Centrifugal Pumps and Mechanical Seals - Maintenance and Theory

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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!)
Follow me on other social media or send me a message
instagram - @Rafaelatsea
Facebook - Rafael Ishaan Perez
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Success and nothing else

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1 окт 2024

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Комментарии : 189

@joebertolandra6953 Год назад

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

@ShrimptoShark Год назад

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.

@mirenmorker1476 6 месяцев назад

Very helpful video

@Mark-cr7rg 2 года назад

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!

@ShrimptoShark 2 года назад

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

@Joakri8 2 года назад

Very good video, informative and helpful, cheers from a Norwegian Marine Engineer 😊

@ShrimptoShark 2 года назад

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.

@josephamati8572 Год назад

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

@_pushpak2510_ 25 дней назад

😭😭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

@ShrimptoShark 4 дня назад

That's the truth brother, success and nothing else and have a safe contract. Bless your hands on all your jobs.

@Πτυχιοποτε Год назад

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

@ShrimptoShark Год назад

You are very welcome and I am very happy to see that you liked them!

@francisregis3804 Год назад

This pump have bearing or not. If have where is this? If don't have how is this?

@ShrimptoShark Год назад

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.

@ashutoshrai2970 3 месяца назад

How do we ensure that gap between both the stationary and rotating part of mechanical seal.? Please tell

@ShrimptoShark 4 дня назад

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.

@TheeAceSiDeAL Год назад

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.

@ShrimptoShark 11 месяцев назад

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.

@thetnaungzaw774 17 дней назад

Thank u sir. U are really good at teaching to others

@ShrimptoShark 4 дня назад

I'm happy to read that, I try my best also onboard to share my love for mechanics. Success and nothing else

@apollomorella7324 9 месяцев назад

Dalhin mo ke anton, sandali lang yan

@SHUBHAM-KEENOO1 Месяц назад

EXCELLENT JOB EXCELLENT VIDEO GOD BLESS YOU, SIR

@ShrimptoShark 4 дня назад

God bless amigo, thank you.

@gonzalomonsalve3764 10 месяцев назад

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..

@ShrimptoShark 10 месяцев назад

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).

@johnsnow9224 10 месяцев назад

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.

@ShrimptoShark 9 месяцев назад

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.

@johnsnow9224 9 месяцев назад

@@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) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RaDvHyk8LOA.htmlfeature=shared

@makinista2541 2 года назад

Awesome video. very informative to all aspiring marine engineer. Thank you and god bless.

@ShrimptoShark 2 года назад

God bless my brother thank you very much!

@dmurray2978 Год назад

Best explanation of mechanical seals I've seen

@ShrimptoShark Год назад

That makes me happy to read..thank you

@humby123 5 месяцев назад

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.

@ShrimptoShark 5 месяцев назад

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

@alexmaccity 3 месяца назад

2-3 drips a minute is gooch

@ShrimptoShark 4 дня назад

Hahahha it's not bad but we try to keep leaks to a minimum

@verygoodbrother 5 месяцев назад

Wait, asbestos gaskets are still used?

@ShrimptoShark 5 месяцев назад

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.

@denizcracoglu6739 Год назад

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

@ShrimptoShark Год назад

I appreciate that! success and nothing else deniz, thank you

@brightonskiyi3769 11 месяцев назад

Super good I will subscribe

@ShrimptoShark 11 месяцев назад

I appreciate it! Thank you for your support

@olaola5889 Год назад

agradezco enormemente los subtitulos en español, muy amable!

@ShrimptoShark Год назад

no hay problema, me alegro que pueda ayudar a mis paisanos

@UppadaYuvaraju 9 месяцев назад

Hai

@syedhuzaifa4163 2 дня назад

Good explanation , way to go shark.

@Bbala5079 Месяц назад

Thnks u so much brother

@ShrimptoShark 4 дня назад

I'm glad it was useful brother

@kingshukchowdhury898 Год назад

Why did you stop videos?

@ShrimptoShark Год назад

I didnt stop, its a long term project, with more experience and time it gets easier

@joshuap7396 Год назад

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?

@ShrimptoShark Год назад

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.

@chrischan256 10 месяцев назад

thank you Sir

@ShrimptoShark 10 месяцев назад

Most welcome buddy

@samuelschultz1760 Год назад

Excelente explicación paisano!! Cada día representando a nuestro país con talento!!

@ShrimptoShark Год назад

Agradecido amigo, siempre exito colega

@joscis5870 2 года назад

Thank you for sharing this knowledge.

@ShrimptoShark 2 года назад

Knowledge should always be shared success and nothing else!

@kryptonian1371 9 месяцев назад

brilliant

@ShrimptoShark 7 месяцев назад

Thank you for believing that

@chrisleon27 Год назад

Hello from China ,ur talk is quite stabilized and slow motio~ed ,it's quite a unique style

@ShrimptoShark Год назад

Hahah thank you Chris! Ive heard of that before

@frank6048 10 месяцев назад

El compa de OpenEnglish despues de finalmente tomar el curso de ingles. Saludos, bastante útil para saciar mi curiosidad, gracias por este excelente recurso.

