revision sheet Flashcards
List the hydraulic systems fitted on a vanguard class submarine
- Main hydraulic system
- External hydraulic system
- After hydraulic system
Describe the function of the main hydraulic system and list all modes of operation
Function:
To maintain the main hydraulic supply pressure between 180 and 207 bar.
Modes of operation:
- Run
- Standby
- Emergency
List the major components of the main hydraulic system and a brief description of what they do
- Replenishment tank - a 1225 litre reservoir of hydraulic oil fitted with a return line and oil cooler
- Silencer - Reduces noise from the hydraulic pump
- Unloader valves - maintain system pressure between 180 and 207 bar and allow the pump to continuously run
- Accumulator - Allows the system to cope with high system demands by smoothing out pulsations from the hydraulic pump
- FIV - Fitted to the discharge line to isolate the plant from the system
- Relief valve - Protects the plant and system from over pressurisation if the unloader valve fails
- Cooler - A chilled water cooler cools the oil returning to the rep tank
- System isolation valves - Isolates equipment or to x connect systems
List 4 items that are supplied by main hydraulics
- Foreplanes
- GIV’s
- Rudder
- Main vents
List 4 items supplied by the external hydraulic system
- Diesel exhaust mast
- SN mast
- Mast shutters
- radar mast
What are the actions in the event of a hydraulic burst at the scene
- Raise the alarm in whatever means possible
- Identify the burst site
- Locate and don ebs
- Attack hydraulic mist with dry powder extinguisher
- Isolate burst site if possible
- Brief APL on any actions taken or isolations made
List the EOP actions to be taken on the scc for a hydraulic burst
- FMB, general alarm x 3
- Crash stop ventilation
- Shut down bulkheads
- Line up trim system for firefighting
- Shut casualty plant FIV’s
- Stop casualty plant pumps
Who controls hydraulic isolations onboard?
APL
What is the function of the hydroplanes and steering system?
- To control the submarines heading and depth within pre-determined limits and control and monitor all surfaces
List the 3 control surfaces
- Foreplanes
- Afterplanes
- Rudder
What is the primary, secondary and emergency modes of operation for the 3 control surfaces.
- Autopilot
- Manual
- Rate control
Describe how the operation of stickwheel 1 works
- Provides one man control of the foreplanes, afterplanes and rudder
- Course and depth is controlled manually by use of the stickwheel
- Move the stickwheel backwards to rise
- Move the stickwheel forwards to dive
- Turn the wheel to control the rudder
Describe the fittings on the tactical masts
- Thermal imaging camera
- Low light television
- omni directional ESM warner antenna
- quasi-binocular 4 lenses periscope
- Closed circuit digital television
- Six electronic surveillance measures
- Communications antennae
List all masts and periscopes and give a brief description of each
- Diesel exhaust mast -
- SN mast
- Navstar gps
- Stbd WT
- Tactical masts
- fwd periscope
- Radar
- port WT
- UHF aerial
- VEX mast
Which masts are fitted with shutters
Tactical masts and radar mast
Which masts are controlled by main hydraulics
Tactical masts and fwd periscope
What are the precautions prior to raising a mast/periscope in harbour
- Obtain permission from OOD
- Ensure hydraulic pressure is available
- No tag outs in force
- Check that the fin is clear of all personnel and obstructions
- Sentry manning the bridge and in comms with the scc
- Check that there are no overhead obstructions, such as a crane
What are the safety precautions associated with working in a mastwell?
- Obtain permission from OOD/OOW
- Mast/periscope raised and pinned
- Mast/periscope tagged out
- LDT briefed of personnel working in mastwells
- Two man rule used on entry to mastwell
What is the procedure for manning ships systems in hand / hydel control in the event of a 24v dc failure?
What are the functions of the ventilation system?
- Distribute fresh air induced from SN mast
- re-circulate air when dived
- Supply air at the desired temp and humidity to provide a comfortable environment for the crew and equipment
- Remove impurities and odours and renew oxygen via air purification equipment
- Provide continuous air flow across the battery to prevent a dangerous H2 build up
- To provide adequate air supplies to run the DG’s when snorting
- Discharge stale air overboard
- Enable all compartments onboard to be purged of contaminated air
Describe vent state red.
Air is exhausted through the RC and is discharged via the vex system
Name 4 pieces of air purification equipment
- COGS
- LP electrolyser
- GMP
- CO2 scrubber
Which hydraulic system controls the rudder?
Main hydraulic system
State the actions taken at the scc in the event of a fire
- Raise the alarm
- FMB, general alarm x3
- Start stop watch
- Crash stop ventilation
- Shut down 48 and 67 bulkheads on the panel
- Line up the trim system for firefighting
- Break out and test EBS
- Contact shore authorities
state the actions taken in the event of an hp gas burst
- Don ebs immediately
- Raise the alarm in the quickest way possible
- The SM will not go to emergency stations for a gas burst
- Attempt to identify and isolate the burst.
- If you cant wait for the mechanical repair party or compartment watchkeepers
- Any isolation made must be reported to the APL including valve name and number
- If gas burst is confirmed as an air burst then ebs can be removed
- Other initial actions will be carried out depending on whether the sm is at sea or in harbour
- Actions will be carried out by qualified watchkeepers
What are the 3 masts associated with the ventilation system?
- SN mast
- diesel exhaust mast
- vex mast
Where is the ventilation system controlled from?
The SCC
List 4 reasons that we may stop ventilation
- In response to an emergency
- To allow line up to another vent state
- Entry to a fan room or the battery compartment
- To reduce the SM’s acoustic signature
State and explain the 5 ventilation states
vent state green - Normal vent state dived or surfaced
vent state purple - alongside or in transit on the surface
vent state yellow - Battery compartment purges/ smoke clearance/ blowing round
vent state blue - Diesels running for battery charge /smoke clearance
vent state red - Reactor compartment purge
What is the function of the SN induction system?
Provide fresh air sufficient for the needs of the diesel engines and ventilation system when the sm is surfaced or at snort depth
List the major components of the SN induction system
- Snort mast
- Snort head and float valve
- Induction hull vv
- The emergency flap vv
- Water separator tank
- SN induction fan
- Flood, drain and vent valves
What is the function of the ventilation exhaust system
- To exhaust stale air overboard
- To ventilate the reactor compartment
- To ventilate the battery compartment of hydrogen
- Smoke clearance and compartment purge
What is the purpose of LPB 0601
Diverts lp air overboard via vex mast or MBT’s
What is the function of the diesel exhaust system?
To provide a discharge path for the diesel exhaust from the sm when on the surface or at snort depth
List and explain the major components of the diesel exhaust system
- Diesel exhaust mast - Constructed from a hollow outer tube that slides over a hollow fixed inner tube. The exhaust gasses are forced out under their own pressure
- Hull valve and backup valve- Shuts automatically when the diesel shuts down to prevent ingress of sea water into the exhaust system
- Diesel exhaust mast cooling spray - Protects the mast and head from excessive heat damage, the gasses are passed over a set of sprays which cools them.
