Case Study: Preventing Reactor Feed-water 1X Vibration by the Addition of Axial Clearance in the Rotating Assembly
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1 Case Study: Preventing Reactor Feed-water 1X Vibration by the Addition of Axial Clearance in the Rotating Assembly Joseph A. Silvaggio, Jr. Fellow Engineer Pump Projects and Engineering
2 CASE STUDY PRESENTATION OUTLINE 1. Description of the Siemens Demag Delaval Feed Water Pump 2. Design Fundamentals of This Type of Pump 3. 1X Vibration 4. Conventional Causes of 1X Vibration 5. The Non-Conventional Root Cause of 1X Vibration 6. Elimination of the Root Cause 7. Conclusion Page 2 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
3 1. DESCRIPTION OF THE SIEMENS DEMAG DELAVAL FEED WATER PUMP 1. Description of the Siemens Demag Delaval Feed Water Pump Page 3 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
4 SINGLE STAGE NUCLEAR FEED WATER PUMP Maine Yankee Atomic Power Company Largest Nuclear Feed Pump Ever Built 24 Nozzles 28,000 GPM 14,763 HP 700 PSI SUCTION 1,800 PSI DISCHARGE Driven By A Delaval Steam Turbine Page 4 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
5 NUCLEAR FEED PUMPS IN THE SHOP Page 5 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
6 TURBINE DRIVEN REACTOR FEED PUMP Page 6 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
7 VISUALIZATION OF PUMP HEAD PRESSURE VS. NYC SKYLINE A. Pump Head Pressure ~7570 ft ( m) B. One World Trade Center ~ ft (541.3 m) C. 432 Park Avenue ~ ft (420.3 m) D. Two World Trade Center ~ ft (411.6 m) E. Hudson Yards North Office Tower ~1292 ft (393.8 m) F. Empire State Building ~ ft (443.2 m) G. One Manhattan West ~ ft (370.6 m) Page 7 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
8 2. DESIGN FUNDAMENTALS OF THIS TYPE of PUMP 2. Design Fundamentals of This Type of Pump Page 8 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
9 SIEMENS DEMAG DELAVAL NUCLEAR FEED WATER PUMP Page 9 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
10 DOUBLE SUCTION :- NORMALLY REFERS TO THE DESIGN OF IMPELLER INLET :- THE IMPELLER HAS TWO (DOUBLE) INLET EYE AREAS :- ½ OF THE TOTAL PUMP INLET FLOW ENTERS EACH SIDE OF THE IMPELLER :- PRIMARILY USED ON SINGLE STAGE PUMPS Page 11 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
11 ORIGINAL ROTOR ASSEMBLY Page 12 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
12 A NUCLEAR FEED PUMP ROTOR ASSEMBLY Page 13 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
13 3. 1X VIBRATION 1X vibration is a vibration that has the frequency of running speed. This type of vibration was observed on the running reactor feed water pump when run at operating temperature and design conditions. Page 14 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
14 4. CONVENIONAL CAUSES OF 1X VIBRATION A. Imbalance in the rotating assembly. B. Coupling Unbalance. C. Driver rotor unbalance. D. Structural Resonance or Looseness. Page 15 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
15 5. THE NON-CONVENTIONAL ROOT CAUSE OF 1X VIBRATION a. Initiated a program to determine the root cause. b. First attempts were to investigate the conventional causes. All did not seem to be the cause initially. c. The major pump characteristic was determined to be the elevated temperature of the running pump. d. A hypothesis was developed that the differential thermal expansion between the sleeves and shaft could cause the rotor to bend (kink) to cause a 1X vibration. Page 16 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
16 6. ELIMINATION OF THE ROOT CAUSE e. An axial clearance was added between both shaft sleeves and the impeller to prove or disprove the hypothesis described in d. to eliminate the 1X vibration. f. After implementing the axial clearances as described in e., the 1X vibration was eliminated. Page 17 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
17 6. ELIMINATION OF THE ROOT CAUSE Page 18 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
18 7. CONCLUSION The lack of the axial clearance between the shaft sleeves and impeller was determined to be the root cause of the 1X vibration. To eliminate this cause of 1X vibration, all reactor feed-water pumps were supplied with this axial clearance. Page 19 1/5/2017 Joe Silvaggio Copyright Siemens Demag Delaval Turbomachinery, Inc All rights reserved.
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