It seems that many want to know why it crashes in the turbo. This phenomenon occurs when you release the throttle too fast on a big engine. If the turbo from the start has a high speed, it takes a long time for it to rev down, and when there is no longer as much air intake to the engine, it becomes a high pressure in the inlet manifold. This air has nowhere to go except back through the turbo and air filter. This is going very fast, and therefore, there is a bang as we see in the video.
As a former ship's captain I can assure you that in the old motor ships of the nineteen forties and fifties-I mean ships that were already twenty to thirty yearws old the noise in the engine room was deafening.Air full of fumes;blast injection was the worst;the noise was incredible but our engineers went through this,year after year with no apparent ill effects.
I have worked at sea since 1993 and I have my chiefs tickets as well as degree in thermodynamics, so In answer to your question yes I have worked on a ship and it really is a cunt of a job. :-)
@fetufab LOL - yea I agree with your description of the job... I vowed never to pick up a spanner ever again..hahaha...the deal breaker was my last trip when I was stood in the crankcase taking an oil bath with lube running over my face and specs...down my boiler suit and into my pants. Great.
that is a cool clip of a Mitsubishi turbocharger "surging". That is a condition that happens during sudden unloading/decelleration of the engine. A crash stop is almost never performed unless for regulatory testing. A ship will never slow down the engine that fast under normal conditions.
Im Marine engine mechanics train to operate, inspect, test and perform corrective and preventative maintenance on marine equipment, can anybody help me get onboard.
i want to be a ship mechanic and i heard u must do an apprenticeship for 3 years to get a ship mechanic then u can do an exam for 5 years to get first officer on the bridge or leader of the machine room and u must do another exam forthe captain
i am student of maritime uniwersity and i whink will be better if you go studying if you want to get on board as mechanic. unless you go to school you will must work as motorman vory long time.. and i dont think that you will get on higher rank on board. the most important is certificate experience you will get on board. regards from poland
Depends on the country. in the UK it's a little over a 3 year course that does time at uni covering all the maths and mechanics and at sea to do the practical stuff. This is followed by a final oral exam for 4th officers ticket.
You then have to have more sea time and pass further orals and written exams to gain rank to 3rd, 2nd& chief officer. u cannot become captain as an engineer!
If u join be sure to work on plenty of maths as you will need to be about A-level standard to get through!
Turbocharger surging was caused by fast load drop. Excessive air that was kept in the air receiver was blown through the turbocharger compressor. This happens because of long reaction delay between exhaust gas system and scanvenging air system.
The Engine room controls everything on a Ship. Everything. One cannot even shit legally at sea without engineering. All anti pollution and environment protection equipment is engineering based and in the E/R. Loading is Engineering. Discharging Cargo is Engineering. Moving ships is Engineering. Steering ships is Engineering. Making water or Power is on board is Engineering. Ship Captains know nothing on these. They don't even navigate as pilots are assigned each port. Grade 3 level job: Captain
thats right,a ship whit out engineer it's only a piece of steal that float....olso a child can use a modern system on the bridge...ma no one can repair it if is not a engineer whit two big BOX!!!!i did not start to talck about E.R.because only small people can understand what i'm talcking about...and i think you are one of them....
Engineer are the blood,the heart,and the head of th ship....the bridge is only the eyes.....
So tell me what skill set is really required to steer ships from point A to point B? A grade 3 child can do that. You really don' need much of an education or high skill level to do that. The operational shipping industry is retarded because of the present command based set up on board. Industries on shore discarded this type of management set up last century.
I'm a engineer on ship. Wheelsman steer the ship and are usally a GP ( general purpose watch keeper). And yes theres hardly any education for such position. However to be classed as an officer, either deck or engine room, you need a university degree in some countries or 3.5 yr advanced college degree.
so unless you can do thermodynamics, physics, chem, calculus and countless other courses i wouldn't be saying to much.
Deck people as per STCW don't require a degree. They start on deck chipping, painting, learnin to plot a position on a chart (you can learn that in less than 10 minutes). Greasing on deck is an important job. Also cleaning hatches. Ask any Captain to trouble shoot a problem on board. His natral instinct will be head to the telephone and ring up C/E or ECR. Fact.
