how steam injectors work

[@amanofmanyparts9120]

Excellent tutorial. I'll recommend it to all my pals in the miniature steam loco and traction engine community. You only missed two points: The injector body *must* be cold for it to work, as does the feed water. It will warm up enough through absorbing the heat of the steam driving it to not excessively cool the water in the boiler. I'm waiting for confirmation of a collection appointment for my 'new' 3" scale Traction engine which has a hand pump, a crank driven pump and a steam injector.

[@kylethedalek]

a man of many parts why does it have to be cold? And I don’t get how the water goes from the delivery cone in to the boiler? Is there a suction or something?

[@ddkoda]

A very ingenious and noteworthy invention. This was a little more complicated than I anticipated but certainly much more efficient for the boiler by injecting it with heated water.

[@chrisclement8200]

I was curious about how they added fresh water to steam locomotives and this seems perfect!. Thanks!

[@mogeroithe]

Would have been a great video if there was an actual human voice narrating. The robot voice kills it

[@sarcasmo57]

As a robot, I appreciate seeing my kind getting jobs on KZbin.

[@tatemantis9293]

sarcasmo57 As I human I am unappreciative of seeing humans lose jobs on KZbin.

[@jonka1]

@Oliver Matthews Well said and without petty predudice

[@dougduddles8464]

No kidding! I cannot STAND watching videos with crap text to speech generation. Sorely, you must know someone who can read and speak!

[@GoutamNarayan]

There is a slight modification of this application to generate vacuum in vessels. They are called Steam Ejectors, they are used as vacuum pumps in refineries to produce vacuum in vessels for process requirements, and yes they are also used as gas compressors to pump out gases from negative spaces in vessels to incinerators which operate at higher pressures. They are preferred over traditional rotary equipment because of their high reliability (since they don't have moving parts), and low operational costs.

[@dannywilliamson3340]

This is essentially the same mechanism as a steam jet air ejector in steam turbine power plants of all sizes....from tiny submarine power plants to thousand-megawatts commercial plants. The turbines must exhaust into a very high vacuum to mazimize the cycle efficiency. An air ejector is used to draw and maintain that vacuum in a huge condenser that can handle the total amount of steam flow, returning it to the boiler feed pumps as condensate. The air ejector exhaust is routed to its own small water cooled condenser to recover the condensate. Once a vacuum is established, there is practically no air to be exhausted.

[@Eugene2ndW]

What initiates flow as steam line is slightly lower pressure than the water in the drum?

[@BeingRomans829ed]

Excellent. Much, much better than the teaching video I watched just before this one.

[@crackedemerald4930]

For me, a surreal meme connoisseur, the most jarring thing about the robot voice is that it's delivering information a 3+1 dimensional like me can comprehend.

[@jimsvideos7201]

Ejector - or specifically eductor - pumps are common in aircraft fuel systems for using a smaller amount of flow from a mechanical pump to move a larger volume from one tank to another.

[@savnialave4665]

My self Marine engineer and being very curious about Steam locomotives . This clip cleared my doubts. However if I can get some information about below. Superheated steam is used for steam reciprocating engine after work completion why this steam is dumped as in Marine field it is going through the steam condenser and back to water reservoir we call it cascade tank. Is there any manual pump for water transfer to Boiler during cold start as steam injector need pressure

[@saarpaz4584]

Is there a decent steam flow speed to mount a turbine or it's just static pressure in this system?

[@ninalli]

That was excellent. I now understand how a steam injector works. Thankyou,

[@mekanizmalar]

Thank you for your visit and comment.

[@mekanizmalar]

Thank you for your visit and comment.

[@Randulfrofwoodsend]

Though testing some other steam operators and myself found the the injector process is highly temperature dependent. If the temperature of the injector is high enough the injector will cease to function and has to be cooled in order to inject water.

[@mekanizmalar]

Thank you for sharing this info for us.