@ShrimptoShark 10 месяцев назад

Hahaha el inglés abre muchas puertas y caminos.. Esta me llevo al mar. Feliz de despertar curiosidad

@azzishusien 6 месяцев назад

kind

@ShrimptoShark 5 месяцев назад

Thank you so much

@lionsofafrica5867 Год назад

Çok teşekkürler. Faydalı bir video olmuş. İyi çalışmalar diliyorum.

@ShrimptoShark Год назад

Thank you my friend

@tylerammons517 Год назад

So making a asbestos gasket without using gloves or a mask?

@ShrimptoShark Год назад

Yeah PPE is very important, you have a point.

@onuryldrm3508 Год назад

Also using it on hot water pump... isnt asbestos carcinogen and banned from vessels?

@ShrimptoShark Год назад

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.

@mirmuhib2849 Год назад

In some pumps there is an additional stuffing box between motor and pump. Are mechanical seals also used there or gland ropes?

@ShrimptoShark Год назад

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.

@CER656 Год назад

Very well explained thank you

@ShrimptoShark Год назад

Thank you

@orchard75 Год назад

Hello I want to install a water pump inside my house, can i put it inside a sound insulated box to contol the noise?

@ShrimptoShark Год назад

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.

@kamarulnizam6882 2 месяца назад

thanks man

@ShrimptoShark 4 дня назад

I appreciate that bro, success and nothing else

@wahidnurrohman8675 6 месяцев назад

Exellent explanation, keep up the good work Sir. Good Job

@ShrimptoShark 6 месяцев назад

Thank you, I will try my best to continue even in my new environment cruise ships.

@amicheal1405 2 года назад

Very usefull. Pls do more videos like this

@ShrimptoShark 2 года назад

I'd be glad to continue sharing maritime engineering. It's a very fun project. Thank you for saying that they are useful 🤗

@pukkalamadhu1708 Год назад

U r fucking amazing enginer bro

@ShrimptoShark Год назад

😂Lots of room for improvement but it's a never ending battle, thank you brother

@pierrereneerkens7671 Год назад

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.

@ShrimptoShark Год назад

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

@pierrereneerkens7671 Год назад

@@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.

@1vygail 2 года назад

long awaited new video sir. thank you 🙂

@ShrimptoShark 2 года назад

No problem success and nothing else! 🤗

@toroitichpatrickyegon4866 Год назад

This is beautifully presented. I need to up my presentations this far

@ShrimptoShark Год назад

Success my friend, I hope you are always able to share your stories.

@rutebemberwajoshua6900 7 месяцев назад

Straightforward. Thank you boss

@ShrimptoShark 7 месяцев назад

Thank you, it's my goal to make these complex things sweet and simple.

@jocosabyahe3230 Год назад

More power :) solid video waiting for another video :) #shrimpmates #sharkmates

@ShrimptoShark Год назад

Jocooooooooo, success buddy, thank you for helping me in a wonderful contract on the Carnival Dream, I hope you are well.

@ngocthienho1009 Год назад

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.

@ShrimptoShark Год назад

I hope you are always learning and growing my friend.

@robertdascalu5498 2 года назад

One of the questions I was wondering myself for a long time thanks a lot, by the way when will you finish your cadetship ?

@ShrimptoShark Год назад

Sorry for the late reply, I am actually already a 3rd Engineer on a Cruise ship now haha time flies.

@jjlm218 Год назад

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 !

@ShrimptoShark Год назад

Exito colega, el aprendizaje y refrescamiento es importante, me alegra que esto sirva para afilar el conocimiento previo.

@zulhairyzainal1674 6 месяцев назад

Very Good Information bro...very informative and good demonstration..

@zulhairyzainal1674 6 месяцев назад

Next week i will be Traning Engineer on board....hope can be like you

@ShrimptoShark 5 месяцев назад

With curiosity and hard work you will make it don't worry it's a good job.

@MenMarblogs 10 месяцев назад

Thankyou so much more videos ❤❤❤

@ShrimptoShark 10 месяцев назад

For sure, every time I can share something I will 🤗

@apoorvbharadwaj7156 2 года назад

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?

@ShrimptoShark 2 года назад

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.

@عليعلي-ط9ج8ظ Год назад

Your explaining and working are very useful

@ShrimptoShark Год назад

Thank you amigo, i appreciate it.

@user-unji5h2k3nw69 Год назад

good

@saveelfayas7741 2 года назад

Very informative. Expecting more videos

@ShrimptoShark 2 года назад

Sure step by step, thanks for the support!

@mikel3670 8 месяцев назад

Great video! Thanks for taking the time to make it!

@ShrimptoShark 7 месяцев назад

It's my pleasure and happiness to see that the video is useful.

@pierrereneerkens7671 Год назад

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.

@ShrimptoShark Год назад

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).

@pierrereneerkens7671 Год назад

@@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.