In order to steer a ship yes, you dont need special skills. BUT in order to learn HOW to steer a ship and be able to explain and most importantly to understant the reactions of the ship is a total different story. Excuse me but, you are totally wrong. Nick, Naval Architect and Marine Engineer, NTUA.
as the engine slows down there is a pressure build up that exhausts back past the compressor turbine releasing the stored energy. the noise can be heard outside the engine room. this only happens when the fuel has been shut off either by the governor or control
Surge can raise the pressure of the air to a level which can be destructive to the engine. It happened because of the sudden decrease of engine's RPM during crash stop test.
is the large grey cylinder the air intake? if so why is not a duct going topside? it would seem that if you were to accidently isolate the engine room somehow, that you would pull a mighty vacuum and probably die... just curious:)
The large "grey cylinder" is actually the compressor housing and air filter of an extremely large turbo. Engine rooms such as this are normaly well vented.
Actually it's not a filter, but a silencer...it does not filter the air, it has a real open structure...It only makes the noise somewhat bearable...;)
my engine room is very well ventilated. One of the doors to the purifier room actually bows due to the huge pressure difference across it. it actually broke open one day, and nearly killed a cadet standing behind it. So let that be a lesson to you all!!
Bark! 9/10 times the turbo is going to surge during a full ahead-to-crash astern. yes, it strains the rotor, and something could catastrophically fail, but these engines are designed to "limp" at reduced operating speed w/o a turbo. Had I a choice of disabling the turbo vs. pulling a piston with broken rings or worst a skirt (at sea), ill take the former. I once had to "hang up" a con-rod due to a failed crankpin bearing, thankfully in calm seas.
i beleave they do where ear protection but than in the form of props inside there ears.
and not the things (dont know the word) you put over youre head, because they wouldent hold. the sound of the video is just a thenth of the true sound this engine makes.
The castings on these turbochargers are made to keep all debris inside, in case of explosion. However, it's never fully save to stand close to a turbocharger in operation, especially when the throttle is brought back to zero in an instance...then the turbo is still pumping air, but the pressure can't escape, so it boosts back trough the filter/silencer.That's why the pringles-can is thrown back.
Didn't mention that this engine would have one, actually not many larger engines have one, but responded to 'Bartjoohs' question about a spring-loaded valve wich regulates turbocharger-boost...
Ive worked on an engine same as this probably same model 7 cylinder B&W 800mm bore prolly about 32000 horse, looks like a peak pressure test he is doing under full load and they have brought the throttle back to zero, this engine does not have a wastegate!
Besides, a waste-gate does not blow off, it just provides a short-cut for the exhaust gasses by letting them pass without flowing trough the turbine-side of the turbo so they won't power the turbine any longer...And less flow trough the turbine-side will cause less pressure on the compressor-side...
A wastegate isnt just there to produce sound, its there to prevent overboosting which leads to catastrophic engine failure caused by detonation due to the motor being fed too much air, its opened by a pressure driven actuator on the exhaust side which opnes a poppet valve in the turbine housing or on the manifold itself which vents off excess gas preventing the turbo from spooling any faster.
Since diesel engines work by detonation, I'm not sure what you mean here. Are you translating your spark ignition petrol engine experience to this beast?
Well, in my opinion a diesel engine does not work by detonation. It is self-igniting due to high pressure and temperature, but detonation is something you don't want to happen in your engine...It wrecks everything...
Well it's kinda hard for me to explain it in english, but what I mean is that the intake air at a certain pressure opens the springloaded wastegate wich allows exhaust air, wich normally spoken powers the turbine, to pass the turbine without powering it.
Iunderstand what you mean. that's my sugestion here. indeed not for the 'sporty' sound. But for the technics: ensuring the safety of the engineparts. perhaps such a valve would just be to expensive to install? considering that such a emergency stop is very very rare occasion.
what language do you speak weedeatertijs? NL, that's my 1st. language...
But when intake pressure gets too high, it opens (it's spring-loaded) and allows an amount of intake-air to pass the turbo without powering the turbine, the intake-air then flows directly to the exhaust system so it doesn't push the boost further up.
