Centrifugal Pumps and Mechanical Seals - Maintenance and Theory
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- เผยแพร่เมื่อ 27 ก.ย. 2024
- The Shrimp to Shark is back sharing a small video about Centrifugal pumps and mechanical seals!
Centrifugal pumps are critical in so many systems in the engine room! Therefore all engine cadets and engineers will work on them!
Its good to have theory and curiosity on how they work therefore lets work together to change the mechanical seal on a leaking pump, and learn some things while doing it.
Success and nothing else my friends I hope to share more of my life at sea little by little (Im working on a cruise ship now!)
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instagram - @Rafaelatsea
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Success and nothing else
Fantastic instruction and demonstration. You pace these videos very deliberately, which is rare and valuable to the viewer. Brings back great memories of the most rewarding career I ever had. Thanks Rafael!
My brother Mark! Thank you for such a kind comment of course lots of care is put in each video. I'm glad to bring back wonderful moments at sea! Rock on brother
Best explanation of mechanical seals I've seen
That makes me happy to read..thank you
Very good video, informative and helpful, cheers from a Norwegian Marine Engineer 😊
Thank you for the support Joakim, awesome to see seafarers all the way from Norway haha! Kind comments like yours are amazing! Success and nothing else my friend.
Hello Kristiansen, I will be relocating to Norway in a few months time and I am a seafarer. Would you like us to share WhatsApp contacts? Thank you
im surprise that your engineer let you overhaul a centrifugal pump as a cadete they really have trust in you, hope that every senior engineers have the same as your engineers thanks for the very informative video
Its not easy but with determination we can learn in all situations..of course support is always good, I was very lucky as a cadet.
Very helpful video
I just want to thank you for all your videos , they are extremely helpful and informative , please never stop you have helped me a lot
You are very welcome and I am very happy to see that you liked them!
EXCELLENT JOB
EXCELLENT VIDEO
GOD BLESS YOU, SIR
God bless amigo, thank you.
Excelente explicación paisano!! Cada día representando a nuestro país con talento!!
Agradecido amigo, siempre exito colega
You have a perfect knowledge for your rank and have extraordinary teaching skills keep up the good job and thanks for the contrubition to all the seafarers
I appreciate that! success and nothing else deniz, thank you
El compa de OpenEnglish despues de finalmente tomar el curso de ingles.
Saludos, bastante útil para saciar mi curiosidad, gracias por este excelente recurso.
Hahaha el inglés abre muchas puertas y caminos.. Esta me llevo al mar.
Feliz de despertar curiosidad
Awesome video. very informative to all aspiring marine engineer. Thank you and god bless.
God bless my brother thank you very much!
The centrifugal pump is an ingenious piece of technology that many people do not think about, it is different from a positive displacement pump. by turning the impeller, the product becomes weightless in the center point, the air pressure ensures that the product "in this case water" is pumped. The problem with a centrifugal pump is that it can only pump up about 8 meters. If you put the pump on a mountain, it will become even less because the air pressure there is lower than in a valley. This is what they taught me about it , impressive.
Aye my friend, the marvels of engineering and how stuff works is a deep hole that once you go in it's difficult to come out 😂. They are also multistage centrifugal pumps which can raise pressures to very high levels which can overcome many meters of height.
In cruise ships for example we have 18 bar pumps that can go up to 16 decks of height (which is about 45meters).
@@ShrimptoShark 45m impressive. I myself work in the paper industry if you like technology this factory is a playground. Here no multi-stage centrifugal pumps are used, but ordinary centrifugal pumps are used and many types of positive displacement pumps, especially worm pumps.
Many videos are represented clearly and interested. It support to me understanding more knowledges.
Now, I am engine cadet and thank you to make video.
I hope you are always learning and growing my friend.
Great video! Thanks for taking the time to make it!
It's my pleasure and happiness to see that the video is useful.
😭😭it must be a wonderful feeling even if the pump is small but the whole work is done by cadet , i never got a chance to do that, always was made to do some other work or never got my request accepted for complete overhaul. hopefully on my 2nd ship now
That's the truth brother, success and nothing else and have a safe contract. Bless your hands on all your jobs.
Your explaining and working are very useful
Thank you amigo, i appreciate it.
