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Recent content by DieselGuy

  1. DieselGuy

    ITT (ASCO) Hydramotor NH92 4000# Hydraulic Actuator

    We have replaced all components through the years. The shaft is center ground and chrome plated. All bushings seals and shaft materials were replaced approx 1 year ago. We have our lab performing material property testing and hardness checks. We are seeing the potential for misalignment...
  2. DieselGuy

    ITT (ASCO) Hydramotor NH92 4000# Hydraulic Actuator

    I sent them per step 3 attachment but have not been able to view them. I assume they would attach to the thread.
  3. DieselGuy

    ITT (ASCO) Hydramotor NH92 4000# Hydraulic Actuator

    The split coupling is as you noted, however is designed to allow .030" clearance and therefore should not translate sideload from the driven component unless extremely out of alignment. The application in this case was aligned within a few thousands. Thanks for your inquiries. A few photos...
  4. DieselGuy

    ITT (ASCO) Hydramotor NH92 4000# Hydraulic Actuator

    We have been experience early life failures of a NH92 Hydramotor in a valve actuator application. The mounting is vertical and in-line to within a few thousands of an inch. A split coupling is used to assure that no side loading is introduced between the actuator and valve stem. The...
  5. DieselGuy

    Predicting Bearing failure due to inner race slipage

    This is an interference fit bearing to shaft (approx 3.125"Diam). Bearing is heated and slid into place. No locking collars or set screws. We are looking into work history to find tolerances of the shaft and bearing to see if there was adequate interference fit. Most likely not. Question is...
  6. DieselGuy

    Predicting Bearing failure due to inner race slipage

    I am involved with a root cause investigation on a fan motor (100HP) bearing failure. Vibration Analysis is periodically performed (at least every 6 months) on this fan. Motor bearings had been replaced approximately 1 year prior to the failure, fan runs approximately 6 months out of a 12...
  7. DieselGuy

    Concrete degradation due to heat

    I have large diesel generators that occaisionally exhaust into a concrete enclosure. The concrete was originally specified as 5000 PSI minimum. The exhaust has plenty of exit points from the structure but the exhaust will impinge on a concrete roof approximately 4 ft from the pipe exit...
  8. DieselGuy

    Vortex breaker

    ANSI Pump Standards, 1998 Edition Standard for Pump Intake Design, indicates that the use of a (1.5" bars) grating type cube, 3 inlet diameters on each side and 6 inches minimum above the inlet pipe provides a good vortex suppression for Centrifugal Pumps. They also provide several...
  9. DieselGuy

    Ref. needed for vortexing calculations for a fuel oil eductor system

    We utilize a centrifugal pump, that draws suction from a day tank, and pumps #2 Fuel Oil through an eductor located in an underground storage tank to refill the day tank. The Day tank supplies FO to a Nuclear Standby Diesel Generator. The drive flow is approximately 100 GPM and the draw from...
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