[@boriakboriak5101]

Video má jednu chybu! Voda v nádrži musí byť postavená vyššie ako injektor,aby sa k nemu dopravovala samospádom...injektor nemá schopnosť vodu nasávať z miesta položeného nižšie pod jeho úrovňou...skúste si naštudovať Giffárdov parný injektor. S pozdravom

[@russ1618]

It was implied in the video, but not stated directly that the injector's pressure must be higher than that of the boiler for the check valve to open. While the injector builds pressure, it will circulate water in the atmospheric pressure holding tank. Thank you for your explanation.

[@mekanizmalar]

Thank you for your visit and comment.

[@Shipwright1918]

Well, it should be impossible to overcome 150psi of boiler pressure with 150lbs of boiler pressure, but the injector makes this possible. I was always told that the pressure head was converted to a velocity head as the steam mixed with the incoming feedwater and gave up its heat energy to the water, thus raising the pressure in the feed line over that of the boiler, kicking open the check valve and allowing the water to feed into the boiler. I know before the injector was invented, there were usually steam powered or axle-driven piston pumps used to put water in the boiler, the pumps' output pressure being higher than the boiler could ever go. The beauty of the injector is that it has virtually no moving parts, and does the same job.

[@kleetus92]

russ1618 maybe it's a terminology thing, but the injector wont circulate water... its typically dumped out on the ground, on locomotives anyway, that way the engineer can see if it 'picked up'... When the injector picks up it does it in a snap literally, and leaks practically nothing while running. Maybe a couple of drops. And it makes a characteristic shreik when it's running, otherwise it dumps a lot of water everywhere, and you shut it off and try again. They are somewhat temperature sensitive, over heat one and it wont work and you have to flow cool water through it to cool it.

[@WXUZT]

Remarkable…Thank You for uploading this information…

[@seyhanersoy8989]

Thank you for your nice comment.

[@dorothygale5896]

Pre heaters and feed water pumps work just fine, thank you.

[@BobSmith-in4js]

If you can do all that animation, why not buy a mic and put your voice-over on the video?

[@mekanizmalar]

That is a good question. But there might be many reason people may use robotic voices. Maybe they have speech-impairment, stuttering or strong accent. However, they have some knowledge and they want to share that knowledge with people. I am hoping that with time they will make these robotic voices as real as a human voice. I am looking for that day, but I guess it is more difficult than we think it is. By the way, I wish I had as good voice as Morgan Freeman. His voice is music to my ears.

[@BobSmith-in4js]

mekanizmalar understood. is there someone nearby that could read your text to make it a little more life-like?

[@mekanizmalar]

Yes, my daughter use to help, but now she is busy with her work.

[@friedyamms]

Voice carries bias. The robot has no gender, accent, age, or emotion. it conveys pure information.

[@kleetus92]

friedyamms except when it's a Male tonal voice like here. Personally I don't care one way or the other... why do you?

[@r.a.monigold9789]

Very good. Informative without being boring. Nice. I finally get how it works and WHY it was needed. Thanks for sharing...

[@mekanizmalar]

Thank you for visiting my channel and supportive comment.

[@mekanizmalar]

Thank you for visiting my channel and your supportive comment.

[@pauln1557]

A good explanation, I don't have a problem with the artificial voice.

[@nigelmitchell351]

So is this principle the Coanda effect.?

[@auldteuchter9012]

No it's the Beronulli effect. Impressive application isn't it.

[@welshpete12]

Very clear and helpful description, but I wish you had not used a computer voice .

[@RichardGMoss]

Interesting but couldn't listen to the end because of the robotic voice. There are much better ones on the market today if this path must be taken

[@philbox4566]

Yeah, I wanna hear Steve Irwin narrate this video. Crikey look at that steam flow, it's a big one. ;)

[@paraglide01]

I used to work in the food industrie were I operated a freezer dryer on the vacuumchamber principle which drew its vacuum via a steam driven ventury. Basicly the same principle only we pumped out air instead of water.

[@mekanizmalar]

Thank you for your visit and enlighten us with that information.

[@clevernduruza8624]

So its just a carburetor?

