Page 429 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Steam Turbines and Turboexpanders 407

Note: Ensure bottle is seated on level adjuster crossarms.

6. Tighten knurled thumb screw to secure bottle in the lower reser-
voir.
Pressure Lubrication

Details of pressure lubrication systems vary widely. Each system is de-
signed to meet the turbine application requirements. Factors such as the
type of driven equipment, operational and environmental conditions and
individual preferences in the selection of various components, may affect
the specific design of the system.
Pressure lubrication systems are generally similar in that each employs
a pump to draw oil from a reservoir and deliver it under pressure to the
bearings and other parts requiring lubrication. The oil then drains by
gravity flow back to the reservoir to be recirculated.
In most cases, the oil supply piping contains an oil filter, oil cooler and
a pressure control device. Twin oil coolers, filters, and transfer valves
are sometimes used in the pressure lubrication system. This arrangement
allows the cooler or filter to be isolated for maintenance or repairs with-
out shutting down the system.
Various types of optional monitoring, control and safety devices can be
used with pressure lubrication systems. Among these devices are pres-
sure and temperature indicators, auxiliary pumps, alarms and emergency
shutdown devices.

Governor Lubrication

This segment provides lubrication, operation and maintenance instruc-
tions for a typical small turbine governor. This governor system employs a
Woodward, Model TG-10, Mechanical Hydraulic Speed Control Governor
as shown in Figure 8-18.
The governor is bolted to an adapter which is mounted in the steam end
bearing housing. The governor driveshaft is coupled to the trip body by a
flexible coupling. The governor valve lever, adjustable connecting rod,
and terminal shaft lever connect the governor rotary terminal (output)
shaft to the governor valve.
The TG-10 governor has a self contained oil reservoir with a 1.75
quart (1.7 liter) capacity. A breather, located on the top of the governor,
vents the reservoir and also serves as a plug for the oil filler hole. An oil
level sight glass on the side of the governor indicates the operating oil
level. A reservoir drain plug is located in the governor end cover.