Very well explained thank you
Thank you
Hello from China ,ur talk is quite stabilized and slow motio~ed ,it's quite a unique style
Hahah thank you Chris! Ive heard of that before
long awaited new video sir. thank you 🙂
No problem success and nothing else! 🤗
Exellent explanation, keep up the good work Sir. Good Job
Thank you, I will try my best to continue even in my new environment cruise ships.
Thank you for sharing this knowledge.
Knowledge should always be shared success and nothing else!
Very nice explanation of topic
I'm glad it was of use amigo
This is beautifully presented. I need to up my presentations this far
Success my friend, I hope you are always able to share your stories.
The hardest part for me is working with people who have done this hundreds of time before. Since I don't want to slow the job down, I have to try to capture as much as I can with the little time I am able to ovserve individual steps. This is and will continue to be a painful journey but I hope it eventually becomes easier.
It gets easier each time but there are so many types of mechanical seals for different pumps. We get to see most of then onboard in various sizes. Success and nothing else
Excelente colega me encanta la forma que explicas estoy en mis exámenes de titulación y algunas cosas que hice en mi año de práctica las olvidé y tú me ayudaste a desempolvarme !
Exito colega, el aprendizaje y refrescamiento es importante, me alegra que esto sirva para afilar el conocimiento previo.
thank you Sir
Most welcome buddy
Very Good Information bro...very informative and good demonstration..
Next week i will be Traning Engineer on board....hope can be like you
With curiosity and hard work you will make it don't worry it's a good job.
thanks man
I appreciate that bro, success and nothing else
Thankyou for your information Sir
Thank you for your support
Thankyou!!! Great video
Thank you for the kind comment
Thankyou so much more videos ❤❤❤
For sure, every time I can share something I will 🤗
Very informative. Expecting more videos
Sure step by step, thanks for the support!
Very helpful sir
Heya bro! Im glad it could be of use, thank you for the support.
Realmente te quedó muy bueno el vídeo!, 👍
Agradecido jose, exitos siempre amigo.
Excelente
Agradecido por su apoyo
Very good video
Thank you
Thank you sir !!!
Success my friend!
More power :) solid video waiting for another video :) #shrimpmates #sharkmates
Jocooooooooo, success buddy, thank you for helping me in a wonderful contract on the Carnival Dream, I hope you are well.
good
How do we ensure that gap between both the stationary and rotating part of mechanical seal.? Please tell
When you assemble leave the clamping bolts fairly loose.. As the pump is running, there might be a small leak, gradually tighten until it's sealed.
I am studying for engineer of watch exam.
Your videos do help me.
Ready for your next videos bro
That's the idea my friend. Success and nothing else in becoming a great engineer 💡👍🏾
Is there any way to take wearing clearance without dismantling the pump? Usually we take it after dismantling, right. Like id of casing ring - od of mouth ring by 2.
If you are talking about the wear rings, I'm not sure if there is a way to check clearance without removing the volute casing.. You need the shaft OD and the ID of wear ring to see clearance.. If it is over tolerance shown in the manual then you need to put a new wear ring, if with a new ring it still won't allow then you need to replace the shaft.
@@ShrimptoShark i found a video of taking clearance using feeler gauge,in this case he's not opening the casing. But this is not of onboard pump. Is this method possible with our all onboard pumps also? Please find the link of the mentioned video(language is something else) th-cam.com/video/RaDvHyk8LOA/w-d-xo.htmlfeature=shared
One of the questions I was wondering myself for a long time thanks a lot, by the way when will you finish your cadetship ?
Sorry for the late reply, I am actually already a 3rd Engineer on a Cruise ship now haha time flies.
In some pumps there is an additional stuffing box between motor and pump. Are mechanical seals also used there or gland ropes?
Some very high pressure/torque pumps like boiler water circulation/feed pumps (which must overcome the preussure of the boiler inside) generally use mechanical seals and have an oil box that we must keep topped up and renewed after certain hours.
The glad rope you refer to is called packing. Which we cut various rope like pieces and "stuff" between the back of the volute casing and the shaft in an area we call the gland seal. They have lower working life than mechanical seals because they wear little by little because of friction however they are very simple to replace.
Wait, asbestos gaskets are still used?
It's true that they should be avoided but youd be surprised in the stuff that some ships use. It all depends on the quality of materials your provider gives.
U r fucking amazing enginer bro
😂Lots of room for improvement but it's a never ending battle, thank you brother
Hello
I want to install a water pump inside my house, can i put it inside a sound insulated box to contol the noise?
