Aux Boiler - 1.0

Question 1

What are the relief valve setpoints?

Answer 1

1. # 1 @ 220 psig (Close @ 182 psig)
2. # 2 @ 210 psig (Close @ 198 psig)

Question 2

What are the 10C651 indications for the aux boiler monitoring?

Answer 2

In-service and out of service lights on 10C651 are indication of force draft fan breaker position.

Question 3

When do the Fuel oil transfer pumps trip?

Answer 3

They trip on a day tank high level or million gallon tank low level.

Question 4

What system can cause a boiler to trip?

Answer 4

Loss of service air.

Question 5

How is the standby boiler kept warm?

Answer 5

With heating coils that use steam from the running boiler.

Question 6

Function of the STBY 2 switch.

Answer 6

1. Fuel oil pump starts on low pressure (130psig) and runs for 30 minutes after signal clears.
2. Feed pump starts on low pressure (135psig) and runs for 30 minutes after signal clears.

Question 7

What are the conditions that cause a boiler trip?

Answer 7

High Drum Pressure (200#)
High Furnace Pressure (-16”H20)
Low Combustion Air Press (-11.5’H20)
Low Atomizing Air Pressure (88#)
Low INST Air Pressure (60#)
Low Atomizing Media to F/O D/P (3#)
Low Oil Pressure (75#)
Lo-Lo Primary Drum Level (5” <norm)
Lo-Lo Aux Drum Level (5.5” <norm)
Loss of Power
FD Fan Motor Trip
Guns Uncoupled
Burner Trip

Question 8

What are the loads that the boiler supplies steam to?

Answer 8

• Plant Heating
  Heating Units
  N2 Vaporizer
  Domestic Hot Water
  CST
  RW
• Offgas Recombiners Preheater
• HPCI/RCIC Testing
• Sealing Steam
• SJAE
• Condenser Heating & Dearator