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  1. Aub_Engineer

    Drilled check valves for warm up

    A word of caution is for top suction/top discharge or multistage pumps this warmup configuration may not be sufficient. You may need to route your warmup lines through the pump drains to properly heat the whole case and fluid inside. There is an example in API RP 686 to follow.
  2. Aub_Engineer

    California P.E. Reference Questions.

    I worked in an industry whose engineering was under the industrial exemption in CA. It was difficult to find coworkers with their PE when I went to apply. I submitted references from 2 coworkers who were professional engineers and 2 coworkers who were degreed engineers with years of experience...
  3. Aub_Engineer

    Experience with Segmented MultiStage Pumps

    8 stage SERO pumps are installed in ammonia service and have historically been unreliable. The mechanical seal life is very low, ~ 1 year MTBF. I'm curious if others have had experience with these types of pumps. The allowable nozzle loads are so small compared to API 610 pumps that I'm used to...
  4. Aub_Engineer

    Oil coming out of breather

    Do you have an oil mist connected to the bearing housing? I've seen purge mist attached to bearing housings and the oil would collect near the breathers.
  5. Aub_Engineer

    Test Pressure Selection

    I will agree with the statement that there is no "OR" in specifying hydrostatic pressure. Per ASME B31.3 the piping shall be subjected to a hydrostatic test at no less than 1.5X the design pressure. Your piping code will dictate what the minimum hydrostatic test pressure shall be. However, in...
  6. Aub_Engineer

    hydrotest

    I've never heard requirements for hydro/non-hydro tested bolts. PCC-1 appendix N gives information on reusing vs. replacing bolts. In my experience pressure vessels, columns, strainers, etc. built to pressure vessel code are opened, inspected, filters replaced, etc. regularly. The flange...
  7. Aub_Engineer

    Mech.Seal

    1) throttle bushing, I’ve also heard “disaster bushing” decreases a leak but doesn’t prevent one. 2) Standard clearance for fixed bushing is .015” and less for floating bushing .003-.004” 3) extra porting is available for quench or emissions recovery
  8. Aub_Engineer

    Orifice position in plan 22

    Most diagrams show the orifice between the discharge and seal flush cooler. I would consider moving it to position #2 if the pumped fluid is near its vapor pressure. This may help prevent flashing across the orifice. With that said, most literature will discourage the use of plans 21/22 in...
  9. Aub_Engineer

    Hot Tapping Near Pump Suction

    I have designed and implemented hot tap connections a few feet from the suction of a pump. Is there a spare pump that can run while the hot-tap is performed? Our main concern was if the "coupon" that is cut out is unable to be retrieved. Some other items you should verify: - Will the flow...
  10. Aub_Engineer

    Reusing Pump Baseplates

    An existing OH centrifugal pump (approx 150 HP) is being relocated to a new location in the plant. Has anyone successfully reused an existing baseplate (chipping out the existing grout and repouring in a new spot)? My gut tells me it will not save any money vs. purchasing a new baseplate from...
  11. Aub_Engineer

    Turbine Outlet Design Pressure - Centrifugal Pumps

    The outlet rating of the turbine is the pressure rating after the steam pressure has dropped across the turbine blades. It is important if you are placing the turbine between a high pressure system and a low pressure system. You don't want the low pressure system have a higher operating pressure...

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