This is a case of turbo charger stalling. As someone below explains, this happens because the engine is stopped so suddenly, causing a sudden decrease in the ammount of air needed for combustion. The air instead builds up in pressure, and then fires back through the turbo as seen here. This is NOT good for the turbo AT ALL! A marine diesel engine is typically only guaranteed to last for two crash-stop tests like this one, and one is carried out during the sea trials when the ship is launched.
well, why don't they make a spring load valve? err i don't know the right word for it... like a "safety valve" wich is opened above specific pressures... or would such a valve just be to small/ slow for this application? on the other hand... how many of these sudden stops are they likely to make? it'll be a very rare one, right? (except for the sea trail...)
incorrect, he's talking about a BOV Blow off valve, you run them on turbo-charged cars to release the excess pressure (we run one on my drag car) it releases pressure and makes a ppppsssshhhhhhh sound it's so the compressor doesn't surge back and forth and twist the turbines, or worse snap the shaft, but on something this big with this much boost, the BOV would be unbearable to hear...
Yeah you'll find that on a tuned streetcar, but on industrial engines they don't, no don't, use that kind of valves...It's not about a sporty sound there...
Exactly :) A spring loaded safety valve would have to be enourmous to function properly. It is simply not possible. The BOV valve would be a nice idea, but again I hardly think it is possible.
It does not matter. It's the same thing. I only called it that because if I had said Charge Air Pressure, I would have probably had to explain what that meant... However, thank you for your response...
In the video, it appears the engine is under full load, and the turbo is at full boost. When the engine is throttled down abruptly, the excess boost has no where to go but back out the intake causing a loud chuffing sound, and partially stalling the compressor turbine. This excess boost blow off is hard on turbo chargers.
If the engine is slowed down rapidly enough, that would be true. But lacking any intake air restriction (like a throttle plate or body), which is typical of all diesels, and the sheer size of this one... I'd say it's rather unlikely. The compressed air from the turbocharger will always have a direct path to each cylinder.
But I don't know these big marine diesels at all, so unless someone who does posts, all I can do is speculate.
I don't know a lot about these huge diesels; what is the purpose of the "blow-off"? Looked like a sort of backfire w/ the smoke emerging from the intake...
It'[s ok, they pay them 40Cents a day shipped in from an other country. ear protection isn't needed
bababooey7576 5 months ago
this ain't in a ship, its chuck norris' wrist watch.
radeakins 5 months ago
At the sound of the alarm you wil loose your hearing.
Smithyards 6 months ago
Where are the cows?
JasonJason210 7 months ago
shut down! ! !
vitaliwths 8 months ago
I wish my subaru blow off like this haha
thestiguy 9 months ago
sense of hearing is nto treasured there i guess
blacksheep903 10 months ago
Comment removed
amonnaheadbutcha 10 months ago
wat the hell
caprine888 10 months ago
Damn i hate that blower sound...
SthealthRaider 11 months ago
nice engine sound
donrics7 1 year ago
its just the excess boost presure
ryan000s 1 year ago
bad ass i love it. cool stuff guys. keep up the good work.
stevodieseltech 1 year ago
that good in a few month time he won't hear his wife neging at him
ahchuan2000 1 year ago
yes...its damn loud in there...but i just like them...i didn't used ear plug..or ear muff...
0136489913 1 year ago
The gloves are there to protect the engine
TheTarzan58 1 year ago
@TheTarzan58 Εγινε και ο Tarzan Επιστήμονας!
faltsetas88 11 months ago
Never mind the Pringles can.... look at it! Its almost blowing the filters off!
Hanglands 1 year ago
Comment removed
777jeri 1 year ago
The ship is German-owned, it was built in China, the engine was built in Japan, and it flies the Liberian flag.
douro20 1 year ago
did it backfire thru the turbo?
rongenman 1 year ago
I just hope he was actually born deaf - that's insanely loud
jfjenofhrenon 1 year ago
turbocharger surging.....nice....
limsoontiongod 1 year ago
my ears hurt for this guy
canadaguy2112ca 1 year ago
I toured a huge container ship and had a Japanese Coca Cola lol giant engines in that thing
MrROTD 1 year ago
It seems that many want to know why it crashes in the turbo. This phenomenon occurs when you release the throttle too fast on a big engine. If the turbo from the start has a high speed, it takes a long time for it to rev down, and when there is no longer as much air intake to the engine, it becomes a high pressure in the inlet manifold. This air has nowhere to go except back through the turbo and air filter. This is going very fast, and therefore, there is a bang as we see in the video.
