Chambers & Hyperbaric Evacuation Flashcards
What is the minimum allowable diameter of a DDC and saturation chamber
1500mm for DDC
1800mm for Sat
Chamber view ports must be changed out every 10 years from date of
Manufacture
Depth gauge and analysis lines are usually;
Small bore or Large bore
Small bore plumbing
Only treatment mix is connected to sat BIBS.
True or False
False
Bottom mix is the one online.
Treatment mix will be available.
BIBS masks and plumbing should be 02 clean
True or False
True
Hull penetrators should have what on both sides?
Valves.
Soda sorb is more effective when damp or dry?
Damp (not wet)
With regards to the saturation complex; communications should be in what locations?
Chambers
Medical and equipment locks
Dive control
Gas room
There needs to be a video feed in every saturation chamber
True or False
True
Also at medical and equipment locks and the bell trunking
Each chamber requires its own panel and gauge set?
True or False
True
Manual O2 add systems should have at least how many in-line valves?
2 valves.
Never take your hand off when adding O2
BIBS require how many hours of supply at the deepest storage depth?
4hrs per person
What are the minimum gas requirements for saturation diving.
Enough gas to press the system to make storage depth. Plus same in reserve.
Enough O2 for metabolic consumption and maintaining ppO2 on deco, Doubled.
3 weeks reserve supply of cal gas
Chamber cleaning and bedding changes should happen every how many days?
Every 3 days
Gas must be sampled from what points before it is put online?
At the quad and at the panel.
State the precautions to take when blowing down on a non breathable mix.
Divers don BIBS for at least the first 10m
Pressurization stopped at 1-3m for leak check
State chamber environmental parameters
Oxygen 350-500mb
CO2 < 5mb (0.005ata)
Nitrogen < 1000mb (1ata)
Temp 25-33 as per diver comfort
Humidity 50-70%
Depth within 0.3m or 1ft of specified depth
Chamber environmental checks should be recorded every…
1 hour
After deco, medicals are required and no work for at least 12hrs
True or False
True
Decompression can be initiated by an upward excursion
True or False
False
Upward excursion is based on the deepest depth obtained in the last 12hrs
True or False
False.
Upward excursion limits are based on deepest depth obtained in the previous 24hrs
Loss of chamber pressure may cause which physiological problems?
Decompression sickness
Barotrauma
Hypoxia
Don BIBS and or exit the chamber ASAP
Methods to maintain parameters if ECU’s fail
Lung powered scrubbers
Minimize shower use
Ice packs
More blankets
BA sets must be available in both Dive and Sat Control
True or False
True
During a fire in the chamber control room, LST will don AGA, attempt to fight the fire and transfer divers to the HRU
Minimum internal sat chamber diameter is
1.8m or 6ft
Each sat system requires an area where medical treatment can take place. State some of the areas requirements;
Bunk should be waist high
Ability to tilt patient 30degrees both at head and feet
IV drip hook
Medical lock at least 300mm diameter
Sufficient lighting
Gas treatment
Electrical hull penetrators
Comms unit
An ECU removes humidity by what process?
Condensation
What is the purpose of prophylactic ear drops?
To help prevent ear infections
State the main hazard of split level saturation’s
Leaking gas through o-ring or cross over valves causing an unbreathable atmosphere
BIBS supply external valves should be kept in which position
Open
Minimum life support time in hours for an HRU
72hrs.
CO2 scrubbing, gas, environmental controls, heating/chilling
Markings for an HRU must b shown from at least how many locations?
Markings on 3 locations while floating
Explain each of the 4 stages of an operational emergency procedure for launching an HRU
Phase A;
Transfer divers to the HRU and ready launch. (max 15mins)
Phase B;
Launch HRU and be 100m from the vessel being evacuated. (max 30min from command to launch)
Phase C; transit of HRU to reception site. (Arrive within 75% of HRU endurance)
*safe haven is where the HRU arrives on completion of transit
Phase D;
Safe decompression of divers
(In HRU, SPHL, or using LSP in HRF)
State some medical issues that may arise while in the SPHL
Motion sickness
Thermal imbalance too hot or too cold
Metabolic and bodily waste puke and shit
InSufficient CO2 scrubbing material
Contaminates
State some hyperbaric evacuation concerns
Injures or other phsiological issues
Actually being able to evacuate from your living chamber
Transit time to safe haven
Weather conditions
Publications for guidance on hyperbaric evacuation systems
IMCA D053
HRU rescue drills shall be conducted when
Prior to pressing into Sat and every 14 days there after
The HRU should have a practice deployment and recovery how often?
Every 6 months
Under extreme circumstances Accelerated emergency decompression is permissible
Yes, under extreme circumstances. Seek guidance.
3 typical ways of launching the HRU/HRC
Davit launch
Winch/push/pull/ramp
Dedicated crane
*Primary power source must be from stored energy
*Launch system must be compliant with;
SOLAS/ IMO/ IMCA guidelines
Main 2 items on a HRU/HRF Audit are;
Hardware/Equipment
Documentation
The LSP should include the following services;
Power
Gas
Heating and Cooling
Toilet facility
PVHO should undergo visual int/ext inspection plus gas leaks test to full working pressure, how often?
Every 2.5 years
Visual examination 6 monthly
Overpressure test 5 years
A DDC must have an internal over pressure test plus a gas leak test at maximum working pressure, how often?
Every 5 years
Visual examination 6 monthly
Int/ext visual plus leak test at full WP every 2.5 years
When oxygen is below this percentage, fire cannot start, regardless of ppO2
6%
O2 percentage in chambers should never exceed what %
23%
Under IMCA guidelines, all
Chambers must be two-compartment.
True or False
True
When undergoing therapeutic treatment there is no need for an attendant to be inside the chamber.
True or False
False.
A chamber attendant is required during treatment.
Under IMCA guidelines, all
DDC must be two-compartment.
True or False
True
Normal ppO2 range for therapeutic treatments is;
1.6 to 2.8 ppO2
When not is use, medical locks are kept at depth.
True or False
False.
Medical locks should be kept on surface, closed and dogged.
Medical lock operating procedures should be kept where?
Directly next to each medical lock.
With regards to DDC for air ops, no diving should take place unless…
There is a 2 compartment chamber on site or nearby.
What is the minimum amount of O2 required to be kept on site for air dive ops?
90m3 kept in reserve.
What is the maximum ppO2 via BIBS in the chamber?
2.8bar
Are dummy trunk sections similar to those of your own SPHL allowed to be used in mating trials?
No, actual physical mating trials need to happen and can help identify any issues in advance of an actual emergency.
Whats your first actions if you have a fire in sat?
Don BIBS, notify sat control, attempt to extinguish
You are the sup and there is sudden loss of pressure when guys moving from entry lock to TUP, whats your first course of action?
Blow down to maintain pressure while the guys get to a secure chamber.
Bellman left the o2 inject dumping into the bell amd is going to take an o2 hit, what is your instructions?
Get him to don BIBS and flush the bell and bring the ppo2 back in range
