Page 386 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Steam ltzrbines and Turboe3qMnders 365

the designated speed, shut the turbine down and make
Ifecessary adjustments as described in the “Overspeed
Trip System” section.

11. After the speed decreases by 15 percent to 20 percent of rated
speed, latch the resetting lever and bring the turbine back up to
speed. Operate the turbine for approximately one hour. Check the
bearing temperatures and turbine speed. Listen for unusual noises,
vibration or rubbing. After this period, the turbine can be shut
down, doweled to the mounting surface and coupled to the driven
machine. If the turbine is used with a speed reduction gear or other
special equipment, follow all instructions pertaining to those par-
ticular items.

Initial Startup, Pressure Lubricated Turblnes

1. Before startup, be sure that the oil pumps are primed and the oil
reservoir is filled to the proper level. Start the auxiliary oil pump
(if provided) and circulate the lubricating oil. Check the oil piping
for leaks and be sure oil is being delivered to the bearings.
2. Check the oil temperature (See: Minimum Oil Temperature Before
Starting, Table 8-5) then proceed with the applicable start-up proce-
dure for Noncondensing for Condensing Turbines.
3. After the turbine is operating, closely observe oil pressures and temper-
atures. Introduce cooling water to the oil cooler as the system warms
up. Refer to Table 8-5 for normal oil pressure and temperature ranges.

Routine Startup, Noncondensing Turbiner
1. Check all oil levels. Fill lubricators as necessary.
2. Place any controls, trip mechanisms or other safety devices in their
operative positions. Open hand nozzle valves (1, Figure 8-6), if fur-
nished.
3. Open all drains from steam lines, turbine casing and steam chest.
4. Open the turbine exhaust valve.
5. Open the steam inlet shut-off valve and bring the turbine up to de-
sired speed.
6. Close all drain valves when drain lines show the system is free of
water.
7. Make necessary governor adjustments to attain desired speed as
load is applied to the turbine. (See: Governor Operation, later.)