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Steam Ejector

04/11/2014 12:39 PM

Ejectors are mostly used for effecting vacuum. Are ejectors used for pumping liquids? I have come across several get pumps, primarily to act as booster for centrifugal pumps which has suction level beyond 30 feet. But my question is can steam be used in an ejector set-up to pump water?

I could predict:

Available steam is wet. This wet steam is to be used as motive fluid and will soon condense on contact with water. So, may not act like 'air lift pump' where air will bubble and drift the surrounding water until the discharge end. In case of steam, there has to be brief time for the steam to get condensed in the discharge pipe, by which time; can we expect the steam should lift the available water? If the steam pressure is adequate, can we expect the discharge head be proportional to steam pressure?

I understand the pumped water would be hot depending upon the masses and temperature of water and steam throughput.

Also expect the nozzle bore would erode soon on handling wet steam.

Still, will it work?

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Guru

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#1

Re: Steam Ejector

04/11/2014 12:58 PM

Steam ejectors were formerly used as feedwater pumps - for some reason, they were called injectors. Google 'feedwater injector'.

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#3
In reply to #1

Re: Steam Ejector

04/11/2014 10:52 PM

I knew and forgot of those injectors totally. Thanks for reminding of this.

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#2

Re: Steam Ejector

04/11/2014 1:12 PM

We use them on COP (Clean Out of Place) tanks, to heat the water.

Very loud as the steam existing is breaking the sound barrier.

I not quite sure I under stand your question.......

but on powered condensate return pumps such as Spence 'Commander' uses steam to return the condensate back to the boiler.

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#4

Re: Steam Ejector

04/11/2014 11:19 PM

The device for pumping water is called a jet pump. This device works on a ventury basis which would be the same as a steam ejector. The jet pump jet is probably the easiest in which to see the principles involved. A compressed air jet woule be more effective than a steam ejector for moving water because the stem injected into water woulc condense and convert the heat energy of the steam into liquid.

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#8
In reply to #4

Re: Steam Ejector

04/15/2014 10:43 AM

The term "eductor" is generally applied for using a liquid as the motive power through a venturi to move another fluid source. A "jet pump" is more often a motor/engine driven pump used as a power source for a "jet" boat useful in shallow water since there is no external propeller.

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#5

Re: Steam Ejector

04/12/2014 8:24 PM

Disclaimer: I work for this company. We call these Steam jet Syphons, go to the following website for information: http://www.s-k.com/pages/pro_01_08.html

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#6
In reply to #5

Re: Steam Ejector

04/13/2014 9:48 AM

Good information, thanks...

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#7

Re: Steam Ejector

04/14/2014 5:31 AM

A1) Ejectors are widely used in the water industry in the UK as component parts of chemical dosing systems.

A2 & A3) Injectors are used in steam locomotive equipment to force make-up water into the boiler against the boiler pressure, which is stopping it going in on its own accord.

A4) In order for an injector to work, it has to overcome the boiler pressure.

A5) Yes.

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#9
In reply to #7

Re: Steam Ejector

07/28/2014 3:34 AM

This is a great device! I found some more information on this website: http://www.directindustry.com/industrial-manufacturer/ejector-66991.html

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