91ljual1 1 year ago 2
@91ljual1 Sounds a lot like compressor stall on a turbojet engine, just less external flame.
zaphodb777 1 year ago
@91ljual1 Thanks man.
amonnaheadbutcha 10 months ago
As a former ship's captain I can assure you that in the old motor ships of the nineteen forties and fifties-I mean ships that were already twenty to thirty yearws old the noise in the engine room was deafening.Air full of fumes;blast injection was the worst;the noise was incredible but our engineers went through this,year after year with no apparent ill effects.
Squarerig 1 year ago
@Squarerig WHAAAAAT?
Paraffinmeister 1 year ago
And just how can you tell he is not wearing earplugs
916fanatic1 2 years ago
looks like fun, but its really a cunt of a job
fetufab 2 years ago
so wat made u say that ? you've worked in a ship ??? well i have and its true,, i wud rather get fucked than working in there
vanmaarwijk 2 years ago
I have worked at sea since 1993 and I have my chiefs tickets as well as degree in thermodynamics, so In answer to your question yes I have worked on a ship and it really is a cunt of a job. :-)
fetufab 2 years ago 5
Please explain why.
Goofus5453 2 years ago
@fetufab LOL - yea I agree with your description of the job... I vowed never to pick up a spanner ever again..hahaha...the deal breaker was my last trip when I was stood in the crankcase taking an oil bath with lube running over my face and specs...down my boiler suit and into my pants. Great.
RezStudio 1 year ago
This has been flagged as spam show
@RezStudio
I'm sorry, but you are stupid. Entering in crankcase, without first manually switch off LO pumps... You are lucky that you are alive.
777jeri 1 year ago
This has been flagged as spam show
I'm sorry, but you are stupid. Entering in crankcase, without first manually switch off LO pumps... You are lucky that you are alive.
777jeri 1 year ago
dfghrfth
newhollandjd 2 years ago
no earplugs or muffs-what an idiot.
that is a cool clip of a Mitsubishi turbocharger "surging". That is a condition that happens during sudden unloading/decelleration of the engine. A crash stop is almost never performed unless for regulatory testing. A ship will never slow down the engine that fast under normal conditions.
josemama 2 years ago 5
he must be deaf by now
foxdmulder 2 years ago 3
Im Marine engine mechanics train to operate, inspect, test and perform corrective and preventative maintenance on marine equipment, can anybody help me get onboard.
nautik999 2 years ago
this is one of the worst jobs u can ever do, huge mistake
source : personal experience
vanmaarwijk 2 years ago 2
yeah I can smile but I can't f**kin hear ya , WHAT'D ya SAY !!
gunnz23 2 years ago 3
Go to specialist college. 3yrs gets you qualified on the bottom rung of the ladder. Then work your way up with sea-time and experience.
mikeng68 2 years ago
ONLY for experienced MARITIME and OFFSHORE workers
Join Offshoreworkmates com
Online hub for brothers of the SEA
rustybek 2 years ago
No hearing protection, but they got latex gloves!
65Dart 2 years ago 28
@65Dart what? huh?
sbeer6er 1 year ago
i want to be a ship mechanic and i heard u must do an apprenticeship for 3 years to get a ship mechanic then u can do an exam for 5 years to get first officer on the bridge or leader of the machine room and u must do another exam forthe captain
indahooddererste 2 years ago
i am student of maritime uniwersity and i whink will be better if you go studying if you want to get on board as mechanic. unless you go to school you will must work as motorman vory long time.. and i dont think that you will get on higher rank on board. the most important is certificate experience you will get on board. regards from poland
Gpoint177 2 years ago
Depends on the country. in the UK it's a little over a 3 year course that does time at uni covering all the maths and mechanics and at sea to do the practical stuff. This is followed by a final oral exam for 4th officers ticket.
You then have to have more sea time and pass further orals and written exams to gain rank to 3rd, 2nd& chief officer. u cannot become captain as an engineer!
