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...
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...
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...
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...
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.
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...
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...
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...
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...
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...
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...
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
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.
