What components are used between trim tanks and to adjust submarines trim
Pumps
How do we alter the weight and therefore buoyancy of a submarine
Controlled flooding or pumping out compensating tanks
3 functions of HP Ballast
- Discharge contents of the compensating tanks
- Provide a backup to the HP bilge pump
- Run in parrael to HP bilge for rapid deballasting
What happens if priming system doesn’t operate effectively?
Pumps can get damaged
3 functions of the bilge system
- Collect water from bilge areas to maintain clean and dry conditions
- Discharge overboard
- Remove oil from tanks serviced by the system
State the location of the following priming plants
HP bilge
HP ballast
MP ballast
HP bilge priming- Engine room
HP ballast priminy- DG room
MP ballast priming- Electrical machinary space
Who operates submarines ballast system at sea?
SCCO operator
List 3 positions LP bilge can be operated in
- Electrical Wing Panel
- PMS
- Locally
3 services that require pressurised nitrogen gas
- Fire fighting systems
- Hydraulic accumulators
- SG blanking and sparging
What is used to increase the pressure of air in a system?
Compressor
Why is any air or gas escaping aft of 64 WTB considered to be a gas burst?
Due to the large quantities of stored nitrogen and systems that use nitrogen in these compartments
What’s the normal operating pressure of the HP air system?
276 bar
List the (A) Alternative and (B) Emergency modes of operation of the HP air system
A- Local hydel
B- Emergency bottle group, x connection valve (captains valve)
List the 3 locations of the HP and emergency blow can be operated from
- SCC
- FWD escape platform
- Aft escape platform
Where are the 4 main AV&B reducing stations?
- Ships office
- 1 Deck stbd side aft
- Manouvering room flat
- Thrust block flat stbd
What alternative systems instead of nitrogen can be used to operate VOGS
HP air
Operating pressure of AV&B?
28 bar
List 3 items of hydraulic controlled moving machinary with the potential to cause injury
- Valves
- Masts
- Bulkhead doors
What’s the function of root valves?
To isolate the distribution manifold
3 advantages of using hydraulics
- Relatively quiet
- Compact
- Simple and reliable
+ Easy to extend through hull
How many pumps are fitted on the main hydraulic plant?
1
6 services fed from main hydraulic
- Trim valves
- Ballast valves
- Bilge system valves
- Containment valves
- Compactor
- Bottle group GIV
3 advantages of using remote control fixed firefighting system
- Less risk to personel
- Less manpower intensive
- Allow immediate operation
How can we reduce the risk of electric shock when using fixed firefighting?
- Electrical isolation a compartment