[@aftabsmerchant1]

Good, Complex Subject explained simly, Like Vrusb said, I am exploring this for HVAC ammonia pump application and shall be happy if you can guide me where I can get these, or I plan to develop one for myself, and look forward for all support I can get

[@GWRProductions-kg9pt]

4:37 well you've got that bit wrong as the overflow is dumped lineside rather than pumped back to the steam loco's water tank which will warm the water up rendering both injectors useless

[@jeffreynelson2660]

Does this take the place of the steam condenser? Or is that still required?

[@mekanizmalar]

Jeffrey, thank you for your visit and comment. As far as I know steam locomotive did not have a condenser. This was Achilles heel of steam locomotive. Not having a condenser required that they should replenish the exhaust water often. Also not having condenser reduced steam locomotive efficiency significantly. Steam injector required to push the replenished water to the boiler. If someone successfully adds a condenser to the steam locomotive, they would become viable again.

[@jeffreynelson2660]

you may be interested in the Doble E steam car, Jay Leno has one. I believe that it had a condenser and re-circulated the boiler water (but not sure). The King Rose archives movie from 1924 does not show any steam escaping.

[@pleindespoir]

I've been watching some vids about old trains and wondered how the cold water could get into the high pressure boiling chamber.

[@oldigger7060]

Me too!

[@haroldpearson6025]

Pumps were and still are used.

[@erikellis1975]

Great video - thank you for taking the time to put this together. It would be very nice if you could add the relative mass flows to this description. For example, how much steam is necessary to entrain how much water? Naturally this varies by application but a simple illustrative example would be quite informative. Again, many thanks Mekanizmaler!!

[@chandrasekharbitta8152]

Please explain how check valve works in this operation

[@auldteuchter9012]

It's just the back pressure once the flow valve has been closed. Sort of like a bath plug .

[@claybair4904]

to make an injector work .you must turn on the water valve when it is flowing steady you pull the steam valve slowly at first then you listen for the steam and then jerk it open. if it works water goes in if not it goes out on the ground.at 2:00 am i FOUND I couldn't see any water in the glass I tried three times to make it work the fourth did I was 19 years old and thinking I was going to be blown to bits

[@mekanizmalar]

Thank you for your comment and feedback. If you are doing this in age 19 and working up to 2AM, than you will be very good engineer, provided that your Math skills is as good as your machining skills.

[@claybair4904]

Colorado & New Mexico bought a part of D&RGW rail road in 1970 .I was the person who fired the engine the first night. It took most of that day to get a head of steam and we were going to take the train to Chama the next day

[@ЭраСтимпанка]

Действительно полезная информация, благодарю

[@myty2]

Can anyone suggest me company/distributor to buy this device? Thanks

[@venkatasaiprasannachigiche1704]

Very nice explanation. Thank You.

[@mekanizmalar]

Thank you.

[@6969smurfy]

Has anyone ever done a comparison of efficacy on injection vs pump?

[@seyhanersoy8989]

When you are using steam injectors in locomotives, we do not need an external power source. In order to use a pump, you should use something else instead of steam.

[@6969smurfy]

@@seyhanersoy8989 so what I'm getting at is how much energy is used in boiler to fire injector? I looking into a diffeant application, I don't care how I get water into it, I just want the most efficient way of doing so. One could use electric pump powered by a on board generator. I'm only interested in the most efficient way of achieving high pressure fill cycle.... Thanks

[@seyhanersoy8989]

@@6969smurfy Hi Dan, I made a google search about steam injector efficiency; Wikipedia says it has %98 efficiencies. If it is correct, this is excellent efficiency

[@6969smurfy]

@@seyhanersoy8989 hhmm to understand that correctly it would take 2% of the out put maybe? Somthing to think about. Sound like I would not have to worry about adding extra output on my boiler design. Thanks

[@jimviau327]

I love those informative video. Thanks for sharing!

[@mekanizmalar]

Thank you for visiting my channel and nice comment.

[@bogdanresume]

Jet pumps are used on aircraft to move fuel.

[@nagarajm.g7814]

Very informative. Easy to understand. Thanks a lot.

