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Recent content by dugal

  1. dugal

    Repairing holes in valves

    A complete valve change out might be considered if the valves functions are in question.
  2. dugal

    Design entry in a rotary vessel

    What is the steam inlet pressure and vessel pressure ?
  3. dugal

    Minimun cable bend radii

    A lot of hoisting and rigging handbooks will tell you the strength reductions of various cables on different radius pins or sheaves. Cheers
  4. dugal

    Class 150 Manway Lock?

    Another avenue to look at is the problem in some remote petroleum pipelines where theft of oil and piping xmas trees ocurr. A lot of the petroleum companies have put locking devices on their flanges to prevent opening or loosening. Cheers
  5. dugal

    High Pressure Non-Oring Closures

    Ever thought about just making it a welded joint if leaks are a worry ? A welded joint costs more money to open and close, but if it is not a frequent event .... Cheers
  6. dugal

    Class 150 Manway Lock?

    Sounds like someone in the past opened an access flange without proper approvals from the controlling authority. They might have had a close call of some sort from this event and as part of an investigation a locked flange was proposed as one of the corrective actions. I am only speculating...
  7. dugal

    Minimum Manway Size

    First off, we should refer in future to these as "access flanges" and not "manways". Manways is a thing of the past and not politically correct these days. I have supervised many trades staff of both genders. Believe me, both genders come in all different sizes and shapes. Some are just not...
  8. dugal

    Class 150 Manway Lock?

    Not sure there is enough info in your description of what you need.... Is the lock out needed to prevent/warn people from opening the flange or perhaps closing it after it has been opened for a reason ?? Also to be "politically correct" these days we refer to these flanges as "access flanges"...
  9. dugal

    Bolt Torque Charts- needed

    I think that general torque charts or databases should be made available to maintenance staff. However, my personal preference is to build up a more detailed database on each bolted joint in the facility. It may seem like a large task, but the end result is worth while. Each joint should be...
  10. dugal

    Insulating Flange Gaskets Assembly

    I have been involved for many years doing up small insulated flanges on large generators. Nothing in the size range you are talking about. A lot of large buried natural gas lines have insulating flanges just before the pipes go underground. They maybe a good source for your info. In insulated...
  11. dugal

    Weldless Eyenuts & Lifting Eyenuts Standards

    Hi Folks, Have a small problem at work. The mechanics use weldless eyenuts normally used for pipe hangers as rigging eyenuts as well. I told them that they are more than likely made to different standards and their uses should not be mixed up. They only stock weldless eyenuts in their...
  12. dugal

    Rust in Oil Pipes

    Hello, We have a problem with a lot of rust scale that formed inside long runs of 2"NPS steel pipe that usually contains turbine oil. When the unit is shutdown the lines are empty and open to atmosphere. The oil had in the past high water content due to poor operation of the oil...
  13. dugal

    Deaerator Bursting Disc Noise Problems

    Thanks Folks, Some good ideas tossed around here. I think it would take a team of one of our mechanical piping design engineers, turbine system engineer, a rupture disc and steam silencer company to resolve the problem. I am not at all convinced our configuration is proper. These...
  14. dugal

    Deaerator Bursting Disc Noise Problems

    Hi Folks, I looked more into our rupture disc (20")failure problems. It seems they are prone to fail (at 400kpa) on turbine start up and shut down. There are lot of pressure transients at these times. It has been noted that the CV's & MV's controlling the deaerator failed to do so on...
  15. dugal

    Deaerator Bursting Disc Noise Problems

    I will talk to the operators tomorrow and ask what is the most common reason for blowing a rupture disc. It does not happen often and could be an in-experienced field operator. I know maintenance do not change the discs out on any routine basis. dugal
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