Australian Politics Forum
http://www.ozpolitic.com/forum/YaBB.pl
General Discussion >> Technically Speaking >> Ship engines
http://www.ozpolitic.com/forum/YaBB.pl?num=1602332781

Message started by Sprintcyclist on Oct 10th, 2020 at 10:26pm

Title: Ship engines
Post by Sprintcyclist on Oct 10th, 2020 at 10:26pm


https://www.youtube.com/watch?v=J-D9Ka3TM1I

From what I can gather, they start the 250 HP diesel generator first.
That provides the power to start this ship engine ........

Title: Re: Ship engines
Post by Jovial Monk on Oct 11th, 2020 at 11:43am
Very interesting. Thanks for posting that Sprint.

Title: Re: Ship engines
Post by Captain Nemo on Oct 11th, 2020 at 12:31pm
LOL

Alarm goes off ...

Solution?

Shut off the alarm.  :D

Title: Re: Ship engines
Post by Jovial Monk on Oct 11th, 2020 at 1:00pm
Compressed air nearly out but both engines started so didn’t matter.

No starter motor for such huge engines—compressed air turns them.

(From reading the comments below the video.)

Title: Re: Ship engines
Post by Baronvonrort on Oct 11th, 2020 at 1:39pm

Sprintcyclist wrote on Oct 10th, 2020 at 10:26pm:
https://www.youtube.com/watch?v=J-D9Ka3TM1I

From what I can gather, they start the 250 HP diesel generator first.
That provides the power to start this ship engine ........


Wait until you see how they get reverse with ships.  :o

Stop the engine then run it backwards.

Title: Re: Ship engines
Post by Sprintcyclist on Oct 11th, 2020 at 1:42pm

Jovial Monk wrote on Oct 11th, 2020 at 1:00pm:
Compressed air nearly out but both engines started so didn’t matter.

No starter motor for such huge engines—compressed air turns them.

(From reading the comments below the video.)


Ah, ok

Title: Re: Ship engines
Post by Sprintcyclist on Oct 11th, 2020 at 1:43pm

Baronvonrort wrote on Oct 11th, 2020 at 1:39pm:

Sprintcyclist wrote on Oct 10th, 2020 at 10:26pm:
https://www.youtube.com/watch?v=J-D9Ka3TM1I

From what I can gather, they start the 250 HP diesel generator first.
That provides the power to start this ship engine ........


Wait until you see how they get reverse with ships.  :o

Stop the engine then run it backwards.


Really ?

Title: Re: Ship engines
Post by Baronvonrort on Oct 11th, 2020 at 1:46pm

Sprintcyclist wrote on Oct 11th, 2020 at 1:43pm:

Baronvonrort wrote on Oct 11th, 2020 at 1:39pm:

Sprintcyclist wrote on Oct 10th, 2020 at 10:26pm:
https://www.youtube.com/watch?v=J-D9Ka3TM1I

From what I can gather, they start the 250 HP diesel generator first.
That provides the power to start this ship engine ........


Wait until you see how they get reverse with ships.  :o

Stop the engine then run it backwards.


Really ?


Yes.


Title: Re: Ship engines
Post by Dnarever on Oct 11th, 2020 at 1:58pm

Jovial Monk wrote on Oct 11th, 2020 at 1:00pm:
Compressed air nearly out but both engines started so didn’t matter.

No starter motor for such huge engines—compressed air turns them.

(From reading the comments below the video.)


Yes worked in a situation where we had an old UK submarine engine to run backup power.

had an air compressor that dribble loaded enough to get 2 chances at kicking over the engine.

Step one was to undue the solid headers.

Step 2 was to use a 6 foot bar to align the fly wheel to TDC.

Step 3 was turn off the waterflow for cooling.

Step 4 was to manually pump lubricant into something I forgot what.

Step 5 was to kick the engine. Hope it starts if not give it a minute check everything and try again. It always started the 2nd time if you knew what you were doing.

Step 6 was to let it run up to speed.

Step 7 was to adjust the little acceleration wheel to the speed required to line up the 3 phase power output.

Step 8 was run around about half the building to shut down the commercial power

Step 9 was to run back and switch the backup power into circuit.

step 10 was to wait about 15 minutes and when the engine came up to temperature turn on the water cooling system again.

Step 11 was to place buckets to catch leaking fuel.

Step 12 routinely check for phase stability.


Title: Re: Ship engines
Post by Sprintcyclist on Oct 11th, 2020 at 2:12pm

I can't imagine 1/2 the stuff said here.


I entirely accept what you all say, I just have no experience in this area.