[@mekanizmalar]

Thank you for your nice comment and support.

[@LiLi-or2gm]

Imagine that you have a robot voice and that you need to convince the person you secretly love that you are not really a robot . . .

[@johnward8719]

excellent, clear explanation. Thank you.

[@mekanizmalar]

You are welcome! and thank you for your comment and visit to my channel.

[@Vrushabmn96]

there are steam jet refrigeration system which uses this principle

[@flyingblossom]

Well done!

[@wakilahmedansari3296]

Very nice demonstration thankyou sir

[@letrainavapeur]

As shown this injector will not work, the water remaining between the combining cone and the diverging cone will cause turbulence and stall the injector. While running the overflow must be dry.

[@albertvanheerden7604]

Great idea! Thanks for the video.

[@HimanshuShekhar1]

Thank you for a great video

[@gregwarner3753]

Well done explaination.

[@mekanizmalar]

Thank you for your nice comment and visiting my channel.

[@mikeab93]

Steam injectors can be used to heat up cold water without the use of water heaters. This is how we preheat our ice cold water up to 80 deb F.

[@민달퐁이-z4y]

I was really really curious!

[@anubhavkapoor2305]

steam ejector is used in vd in steel melting plants

[@raykent3211]

nice clear explanation, thanks! As for applications, I remember reading many years ago about a steam powered model aircraft. To keep the weight down it had a flash boiler holding only a very small amount of water. I assumed it had a piston-in-cylinder pump to feed in cold water, but more likely it did it this way.

[@mekanizmalar]

+Ray Kent Thank for the feedback. I newer heard a model airplane working with steam. I will do some search about this. It is very interesting.

[@arefabdallah7577]

twitter.com/382178d95b3522d56/status/719079525670395904?SqJp=6f2bfb6c-6b7f-45a0-90ae-cf093afda627 to get real free games how steam injectors work

[@stevecummins324]

been years since I've seen any activity on the site but www.flysteam.co.uk/recent.htm has some specifications etc.

[@stevecummins324]

Rather than a pump, many model steam vehicles use a pressurised fuel tank to push fuel to the burners. Similar principle could be implemented for boiler feed water. May also be of note that full size rockets have very thin wall fuel tanks... the thin walls keeps the mass down. When unpressurised such tanks have little rigidity, but once pressurised, they work exceedingly well as structural elements.

[@raykent3211]

Thanks for the info Steve, sounds like a pre-pressurised cold water tank would be simplest for short flight times... Interesting!

[@jkaugust3586]

Pretty good explanation

[@mekanizmalar]

Thank you for your comment and visit to my channel.

[@FilterYT]

That was great, thanks!

[@mekanizmalar]

Thank you for your visit and comment.

[@jimw83296]

i can think of 1 use right now.......controlled mixing of reactive chemicals.

[@joebender3662]

That seems almost like it breaks some law of physics.

[@ag2816]

Very good.Thank You

[@johnlaccohee-joslin4477]

The subject matter is interesting but once again the computer has won the day by removing the human touch to the descriptions. Why could this not be done with someone actually talking rather than some badly puctuatated chip doing the lecture. There are so many videos out now where this practice is the norm, or at least in the mind of the producer. PLEASE PLEASE , LETS HEAR PEOPLE DOING THE TALKING IGF NOTHING ELSE, IT THE THING THEY DO BEST.

[@ckshim4964]

보일러 증기압을 줄여 물을 주입하는듯 인젝터에 물이 없어도 증기의 일부는 순환할듯

[@saradhipapisetti1265]

Well explained tanq

[@billtomson7514]

I still don’t understand why the pressure coming out of the injector is higher than that coming in

[@Harrlond]

Two things need to be understood to fully understand this injector. 1) fluids travelling through a divergent cone at super-sonic speeds gain velocity while loosing pressure. 2) fluids travelling through a divergent cone at sub-sonic speeds lose velocity and gain pressure. so the first convergent nozzle creates super-sonic steam and the divergent cone here only increases the velocity of the steam. ( refer to 1) ) After the water and steam mix within the second nozzle, the steam loses velocity and the water gains heat from the steam. This flow of hot water is now sub-sonic. This subsonic flow through the last divergent nozzle now acts to decrease the velocity but increase the pressure (refer to 2) )