Depends on the area and surroundings, however a box covering the pump usually wont be a problem as long as you can access it later for maintenance as well as no obstrucions on the pipe lines.
How will we make sure that the gap between the stationary part and the rotating part is appropriate? Is there any way to measure is or we just assume it as per the amount of leakage or the previous marked position of the seal retainer?
The spring on the rotating side will expand with the force of the water flowing and it will push it the rotating seal to the stationary seal side..
The liquid seal will maintain a small distance between them.
Remember that when you put a new seal the bolts that clamp the gland seal are not tightened fully.. When you run the pump if you don't see any leaks (because spring and seals are new) you leave like that if you do see leaks you gradually tighten.
Im confused why the stationary and rotating cant touch each other.When assembly
What if you instlled them touching each other in the first place?
If the surfaces touch then there will be increased wear, ideally the small gap is sealed and lubricated by the perpendicular flow. If they touch of course they will seal however they will have lower life.
sauldos amigo me encuentro en canada y una empresa me esta dando la posibilidad de aprender este trabajo de reparar y testar bombas de petroleo entiendo que es lo mismo? para mi este rubro es nuevo.. la empresa se dedica a la mantencion y testeo de bombas este video me viene de gran ayuda espero aprender lo mas rapido posible es una gran oportunidad..
Hay muchos tipos de bombas. Estas son centrifugas y en algunos lados lo usan para descargar petróleo con turbinas (buques de crudo), pero en general para líquido viscosos como petróleo se usan bombas de desplazamiento positivo (tornillo, pistón, lóbulo, etc).
Hai
After long time ur making video... ✌🎉
Yeahh I got the urge to upload something haha 🤗
Make more videos of installing mechanical seal
Really? What else would need to be covered? I could make small clips but I think the theory is good enough in this video
@@ShrimptoShark small clips sounds good brother
@@debiprasadsamal8638small clip never sound good. Deatiales Explained is always helpful and as Engineer , don't go on small. Learn to see and understand big picture
kind
Thank you so much
👍👍
Sir, i am also 4 th engineer currently on board. Here purifier is not producing sufficient fuel to run the engine. What could be the reason .
Increase feed, check the bypass valve of feed pump if feed is not increasing.
Well David it could be a number of reasons, you should diagnose and troubleshoot for example is the fuel consumption usually high?, it's the back pressure on the purifier correct, if you increase output to the purifier by the feed pump there will be more back pressure unless you open more the outlet to service tank.
Is some flow going to the pneumatic three way valve? Back to the settling tank
Why did you stop videos?
I didnt stop, its a long term project, with more experience and time it gets easier
And no have bearings?
The wear rings are a type of bearing, the ball bearings however are in the electric motor side.
What is your current rank ?
I am a 3rd engineer Sr. at the moment
Dalhin mo ke anton, sandali lang yan
asbest? This is not alloud overhere... hamering on asbest whitout protection, this is crazy man.. At least protect yourself whit a mask. Over here only working on asbest whit a full airmask. and even that is not alloud. when you see asbest you must stop work and there wil com a special firm to clean is al.
I understand what you mean and yes if you work with asbestos gaskets everyday you should definitely wear protection. However onboard ships it is still commonly used and the danger is The cutting of the material and breathing in
@@ShrimptoShark please take care, it can take over 40 years before you could get peritoneal cancer. I not saying you wil, bud the chances are bigger when you used it, its scary stuff. That why, although asbestos is perfect stuff for many purposes, it is forbidden here.
Where does cooling water will go after coming between face of rotating seal and stationary seal ?
The liquid lubricating seal is recirculated from the gland seal to the pump suction and then back to the seal. (it can be a bit confusing because the arrows in my diagram show from suction to seal but it's backwards).
Fluid enters the suction side goes through the seal and out the connection back to the suction, and new water is constantly coming in from the suction side to avoid heating.
@@ShrimptoShark the new water which is going to gland is suction water or discharge water ?
@@ashishmishra2144 depends on the instalation however the one in the video is on the suction side.
@@ShrimptoShark okay I understood now. Thanks for answering with much love to you.
@@ShrimptoShark Can you please make dedicated video on incinerator working as practical in depth showing each thing and explaining how to adjust temperature in incinerator and how to start/ stop, importance of blower etc?
This pump have bearing or not. If have where is this? If don't have how is this?
