Question for Drobs, or any engineer I guess

[Frozenbeernuts 1,652]

I guess this could be for any engineer on the site also.

 

I slacked in hydronics and now I cannot answer a simple question. I was hoping you could

 

Say I have a column of water and at the base of the column I have an eccentric reducer, presumably the larger diameter facing upward. Would the reducer (eccentric mind you) affect the static head pressure at all?

[frank 2,143]

 

Say I have a column of water and at the base of the column I have an eccentric reducer, presumably the larger diameter facing upward. Would the reducer (eccentric mind you) affect the static head pressure at all?

I have a column of water and at the base of the column I have an eccentric reducer, presumably the larger diameter facing upward. Would the reducer (eccentric mind you) affect the static head pressure at all?

[the s is ilent 69]

Ask Mr Bernoulli about his theory

[Frozenbeernuts 1,652]

I don't believe it does, but I am not 100% certain. Did a little googling to find mostly friction type answers to multi dimensional piping systems. Plus a lot of pump calculations.

[MTSkiBum 1,593]

no.

 

I do not completely understand the questions. I know hydro-static pressure calculations quite well, but i have no idea what an eccentric reducer is.

[MTSkiBum 1,593]

I have a column of water and at the base of the column I have an eccentric reducer, presumably the larger diameter facing upward. Would the reducer (eccentric mind you) affect the static head pressure at all?

 

I laughed

[IGotWorms 3,297]

Try jiggling the handle

[Frozenbeernuts 1,652]

no.

 

I do not completely understand the questions. I know hydro-static pressure calculations quite well, but i have no idea what an eccentric reducer is.

Do you know what a concentric reducer is? Concentric has the reduction in the center making both the center of the larger diameter side and smaller diameter side the same. An eccentric has the smaller diameter's center offset. This is used usually so that liquid cannot be trapped in the bottom where a reduction is made. The suction side of the pump uses an eccentric reducer so that gradual buildup of air doesn't occur like it would in a concentric.

[MTSkiBum 1,593]

Do you know what a concentric reducer is? Concentric has the reduction in the center making both the center of the larger diameter side and smaller diameter side the same. An eccentric has the smaller diameter's center offset. This is used usually so that liquid cannot be trapped in the bottom where a reduction is made. The suction side of the pump uses an eccentric reducer so that gradual buildup of air doesn't occur like it would in a concentric.

I know nothing about that, but I do manage a software that calculates head pressure in wells.

 

There is nothing inside the well that affects the head pressure, only the length of column of liquid above where you want to take the measurement.

[titans&bucs&bearsohmy! 2,745]

Try jiggling the handle

[mmmmm...beer 691]

Have you tried turning it off and on?

[jerryskids 5,154]

As an electrical engineer I can tell you that that apparatus would likely draw roughly zero amps. YWIA.

[SUXBNME 1,318]

Try jiggling the handle

This

 

If that doesn't work, use a bigger hammer

[TD Ryan2 314]

Yes.

What altitude are you at? You in Boston or Denver?

[Frozenbeernuts 1,652]

Yes.

What altitude are you at? You in Boston or Denver?

The entire apparatus is in the same altitude so that is irrelevant.

[Thornton Melon 542]

The height of the water in the column is the only thing affects the head pressure. So, the answer to your question is No.

 

Unless, of course, the reducer is REALLY eccentric, you know, like Emo Philips or Pee Wee Herman or something....

[Thornton Melon 542]

Actually, I didn't see that you have a pump there. I thought you were just talking about static head. You're looking to see if the eccentric reducer affects NPSHA, right? It probably does a little. If you can't find the answer, it probably never concerned anyone enough to publish any data. I'm sure it's probably negligible enough to ignore. Just throw in a little extra safety factor, you should be fine. I think.

[drobeski 3,061]

Place a concentric reducer in the outlet if the eccentric reducer to negate the static effects of the eccentric reducer

 

Bam!

[Frozenbeernuts 1,652]

Place a concentric reducer in the outlet if the eccentric reducer to negate the static effects of the eccentric reducer

 

Bam!

I cannot do that in this design. I don't have much room to work with. Does a reducer affect static head pressure at all?

[MTSkiBum 1,593]

I cannot do that in this design. I don't have much room to work with. Does a reducer affect static head pressure at all?

No.

[Thornton Melon 542]

I cannot do that in this design. I don't have much room to work with. Does a reducer affect static head pressure at all?

Err, I think Drobs was joking there...

[Frozenbeernuts 1,652]

Err, I think Drobs was joking there...

Yeah he probably was. I don't think that would do anything.

[Thornton Melon 542]

Yeah he probably was. I don't think that would do anything.

It would make it worse for the pump, that's for sure