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From: Tzortzakakis Dimitrios on 11 Mar 2010 11:28

? "Savageduck" <savageduck1@{REMOVESPAM}me.com> ?????? ??? ??????
news:201003100936127987-savageduck1(a)REMOVESPAMmecom...
> On 2010-03-10 08:21:23 -0800, "Tzortzakakis Dimitrios" <noone(a)nospam.com>
> said:
>
>>
>> ? "Irwell" <hook(a)yahoo.com> ?????? ??? ??????
>> news:78hz8123c0m0$.1rqijtn75gku4$.dlg(a)40tude.net...
>>> On Tue, 9 Mar 2010 18:52:12 +0200, Tzortzakakis Dimitrios wrote:
>>>
>>>> Of a large two-stroke diesel (similar to the ones that move ships, but
>>>> here
>>>> used for generating electricity).
>>>> These engines are base-load, here in Crete, that means they run 24/7,
>>>> on
>>>> mazut (heavy fuel), and they need 11 tons of mazut an hour, 15,000 HP
>>>> or
>>>> 11
>>>> MW. After 6 months of continuous running, they shut them off, and
>>>> replace
>>>> worn out parts, pistons, valves, cylinder liners etc. I don't know when
>>>> they
>>>> replace the crankshaft. This engine runs at 120 rpm, btw. The piston is
>>>> as
>>>> large as a small table. I will take more photos of even larger, 70,000
>>>> HP
>>>> diesels (50 MW) and large steam turbines with the same power, including
>>>> the
>>>> boiler, when I visit in September the new power plant, in
>>>> Atherinolakkos.
>>>> (There is a call for papers then, and my ex-professor invited me). This
>>>> photo is taken BTW. with my old Kodak CX 7300.
>>>> http://www.flickr.com/photos/44148682(a)N02/4420346944/?rotated=1&cb=1268152461125
>
> Interesting
>>>>
>>> shot, I wonder what sort of noise that engine makes?
>> The noise and the vibrations are unbelievable. Imagine one million
>> walnuts
>> being crushed at once. These engines BTW are fired up with compressed
>> air,
>> no starter motor at these HP ranges. When on a modern ship, like Knossos
>> Palace (Piraeus-athens to Iraklion), which has 4 Wartsila
>> (www.wartsila.com)
>> 12V46 C 4-stroke engines (12:number of cylinders In V 46 cm piston bore C
>> compression ratio) you can easily tell when they fire up the engines, by
>> the
>> vibrations, or when it's in reverse, or even when they fire up all 4,
>> when
>> they want to cruise at full speed.
>
> Yup those are huge, but they are dwarfed by the monster Wartsila
> RT-flex96C;
> <
> >http://www.wartsila.com/Wartsila/global/docs/en/ship_power/media_publications/technical_papers/sulzer/rtflex96c_containership.pdf
> >Yup, the largest machine is a nuclear power plant's steam turbine, at
> >2,500,000 HP, on one shaft. I have a photo from a german brochure, I can
> >post it. The machine you mention is the largest ICE engine (Internal
> >Combustion Engine). The generators these monsters drive are not less
> >impressive.
>>
>
> The scale of some of the marine diesels has to be seen in person to be
> believed.
>
> Some years ago, through work, I became acquainted with a ship's agent in
> the SF Bay area. He had to have parts for an engine repair shipped to his
> yard, to await the arrival of the freighter they were needed for.
> These parts included a piston, cylinder sleeve and a valve. The sleeve was
> some 18 ft high and weighed several tons. The valve looked just like a
> normal automotive valve, with the exception that it stood about 8 foot
> tall, and weighed in at about 2500 lbs.
>
> I was able to go aboard the ship when it arrived, and I was amazed by the
> engine room. it would have put a surgical cleanroom to shame. The
> offending cylinder had been disconnected from the drive shaft to allow the
> ship to proceed for repairs. The access to the cylinder was through door
> sized hatches. I am still amazed by the scale of that engine (a B&W MAN
> marine diesel, it was considered average size!) I wish I had my camera
> with me for that opportunity.
I was in a ship that normally travelled between Albania and Italy, but the
socialist party of greece hired to commute voters between Piraus and
Iraklion. So, I woke up at 6 o'clock, and found out, that instead at Piraus,
we were floating adrift an island (Milus), obviously with the engines off.
When the rest of the passengers awoke, first we invaded the bridge, where
the captain had some garlic (lol) and then the engine room, where it was
proven that a pipe that supplied both engines with sea water had ruptured,
leading to an emergency shut-down of the engines. They tried to repair the
hole by pouring some concrete (!) and then by welding a new piece of pipe.
And then they started the sea water pump, and they told us to clear off the
engine, and a siren wailed, and a sailor told me "it's gonna start", and the
engine started, sounding much like Cheety-cheety bang bang in larger
proportions. And then, she could sail into the port of Milus. The engine had
valves that looked much like clarinet valves. Of course, I had no mood to
take photos, and then they made a mass lawsuit against everyone they could
think of (the passengers).