The pump side has no ball / roller bearings however the wear ring I showed in the start is a sort of bearing (sacrificial peice) which keeps the shaft centered. There are two the one in the front (shown) and one in the back in the pump casing.
As I’ve noticed the auxiliary pipe is coming from inlet to the gland, the fluid that goes inside the pump is water so that means this API 13 mechanical seal the water goes from the gland to pump suction and not vice versa. Thanks for the video and the explanation.
Aye that is correct, as I grow in knowledge I start to view these things easier than back then. It's true the suction pressure is lower than that inside the gland (since it received pressure energy from the impeller) therefore fluids will always go to lower pressure.
As you say the flow will be from the gland to the tube and back to the suction creating a recirculation with new water each time.
Thank u sir. U are really good at teaching to others
I'm happy to read that, I try my best also onboard to share my love for mechanics. Success and nothing else
Super good I will subscribe
I appreciate it! Thank you for your support
2-3 drips a minute is gooch
Hahahha it's not bad but we try to keep leaks to a minimum
agradezco enormemente los subtitulos en español, muy amable!
no hay problema, me alegro que pueda ayudar a mis paisanos
Thnks u so much brother
I'm glad it was useful brother
So making a asbestos gasket without using gloves or a mask?
Yeah PPE is very important, you have a point.
Also using it on hot water pump... isnt asbestos carcinogen and banned from vessels?
Not at all.. It's still widely used at sea and at shore. If you work in this field and do a quick search online you can learn the status of this, they are called asbestos gaskets however the amount in then has been greatly reduced.
brilliant
Thank you for believing that
Very usefull. Pls do more videos like this
I'd be glad to continue sharing maritime engineering. It's a very fun project. Thank you for saying that they are useful 🤗
Çok teşekkürler. Faydalı bir video olmuş. İyi çalışmalar diliyorum.
Thank you my friend
Straightforward. Thank you boss
Thank you, it's my goal to make these complex things sweet and simple.
The faces do come in contact with each other, how else they are going to seal ?
No, the water flowing towards the gland pushes the mobile seal (it has a spring) back slightly.. And the stationary seal obviously is static. It's a veryyyyy small gap that is then sealed by the liquid lubricating seal you can see in the video.
@@ShrimptoShark noo brother, the spring is their to keep pressing the seal faces with each other. Water is there only for cooling purposes. If the water is going inbetween the seal faces, then what's stopping that water from going out through inside part of stationary seal?
These two faces must always have a positive contact with each other, but should ne be too much pressed against each other to avoid early weardown of seal.
I disagree, there is a very small clearance between the faces and while the liquid line serves its purpose of cooling it is directed in a way that prevents the flow from leaving this small gap. I'm not saying that the faces NEVER come in contact, they do and because of this they wear, but their design is to create this small clearance. What you say about the spring is also true.. There are forces acting on both sides however.
@@ShrimptoShark Brother I understand your point, but the thing you are talking about is not a clearance. While installing a mechanical seal, it is made sure that two faces are in contact with each other, but should not be forcing on each other too much. The water pressure from cooling water line automatically creates a very fine gap(even smaller than hairline) in between primary sealing faces which kind of acts as a lubricant for the faces. But it is not a clearance. Because if its a clearance left while installing, then two faces will never meet each other and it will never seal.
th-cam.com/video/__wqc1GfnZE/w-d-xo.html
I hope this video will clarify it :)
awesome instructions..
Thank you very much, I appreciate it.
Great video bud!
Thank you very mucho amigo
VERY CLEAR AND HELPFUL
Thank you, I appreciate your kind comment amigo.
ussr patch? wtf😂
Haha it was a gift from my old boss, and has a lot of meaning to me. I was actually born near this time
Superb bro
Thanks 🤗
Great job 👏
Thank you brother
Pretty Nice 😁
Thank you my brother 🤗
Great video.
Glad you enjoyed it amigo.
Need Safety Glasses. I am surprised the company allows you to work on rotating equipment without the correct PPE.
I won't deny the importance of PPE. Thanks the for comment and your opinion
Very good sir step by step watch and learn ...sir can you make one video for centrifugal oil pump 🙏🏽 help full for oil and gas plants interviews thank u
Bro. 🤦
Ive worked on those cargo discharge pumps FRAMO, its basically a submerged and multistage centrifugal pump however to maintain it is hard work.