If u join be sure to work on plenty of maths as you will need to be about A-level standard to get through!
Triskell00 2 years ago
yes its the situation in germany there u can get captain under 8 years seems to be very fast
indahooddererste 2 years ago
They got Sulu in the engine room.
supressorgrid 2 years ago 2
ahh, barking blowers :D
leenmanta 2 years ago
Where is his hearing protection?
He'll be deaf bytime he gets back to shore.
spike555 2 years ago 4
Turbocharger surging was caused by fast load drop. Excessive air that was kept in the air receiver was blown through the turbocharger compressor. This happens because of long reaction delay between exhaust gas system and scanvenging air system.
mazioleq 2 years ago 2
maz, give me a steam turbine, anyday. =Stefan=
chengloki 2 years ago
The turbo charger is dirty probably thats why it sound like that way. It 's happened to me severeal times when I was third eng. in one bulk carrier
dominouvera 2 years ago
so if the air purifier in the room shuts off... they have to leave? carbon monoxide ?
Infamanious 2 years ago
thats just a little pussy of an engine
246DEK74 2 years ago
The Engine room controls everything on a Ship. Everything. One cannot even shit legally at sea without engineering. All anti pollution and environment protection equipment is engineering based and in the E/R. Loading is Engineering. Discharging Cargo is Engineering. Moving ships is Engineering. Steering ships is Engineering. Making water or Power is on board is Engineering. Ship Captains know nothing on these. They don't even navigate as pilots are assigned each port. Grade 3 level job: Captain
nexprotein28 2 years ago
That's why C/Es are always getting thrown in jail for forging the oil record book. 'Cause they're so fucking smart and in charge...
CaptZdrive 2 years ago
thats right,a ship whit out engineer it's only a piece of steal that float....olso a child can use a modern system on the bridge...ma no one can repair it if is not a engineer whit two big BOX!!!!i did not start to talck about E.R.because only small people can understand what i'm talcking about...and i think you are one of them....
Engineer are the blood,the heart,and the head of th ship....the bridge is only the eyes.....
trriver53 2 years ago
yes but without eyes you r running blind..i know how important chief engineers r but again without eyes your fumbling for the light switch
iwannabeit 2 years ago
So tell me what skill set is really required to steer ships from point A to point B? A grade 3 child can do that. You really don' need much of an education or high skill level to do that. The operational shipping industry is retarded because of the present command based set up on board. Industries on shore discarded this type of management set up last century.
nexprotein28 2 years ago
I'm a engineer on ship. Wheelsman steer the ship and are usally a GP ( general purpose watch keeper). And yes theres hardly any education for such position. However to be classed as an officer, either deck or engine room, you need a university degree in some countries or 3.5 yr advanced college degree.
so unless you can do thermodynamics, physics, chem, calculus and countless other courses i wouldn't be saying to much.
jr20012 2 years ago
Deck people as per STCW don't require a degree. They start on deck chipping, painting, learnin to plot a position on a chart (you can learn that in less than 10 minutes). Greasing on deck is an important job. Also cleaning hatches. Ask any Captain to trouble shoot a problem on board. His natral instinct will be head to the telephone and ring up C/E or ECR. Fact.
nexprotein28 2 years ago 2
In order to steer a ship yes, you dont need special skills. BUT in order to learn HOW to steer a ship and be able to explain and most importantly to understant the reactions of the ship is a total different story. Excuse me but, you are totally wrong. Nick, Naval Architect and Marine Engineer, NTUA.
NikosSTD 2 years ago
you are so wrong mate you cant even imagine how ....
a6km 2 years ago
They have pringles in china!
flyrock45 3 years ago
ZOO !?
OneMilePerKeg 2 years ago
seriously guys, ear protection...?
baileys60 3 years ago 27
WHAT !?
mathiastheok 3 years ago 4
HOT !?
