Initial Actions are designed to prepare the submarine and survivors
for escape, these actions will be conducted immediately after the
incident. The senior survivor would, at this time alert the
authorities by releasing the indicator buoy and firing a SEEPIRB and a
409 Transponder, he would then assess the situation onboard and
decide on the preferred and safest method of escape.
All escapees would put on an escape suit and deploy a single man liferaft.
This will be the preferred method of escape, in this instance, the internal pressure
will be below the escape limit, and the atmosphere will be monitored and controlled
within the calculated limits, and the radiation levels will be within the stated limits.
Planned Tower Escape
This method is used when calculated limits are reached and rescue by submersible is not available.
Immediate Tower Escape
This method of escape is used when conditions are worsening and limits may eventually be reached. This could be due to, pressure rising, or if the air provided for escape purposes had to be used.
The major factor that will determine your continued survival in a DISSUB after an accident will be your ability to control the deteriorating atmospheric conditions, that will be encountered in the compartments of a Submarine that is disabled on the seabed. To enable survival in the DISSUB, the atmosphere needs to be continuously monitored and controlled and a breathable standard must be maintained using the equipment supplied.
Increased atmospheric pressure – From internal flooding or ruptured H.P Systems – Which will raise the concentration
levels of the gases in the atmosphere.
Increased Carbon Dioxide concentration - CO2 will be purged from the body into the atmosphere every time someone exhales.
Reduced Oxygen concentration - Survivors will be consuming the oxygen in the atmosphere every time they inhale.
The presence of Carbon Monoxide, Chlorine gas and particulates from smoke may also be evident.
Radiation – From reactor systems or shielding break-down.
The enviromental temparature change, compartment temperature will change, this will be determined by how cold the surrounding sea water temperature is.
The effect of CO2 on the human body will increase when the CO2 content in the atmosphere is subjected to any increase in atmospheric pressure i.e. The CO2 effect is multiplied with every increase of 1 Bar of pressure. The survivors must continually monitor absolute pressure and be ready to make an escape at any time.
Carbon Dioxide Absorption Units (CDAU - left), powered either by ships 24 volt supply - or salt water activated batteries.
A large fan will draw air through the canisters that are filled with soda lime granuals, the granuals will absorb the Carbon Dioxide from the atmosphere.
ExtendAir® LiOH CO2 Absorbent Curtains will be introduced into service in 2007, this will improve the CO2 absorption capability onboard.
There is a continuous length of approximately 50 feet of backing materiel – with 10.5inch.panels of LiOH absorbent attached (with perforations in between
Return to Surface
©2006 Ian Callow