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  1. MachinaMan

    Coal Fired Power plant Pulverizer CD is consuming more power

    Our mills ampere-age changes with ball loading. I assume here that a tube mill is the same as a ball mill.
  2. MachinaMan

    Bearing Overheating

    Hi Cessh, Both vibration and overheating are caused by a defect. The vibration does not cause the overheating, the defect does. The symptom that is vibration will be observed earlier than the temperature increase in a ball / roller bearing. You would be able to detect the defect symptoms in...
  3. MachinaMan

    Exhaust Gas Casing deformation (rotor sagging)

    GT, What model of ABB/Alstom unit is it? We have some GT11N units that had Alstom issued bulletins about EGH cracking. Construction on the EGHs was flimsy in certain critical areas, leading to in service cracking. They have modified parts and a spring canister support for the EGH now to remedy...
  4. MachinaMan

    Lifting Lugs with ASME BTH-1-2008

    Hi Dik, That's correct. I select the closest available Crosby G-209 shackle for the load. The next available drill size will be used to make the hole slightly larger than the pin. AMSE BTH-1 accounts for the difference in diameter between the pin and the hole. Regards,
  5. MachinaMan

    Lifting Lugs with ASME BTH-1-2008

    Hi All, Thanks for your help. WillisV, Agreed, this makes sense to me despite being a mechie. NS4U, The 2008 version of ASME BTH-1 I am using is commented and most calculations refer to AISC. I beleive that the ASME code mostly describes certain cases covered by AISC. dhengr, I will post...
  6. MachinaMan

    Lifting Lugs with ASME BTH-1-2008

    Hi JAE, Thanks for the reply. I don't have AISC's table B4.1 however it seems like ASME BTH-1 table 3-1 has a similar entry. "Legs of single angle struts; legs of double angle struts with sparators; unstiffened elements, i.e., supported along one edge" Which has the following limits for...
  7. MachinaMan

    Lifting Lugs with ASME BTH-1-2008

    Hi Everyone, Baseed on thread507-273125, I am working on designing a standardized set of lifting lugs using ASME BTH-1-2008. For now, I am working on a single case and detailing the calculations. The lug is as per figure C3-3. I have also attached a sketch. I need to vary the angle of the...
  8. MachinaMan

    Working on a Book...Any Advice?

    Hi ESPcomposites, I would look into Lyx, it seems like it would do the job for you and it's free. Regards,
  9. MachinaMan

    How are ID Fans Loaded?

    Agreed, this can be confirmed by looking at your ID fan curve.
  10. MachinaMan

    French drawing's technical requirements

    Hi Z, Here is the literal translation (I'm a Canadian francophone): The position of the joint plan, injection points and ejectors will be subject to acceptance. material: Black ABS
  11. MachinaMan

    How to read a vibration analysis report

    Hi dharhay, google "commtest vibration primer" the first result is a downloads page. On that page there is a beginner's guide. It will help with most of your questions if I remember correctly. I'm sure other companies have these as well. Regards, MM
  12. MachinaMan

    NDE before and after PWHT

    Hi Humbug, We make that decision on a job by job basis. I work in a power plant where during an outage we have many contract welders. So we look at the welder's performance on past RT jobs and the job schedule to make the call. Like it was said above, when you have time to deal with...
  13. MachinaMan

    are there any websites that tackles design flaws of wind turbines?

    Hi Etrobal, Have you tried EPRI? They should have resources but may be expensive if your employer isn't a member. Regards, R
  14. MachinaMan

    ACME thread vs. UNC threads

    Hi drawoh, I agree. ACME threads are usually made as self-locking because they are a power screw. I still suggest checking for UNC because their use as a power screw is not what they were made for, therefore they won't necessarily be self-locking. Thanks for clearing that up for me.
  15. MachinaMan

    ACME thread vs. UNC threads

    Hi Steris, "Self-locking refers to a condition in which the screw cannot be turned by the application of an magnitude of force applied axially (not as torque) to the nut." Machine Design by Norton I can't confirm about the UNC being self locking or not, analysis is required to confirm or there...
  16. MachinaMan

    ACME thread vs. UNC threads

    Hi Steris, What wasn't discussed is that power screws like an ACME would most likely be self-locking while a UNC likely would not be. This may be a very important feature in your application.
  17. MachinaMan

    Online portfolios / resumes?

    Hi Davidinindy, I think that www.linkedin.com could help. It's like facebook but for professional puposes.
  18. MachinaMan

    Co-fire Sawdust in Boiler

    TCPhoenix, Alstom is a direct competitor to B&W for boiler work. They have always been good for us. They have the type of experts that I would go to for this type of project. Good Luck.
  19. MachinaMan

    REDUCING SAFETY VALVE SETTING PRESSURE?

    I totally agree with KenA. Usually the maintenance contractor for the safety valves will guarantee no chattering for up to 90% of the set pressure. If your operating pressure is above 90% of the set pressure, the contractor won't be able to help if you see chattering.
  20. MachinaMan

    Main Steam Piping Material

    Hi kb44, Be extremely carefull with your PWHT tempearture profile for 91 material. They must be dead on. Hi MJ, I think he/she means the radius of the elbow is 3x the diameter of the pipe.

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