What is Bumping Clearance and Clearance Volume?? Compressor Damages

What is Bumping clearance ??
How is Bumping Clearance measured??
What is clearance Volume in compressor ??
What is the effect of bumping Clearance on performance of Air compressor??
When will bumping clearance change and what are the effects??
This video deals with the topic of #BumpingClearance and #ClearanceVolume in a Marine Air Compressor.It also looks into some possible compressor damages associated with this .It also highlights the importance of Gaskets in Air Compressors.This a part of Marine Engineering Training Animated Videos from #RMETC videos.
RMETC is a consultancy company for Marine Engineering Training specializing in conducted workshops on Hydraulic Failure Management Courses for various shipping companies, for their international crew. More details at website rmetc.co.in

[@chandradarmarajan8768]

You are like a gem in the marine industry and very hard to come by. Your have combined the use of simple sketches , underlying concepts and clear explanation with a tinge of comedy ; all within a span of a handful of minutes. Our devoted attention is most guaranteed. This is exactly what we need because it really takes away the mental stress and boredom that sets in when we try to make sense out of lengthily explained texts , overly detailed manuals and construction drawings .

[@shankarrams3834]

Ramesh good one. To be simple clearance vol measured in cubics where as bumping clearance in mm(linear). Normally the con. rod is integral part of bottom end bearing. So shim insertion point cannot be done. In one case I heard while assembling one cyl head nut dropped inside and no one was aware. At the end they replaced a nut from spare thinking the lost nut might have gone to bilges. On starting they had a bang and piston damage. One more way of breaking compressor. So good practice is after o' haul try compressor for its free rotation manually

[@shahrozfareed9901]

thanks for clearing the concept b/w compress and displace

[@ashishr5855]

Thank you sir for passing on such a great eye opening knowledge 🙏

[@johnsnow9224]

Crystal clear explanation💯 with some funny elements 😅 13:02

[@SanjayYadav-qu1mf]

Please keep posting the videos sir. You teaching style is so simple and interesting. Thankyou sir for all these videos and for all the future videos also

[@eshd8116]

Please sir do more videos like this kind of explanations. And what a explanation.

[@nipunsadana272]

thank you sir for so amazing videos and sharing your knowledge, wish to see a lot more about everything you have experienced in your carrier.

[@sanyammoudgil8339]

Brilliant explanation sir !! Thank you soooo much❤

[@eshd8116]

Excellent sir. Excellent sir excellent sir. Please do more more more videos

[@mishelmathew7193]

Very useful sir

[@randomtakes8259]

Best of chief engineers out there 👍🏼

[@anandsagar9132]

Excellent explanation ... Thanks sir

[@anshuvash1385]

Very well explained. Thank u bada saab

[@shankaranand1139]

Sir ur videos are like magic....sir plzzzzz plzzzz make more videos..

[@nuwanappuhamy428]

Thank you sir.. Nuwan from Sri Lanka

[@prigilarakkal5538]

Great work sir, thank you very much❤❤

[@kartikbhtt]

Perfect video sir.. thanks...

[@danishmomin8102]

Thankyou chief.

[@Sandeepsharma-gl1gj]

Great explaination sir 🙏🙏

[@ArjunKumar-hf4tp]

Great explanation sir. Waiting for your next video

[@RohitKumar-uk9zr]

Thank you sir

[@realtruth4945]

Great. Learnt a new thing today. Compressor piston displaces, engine prison compresses.

[@rmetcvideos]

Ha Ha

[@SaurabhSingh-ou3xr]

sir thanks to you for delivering such videos pls explain the working of tandem compressor

[@amaranand2871]

Nice video sir...waiting for more videos to upload .... stay healthy sir

[@anbuaravindhan6951]

thank u so much sir,great explanation

[@Nagaraju8700]

Very useful and excellent animation sir 👌

[@sharanrao3863]

sir, request you to please make such technical videos. Your videos are much effective while learning

[@vooo26]

Thank you so much sir...

[@srinivasanthayyil3031]

Nice animation. All air/gas compressors follow law of thermpdynamic. There are various reasons for compressed air getting overheated. Hope you may discuss in future videos.

[@ZeeshanAhmed-nj5zh]

Maa Shaa Allah... Incredible sir... Keep it up

[@shippinginbox]

Used ship machineries from Alang ship breaking yard 🙏 #ShippingInbox

[@gkscosmos]

This video is really good and nicely explained Pro tip:- watch it at 1.5x speed.... Thank you bada saab ⚓⚓⚓

[@rohitkiroriwal7366]

Good video , descriptive

[@manikandansekar1212]

Thanks a lot sir....well explained 👍

[@avinashkanesen53]

nice,informative video

[@MrAttitude45]

Brilliant video sir. Great insight. Kindly make something on the PURIFIER on board.

