Notes
Outline
Distressed Submarine Ventilation -
 & Decompression System.
RDNA Narhvalen Class.
Old & new low pressure system
Old ventilation system in RDNA Narhvalen class.
Operational requirements for the ventilation system.
Requirements from the 5 th squadron.
Improved ventilation ratio compared to the old system.
Operate from different navy vessels.
No further penetrations in the submarine hull than already established.
Operation depth  60 metres.
The system must be mechanical and not involve any elektrical systems in the distressed submarine.
The system must only occupy a minimum of space in the submarine.
Requirements from the Diving School.
Minimum ventilation quantity must fulfil minimum requirements for ” Life-support systems in submersible missions ”.
Normal ventilation quantity must fulfil minimum requirements in DMA* legislation for chamber operations.
The system must be equiped with both a primary and a secondary ventilation mode .
The assembly fittings must be quick connection couplings.
Hardwire communication between surface and submarine during the ventilation phase.
Ventilation phase to be carried out under light pressure.
The system must be able to ventilate and decompress at the same time.
The system must be ready for air transportation by a ”C 130 Hercules”.



Minimum Life-Support for Submersible operations.
Body metabolism.

( Source : ”Subsea Manned Engineering.” by Gerhard Haux )
Old & new low pressure system
Test results of flow in respectively new and old system.
Test results of flow in respectively new and old system.
Slide 10
Dräger 1 atm. Underwater Habitat ”Helgoland” 1969.
Placed in the North Sea at 31 metres depth.
Dräger Underwater Habitat ”Helgoland” 1969.
Underwater Habitat ”Helgoland” 1969.
Same ventilation principle as a distressed Submarine.
New ventilation system in RDNA Narhvalen class.
New high pressure system.
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HP regulator system equiped with 2 x 1000 Watt heating fan.
Submarine Rescue Umbilical.

All cables are fitted with ”Subconn” connectors.
Air ventilation panel onboard navy vessel.
Hatch for LP connection system in the starboard side of the conning tower on HDMS Tumleren.
Open hatch with LP quick connection valves.
Quick connection LP valves, and communikations cable.
2 x 1” Reclaim hoses connected to LP system.
250 bars HP hose mounted through the front hatch.

Top valve:      1,5” Tema” quick connection coupling mounted on a 1,5” ”Worchester” valve

Bottom valve: 3/4” 250 bars ”Svagelok” quick connection coupling mounted on a 3/8”             ” Worchester” valve
Slide 25
”TEMA” hydraulic Quick-connection coupling.
Serie 15000. For oil , gas and liquids.
High Pressure Valve.
”Svagelok” Full Flow Quick-Connects.
”QF - 12” Series ( Material 316 SS )
4000 PSI ( 272 Bars )
HP valve connection
in the conning tower
on HDMS ”Springeren”
HP inlet adapter in the conning tower on ”HDMS Springeren”.
Umbilical HP  valve connected on the Submarine HP inlet adapter.
Umbilical HP  valve connected on the Submarine HP inlet adapter.
High pressure inlet regulator system in the bow torpedo room.
Containerized submarine ventilation system onboard the danish supply unit  ”Gunnar Seidenfaden”.

The complete system consist of
4 standard 20” ISO containeres,
2 Junker compressores and 1
umbilical launching frame.


Supply capacity:

Compressors:      2 x 1250 ltr./min. at 250 bars

Container nr. 1:   air group nr. 1 = 120.000 ltr.
                   air group nr. 2 = 120.000 ltr.
                         air group nr. 3 = 120.000 ltr.
                         oxy group       =   40.000 ltr.

Container nr. 2:   air group nr. 1 =  50.000 ltr.
                         air group nr. 2 =  50.000 ltr.
                         air group nr. 3 =  25.000 ltr.
Placement of containerized Submarine ventilation system
on board supplyship.
Collapsible umbilical launching frame.
Transportable compressors.
Master container with complete first action equipment.
Hydraulik suction pumps mounted
on the door in the mastercontainer.

The container include 1 mobile
”Stanley” hydraulic station.

Air stores, filters and diving
equipment in the master
container.

First hand air stores capacity
is 125.000 ltr. at 250 bars.

If connected to exterior
compressorsystem , the
cleaning capacity is about
3500 ltr./ min. at 250 bars.

The container have 1 diving
station for two divers and
one station for submarine
ventilation / decompression.

The container is completely
operational equipped, and can
be used as a stand alone unit.
Control rack in main container.
Filter system and air stores.

HP distribution board.
Submarine ventilation station.
Outlet measurement system.
Slide 45
Slide 46
Diving education vessel ”Læsø” with wet bell and Submarine Rescue Umbilical.
Submarine simulator.
Submarine Simulator
Old Danish ventilation system.
Mod. ( 1916. )