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Subject: "Boiler Rooms Air Screens" Previous topic | Next topic
Karol_WSat Feb-11-17 06:28 AM
Member since Dec 10th 2016
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#54643, "Boiler Rooms Air Screens"


          

Good Morning.

When i was checking plans of Boiler Rooms Nos 1 & 2 i found something that i did not notice before. Looks like the wall of fidley which is facing to lower funnel is extending down to the level of G deck beams in Boiler Room. I did a bit of research into this and found that this structure is called air screen.



I found only 2 books which are talking a bit more about them. Those books are 'Machinery and Pipe Arragement on Shipboard' and 'The Marine Steam Engine'. These books, especially the first one also consist plans of Boilers Rooms where those air screens are visible. And this is a moment where i'm confused.

The reason for why i'm confused is that in case of Titanic Boiler Rooms, those air screens are visible on Longitudinal Plan only. They are nof included on other plans of those spaces. And a question that raising in my mind is: What shape those air screens had?

The picture below shows three possibilities that i think are plausible.

1. Red - air screen is following the shape of the boiler uptakes
2. Green - air screen extends to full width of F deck level and goes down to uptake, then extends further outward to match the shape of uptake.
3. Yellow - air screen extends to full width of F deck level, then extends further outward to columns on G deck level of Boiler Room.

I also think that the inner walls of coal bunkers on G deck also had air screens.



Problem is that i do not have any more information that would give me a possiblity to say what version is correct. Any thoughs?

Regards.

Karol

Attachment #1, (jpg file)
Attachment #2, (jpg file)

  

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Ralph CurrellSun Feb-12-17 10:29 AM
Member since Mar 31st 2007
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#54647, "RE: Boiler Rooms Air Screens"
In response to Reply # 0


          

Hi Karol,

I don't have any information beyond what you've posted here. I would guess the screens follow the shape of the boiler uptakes, but there's really very little evidence to go on.

Regards,
Ralph

  

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Bill WestSun Feb-12-17 01:15 PM
Member since Feb 02nd 2010
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#54648, "RE: Boiler Rooms Air Screens"
In response to Reply # 1


          

Hi Karol.
What you have circled on your first drawing is one wall of the air vent up from the boiler room. The solid line to the left of it is the air screen. The dashed line to the left of that is the actual uptake. On most drawings the air screen is more prominent than the uptake.

At one point in Mr. Pounder's pg19 drawing, what he has marked as an air screen is just one wall of an air vent.

I think the various parts we are looking at are:
-The boiler room casing is part of the ship's structure. It starts from the outer funnel and is formed by the bulkheads from the fiddley top down to E deck. That deck, the bulkheads outside of the fan rooms, F deck, and the hull complete the enclosing of the boiler room.
-Against the fore and aft walls of the casing are the draft air ducts down to the fan rooms and the vent air ducts back up. The draft duct is formed by the casing down to E deck and a divider down to F deck. The vent air duct is formed by that same divider and the divider you pointed out starting up from G deck. As you say it shows on the side to side cross section drawings but not on the fore-aft drawings so I am not sure how it runs. There are walkways and pipes that might interfere with it. It may also be part of that extra wall you pointed out on the side bunkers.
-The uptake starts from the boiler front and runs in a streamlined shape all the way up the funnel.
-The air screen closely encases the uptake from the top of the cleanout doors on the boiler front up to the fiddley top.

Probably what we need here is an isometric drawing to sort the shape of the vent air duct at G deck.

Bill

  

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Karol_WSun Feb-12-17 02:41 PM
Member since Dec 10th 2016
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#54649, "RE: Boiler Rooms Air Screens"
In response to Reply # 2


          

>Hi Karol.
>What you have circled on your first drawing is one wall of the
>air vent up from the boiler room. The solid line to the left
>of it is the air screen. The dashed line to the left of that
>is the actual uptake. On most drawings the air screen is more
>prominent than the uptake.
>
>At one point in Mr. Pounder's pg19 drawing, what he has marked
>as an air screen is just one wall of an air vent.
>
>I think the various parts we are looking at are:
>-The boiler room casing is part of the ship's structure. It
>starts from the outer funnel and is formed by the bulkheads
>from the fiddley top down to E deck. That deck, the bulkheads
>outside of the fan rooms, F deck, and the hull complete the
>enclosing of the boiler room.
>-Against the fore and aft walls of the casing are the draft
>air ducts down to the fan rooms and the vent air ducts back
>up. The draft duct is formed by the casing down to E deck and
>a divider down to F deck. The vent air duct is formed by that
>same divider and the divider you pointed out starting up from
>G deck. As you say it shows on the side to side cross section
>drawings but not on the fore-aft drawings so I am not sure how
>it runs. There are walkways and pipes that might interfere
>with it. It may also be part of that extra wall you pointed
>out on the side bunkers.
>-The uptake starts from the boiler front and runs in a
>streamlined shape all the way up the funnel.
>-The air screen closely encases the uptake from the top of the
>cleanout doors on the boiler front up to the fiddley top.
>
>Probably what we need here is an isometric drawing to sort the
>shape of the vent air duct at G deck.
>
>Bill

Good Evening Bill.

I'm not sure if i fully understand what you wrote. But if i understand you correctly, red lines create the actual uptakes, orange are air screens, light blue is a fidley wall right on top of air screen and green is vent shaft supplying fresh air to stokehold fans.



As far as i know the boiler uptakes are some kind of double-layer structure. The actual uptake is inside the steel structure of simillar shape but bigger. The air gap between those 2 structures serves as some kind of 'air insulation' to prevent overheating the surrounding space. Correct me if what i wrote is wrong.

In term of this isometric view - i'm affraid something like this does not exist. I think we would need to create something like this by our own.

Regards,

Karol

Attachment #1, (jpg file)

  

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Bill WestSun Feb-12-17 03:56 PM
Member since Feb 02nd 2010
439 posts
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#54650, "RE: Boiler Rooms Air Screens"
In response to Reply # 3


          

Hi Karol, what you have drawn and written is exactly what I meant. For an isometric I indeed meant that we would have to make one. I have used coloured pencil lines and shading on various prints and it helped but I'm not sure it can explain everything.

Bill

  

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Titanic artwork at top of page is owned and copyright of Stuart Williamson and is used with permission.