OneMilePerKeg 2 years ago
WHO !?
mathiastheok 2 years ago
lol =)
justheretosee 2 years ago
@baileys60 They Cant Hear You,lol
spinaway 1 year ago
@baileys60 WHAT? WHAT? I CAN'T HEAR YOU!
luccfilho 8 months ago 2
@luccfilho lol
baileys60 8 months ago
This has been flagged as spam show
just moved new area
someone want to chat DL
856891 3 years ago
sea trial sux!!!
rezlusrta 3 years ago
as the engine slows down there is a pressure build up that exhausts back past the compressor turbine releasing the stored energy. the noise can be heard outside the engine room. this only happens when the fuel has been shut off either by the governor or control
acevr4 3 years ago 4
what maid the turbo back fire???
singful 3 years ago
nice turbocharger surging
jibem76 3 years ago
whats happen ?
justheretosee 3 years ago
turbochargers new generation hase the wastgate valve,and by-pass valve on air side of turbocharger.
paoloyes 3 years ago
This is a ship, not a car. Ships don't have BOVs.. Jeez.
joffeloff 3 years ago 2
are u shure? ahha poor guy
paoloyes 3 years ago
HAha, belching out some Pringles
mpwelk 3 years ago
I did sea trials with Diamond offshore's Ocean Clipper. Good stuff.
ValiRossi 3 years ago
no ear defenders, poor engineer. I can garentee he's deaf no, no health and safety = devils work
barixkhan 3 years ago 4
that`s a nice size turbo. should put that in skyline, now that would be something.... lol
roadrunnerhm 3 years ago
This has been flagged as spam show
Hey catch me in naked on my personal webpage meetyourfling(.Com)
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danmckinney 3 years ago
Pringle! Sour Cream with Onion favor!
Danny19921125 3 years ago
if you eat to many pringles the same thing will happen to your ass!
clamcrabber 3 years ago 2
I wonder if the company is very happy forthat guy not using ear protection! HSE is important.
nordrott 3 years ago
Tets trail= wharf crew
MdMx20060 3 years ago
This huge sound was turbocharger "surge"
Surge can raise the pressure of the air to a level which can be destructive to the engine. It happened because of the sudden decrease of engine's RPM during crash stop test.
japanesexxx 3 years ago
is the large grey cylinder the air intake? if so why is not a duct going topside? it would seem that if you were to accidently isolate the engine room somehow, that you would pull a mighty vacuum and probably die... just curious:)
usbiker133t 3 years ago
The large "grey cylinder" is actually the compressor housing and air filter of an extremely large turbo. Engine rooms such as this are normaly well vented.
novakane87 3 years ago
i know theyre well vented but still, the diesel spaces on my ship are actually air tight and the intakes take a suction topside.
usbiker133t 3 years ago
Actually it's not a filter, but a silencer...it does not filter the air, it has a real open structure...It only makes the noise somewhat bearable...;)
weedeatertijs 3 years ago
my engine room is very well ventilated. One of the doors to the purifier room actually bows due to the huge pressure difference across it. it actually broke open one day, and nearly killed a cadet standing behind it. So let that be a lesson to you all!!
TheChiefEngineer 2 years ago
the duct going topside is the exhaust form the turbine
blacknoise1982 3 years ago
pringles can??!! what is dat thing...Mr. Fusion?!
blwalla 3 years ago
Mr. Fusion, SWEET!! Quick Marty, throw some Miller High Life down that thing!
slow5oh89 3 years ago
RUN FOR IT MARTY !!!
blwalla 3 years ago
don't crash-stops hurt the engine?
thermoid 4 years ago
crash stop test is A NIGHTMARE for the engine.
usually through a vessel's life it happens once; only in sea trials
japanesexxx 3 years ago
Excuse my ignorance but what is a crash stop? Is it like jamming a stick into a bicycles spokes?
brettv8 3 years ago
A crash stop is a maneuvre which in short means to stop the ship as quickly as possible, this means that the ship's engine has to be reversed.
nordrott 3 years ago
Well, the powertrain HAS to be able to withstand it. If it doesn't, the engine has to be rebuilt and the whole sea trial restarted.
douro20 2 years ago
That guy is going to be 'deaf as a post' by the time he's 40....if he isn't already. I did the same thing and now I am.
