application data sheet hydrogen cooled generator...
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Integral Valve InterlocksApplication Data Sheet
HYDROGEN COOLED GENERATOR PURGE
Using Kirk Key Eagle Series will ensure the proper procedures are performed for a hydrogen cooled generator purge and maintain the efficiency of the electric generators and a safe working environment. By purging the rotating system with hydrogen, this reduces the drag or windage loss in the system.
Prior to start up or for maintenance, it is necessary to introduce air to provide a safe working atmosphere. This cannot be done directly into the hydrogen as an explosive atmosphere will be created with the corresponding hazards involved. To remove the hydrogen from the generator, either Carbon Dioxide or Nitrogen is purged through the system. Once the hydrogen has been purged by CO2, it is then replace with air. Kirk Key Eagle Series interlocks should be fitted to the gas control valves and incorporating the Nonlinear Transfer Unit (NLTU) will ensure the correct sequence of operations is followed.
The typical operation for a system is shown on the reverse of this page.
www.kirkkey.comProcess safety Control
Indu
stri
esPower Generation
Multi-Turn Valve Interlock
Quarter-Turn Valve Interlock
Nonlinear Transfer Unit
INITIAL SYSTEM STATUS: The Carbon Dioxide (CO2) and Air Valves are locked closed and the relevant keys held in the Nonlinear Transfer Unit (NLTU). The Hydrogen (H2) Valve is open with Key A trapped in the valve lock.
SYSTEM OPERATION: 1) When initiating the H2 Purge Operation, the
H2 Valve is closed and locked closed byremoving Key A.
2) Enter Key A into the NLTU and step the unit once to release Key B.
3) Key B is entered into the lock fitted to theCO2 Air Valve to unlock and allow it to beopened. When open, Key B is trapped andcannot be removed until the valve is closed.
4) On completion of the CO2 Air Valve purge,operation to the CO2 Air Valve is closed andlocked by removing Key B.
5) Enter Key B into the NLTU and step the unit once to release Key C.
6) Key C is entered into the lock fitted tothe Air Valve to unlock and allow the valveto be opened. When the valve is open,Key C is trapped and cannot be removeduntil the lock is closed.
7) On completion of the air purge, operationto the Air Valve is closed and locked byremoving Key C.
8) Enter Key C into the NLTU and step the unit once to release Key B.
9) Key B is entered into the lock fitted to theCO2 Air Valve to unlock and allow it to beopened. When open, Key B is trapped andcannot be removed until the key is closed.
10) On completion of the CO2 Air Valve purge,operation to the CO2 Air Valve is closed andlocked by removing Key B.
11) Enter Key B into the NLTU and step the unit once to release Key A.
12) Key A is entered into the lock fitted tothe H2 Valve to unlock and allow it to beopened. When open, Key A is trapped andcannot be removed until the valve is closed.
Interlocking Logic
Operation
Integral Valve interlocksApplication Data Sheet
Interlocking Sequences can be designed to suit any operational Requirements
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HYDROGEN COOLED GENERATOR PURGE
STEP
1
2
3
4
A
B
C
B
A B C
B
C
B
A
KEYIN
KEYOUT
SequenceControl Unit
H2 Valve CO2 Valve Air Valve
Operating Knob
The interlocking logic shown illustrates a typical generator purge valve system.Note: The KIRK Nonlinear Transfer Unit (NLTU) is a key release unit which ONLY releases keys in a predetermined sequence, the operating knob ONLY rotates in one direction to release the keys.
LegendSingle Key Valve Locked Open
Single Key Valve Locked Closed
Key Free
Key Trapped
STEP
1
2
3
4
A
B
C
B
A B C
B
C
B
A
KEYIN
KEYOUT
SequenceControl Unit
H2 Valve CO2 Valve Air Valve
Operating Knob
STEP
1
2
3
4
A
B
C
B
A B C
B
C
B
A
KEYIN
KEYOUT
SequenceControl Unit
H2 Valve CO2 Valve Air Valve
Operating Knob