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  1. Orga78

    Unable to detect vibration issues in slow RPM conveyor system

    Hi All, Very valuable comments and inputs indeed! Thank you. We have recently performed visual inspection of the failed bearing and found the internals were in low lubricant condition. Suspected the bearing seal had damaged for quite some time, thus the grease pumped in through the housing...
  2. Orga78

    Unable to detect vibration issues in slow RPM conveyor system

    It's a greased bearing
  3. Orga78

    Unable to detect vibration issues in slow RPM conveyor system

    Hi, What is the best practice for vibration analysis technique or method to be able to detect bearing failure symptoms in slow speed conveyor belt system? We recently had a bearing failure in one of our vertical chain conveyor system. Our route-based vibration measurement did not spot any...
  4. Orga78

    FMEA Risk Priority Number (RPN) - what is the minimum threshold to rank the RPN as "High Risk&q

    Many thanks both Greg & Ted for your inputs. I share similar views as well that there shouldn't be a magic number to restrict what failure modes should be prioritized based on its RPN, but to focus on the inherent or un-mitigated risks (S x O) as the FMEA workshop concludes the RPNs.
  5. Orga78

    FMEA Risk Priority Number (RPN) - what is the minimum threshold to rank the RPN as "High Risk&q

    Hi All, I am currently working on pilot FMEA program for one of the critical assets in our plant. There has been a debate on the RPN minimum number, where the failure mode is defined as "high risk" and "need immediate attention" at the number of 120. Any RPN above or equal to 120 is HIGH RISK...
  6. Orga78

    Acid gas dew point corrosion phenomenon in incinerators

    Hi all, We have recently done investigation of the cold-end corrosion case on 4 (four) of our incinerators. From the analysis, we have seen a correlation between the low skin temperature of the incinerator vs weather temperature --> where high low skin temp alert occurred especially during...
  7. Orga78

    Definition of DBFF, DBSE, Face Tolerance & Bore Tolerance

    Hi, I am new in the realm of alignment methodology, techniques and fundamentals. I am interested to know about these terminology: DBFF (Distance Between Flange Faces) DBSE (Distance Between Shaft Ends) Bore Tolerance Face Tolerance Appreciate if any of you experienced alignment hands could...
  8. Orga78

    Forced Draft Fan vibration increased as boiler load increased from 80T/hr but reduced at 115 T/hr

    Here are more info on the issue: 1. Noise can be heard at FD Fan inlet when the boiler load starts to be increased from 85 T/hr to 103 T/hr 2. During this time, overall vibration increased from 3.2 mm/s to 5.8 mm/s 3. Air intake into FD Fan is controlled via IGV Unit 4. Dominant peak at 1x...
  9. Orga78

    Acid gas dew point corrosion phenomenon in incinerators

    Thanks greenche We are in the midst of our investigation, gathering as much data as we could to find the cause of the cold-end phenomenon. This is a Tail Gas Incinerator Unit where it burns the tail gas (from CBA Reactor), with feed gas (methane) and air. Detection of the corrosion was only...
  10. Orga78

    Acid gas dew point corrosion phenomenon in incinerators

    The combustion temperature is set at 650 degC. While measured skin temp ranged from 118degC to 260 degC. Acid Gas Dew point as per spec is 126 degC. Fuel gas used is the Feed Gas (Methane). Another information shared by the Operations folk is that, they "generally" will see this cold-end...
  11. Orga78

    Forced Draft Fan vibration increased as boiler load increased from 80T/hr but reduced at 115 T/hr

    Hi, We are experiencing marginally high vibration at our FD Fan DE & NDE when the boiler load was increased from 80 T/hr to 105 T/hr. And the vibration reduced when the load is at 115 T/hr. See below table for the measurements: Fan DE Horiz Casing Vibration mm/sec 2 2 1.8 2 2.1 1.9 Fan DE...
  12. Orga78

    Acid gas dew point corrosion phenomenon in incinerators

    Hi MJCronin, Will post some drawings later (no pics unfortunately). " Occurs on both top and bottom section of the incinerator. Thanks for the good sets of questions as well, will take them up with the process guys for further discussion. Will revert back to you once I have more...
  13. Orga78

    Acid gas dew point corrosion phenomenon in incinerators

    Hi all, We have a recurring problem of corrosion in our waste gas incinerator units, suspected to be due to the acid gas dew point issue. The temperature at the bottom section of the incinerator shell showing below dew point of 126 degC (temperature reading 110 degC). Inspection was conducted...
  14. Orga78

    Rupture Disc / Burst Disc for Storage Tank

    Thank you all for the info & inputs. The burst disc ruptured when drying work was commencing with dry compressed air, set at 1 BarG, and the possibility of due point valves were still in closed position. There was a delay in our alarm signal system that it picked up the signal of the burst too...
  15. Orga78

    Vibration level increased after precision laser shaft alignment

    Photo of flex couplinghttp://files.engineering.com/getfile.aspx?folder=e13db7c1-2dae-4ac6-a0ce-8dabc197cf39&file=Flex_Coupling_UNI_DRIVE_100.jpg
  16. Orga78

    Vibration level increased after precision laser shaft alignment

    Here are the photos of the motor-pump assy, and the flex coupling for your reference. Perhaps, will give you clearer picture of the issue. http://files.engineering.com/getfile.aspx?folder=c4b82cf6-84bc-41cf-b64b-5fd7d8d4c4ab&file=Motor-Pump_Assy.jpg
  17. Orga78

    Vibration level increased after precision laser shaft alignment

    Hi All, Thank you for the inputs so far. Been travelling to other site lately. See following for the vibration reading of Motor NDE & DE, BEFORE and AFTER alignment was adjusted: Motor NDE unit: mm/s (RMS) Component Before [After] Axial 1.3 [5.25] Tangential 1.3 [0.40] Radial 0.7 [2.37]...
  18. Orga78

    Vibration level increased after precision laser shaft alignment

    Hi, We recently conducted vibration data collection on of our pump system (positive displacement pump), and the vibration reading at pump side was high, while motor side was within limit. Coupling is flex elastomeric tyre coupling. Alignment check was done by using laser precision method. The...
  19. Orga78

    Rupture Disc / Burst Disc for Storage Tank

    Thank you very much all, for the useful input. We recently had an occurrence of a ruptured burst disc, occurred due to the tank's drying with compressed air. The tank is located in the cold room, with N2 blanketing. Burst Disc rating at +0.6 Barg @ 6 degC. May I know what is the rated...
  20. Orga78

    Rupture Disc / Burst Disc for Storage Tank

    Hi, May I know, in normal operations, will the rupture disc/burst disc installed on the tank's vent line ALLOW the gas to flow through it, as long as the pressure in the line is lower or within its burst pressure, as a mean of +pressure breathing? In this case, during re-filling of raw...

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