support for thermal expansion shall be provided at governor end of turbine.
Turbine shall be horizontally or vertically split case with metal to metal
joints without the use of gaskets. Journal bearings shall be properly
lubricated as recommended by turbine manufacturer for operating conditions.
Anti-friction bearings shall have L-10 bearing life of [_____] hours.
Thrust bearings shall be of [ball] [tilting pad] design. Turbine blading
shall not be welded, shall be securely anchored, and shall be renewable.
Blading material shall be minimum stainless steel and shall be suitable for
steam quality and purity. Steam glands [interstage diaphragms] shall be
sealed with carbon rings or labyrinths. Turbine shaft shall be finished
with hard chrome in gland sealing zones. Turbine shall be provided with
single governor to control valve(s). Governor shall be NEMA SM 23 Class
[_____]. Hand valves shall be furnished in cases where operating
conditions will be substantially different than design or where future
operating conditions will change. Overspeed trip set at 110 percent of the
normal operating speed shall be provided. Overspeed trip shall be NEMA SM
23 Class [_____]. Manual trip lever shall be included. Turbine shall be
factory tested to check operation.
2.8.4.2
Electric Drive
Motor shall be [splashproof] [totally enclosed, nonventilated] [totally
enclosed, fan cooled] [totally enclosed, fan cooled suitable for
installation in a class II, division 1, group G hazardous location as
defined in NFPA 70]. Motor starter shall be [manual] [magnetic] [across
the line] [reduced voltage] type with [general purpose] [weather resistant]
[watertight] [dust tight] [explosion proof] enclosure.
2.8.5
Condensate Return System Control
The condensate return system manufacturer shall furnish completely wired
control cabinet, mounted on condensate return equipment or free-standing.
Cabinet shall have hinged door and include the following:
a.
Auto Lead-Lag-Off-Continuous selector switch.
b.
Pump running Pilot light.
c.
Control circuit disconnect switch.
d.
Terminal block.
e.
Control circuit transformer, fused
f.
Momentary contact Test pushbutton.
g.
Control Panel meeting the following requirements:
1.
Construction: The condensate return surge tank control panel
shall be properly sized to contain all control devices, instrument
gauges and meters. Control cabinet shall be factory assembled
steel enclosure with locking door. Panel shall be NEMA 12
construction, 11 gauge steel with key-locking vault handle, three
(3) point latches, and continuous hinge. The door shall be fully
gasketed.
2.
Wiring: Control panel shall be wired in accordance with NFPA 70
and shall have individual motor starter with 120 volt holding coil
and fuse protection. Individual green oil-tight pump run lights
SECTION 15561A
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