[@JILLUNILA-es7nj]

Very very useful ❤❤❤❤❤

[@siddhushah007]

excellent explaination..please make video for major overhauling of compressor.

[@94winga]

Very nice

[@shashikumar3413]

Thank you sir..

[@vaibhavtandon3572]

Very interesting

[@raviupadhyay3252]

Thankyou very much Sir for this video, its very great that you are sharing your experience which we might face in our life and due to these videos, we will always remain vigilant about these situations. Thankyou Sir.

[@rmetcvideos]

All the best

[@subramoniam100]

very good video sir...waiting for ur for videos on main engine troubleshooting

[@PramodKumarSahu]

today is my exam sir thank you so much for these videos

[@najink2049]

Very useful video sir. Please keep making such practical oriented videos.

[@rmetcvideos]

Sure 👍

[@bikramsinghvlogs6282]

Nicely explained sir, please enlighten us with your knowledge on capacity control in refer system.

[@shekharbhardwaj3424]

sirr u are awesome 💓💓

[@arunsudhakaran9968]

Really thankful to you for these excellent vedios which make us feel so confident about the topics...jus awesome sir...keep going ,need it infinite

[@rmetcvideos]

🙏

[@avinashchaurasia7031]

Sir your way of teaching is really amazing ...

[@rmetcvideos]

Thanks a ton

[@mandaradhikari1424]

Excellent sir really helpful to improve our knowledge please make video on types of rudder and difference between them.

[@wildernessbliss7021]

Very innovative lecture sir very useful and handy both for exams n practice..thank very much God bless you

[@rmetcvideos]

Thanks and welcome

[@devendharans6502]

Tq so much sir

[@rabusekergilbert9751]

Thank you so much sir . Your videos are awesome.

[@rmetcvideos]

Thanks and welcome

[@rohitrawat7792]

Brilliant video.. right to the point.. very well explained.

[@rmetcvideos]

Glad you liked it!

[@satishmaurya8799]

#DMETian 🙏

[@sailoralpha9430]

Welcome

[@parameshwaranp943]

Sir I understand very vell sir please give video about an purifier

[@NituKumari-mc6rq]

Very nice lec sir plz make purifier lec...

[@mayureshchaphekar752]

That's really a commending efforts for making such a knowledgeable videos with inclusiveness of minute detailings. Keep it going sir. If its not too much of a trouble for you, would you make videos on generators as well.

[@rmetcvideos]

So nice of you

[@nyanlin770]

thanks u so much..i attended your hydraulic training in Yangon..last year. I gained a lot of knowledge sir.

[@rmetcvideos]

Tnks.Hope you found it useful on ship.I really enjoyed my stay there..Really love Mahabandula Road...my regards to Capt Tin Oo and Mr Thaung Aye...please share with your friends...

[@nyanlin770]

@@rmetcvideos thanks sir. glad to know that you enjoyed your stay while in Yangon. please make more and more educational videos sir. your experience are very valuable and beneficial for junior marine engineers sir.

[@anujmane]

Great video sir 👍👌

[@rmetcvideos]

Thanks 👍

[@akashg1068]

sir please explain about loading and unloading of compressor

[@RajeshKumar-mt3pg]

Sir Make a video on intercooler and aftercooler, and how unloader actually works

[@sairajshenvi3120]

Sir plz made a video on working of main air compressor unloader valve

[@mihirtandon5170]

Good explanation sir. 👍 Kindly make a video on starting air distributor(construction) and it's position in the engine. And how is it reversing in old and new engines.

[@rmetcvideos]

As soon as possible

[@eshd8116]

Please do more and more videos sir. Please sir do more videos

[@rmetcvideos]

Thanks..pls do share these videos in Srilanka amongst your friends..

[@najinkunnath6009]

An excellent helpful safety tip about bumping clearance which books don't give us. Sir, please make a video on thermodynamic importance of external equalising line in refrigerator TXV.

[@rmetcvideos]

Sure I will

[@SanjayYadav-qu1mf]

Yes sir please make one video on this topic because there is no explanation on this anywhere

[@satishmaurya8799]

Why do we use plate type valve having many plates ?

