Page 387 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

366 Major Process Equipment Maintenance and Repair

8. Introduce cooling water to bearing housing cooling chambers to pre-
vent overheating. (Refer to Table 8-5).
9. Observe bearing temperatures and overall operation for any abnor-
mal conditions.

Routine Startup, Condensing lbrbines
1. Check all oil levels. Fill lubricators as necessary.
2. Place all controls, trip mechanisms or other safety devices in their
operative positions.
3. Drain steam lines, turbine casing and steam chest of all water, and
fully open hand nozzle valves (1, Figure 8-6), if furnished. Close drain
valves when the system is free of water.
4. Open the turbine exhaust valve, and start the condensing quip-
ment.
5. Open the steam inlet shutoff valve.
6. When the shaft begins rotating, introduce sealing steam to the pack-
ing cases.
7. Bring the turbine up to speed and make any necessary governor ad-
justments.
8. Introduce cooling water to bearing housing cooling chambers to pre-
vent overheating. (Refer to Table 8-5).
9. Check bearing temperatures and overall conditions for smoothness
of operation.

Routine Startup, Pressure Lubricated lbrbines
1. Check the oil reservoir for proper oil level. Start the auxiliary oil
pump (if provided) and circulate oil through the system.
2. Ensure that the oil temperature is 50°F to 70°F (10°C to 20°C)
before operating the turbine.
3. Place all controls, trip mechanisms and other safety devices in theiI
operative positions. Open hand nozzle valves (1, Figure 8-6), if fur-
nished.
4. Open all drains from steam lines, turbine casing and steam chest.
5. If condensing, close all drain valves when drain lines indicate the
system is free of water.
6. Open the turbine exhaust valve. If condensing, start the condens-
ing equipment.
7. Open the inlet steam shutoff valve and bring the turbine up to rated
speed. If noncondensing, close the drain valves when the system is
free of water. If condensing, admit sealing steam to the packing
cases when the rotor shaft begins to rotate.