increase head of the axial flow pump

This seems to be a recurring thread...

You will (probably) only get improved perfermance at increased cost as you will have to work to tighter tolerances.

The clever thing is to improve performance whilst reducing cost...that requires inovation....

The 'easy stuff' has already been done, so maybe you need to think outside the norm, or find a cheap clever way of producing the better pump.

I often approach such problems by trying the opposite to the received wisdom...sometimes it works!

e.g A power transistor keeps getting hot and failing...instead of replacing it with a higher power device (the conventional, obvious answer) replace it with a smaller faster lower powered device, because it switches faster it has less time to get hot!

maybe a pump that works as both axial and centrifugal at the same time?

It's not my field of expertise....you need to become your own expert.

We han help, but are unlikely to want to innovate for you...after all, we'd be patenting it ourselves?

Good luck

Del

I suppose you are talking about the best pump in the existing range.

Increasing the speed should increase the volume and flow BUT you may be exceeding maximum safe norms set by the manufacturer.

An inline booster pump may increase the head (and volume). The setup must however be designed propperly.

I have some manual (Karassik)with a nice approach to this kind of pumps. It is very possible your company haves it. In case do not, please let me know. BTW, your question arouse other from my side: What is a Propeller and an Impeller? I think I have been using it wrong for years, since I always called Impeller to the spinning part inside the shell of a pump. Please be nice to me! English it is not my language neither the language of the countries where I have been working. (Closer to it was...Turkmenistan because the erection company was from India : P) Abel

Axial Flow pumps can go to 38 feet of head effectively and efficiently if your propeller hub is .7 x propeller dia. You are then out of current design wisdom and a 4 vane almost overlapping screw is what you want. Build one, test it and adjust from there. Or go with a mixed flow design. An axcial flow propeller uses no centrifugal force in production of head and flow. Mixed flow and centrifugal impellers do use centrifugal components. Typically high head 20 feet TDH and up are mixed/centrifugal, 20 feet TDH and less with high flow are axial flow. Axial flow propellers can be multiple stage (2 or mare propellers seperated by diffusers) to double or triple the head. In my expirience it is better to go with a mixed flow pump instead of multiple propellers for cost savings. Yopu will find better design info from A. J. Stepanoff

A pump usually has an IMpeller (or is it impellOr, MSWord seems to accept both), a propeller is usually fixed to a boat or an aEROplane. That's at least in colloquial English, though I've encoutered the use of 'propellor' being for the moving part of an axial pump/turbine. I've never seen it used for other types.

And the correct grammar is 'different FROM', not 'different to' and absolutely not 'different than'! It's 'similar TO'.

Glad I've got that off my chest, would anyone mind telling the BBC?

Ooooh don't start me on the BBC...

I nearly went mad when they (or was it ITV) insisted on sayin..

'Haitch Gee Wells' (HG Wells)

My surname begins with H (Aitch)...

'ere in 'arlow just bein' Norf of London, nobody pronounces their 'aitches' except when they say 'Haitch' aaaarggh.

My wife taught Junior special needs kids.....you wouldn't belive the trouble it caused!

Not to mention the 'th' 'F' thing...I mean fing.