Frozenbeernuts 1,652 Posted January 20, 2017 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? Share this post Link to post Share on other sites
frank 2,145 Posted January 20, 2017 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? 3 Share this post Link to post Share on other sites
the s is ilent 69 Posted January 20, 2017 Ask Mr Bernoulli about his theory Share this post Link to post Share on other sites
Frozenbeernuts 1,652 Posted January 20, 2017 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. Share this post Link to post Share on other sites
MTSkiBum 1,594 Posted January 20, 2017 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. Share this post Link to post Share on other sites
MTSkiBum 1,594 Posted January 20, 2017 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 Share this post Link to post Share on other sites
IGotWorms 3,315 Posted January 20, 2017 Try jiggling the handle 1 Share this post Link to post Share on other sites
Frozenbeernuts 1,652 Posted January 20, 2017 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. Share this post Link to post Share on other sites
MTSkiBum 1,594 Posted January 20, 2017 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. Share this post Link to post Share on other sites
titans&bucs&bearsohmy! 2,745 Posted January 20, 2017 Try jiggling the handle Share this post Link to post Share on other sites
mmmmm...beer 691 Posted January 20, 2017 Have you tried turning it off and on? Share this post Link to post Share on other sites
jerryskids 5,206 Posted January 20, 2017 As an electrical engineer I can tell you that that apparatus would likely draw roughly zero amps. YWIA. Share this post Link to post Share on other sites
SUXBNME 1,335 Posted January 20, 2017 Try jiggling the handle This If that doesn't work, use a bigger hammer Share this post Link to post Share on other sites
TD Ryan2 314 Posted January 20, 2017 Yes. What altitude are you at? You in Boston or Denver? Share this post Link to post Share on other sites
Frozenbeernuts 1,652 Posted January 20, 2017 Yes. What altitude are you at? You in Boston or Denver? The entire apparatus is in the same altitude so that is irrelevant. Share this post Link to post Share on other sites
Thornton Melon 544 Posted January 20, 2017 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.... Share this post Link to post Share on other sites
Thornton Melon 544 Posted January 20, 2017 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. Share this post Link to post Share on other sites
drobeski 3,061 Posted January 20, 2017 Place a concentric reducer in the outlet if the eccentric reducer to negate the static effects of the eccentric reducer Bam! Share this post Link to post Share on other sites
Frozenbeernuts 1,652 Posted January 20, 2017 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? Share this post Link to post Share on other sites
MTSkiBum 1,594 Posted January 20, 2017 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. Share this post Link to post Share on other sites
Thornton Melon 544 Posted January 20, 2017 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... Share this post Link to post Share on other sites
Frozenbeernuts 1,652 Posted January 20, 2017 Err, I think Drobs was joking there... Yeah he probably was. I don't think that would do anything. Share this post Link to post Share on other sites
Thornton Melon 544 Posted January 20, 2017 Yeah he probably was. I don't think that would do anything. It would make it worse for the pump, that's for sure Share this post Link to post Share on other sites