--
Tzortzakakis Dimitrios
major in electrical engineering
mechanized infantry reservist
hordad AT otenet DOT gr



From: Tzortzakakis Dimitrios on 11 Mar 2010 11:31

? "Vance" <vance.lear(a)gmail.com> ?????? ??? ??????
news:d6c07fef-aeca-498a-92d7-ae7d9e5c74df(a)k6g2000prg.googlegroups.com...
On Mar 10, 9:36 am, Savageduck <savageduck1@{REMOVESPAM}me.com> wrote:
> On 2010-03-10 08:21:23 -0800, "Tzortzakakis Dimitrios" <no...(a)nospam.com>
> said:
>
>
>
>
>
>
>
> > ? "Irwell" <h...(a)yahoo.com> ?????? ??? ??????
> >news:78hz8123c0m0$.1rqijtn75gku4$.dlg(a)40tude.net...
> >> On Tue, 9 Mar 2010 18:52:12 +0200, Tzortzakakis Dimitrios wrote:
>
> >>> Of a large two-stroke diesel (similar to the ones that move ships, but
> >>> here
> >>> used for generating electricity).
> >>> These engines are base-load, here in Crete, that means they run 24/7,
> >>> on
> >>> mazut (heavy fuel), and they need 11 tons of mazut an hour, 15,000 HP
> >>> or
> >>> 11
> >>> MW. After 6 months of continuous running, they shut them off, and
> >>> replace
> >>> worn out parts, pistons, valves, cylinder liners etc. I don't know
> >>> when
> >>> they
> >>> replace the crankshaft. This engine runs at 120 rpm, btw. The piston
> >>> is
> >>> as
> >>> large as a small table. I will take more photos of even larger, 70,000
> >>> HP
> >>> diesels (50 MW) and large steam turbines with the same power,
> >>> including
> >>> the
> >>> boiler, when I visit in September the new power plant, in
> >>> Atherinolakkos.
> >>> (There is a call for papers then, and my ex-professor invited me).
> >>> This
> >>> photo is taken BTW. with my old Kodak CX 7300.
> >>>http://www.flickr.com/photos/44148682(a)N02/4420346944/?rotated=1&cb=12...
>
> Interesting
>
>
>
> >> shot, I wonder what sort of noise that engine makes?
> > The noise and the vibrations are unbelievable. Imagine one million
> > walnuts
> > being crushed at once. These engines BTW are fired up with compressed
> > air,
> > no starter motor at these HP ranges. When on a modern ship, like Knossos
> > Palace (Piraeus-athens to Iraklion), which has 4 Wartsila
> > (www.wartsila.com)
> > 12V46 C 4-stroke engines (12:number of cylinders In V 46 cm piston bore
> > C
> > compression ratio) you can easily tell when they fire up the engines, by
> > the
> > vibrations, or when it's in reverse, or even when they fire up all 4,
> > when
> > they want to cruise at full speed.
>
> Yup those are huge, but they are dwarfed by the monster Wartsila
> RT-flex96C;
> <http://www.wartsila.com/Wartsila/global/docs/en/ship_power/media_publ...
>
>
>
> The scale of some of the marine diesels has to be seen in person to be
> believed.
>
> Some years ago, through work, I became acquainted with a ship's agent
> in the SF Bay area. He had to have parts for an engine repair shipped
> to his yard, to await the arrival of the freighter they were needed for.
> These parts included a piston, cylinder sleeve and a valve. The sleeve
> was some 18 ft high and weighed several tons. The valve looked just
> like a normal automotive valve, with the exception that it stood about
> 8 foot tall, and weighed in at about 2500 lbs.
>
> I was able to go aboard the ship when it arrived, and I was amazed by
> the engine room. it would have put a surgical cleanroom to shame. The
> offending cylinder had been disconnected from the drive shaft to allow
> the ship to proceed for repairs. The access to the cylinder was through
> door sized hatches. I am still amazed by the scale of that engine (a
> B&W MAN marine diesel, it was considered average size!) I wish I had my
> camera with me for that opportunity.
>
> --
> Regards,
>
> Savageduck- Hide quoted text -
>
> - Show quoted text -

My fist degree was Marine Engineering and all these powerplants were
just specs until I saw one being installed at the Bath shipyards in
Maine. All those numbers became very solid reality when faced with a
2 story hunk of metal.

Admittedly, this powerplant is over the top, but the smaller ones are
awfully damned impressive themselves. This video shows the inspection
hatches and gives the figures for bore, stroke, etc.

http://www.youtube.com/watch?v=jXHvY-zY9hA&feature=related

<end quote>
Impressive, our new power plant has two mitsui engines, 70,000 HP,
two-stroke, and two steam turbines of the same power. As long as I can visit
it,I will take photos and short videos.


--
Tzortzakakis Dimitrios
major in electrical engineering
mechanized infantry reservist
hordad AT otenet DOT gr


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