214N
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