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  1. petern1

    use of expansion joints

    I have to agree with MJCronin that expansion joints are often used where they are not required. They require a sigificant amount of maintenance and are expensive. I many cases, not used properly they are worse than not having them. In my refinery days we used them in fluid solids (i.e. coker)...
  2. petern1

    Large pumping system

    We have large pumping systems for tailings slurry with 5 pumps in series each with a 2500HP motor pumping approximately 25,000 usgpm. The motors for all five pumps are fed from the same VFD, and as ChasBean1 says we start at reduced frequency and ramp up the speed. The discharge is usually...
  3. petern1

    Booster Pumping System, Control Strategy

    I think one could write a text book on this. I need to get the terminology right as to how you refer to booster pumps. In our plant, we have slurry pumps (5 in series) pumping into a tailings line, then a set of two booster pumps mid-way along the line. Is this similar to your set-up? We...
  4. petern1

    Convert maunal ball valve to Automatic Shutdown Valve

    We commonly buy ball valves with double-actuating air actuators and solenoids. These are susally for valve in the plant that are not accessible and we locate a hand-operated station close to grade or a platform. We usually order them together, and the valve supplier ships thenm to an...
  5. petern1

    problem 16" knife gate valves

    We use knife gates extensively in slurry services, and have had a number of issues getting them to close. In some cases, the valves had origianlly been specified for pressure from one side only. This resulted in a valve ordered and installed with one way sealing, very little support for...
  6. petern1

    Dredging Hose and Pipe

    I have a general type question for you dredgers out there. The plant I work at has about 75 km of tailings and hydrotransport pipelines 24"/26"/28" diameter. We convey oilsand slurry or the same slurry withthe oil removed (tailings). The material has a d50 of about 150 to 200...
  7. petern1

    Rubber Hose

    We use rubber hose in oil services that contain bitumen and naphtha. The spec we normally go for is a nitrile that is resistant to the naphtha. The temperatures are relatively low - less than 200 degrees F. We use hose for wear resistance in addition to flexibility. Inspecting hose for wear...
  8. petern1

    New branch in a Steam Header

    I am unsure as why water would be a problem - unless there is a leak in the line or nearby line or you are working in a pipe chase/vault or underground. Anyway, dry magnetic particle in-process examination is a method we would use to verify the integrity of the root pass/hot pass of the...

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