[@ankuryadav2711]

Very interesting Video sir, i used to think like if the bumping clearance increases then clearance volume will increase and thus more trapped air which cannot be pumped out , and which will affect the volumetric efficiency as those trapped air will not allow opening of suction valve till the time the pressure of trapped air falls below of atmospheric suction pressure.

[@rmetcvideos]

What you thought is correct...i guess ..thats exactly what we have also said in the video🤔

[@mdaburaihan4650]

What if the piston crown is not even/flat? If the crowd has concave surface then the measurements will not be same in all positions.

[@mechanicalengineeringtutorials]

Sir why do we take bumping clearance only in compressors and not in auxiliary engines and main engines.

[@pranayghadigaonkar5227]

In M/E or A/E we don't have the gap between the cylinder head and top dead centre of the piston bcoz in Engine the combustion takes place after combustion every gas present should get exhaust so if we keep clearance in engine the whole process will disturb n efficiency of the engine will drop. That's the reason their is no bumping clearance in Engines

[@pranayghadigaonkar5227]

Correct if wrong

[@deependranegi7822]

sir do we need to push con rod towards top while at tdc ??

[@deepakshanmughan7928]

Thank you for the video sir... I have a humble request for you... Can you please make a video on main engine fuel pump overhauling of main engine... By seeing the things by cartoon helps to understand things in a much easier way... Thankyou for making a new revolution in teaching sir.

[@rmetcvideos]

There are Many many ME videos and also Ohauling videos. Do you think it is worth the effort to repeat topics which are abundantly available on the net ?? ANyway, Time permitting i will keep it in mind

[@deepakshanmughan7928]

@@rmetcvideos I strongly believe it will be worth

[@ladakshay300]

Well explained ,sir can you tell us more about Free air Delivery and thus this is called the efficiency of the compressor?

[@rmetcvideos]

A compressor is a displacing device. The capacity of a compressor is obviously measured in Volume of Ar it can displace. Now , what is the volume of air a compressor can displace??. it is obviously the Volume of Air ENTERING the LP cylinder when Piston is at BDC. Now This air is obviously the FREE AIR, or the Air available at atmospheric pressure and temperature in the vicinity of the Air Suction Filter. Hence we always describe the compressor capacity in terms of FREE AIR DELIVERY. Otherwise it would create confusion..becoz Volume of Air depends upon the Pressure and Temperature of Air...which obviously keep changing. See our question ..You used the wrong term.FAD is CAPACITY of compressor.. not Efficiency.. Efficiency is the theoretical Volume of FAD which it is designed to displace to the ACTUAL volume ( FAD) it is displacing.

[@rajasekar5917]

Maine engine trouble shooting video sir...

[@vigneshgunalan534]

many thanks for the video sir !!! since you explained that air compressor just displaces the air not compressing ,i have one doubt if the air bottle pressure is zero and we want to top up . now when we start the compressor what would be 2nd stage pressure by that time? #chiefengineersteatimetalk

[@shamsheerahammed3475]

Plz add more videos sir

[@rmetcvideos]

Surely want to, as soon as I get some time for creativity :-)

[@satishmaurya8799]

Sir please make a video on Purifier gravity disc size and its effect on Purifier performance ?

[@rmetcvideos]

will make sometime in future when time permits

[@JabezShiyan]

Really nice video... Sir, if u can make a video in VIT vs Super VIT it would be great Waiting for ur next video

[@rmetcvideos]

sure.. its time will come

[@JabezShiyan]

@@rmetcvideos Eagerly waiting for that topic.... I really enjoy all your video.... 😇🙏

[@sivarajanradhakrishnan6410]

Nice one sir. Do we have any way to check the non return action of the compressor valves?? Do we need to check it??

[@rmetcvideos]

yes, better. Normally pouring water and checking should be enough unless you make a special tool.

[@sultanhussain6051]

Bda sahab kindly share ...but video in parts as convenient, Regarding VIT , Super ViT, of both MAN B&W, and Sulzer Thanks.

[@rmetcvideos]

will do..making vidoes takes a lot of time.But I will

[@mudassarkhot8812]

👍👍👍

[@ra.rajawat]

Why bumping clearance is only in air compressor not in ac compressor or generator ?

[@sairajshenvi3120]

Sir plz make a video on comparison of refrigeration unloader valve and main air compressor unloader valve... Loved watching yur videos. Thank you for guiding us...

[@rmetcvideos]

will trya and get some material. I guess in Compressor, you can unload by Puncturing or by Daring., whereas in REf we cannot have a option of draining.