JGMagoo 4 years ago
hope they have ear protection
carpetbarther 4 years ago
that guy better make good cash for what he does
BrokenFable 4 years ago
02:17 whot is that?
solveg18 4 years ago
That's the air filter with the turbo behind it
randknu 4 years ago
That was whot i thought, just ask to be sure, But hey That Turbo is almost as large as my car if not more. hahaha:D Love it nice vid!
solveg18 4 years ago
corfuL V fuck you man! i have been with filipinos they are the best seafarer.
juvee7412 4 years ago 2
omg like english lol jk yeah lots a complicated stuffs i can get enough trouble wit ha 25horse inboard lol
JRC808 4 years ago
Bark! 9/10 times the turbo is going to surge during a full ahead-to-crash astern. yes, it strains the rotor, and something could catastrophically fail, but these engines are designed to "limp" at reduced operating speed w/o a turbo. Had I a choice of disabling the turbo vs. pulling a piston with broken rings or worst a skirt (at sea), ill take the former. I once had to "hang up" a con-rod due to a failed crankpin bearing, thankfully in calm seas.
DocPhotop 4 years ago 2
i beleave they do where ear protection but than in the form of props inside there ears.
and not the things (dont know the word) you put over youre head, because they wouldent hold. the sound of the video is just a thenth of the true sound this engine makes.
Splinter5570 4 years ago
damn filipino ratings, rrrrrrrrrrrr
corfuLV 4 years ago
The castings on these turbochargers are made to keep all debris inside, in case of explosion. However, it's never fully save to stand close to a turbocharger in operation, especially when the throttle is brought back to zero in an instance...then the turbo is still pumping air, but the pressure can't escape, so it boosts back trough the filter/silencer.That's why the pringles-can is thrown back.
weedeatertijs 4 years ago 2
C/E must have lost his senses , if the turbochrger rotor is damaged
mailnitinrai 4 years ago
this is a radially flowing exhaust gas to the turbo right?
barixkhan 4 years ago
It's incredible the amount of abuse these things have to go through to win the approval of RINA/DNV.
douro20 4 years ago
Didn't mention that this engine would have one, actually not many larger engines have one, but responded to 'Bartjoohs' question about a spring-loaded valve wich regulates turbocharger-boost...
weedeatertijs 4 years ago
Ive worked on an engine same as this probably same model 7 cylinder B&W 800mm bore prolly about 32000 horse, looks like a peak pressure test he is doing under full load and they have brought the throttle back to zero, this engine does not have a wastegate!
MrBerrie1 4 years ago
Where was this ship built?
douro20 4 years ago
Besides, a waste-gate does not blow off, it just provides a short-cut for the exhaust gasses by letting them pass without flowing trough the turbine-side of the turbo so they won't power the turbine any longer...And less flow trough the turbine-side will cause less pressure on the compressor-side...
weedeatertijs 4 years ago
A wastegate isnt just there to produce sound, its there to prevent overboosting which leads to catastrophic engine failure caused by detonation due to the motor being fed too much air, its opened by a pressure driven actuator on the exhaust side which opnes a poppet valve in the turbine housing or on the manifold itself which vents off excess gas preventing the turbo from spooling any faster.
ScotchRB30DET 4 years ago
Yeah, but that was allready explained by bartjooh and me...(;
weedeatertijs 4 years ago
Since diesel engines work by detonation, I'm not sure what you mean here. Are you translating your spark ignition petrol engine experience to this beast?
Tonyv1951 4 years ago
Well, in my opinion a diesel engine does not work by detonation. It is self-igniting due to high pressure and temperature, but detonation is something you don't want to happen in your engine...It wrecks everything...
weedeatertijs 4 years ago 3
yep. compression ignition.
wharbio 4 years ago
Well it's kinda hard for me to explain it in english, but what I mean is that the intake air at a certain pressure opens the springloaded wastegate wich allows exhaust air, wich normally spoken powers the turbine, to pass the turbine without powering it.
I'm sorry for my confusing reply people...
weedeatertijs 4 years ago
Iunderstand what you mean. that's my sugestion here. indeed not for the 'sporty' sound. But for the technics: ensuring the safety of the engineparts. perhaps such a valve would just be to expensive to install? considering that such a emergency stop is very very rare occasion.
what language do you speak weedeatertijs? NL, that's my 1st. language...
bartjooh 4 years ago
you're right, my main language is dutch indeed...
weedeatertijs 4 years ago
mmm...I meant a waste-gate...
