Presentation is loading. Please wait.

Presentation is loading. Please wait.

Presented By: Kurt J. Weis Rotating Equipment Repair, Inc. 2015 FSRUG Hard Chrome Plating in Feedwater Pumps.

Similar presentations


Presentation on theme: "Presented By: Kurt J. Weis Rotating Equipment Repair, Inc. 2015 FSRUG Hard Chrome Plating in Feedwater Pumps."— Presentation transcript:

1 Presented By: Kurt J. Weis Rotating Equipment Repair, Inc FSRUG Hard Chrome Plating in Feedwater Pumps

2 Prep Machining (typically 0.004”-0.005” per side) 2015 FSRUG The Hard Chrome Plating Process Surface cleaning/polishing “Stop-off” of surfaces that are not to be plated. Lacquers, foils, tapes & waxes

3 2015 FSRUG Chrome Plating Process Continued… Immersion into chrome plating tank Chromic Acid Insoluble lead alloy anode Part acts as the cathode Plating rate of 0.001” per hour

4 2015 FSRUG Chrome Plating Process Continued… Finish Grinding Excellent dimensional control Tolerances as tight as +/ ” are achievable

5 Ultra Hard (65-70 HRC) High galling resistance 2015 FSRUG Hard Chrome Properties Excellent adhesion (>10,000 PSI) Adheres to a wide range of materials Steel, Stainless Steel, Aluminum, Copper, Bronze etc. High abrasion resistance Corrosion resistant

6 Dimensional restoration Bearing journals, shaft fits, impeller bores, etc FSRUG Applications in Feedwater Pumps Bearing journal damage on a high speed feedpump shaft Damage was repaired via hard chrome plating and grinding

7 How do proximity probes work? 2015 FSRUG Proximity Probes

8 Eddy Current Transducer 2015 FSRUG Proximity Probes Continued… Modulations in DC voltage directly proportional to air gap distance between probe tip and shaft surface Modulations in AC voltage directly proportional to vibration

9 Slope of linear relationship between air gap and DC voltage is strongly material dependent 2015 FSRUG Material Effects on Proximity Probes This relationship can be dramatically changed with the addition of a chromium layer

10 2015 FSRUG

11 In April 2011, a newly rebuilt Flowserve CHTA BFP trips upon initial startup due to high vibration readings 2015 FSRUG Case Study

12 Pump ran for approximately 4-8 seconds before IB proximity probe registered vibrations of 4.69 mils resulting in a trip 2015 FSRUG Case Study Continued..

13 After discussions between RER and plant engineering, proximity probe logic adjusted to subtract 2 mils to allow further readings to be taken 2015 FSRUG Case Study Continued.. Hand held vibration equipment

14 2015 FSRUG Case Study Continued.. Actual vibration registered by handheld: in/s

15 2015 FSRUG Case Study Continued.. Plant records were consulted, chrome repair during previous repair was discovered GE-Bently Nevada (vibration probe manufacturer) contacted Custom logic provided for 410SS w/ 0.020” chrome layer

16 Know the exact axial location of each proximity probe 2015 FSRUG How do we deal with this? Combat this phenomenon by allowing for a relief in the shaft where chrome is not applied

17 2015 FSRUG Delaval Tilt Pad Journal Bearings Bearing design/vibration probe location makes a relief from chrome impractical

18 If incorporation of a shaft relief is not possible, contact your proximity probe supplier, as custom logic programing is available that will account for the chrome layer 2015 FSRUG Custom Logic

19 2015 FSRUG Questions?


Download ppt "Presented By: Kurt J. Weis Rotating Equipment Repair, Inc. 2015 FSRUG Hard Chrome Plating in Feedwater Pumps."

Similar presentations


Ads by Google