[@billtomson7514]

Thank you I can see how the velocity reduces as the fluid flows through the divergent cone at all velocities but I must admit I cannot understand how it increases at supersonic speeds but decreases at subsonic speeds.I can see how if steam flows through a convergent cone it will increase in velocity so the total volume per unit of time that passes by a point will be constant since the diameter is smaller. Likewise going through a divergent cone since the diameter is larger the velocity will decrease so as to keep the volume per unit of time constant.How the diameter and the velocity increases without creating a vacuum behind it to suck the steam through even faster I must admit eludes me.

[@Harrlond]

there's a whole science behind fluid behaviours in nozzles. look up videos on de laval nozzles and rocket nozzles, theres loads of information about it. admittedly most of it goes over my head too but apparently it works! also you might want to look up water hammer pumps. I believe that these injectors work base on some of those principles too about just slamming an incompressible liquid through a one way valve.

[@crookedriver2079]

Harrison..First class explanation !!! Succinct but TO THE POINT! In fact elegant !

[@hermitoldguy6312]

Harrison Long said "1) fluids travelling through a divergent..." *Convergent? As it is, it reads as if fluids behave differently above and below the speed of sound. I'd remove the clause "at super-sonic speeds" from both 1) and 2). You can edit your post.

[@penderkev]

Firefighting foam is sucked from a jug using a water charged fire hose and an eductor then an applicator hose

[@68Jaguar420G]

Good overall explanation but why not have a human narrate the video?

[@jonka1]

As an antidote to the moans about the computer voice, how would an English speaker communicate with, say, a Hindi speaker? You could try shouting slowly in English or use a voice synthesizer to bridge the language barrier.

[@mekanizmalar]

First time someone addressed this issue clearly. Thanks. Now robotic voices are more advanced tanks to people doing research in this field.

[@kenrose1154]

Simple version of a inter and after condenser

[@TonyW590]

Great video, such a shame about the dreadful voice.

[@narsinhdaspanchal5509]

Good intonation

[@kmh2o691]

это правда?

[@mekanizmalar]

Да!

[@kmh2o691]

KZbin Hindi по русски плиз моя твоя не понимать

[@mekanizmalar]

это был спам, я удалил его.

[@manubs7597]

nice....simple....

[@mekanizmalar]

Thank you.

[@ReevansElectro]

This would be very useful in my electric car. Why didn't Elon use this?

[@crackedemerald4930]

Why would it be useful?

[@ranailyas2560]

great

[@errolhusaberg3791]

God another robot voice video. Thanks anyway...

[@crp5591]

OMG! KZbinrs.. Please just use your own voices!!! It would have been an awesome and informative video except for the computer voice!

[@ben3989]

For those unfamiliar with what a steam injector is, a brief description would be good. Otherwise, this appears to be a pointless recirculating machine.

[@mekanizmalar]

Thanks for the feedback. If you add additional info you wish to have just reply this message with info and I make sure that every one sees it.

[@paintmax1052]

As steam is used water has to be added back in. The injector does this. Without cold water and condensation the velocity doesn’t change, the pressure just equals and goes out the overflow

[@manfredadams3252]

Thumbs down. 1980 robot voice is only one step removed from no audio with text popups.

[@mekanizmalar]

Dear Manfred, thank you your visit to my channel and your good intention to make this channel more user friendly. .I accept my part of the problem. However if you notice at the top right corner of the video there is a circular icon which is a link to newer version of the video. I guess you missed it. I also just put a link to annotation section of this video. Both link will take you same video with human voice,

[@praddyumnadurge9341]

❤️

[@seyhanersoy8989]

Thank you.

[@joerobinson4453]

Thermocompresor

[@jj8171]

voice ruined the presentation. i fell asleep