Title: Re: Ship engines
Post by Sprintcyclist on Oct 11th, 2020 at 3:52pm

Baronvonrort wrote on Oct 11th, 2020 at 1:46pm:

Sprintcyclist wrote on Oct 11th, 2020 at 1:43pm:

Baronvonrort wrote on Oct 11th, 2020 at 1:39pm:

Sprintcyclist wrote on Oct 10th, 2020 at 10:26pm:
https://www.youtube.com/watch?v=J-D9Ka3TM1I

From what I can gather, they start the 250 HP diesel generator first.
That provides the power to start this ship engine ........


Wait until you see how they get reverse with ships.  :o

Stop the engine then run it backwards.


Really ?


Yes.



https://www.youtube.com/watch?v=3CzabMnTOzA

right, thanks

Title: Re: Ship engines
Post by Jovial Monk on Oct 11th, 2020 at 6:50pm
The ships telegraph on the bridge has a small pointer: when the engine room receives the signal for more speed or whatever they would move their telegraph to that position, moving the small pointer on the bridge telegraph—the bridge then knew the engine room had received the signal and was acting on it.

Here is a ships telegraph with the small pointer pointing to 2.00pm


ships_telegraph.jpg (125 KB | 29 )

Title: Re: Ship engines
Post by Belgarion on Oct 11th, 2020 at 7:30pm
The above picture shows the telegraph repeater indicating full astern.

Title: Re: Ship engines
Post by John Smith on Oct 11th, 2020 at 7:45pm

Captain Nemo wrote on Oct 11th, 2020 at 12:31pm:
LOL

Alarm goes off ...

Solution?

Shut off the alarm.  :D


Back before I started my painting apprenticeship, my old boss told me off when he was using an extendable boom to reach part of a school he was painting. The boom had an alarm that went off if you over extended and were in danger of tipping. Boss had to reach an upper section over the roof of a lower section but the alarm kept ringing, so he disabled it. Half an hour later the boom tipped and the boom went through the lower roof of the school :D :D :D :D :D :D

Title: Re: Ship engines
Post by Belgarion on Oct 11th, 2020 at 7:52pm

John Smith wrote on Oct 11th, 2020 at 7:45pm:

Captain Nemo wrote on Oct 11th, 2020 at 12:31pm:
LOL

Alarm goes off ...

Solution?

Shut off the alarm.  :D


Back before I started my painting apprenticeship, my old boss told me off when he was using an extendable boom to reach part of a school he was painting. The boom had an alarm that went off if you over extended and were in danger of tipping. Boss had to reach an upper section over the roof of a lower section but the alarm kept ringing, so he disabled it. Half an hour later the boom tipped and the boom went through the lower roof of the school :D :D :D :D :D :D


Unfortunately too many people think that these alarms are there only to annoy them, with predictable results.

Title: Re: Ship engines
Post by J.D. on Oct 11th, 2020 at 10:54pm
I'm pretty sure there would have been an auto mode to start those huge motors rather than a bloke run all over the place, it was good to see it in the manual mode though.

Ship engines get that big that the grease monkeys actually get inside them.

Title: Re: Ship engines
Post by Mix_Master on Oct 12th, 2020 at 10:40am
I've been toying with the idea of getting one of these, just to "stick it in the shed", and start it once in awhile.

I just need to:

1) Build a shed large enough to house it and,

2) Commercialise the arrangement, so I can hook it to the local grid, and power our town in the event of a power outage ;)

The engine is the The Wärtsilä RT-flex96C, "a two-stroke turbocharged low-speed diesel engine designed by the Finnish manufacturer Wärtsilä. It is designed for large container ships that run on heavy fuel oil. Its largest 14-cylinder version is 13.5 metres (44 ft) high, 26.59 m (87 ft) long, weighs over 2,300 tons"
worlds-biggest-diesel-engine-e1571242969689.jpg (77 KB | 23 )

Title: Re: Ship engines
Post by Carl D on Oct 12th, 2020 at 11:10am
Now, THIS is a ship engine!!

https://www.youtube.com/watch?v=u0sgiJ9_RMc

One of two reciprocating four-cylinder, triple-expansion steam engines used on the Titanic and her 2 sister ships, they drove the 2 outside 'wing' propellers.

63 feet long, 30 feet high, 720 tons (plus an extra 195 tons for the engine bedplates).

The propeller shaft extended from the left side of the engine shown in the animation.

Title: Re: Ship engines
Post by Sprintcyclist on Oct 13th, 2020 at 7:23pm

Carl D wrote on Oct 12th, 2020 at 11:10am:
Now, THIS is a ship engine!!

https://www.youtube.com/watch?v=u0sgiJ9_RMc

One of two reciprocating four-cylinder, triple-expansion steam engines used on the Titanic and her 2 sister ships, they drove the 2 outside 'wing' propellers.

