MFP & Turbine

Question 1

Describe MFP seal injection

Answer 1

Injection pressure supplied by condensate booster pump header
- PCV maintains seal leakoff @ 150 psig(back Press)
- PCV maintains seal inj 30 psid > seal leakoff
Seal leakoff returns to Mn. Cond

Question 2

What are loads off of ac oil pumps?

dc oil pumps?

Answer 2

Control oil
Trip oil
Bearing oil

Bearing oil
Pump-turbine coupling

Question 3

Auto starts for MFP oil pumps?

Answer 3

ac-115 psig Pdisc of pump

dc-10 psig brng Press

Question 4

Automatic trips on MFP & setpoints?

Answer 4

Overspeed 6370 rpm (elec), 6380 (mech)
Lo-vacuum (mech), 10-15" Hg abs
Lo-brng oil Press, 10 psig (mech)
SI (elec)
P-14, 2/3 Ls/g > 90% 1/4 S/G (elec)
Hi MFP Pdisc > 1305 psig (elec)
Lo Oil reservoir, 39" below flange (elec)
Hi thrust brng wear, 20 mils (elec)
Lo HPU press, 100 psig (elec)

Question 5

Describe Woodward Hydraulic Power Unit?

Include setpoints

Answer 5

Oil skid that provides oil to positioner servos that control position of LP & HP governor valves

• two pumps, one running, one STBY, backup accumulator
• normal Press ~275 psig
• b/u starts @ 200 psig
• fwp turb trips <100 psig

Question 6

Purpose of the high pressure oil accumulator

Answer 6

Prevents MFWP low oil pressure trip from a bus transfer

Question 7

Control oil high pressure, trip oil high pressure, and bearing low oil pressure

Answer 7

Control oil high pressure 150#
Trip oil high pressure 150#
Bearing oil low pressure 20#

Question 8

How do the servo positioners work and at what pressure is delivered to them.

Answer 8

Driven by the hydraulic power unit (hpu)
Supplies nominal 275# to HP and LP servo positioners

Question 9

When does the HPU standby pump start

Answer 9

200#