[@oualidmokhchy7042]

Chief we found water mixed with oil in sump in our 3 stage compressor air cooled . What cd be the problem ?

[@rmetcvideos]

I can think of Cooling water ingress through hair line cracks in entablature..Blow past of air thru piston and eventual condensation...may be mor reasons also

[@verminer7]

But if xompressor doesnt compress it only displace, how come multi stage compressor actually compress first stage 5 bar and second stage 30 bar? U have gauges to check those also on the air compressor

[@rmetcvideos]

Ha Ha...You cannot DISPLACE unless you compress to overcome the back pressure. That is why you always see that compression happens and the pressure developed depends upon the receiver pressure.

[@sultanhussain6051]

Sir , one more thing , regarding compressor valve seat lapping , though we lap seats , as I remember , but lapping is also reducing the thickness of the seat in turn reducing the efficiency as a whole kindly put light on this . Thanks

[@virendradubey3886]

There is a limit for lapping plates. But generally now a days company provide plates inspite of full valve. So better to change it

[@rmetcvideos]

I am intending to make a small clip on this.But in the meantime..my opinion is not to lap too much.You dont gain much , but definitely eat away the seat.A light lapping is ok. even if valve leaks by an occasional drop of water ( water test)i think its OK.

[@sultanhussain6051]

@@rmetcvideos Thanks alot bda sahab , please take your time and try to cover All topics , Specially , Stern tubes, arrangements , normal , and in Emergency, Bolier improved high lift safety valve settings, etc .

[@kislaymishra6846]

✌️✌️

[@najinkunnath6009]

How can we do pressure test of intercooler and aftercooler onboard ? How to know whether the cooling water flow is correct ?

[@rmetcvideos]

well a bit tough. Need to blank off and hold pressurized water and conclude basis drop in water pressure and the time taken for the pressure drop and also observe the Drains. Cannot SEE the leak.Hence can only be done Indirectly. If leak is suspected and you have a strong reason then you probably need to remove the tube stack and make a special, tool with available material to locate the leaky tube.Maybe I should make a video to explain better

[@adarshwarrier6281]

Sir Its known that as the clearance volume decreases, it increases our volumetric efficiency. As far as my understanding the following are the meanings for these terms: 1) Volumetric Efficiency - The vol. of air actually swept inside to the theoretical vol. of cylinder. 2) Clearance Volume- The diff. between the actual vol. of the cylinder and volume swept by the piston when it is at TDC 3) Compression ratio- The ratio of total vol. of the cylinder ( swept vol. + clearance vol.) to the clearance vol. So whenever we decrease the clearance vol. both vol. efficiency as well as compression ratio should increase. Now interestingly i found on the internet that compression ratio varies inversely with respect to vol. efficiency, but i couldn't decipher how this is possible. Is this true sir ? If so please explain the reason behind it?

[@rmetcvideos]

can you pls send me the link where you read it??lets see in what context he says

[@adarshwarrier6281]

@@rmetcvideos www.examveda.com/the-volumetric-efficiency-of-compressor-with-increase-in-compression-ratio-will-57868/ sir, there is no explanation, its just a question answer.

[@ZeeshanAhmed-nj5zh]

Why is Bumping clearance not adjusted on one stage alone ?

[@rmetcvideos]

The idea is to dispalce as much Air as possible to the AIr Bottle. SO If bumping clerance is not adjusted in 2nd Stage, part of the air will remain in 2nd stage. SO the amount of Air which will get into the 2nd stage from 1st stage will be lesser . Unless you adjust 2nd stage , there is no benefit is adjusting 1st stage

[@rishabhsaxena3769]

Amn back pressure cannot happen because , NON RETURN valve is placed b/w air bottle and compressor

[@rmetcvideos]

Ha Ha..When the compressors starts the NR Valve opens and then what ??? Backpressure always acts when Compressor is PUMPING

[@nightryder9949]

Back pressure is there always after the unloader is closed. Since the NRV is in open position and the volume of the air bottle is more.

[@user-cy4bd3wp6t]

How to measure bumping clearance from crankcase? Is there any method sir ?

[@rmetcvideos]

not a greart idea..but if some one challenges you..Then ---remove the Bottom Half and measure the lift with Dial Gauge 😄

[@mrbablooyt7174]

Bumping hit prablam

[@sambitdash1585]

thank you sir

[@ashishkhatik7631]

thank you sir

[@ankanbhattacharjee1128]

Thank you sir