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  1. someguy79

    shaft sleeve with cartridge mechanical seal

    I'm going through the guide specifications (reference specs not tied to a particular project) and finding some curious things. One is that we are requiring a shaft sleeve to be used on centrifugal pumps that also have cartridge mechanical seals. My impression was that since a cartridge...
  2. someguy79

    enclosed pipe volumes at various pressures

    I'm not concerned with temperature change here. Correlations between temperature change and volume are easy enough to find, as are the relevant data for coefficients of thermal expansion. I expect the change in volume to be very small. If I could find the relationships myself, I suspect I could...
  3. someguy79

    enclosed pipe volumes at various pressures

    zdas04, Where did you find a volume-pressure relationship on 2" Sch 160 pipe? that's exactly the type of information I'm looking for.
  4. someguy79

    enclosed pipe volumes at various pressures

    I'm looking for a relationship between pressure and change in the enclosed volume of a pipe. I have the equations to generate radial, tangential, and longitudinal stresses. I had planned to use these values to get strains and convert that into a change in volume. I am concerned that the radial...
  5. someguy79

    Impulse Pressure Waveform

    Panther140 has the right idea. I also think this will need an electronic drive system of some sort. Perhaps an "electrodynamic exciter" that acts on a low density incompressible fluid could do the trick. Be careful though, lots of those low density, low viscosity liquids are also quite...
  6. someguy79

    Specific Gravity impact on the system Curve

    [original post deleted] I've removed my original post. I'll put more thought into it next time. Sorry for presenting incorrect info.
  7. someguy79

    Curves Worthington Pump D-820 at 5,5 Hp

    Take the pump info including make, model, serial number, impeller cut (dia.), rated head, and rated flow Flowserve. The picture of the nameplate you posted might even suffice. Ask them for a curve. It's worth a shot even if they no longer produce that pump.
  8. someguy79

    Is there a difference between Air Relief Valve and Air Release Valve?

    In my experience, The is an important difference. An air release valve will be one set up to separate gas from liquid, typically using a float system. These do not necessarily open at any set pressure or pressure differential, only by the buoyancy of the float. An air relief valve will...
  9. someguy79

    Radial Piston Pump

    simran1983, You mention that the noise occurs "while running idle", and that the noise goes away when you increase pressure to 70 bar. I assume that the suction piping comes from a tank/reservoir at atmospheric pressure, and that the 70 bar measurement is the discharge pressure. What do you...
  10. someguy79

    Junior Rotating Equipment Engineer

    I'm in the US and agree with jpankask for most of his points. Whether or not the added difficulties of working abroad are worthwhile, that's really subjective. I have done a bit of work in Saudi Arabia. It's quite different than working in the US. Work cultutre, expectations, pay, and lot of...
  11. someguy79

    Booster pumping in series questions

    There are other reasons to pump in series. One example I deal with is wastewater pumping. The stuff that's in the wastewater requires use of impellers with large openings. Most of the appropriate impellers will not make a lot of head. So when there's a sewage pump station that needs high head...
  12. someguy79

    Looking for a flexible material to transfer heat but not electricity

    Does this pool have users with any particular kind of shock hazard? I'll assume you do, and that it's similar to a swimming pool. You mention that the heaters use GFCI, so I expect that the heaters are well grounded. Have you considered using a grounding system in the pool, or between the pool...
  13. someguy79

    reverse engineering volume

    In a typical system, I would just find the expected ID, compute cross sectional area, and multiply that area by the pipe length. Rarely is anything more sophisticated required or accurate. Notable exceptions to pipe volume are when the pipe run consists of short runs of straight pipe with a lot...
  14. someguy79

    open channel flow meter

    Here's a reference I've found useful. It's not as nice as an engineered solution from some of the flume suppliers; but could work to get started. http://www.engineeringtoolbox.com/weirs-flow-rate-d_592.html
  15. someguy79

    Pumping control system - Auto start - Discharge pressure Trip

    Recommended time between restarts could have nothing to do with the pump and hydraulics also. Often, the frequency of starts will be determined by motor characteristics such as instulation and allowable temperature rise.
  16. someguy79

    Well woes

    Is this a system you already have running, or are you in the process of building it? I assume that you're installing the pump at 60' down (instead of at water level) so that you can pump down the well, then allow it to refill. Iassume that the 1.5 hp is the motor's nameplate horsepower. I also...
  17. someguy79

    witness pump test - items to watch for

    I'm planning for a witnessed pump test at the factory. I haven't done a witnessed test before, so I would like to get some opinions on what to watch out for during this process. I don't expect the manufactuer or mfr's representative to do anything unscrupulous, but it's always possible, and so...
  18. someguy79

    200,000 psi hydraulic pressure vessel wall thickness?

    200 ksi working pressure is immense. I guess that's why you're posting here. I don't have much for answers, but here are few questions that might steer you toward some helpful tools/info. What is this thing going to be used for? Will this thing be load cycled many times? Are there any...
  19. someguy79

    6100 lbf load on 3 ton hoist

    If you want to talk odd units and vehicles, go about measuring emissions as grams/horsepower/hour. That's actually a pretty common unit here. At least it's common among those who keep track of emissions from vehicle engines. It mixes time bases (seconds used as a fundamental unit in hp vs...
  20. someguy79

    6100 lbf load on 3 ton hoist

    LittleInch, Thanks for the laying out the arcane historical reasons for the differences. I've long suspected that it has to do with changes in the unit of measure associated with one ruler or other. It actually is interesting. Oddly, I've never seen the 231 cu-in /gal conversion before. It's...

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