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  1. Daren Samy

    Pump seized

    Rubbing was found between casing wear ring and impeller on last stage. 01 Cooling jacket bolt & lock washer was found missing. It seems that caused stuckness. Daren!
  2. Daren Samy

    Pump seized

    5 stage barrel type horizontal centrifugal boiler feed water pump got seized during laser alignment. What could be reason ? Shaft on DE & NDE was kept aligned by chain blocks. One maintenance guru says that it could be due to reverse rotation during alignment. According to him , seizure is due...
  3. Daren Samy

    Scrapping on Bearings

    Thanks for input Daren!
  4. Daren Samy

    Scrapping on Bearings

    I have seen Turbine maintenance guys scrapping the bearings (supposedly) for oil wedge. Is there some systematic calculations for scrapping or it is just operating experience among turbine maintenance gurus ? I have worked on large pumps and motors. We donot do it and we rely on designer's...
  5. Daren Samy

    Spiral wound gaskets for use with flat face flanges

    ASME 16.20 accomodates using SWGs for raised face flanges. As per OE, In case of corrosive media, don't use it. Daren!
  6. Daren Samy

    Elbow Standard

    Extremely sorry! I could not get back in time. Elbow specs are 90° , PN 25, Standard: GD 0221-238 , A: 762 , D: 529 Butt welded seamless piping: PN 25, DN 508 , Standard:DIN 17175-79...
  7. Daren Samy

    Elbow Standard

    Degraded elbow that needs replacement OD : 529mm ID: 509mm t: 10mm (Measurements roughly taken) I am not well known to this work. I donot find this elbow size in ASME 16.9. Daren!
  8. Daren Samy

    Cleaning of perpex glass on storage tank

    There is perpex glass jar installed on the top of the acid storage. Glass jar contains silica gel. With the passage of time glass jar surface has become opaque( not clear). Now we have dismounted the glass jar but are clueless to clean it. Pls guide Daren!
  9. Daren Samy

    Pump Suction Pressure

    It seems as if inserted piece in upstream flange is neither orifice nor strainer. May be guage or transducer problem. Try to fix suction piping with rigid support because it can cause vibration, alignment and bearing pre-mature failure issues. Daren!
  10. Daren Samy

    Gland tightening torque

    Vendor has not provided torque for gland tightening of 10' control valve. Is there can be any rough idea for torque gland tightening? Many 10' valve gland tightening torques that I know vary from 20Nm to 30Nm depending on bolt size. Daren!
  11. Daren Samy

    What valve is this?

    It is stop check valve. In one sense, you can say it globe valve. Daren!
  12. Daren Samy

    high vibration acceleration levels on the DE side of a motor (two bearings)

    Please check the fits of bearings and bearing housings. I have worked for bearings related maintenance for previous 6 years. Though sufficient data can help to deduce any result but greater probability lies with wrongly maintained/installed bearing housings/bearings. Daren!
  13. Daren Samy

    High vibrations in 300kW motor during no load after tightening of foundation bolts

    It is probably soft foot problem. Daren!
  14. Daren Samy

    identify these machines

    1. First is hydraulic shear machine used to cut sheets, depends upon the application and model 2. Second is Bandsaw. Daren!
  15. Daren Samy

    Pump-Motor issue

    @Artisi ! You are angry.:) But I have limitations on data. Your opinions are worth-working. Moreover, my question was simple that over capacity motor can contribute vibration, especially in motor. But any how many answers are satisfactory. Daren!
  16. Daren Samy

    Pump-Motor issue

    There exists PM plan, call up cards and condition monitoring. @Tugboat : You may be right. It might have been kept large power motor intentionally. @LittleInch: Alignment is okay. Bearing condition monitoring is performed on regular basis. There is flexible coupling. Overhauling is performed...
  17. Daren Samy

    Pump-Motor issue

    On our site, 45KW motor is installed instead of 37KW (Pump EMR , Name plate data suggests) since commissioning. This motor-pump unit has experienced increased vibration issues for previous 10 years. Can the increased KWs of motor cause vibrations in pump-motor unit? Daren!
  18. Daren Samy

    Pump header pressure issue

    @Snickster ! Discharge pressure guages for both pumps read almost same pressure for each running pump. Issue is between header & Check Valve. After this pressure guage , there are only two valve installed installed in series before header pressure guage i.e. check valve and discharge valve...
  19. Daren Samy

    Pump header pressure issue

    @LittleInch: There is arrangement. Pump - Check Valve - Discharge valve. If one pump is running then other pump discharge valve is in closed state then oil can not reach to check valve. Possibility of check valve leakage issue does not exist. But there can be possiblity of issue in check valve...
  20. Daren Samy

    Pump header pressure issue

    There are two identical PD (gear) pumps installed. Both feed lube oil to boiler feed water pump in stand by condition. It is interesting to note that discharge pressures (pressure guage installed before check valve) on both pumps before check valve are same one they are taken independently in...

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