63 feet long, 30 feet high, 720 tons (plus an extra 195 tons for the engine bedplates).

The propeller shaft extended from the left side of the engine shown in the animation.



What is a ' triple-expansion steam engine ' ?
Seems it has square cylinders?

Title: Re: Ship engines
Post by Sprintcyclist on Oct 13th, 2020 at 7:29pm
I'm pretty vague on this, thought ship engine ran on heavy diesel fuel.

One of the posts mentioned ' ........  Heavy Fuel Oil ....... '




Quote:
...............  Heavy Fuel Oil (HFO) is a category of fuel oils of a tar-like consistency identified as a "worse case substance".[This quote needs a citation]
Also known as bunker fuel, or residual fuel oil, HFO is the result or remnant from the distillation and cracking process of crude oil.
For this reason, HFO is contaminated with several different compounds including aromatics, sulfur and nitrogen, making emission upon combustion more polluting compared to other fuel oils.[1]
HFO is predominantly used as a fuel source for marine vessel propulsion due to its relatively low cost compared to cleaner fuel sources such as distillates.[2][3]
The use and carriage of HFO on-board vessels presents several environmental concerns, namely the risk of oil spill and the emission of toxic compounds and particulates including black carbon.
Presently, the use of HFOs is banned as a fuel source for ships travelling in the Antarctic as part of the International Maritime Organization's (IMO) International Code for Ships Operating in Polar Waters (Polar Code).[4]
For similar reasons, an HFO ban in Arctic waters is currently underway as IMO committed to the prohibition of the use or carriage of HFO within the next several years.      ...................


https://en.wikipedia.org/wiki/Heavy_fuel_oil

Title: Re: Ship engines
Post by Mix_Master on Oct 13th, 2020 at 8:16pm

Sprintcyclist wrote on Oct 13th, 2020 at 7:29pm:
I'm pretty vague on this, thought ship engine ran on heavy diesel fuel.

One of the posts mentioned ' ........  Heavy Fuel Oil ....... '




Quote:
...............  Heavy Fuel Oil (HFO) is a category of fuel oils of a tar-like consistency identified as a "worse case substance".[This quote needs a citation]
Also known as bunker fuel, or residual fuel oil, HFO is the result or remnant from the distillation and cracking process of crude oil.
For this reason, HFO is contaminated with several different compounds including aromatics, sulfur and nitrogen, making emission upon combustion more polluting compared to other fuel oils.[1]
HFO is predominantly used as a fuel source for marine vessel propulsion due to its relatively low cost compared to cleaner fuel sources such as distillates.[2][3]
The use and carriage of HFO on-board vessels presents several environmental concerns, namely the risk of oil spill and the emission of toxic compounds and particulates including black carbon.
Presently, the use of HFOs is banned as a fuel source for ships travelling in the Antarctic as part of the International Maritime Organization's (IMO) International Code for Ships Operating in Polar Waters (Polar Code).[4]
For similar reasons, an HFO ban in Arctic waters is currently underway as IMO committed to the prohibition of the use or carriage of HFO within the next several years.      ...................


https://en.wikipedia.org/wiki/Heavy_fuel_oil


You are talking about two different eras/engines.

The one linked by Carl D was in the Titanic. It "ran" on steam (or more correctly the expansion of steam). That ship carried some 6000 tons of coal to fire its boilers.

At the time locomotives, too, were steam powered.

Diesel engines were more efficient, producing more power/torque per fuel unit consumed. As a result Steam engines fell out of favour.

The engine I linked does, indeed, run on heavy fuel oil (a very basic distillate).

That engine was in service in the mid noughties (I believe several still are, in various sizes/configurations).

Title: Re: Ship engines
Post by Carl D on Oct 13th, 2020 at 11:42pm

Sprintcyclist wrote on Oct 13th, 2020 at 7:23pm:
What is a ' triple-expansion steam engine ' ?
Seems it has square cylinders?


https://en.wikipedia.org/wiki/Compound_steam_engine


Quote:
A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure (HP) cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger-volume low-pressure (LP) cylinders. Multiple-expansion engines employ additional cylinders, of progressively lower pressure, to extract further energy from the steam.


https://en.wikipedia.org/wiki/File:Triple_expansion_engine_animation.gif

In the case of Titanic and her 2 sisters, after the steam went through the 2 reciprocating engines it was then passed to a low pressure Parsons turbine engine which drove the centre propeller before the remaining steam returned to the condensers where it was cooled, turning it back to water, ready to be passed to the boilers where the whole process starts all over again, thus extracting the maximum amount of power from the steam.




Australian Politics Forum » Powered by YaBB 2.5.2!
YaBB Forum Software © 2000-2026. All Rights Reserved.