@sudhakarcvcv1776 5 месяцев назад

Very nice explanation of topic

@ShrimptoShark 5 месяцев назад

I'm glad it was of use amigo

@David-zu7cg 2 года назад

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 .

@harmeet094 2 года назад

Increase feed, check the bypass valve of feed pump if feed is not increasing.

@ShrimptoShark 2 года назад

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

@jidendrap3745 2 года назад

👍👍

@rezahezkia7019 9 месяцев назад

Thankyou for your information Sir

@ShrimptoShark 7 месяцев назад

Thank you for your support

@kvong615 Год назад

Thankyou!!! Great video

@ShrimptoShark Год назад

Thank you for the kind comment

@josearniella8015 Год назад

Realmente te quedó muy bueno el vídeo!, 👍

@ShrimptoShark Год назад

Agradecido jose, exitos siempre amigo.

@uncommonusername2507 Год назад

awesome instructions..

@ShrimptoShark Год назад

Thank you very much, I appreciate it.

@amitsinha6572 Год назад

What is your current rank ?

@ShrimptoShark Год назад

I am a 3rd engineer Sr. at the moment

@emacflores7914 Год назад

Great video bud!

@ShrimptoShark Год назад

Thank you very mucho amigo

@harmeet094 2 года назад

The faces do come in contact with each other, how else they are going to seal ?

@ShrimptoShark 2 года назад

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.

@harmeet094 2 года назад

@@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.

@ShrimptoShark 2 года назад

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.

@harmeet094 2 года назад

@@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. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-__wqc1GfnZE.html I hope this video will clarify it :)

@alfonsojuniorjimenezrossi8228 2 года назад

And no have bearings?

@ShrimptoShark Год назад

The wear rings are a type of bearing, the ball bearings however are in the electric motor side.

@ElMarinero77 Год назад

ussr patch? wtf😂

@ShrimptoShark Год назад

Haha it was a gift from my old boss, and has a lot of meaning to me. I was actually born near this time

@呂和霖-m5g 10 месяцев назад

VERY CLEAR AND HELPFUL

@ShrimptoShark 10 месяцев назад

Thank you, I appreciate your kind comment amigo.

@Eternal_Sailor 5 месяцев назад

Superb bro

@ShrimptoShark 5 месяцев назад

Thanks 🤗

@aneesharis4661 Год назад

Very helpful sir

@ShrimptoShark Год назад

Heya bro! Im glad it could be of use, thank you for the support.

@NathanNew-qb8cg 6 месяцев назад

Great job 👏

@ShrimptoShark 5 месяцев назад

Thank you brother

@debiprasadsamal8638 2 года назад

Make more videos of installing mechanical seal

@ShrimptoShark 2 года назад

Really? What else would need to be covered? I could make small clips but I think the theory is good enough in this video

@debiprasadsamal8638 2 года назад

@@ShrimptoShark small clips sounds good brother

@ashishmishra2144 11 месяцев назад

@@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

@celiscyrus2621 2 года назад

Thank you sir !!!

@ShrimptoShark 2 года назад

Success my friend!

@venkannabandhu467 2 года назад

Very good video

@ShrimptoShark Год назад

Thank you

@abrahamromero6670 2 года назад

Pretty Nice 😁

@ShrimptoShark 2 года назад

Thank you my brother 🤗

@Richard28012009 Год назад

Excelente

@ShrimptoShark Год назад

Agradecido por su apoyo

@jayallen426 10 месяцев назад

Great video.

@ShrimptoShark 10 месяцев назад

Glad you enjoyed it amigo.

@Insaniyat_2793 2 года назад

After long time ur making video... ✌🎉

@ShrimptoShark 2 года назад

Yeahh I got the urge to upload something haha 🤗

@mjsjamaica 10 месяцев назад

Need Safety Glasses. I am surprised the company allows you to work on rotating equipment without the correct PPE.

@ShrimptoShark 10 месяцев назад

I won't deny the importance of PPE. Thanks the for comment and your opinion

@billyphyo5361 2 года назад

I am studying for engineer of watch exam. Your videos do help me. Ready for your next videos bro

@ShrimptoShark 2 года назад

That's the idea my friend. Success and nothing else in becoming a great engineer 💡👍🏾

@sudhakarsolomonnakka Год назад

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

@sheesh1706 Год назад

Bro. 🤦

@ShrimptoShark Год назад

Ive worked on those cargo discharge pumps FRAMO, its basically a submerged and multistage centrifugal pump however to maintain it is hard work.

@ashishmishra2144 11 месяцев назад

Where does cooling water will go after coming between face of rotating seal and stationary seal ?

@ShrimptoShark 11 месяцев назад

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.

@ashishmishra2144 11 месяцев назад

@@ShrimptoShark the new water which is going to gland is suction water or discharge water ?

@ShrimptoShark 11 месяцев назад

@@ashishmishra2144 depends on the instalation however the one in the video is on the suction side.

@ashishmishra2144 11 месяцев назад

@@ShrimptoShark okay I understood now. Thanks for answering with much love to you.

@ashishmishra2144 11 месяцев назад

@@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?