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Author Topic: School of the boat for 9 Sept 08  (Read 7313 times)
JTheotonio
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« Reply #15 on: September 14, 2008, 09:34:41 AM »

I think they came over with one of the Turkish boats that visited us.
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Darrin
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« Reply #16 on: September 14, 2008, 11:53:53 AM »

Ok folks WHAT else are we missing from the LOW pressure air system?Huh? now that we have covered the basics and the sickening things that can happen when using the LP air for what it was intended for and people aren't properly notified 2funny
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JTheotonio
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« Reply #17 on: September 15, 2008, 08:09:22 AM »

OK, I’m not sure what Darrin is still after, so here goes nothing as they say…

First there are 5 main air systems on the Balao-class submarine

1.   3000# High Pressure and Torpedo Impulse air
2.   600# MBT blow system
3.   225# service air system
4.   10# MBT blow system
5.   Salvage Air system

So if Darrin is talking about low air pressure system, he may just be referencing the 10# MBT blow system because the 225# air maybe low but it is dangerous.  Also. because is has so many reductions to other pressures, it is widely used for justd about anything.  Common reductions include 100#, 13#, 12#, 10# and 8#.

The 10# MBT blow system has a LP blower, driven by a 90 HP motor, located in the pump room, a manifold located in the control room, and 9 blow lines extending out of the manifold through the pressure hull that run outside in the superstructure to all ballast tanks. (1 – 7).  Each tank is control by a flapper valve and swing-check valves.  There is also a gate check valves that are operated from the deck. 

The 10# MBT blow system is used on the surface to complete the job of blowing the MBT’s that is done by the 600# MBT blow system.

In addition, the 10# MBT blow system is used for list control during and after blowing the main ballast tanks.  This is done using the list control dampers to adjust the amount of air admitted into the port and starboard MBT (#2 and #6 groups – remember each group has four main ballast tanks - A, B, C, D).  The dampers are located at the Y connections of the 10# Blow Manifold, and are hand operated at the aft end of the manifold.

Important – the 10# manifold and its valves are designed to withstand sea pressure if any blow line fails.

So the 10# MBT has two main functions – 1) complete the blowing of the main ballast tanks (and fuel ballast tanks if needed), and 2) list control using the #2 and #6 MBT groups.
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« Reply #18 on: September 15, 2008, 08:56:40 AM »

That was what I was looking for JT, great job all...
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JTheotonio
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« Reply #19 on: September 15, 2008, 10:12:37 AM »

 Cheesy went crazy (ier) looking this one up! Good question to makie a person think! Thanks.  crazy2

And Lance you still had a great answer!
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Lance Dean
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« Reply #20 on: September 15, 2008, 10:24:54 AM »

LOL oh well.  I never realized air was used for so many things.
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JTheotonio
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« Reply #21 on: September 15, 2008, 12:44:03 PM »

Air is one of those things we can't live without in a submarine! Unless you have the portholes open that is crazy2
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« Reply #22 on: September 15, 2008, 01:39:16 PM »

That closes out the LOW pressure air systems and now IF you have a museum boat near and you start your walk through you will be able to hopefully have a better understanding of what all of the valves in the overhead were for and why they are there and yes there are a few boats that have most if not all of their airbanks brought back online, granted they will never see 3000 PSI ever again but they are still used for starting the diesel's and blowing the tanks dry and the big one for all of us is for using air tools.

Tomorrow's school of the boat we will be working with the HIGH pressure air system.
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