Airlock10

insert these into pages]]]]]]
add to construction]] GROUTING with tubes to inject into matching joint surfaces
as part of the assembly process on the ocean floor
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"TRAINLOCKS" - need diagram of AE station 'Airlocks'
BS2 have to watch ... (fades out)
Does game imply AE Traincar goes down into water ( as if its NOT 280 psi difference ) ?
Per Real Physics, an airlock is needed ahead (into Ocean) also. IF it 'just went in' past that first opening door (per fantasy) then no FIRST airlock would be required either ( the AE Station being in a trapped air bubble ) -- EXCEPT as a GAME BLOCK ( excuse for Player to do some task before the game progresses to next 'level' )
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== Maintenance Airlock Diagram ==
2 chamber with 3 doors for safety redundancy ( as shown on my maps ). The entire airlock complex has all parts pressure sealed for safety in case of malfunction.
The Airlock Chambers are thick metal ( as are the doors ), with an excess pressure capacity many times the operation pressues of Rapture's Depth (~600 feet - 280 psi)
Airlock Portals + Chambers are securely/strongly fastened/locked/anchored into the surrounding concrete building pressure shell ( which encloses all around, reinforced to the water integrity pressure standard - the buildingblock's larger mass being mostlyConcrete),
The Chambers have a grid floor/deck for fast draining, with hatches/panels for access to mechanisms under the floor ( water intake/outlet ). Cycle valves are locate under this deck for easy maintenance access.
As with mechanisms of this type, there is ALOT which is not visible. The 'workings' extend all around the parts the Player sees ( above and below ) -- even more than for the Rapture's WaterTight Doors ( ex- Securis ). 
Door Maintenance Access is located above, enabling maintenance on the door lift/seal mechanisms. It is connected to the lower maintenance area by a ladder-type pressure-sealed access tube tube. 
Airlock operates with a Quick-Fill-Empty system ( designed to minimize the Airlock Cycle time ). The system recaptures the water on emptying/ingress, and refills the chamber for egress. Basic filters are used to minimize fouling of the pump/valve mechanisms.
Only one of the Two Chambers need fill/empty (cycle) with water, and normally the other serves as backup.
Hydraulic Pistons LIFT the Doors upward - So on system failure they will lower/remain closed/sealed as a Failsafe. The doors do not open (cycle) as fast as the Securis doors do. Manual Mechanical backup operation is provided for.
The Door's thickness/weight of metal and pressure proof structure are similar to Securis doors - A 7 ft by 6 ft wide doorway surface with 1.5 ft extending into the edges slotted tightly in framed guides (metal) to properly seal the portal.
Airlock systems ar regularly 'safety tested' ( in Rapture's 'normal' times ) - Per the Rapture Safety Ordinances ( Securis doors are similarly kept tested and maintained )
* Compressed Air is used - the Compressors located on the lower level with air reservoir tanks (and additional emergency tank backups)
* Hydraulic pumps and reservoirs ( with redundancy ) to lift the airlock doors. Simpler Mechanical backups actuators also exist.
* High pressure valves and actuators (hyraulic and pneumatic)
* Water Valves and pumps and pipes and controls/indicators ( and locks )
* Pressure Differential Sensors ( You do NOT open doors until the pressure is equalized on both sides )
* Water Reservoir tanks (with filters) to drain/replace the water quickly from the Airlock Chambers
* System is mechanically interlocked so that NEVER can the doors be opened with unequal pressure inside, and only one door can be open/unsealed at a time.
* See other Airlock Diagrams for similar door water seal details
All systems/mechanisms have redundancy.
Many of Rapture's Airlocks are at Foundation level ( usually to allow direct Seabed access ), and have the further backup of the Foundation's flooding/drainage partition cells and their many maintenance doors. Those Doors are of the 'Submarine Type', and are manually operated ( costing less - but still as strong as all other pressure doors ) and are normally kept closed/sealed. 
There is little reason to have these External Access Airlocks on the normal Habitable levels of Rapture ( ordinary citizens just don't go 'Out into the Ocean' much ). The Watertight Doors we saw ( like Securis ) are normally kept un-sealed for constant Thru Traffic, and only have their watertight feature activated (closed) when there is a leak/flood emergency. 
Airlock Portals have external protective concrete 'buffers' - extended outwards to prevent outside 'things' from impacting/damaging the airlock doors/frames'.
The airlock building section blocks would be a fairly standard 'block' used repeatedly in Raptures Construction. They would be assembled on the Ocean's surface, and later transported whole and placed into the building constructions done below. They thus are already operational, so are useful at the start of building construction. ( including use of their pumps/compressors ).
The airlock building section block can be placed embedded within the monolithic layout of the primary building or stick out into the Ocean as needed.
Quick Fill compressed air Taps exist within the airlock chambers (outside too) as emergency Suit recharge ( for Daddy airtank refill ).
You would (during ingress) see Bubbles in the decompressing water - like boiling water or an opened soda can Decompressing Water Bubbles - gas coming out of solution : Same thing that happens to human blood during the dangerous event ('The Bends') of a Fast Diver Decompression. - (visual effect).
All buildings have access to at least one of this kind of Airlock for maintenance and emergency exit.
Most Machinery in the Airlock system 'breaks down' into parts which can fit thru the standard Airlock and the Submarine-type doors ( if required for heavy maintenance ).
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Efficiency and Cycle Time :
Possibility of using the differential between the Two Airlocks to minimize the pumping effort - Compression of the air/water - to be half filled when opening to the Rapture interior (at Sea Level Pressure versus outside at 20 atm @ 600ft ... )
MK1 Traincars usually go in one direction, so a QUICKk cycle In-Stop-Out between two airlocks could beutilized,
 with any longer cyle be the one between tarin visits (which is not much rushed in its timing).
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this may be dup
Pedestrian Airlocks
Those Section Airlocks we see in the games ( used for game 'level' transitions, ie- between Outer Persephone and Inner Persephone ) are actually Insufficiently Designed. They perhaps may be explanied as actually going through inter-building joints, which need to be some what flexible. What we saw perhaps are actually Seepage Sumps for that building 'joint' interface, and thus are NOT subjected to the massive pressure of direct contact with the open Ocean outside. There are nice animated pumps you see in-game through the windows within the chambers around those 'airlocks'. ( Note - The 'windows' really arent needed for the operation. )
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Add 'Level' to the glossary - the game map being broken up and requiring loading the data for the area of the 'level' (the memory NOT able to fit the full map of the game) Ref - My Game Maps being a game 'level' (most with several floors)
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