But when intake pressure gets too high, it opens (it's spring-loaded) and allows an amount of intake-air to pass the turbo without powering the turbine, the intake-air then flows directly to the exhaust system so it doesn't push the boost further up.
weedeatertijs 4 years ago
Is that what they mean about the pringles; once you POP!! you can't stop?? :-)
weedeatertijs 4 years ago
wow turbo shoting this is a normal hehehe
fireeexz 4 years ago
ok now thats the air filter cleaned,time for a cup of tea :-)
mightyfinejonboy 4 years ago
This is a case of turbo charger stalling. As someone below explains, this happens because the engine is stopped so suddenly, causing a sudden decrease in the ammount of air needed for combustion. The air instead builds up in pressure, and then fires back through the turbo as seen here. This is NOT good for the turbo AT ALL! A marine diesel engine is typically only guaranteed to last for two crash-stop tests like this one, and one is carried out during the sea trials when the ship is launched.
Ebbeboy 4 years ago
well, why don't they make a spring load valve? err i don't know the right word for it... like a "safety valve" wich is opened above specific pressures... or would such a valve just be to small/ slow for this application? on the other hand... how many of these sudden stops are they likely to make? it'll be a very rare one, right? (except for the sea trail...)
bartjooh 4 years ago
I think you are talking about a waiste-gate...
weedeatertijs 4 years ago
incorrect, he's talking about a BOV Blow off valve, you run them on turbo-charged cars to release the excess pressure (we run one on my drag car) it releases pressure and makes a ppppsssshhhhhhh sound it's so the compressor doesn't surge back and forth and twist the turbines, or worse snap the shaft, but on something this big with this much boost, the BOV would be unbearable to hear...
TurboTegLS 4 years ago
Yeah you'll find that on a tuned streetcar, but on industrial engines they don't, no don't, use that kind of valves...It's not about a sporty sound there...
weedeatertijs 4 years ago
Exactly :) A spring loaded safety valve would have to be enourmous to function properly. It is simply not possible. The BOV valve would be a nice idea, but again I hardly think it is possible.
Ebbeboy 4 years ago
the boost pressure is only something like 0.98 bar. There is alot of air though by volume.
TheChiefEngineer 2 years ago
try Charge Air Pressure Chiefy
swazcotaz 2 years ago
It does not matter. It's the same thing. I only called it that because if I had said Charge Air Pressure, I would have probably had to explain what that meant... However, thank you for your response...
TheChiefEngineer 2 years ago
No hearing protection...... He'll be deaf soon
varminblast 4 years ago
It´s surging because have a unbalance in a cilinder
poncesv 4 years ago
they do it deliberately, because its a crash stop test.
TheChiefEngineer 2 years ago
In the video, it appears the engine is under full load, and the turbo is at full boost. When the engine is throttled down abruptly, the excess boost has no where to go but back out the intake causing a loud chuffing sound, and partially stalling the compressor turbine. This excess boost blow off is hard on turbo chargers.
nrgajewski 4 years ago 5
Thanks; that's a clear explanation of this...seems like this occurs in lieu of a "wastegate" on smaller turbocharged engines.
sortashaman 4 years ago
If the engine is slowed down rapidly enough, that would be true. But lacking any intake air restriction (like a throttle plate or body), which is typical of all diesels, and the sheer size of this one... I'd say it's rather unlikely. The compressed air from the turbocharger will always have a direct path to each cylinder.
But I don't know these big marine diesels at all, so unless someone who does posts, all I can do is speculate.
Alisterwolf66 4 years ago
These are 2 stroke diesels.
motonegros 2 years ago
Turbo surging/stalling?
apeppink 4 years ago
I don't know a lot about these huge diesels; what is the purpose of the "blow-off"? Looked like a sort of backfire w/ the smoke emerging from the intake...
sortashaman 4 years ago
tut tut. No ear defenders
steviejlyons 4 years ago
if i am not mestaking that is the biggest blow off valve i have ever seen.
mhallday1 4 years ago
thats not a blow off valve. that was a compressor surging.
TheChiefEngineer 2 years ago