Class Questions Flashcards
Every piece of documentation may be regarded as a legal document
True
Recording of diving communications should be kept for a minimum time and should include information on?
48 hours minimum and include equipment and personnel checks
HSE ACOP 1997
IMCA D014 (states 24 hours)
The contractor requests an increased amount of lift bags to a project procedure for the installation of a spool. Do you need a new risk assessment?
Yes you need to fill in a CRF(change request form) and produce an MOC which will include a new lift plans and risk assessment
The contractor is responsible for producing a updated Risk Assessment, which would be then signed off and replace the original Risk Assessment
True
What is a safe level of CO2
2500ppm
At what level does H2S produce symptoms?
10ppm
Above what % Oxygen should be handled as 100%
25%
Can O2 and Nitrogen cylinders be stored together
NO!
Cylinder colours are too similar
Paramagnetism is used to analyse
Oxygen
What is used to analyse carbon dioxide
Infared
When calibrating a gauge what is rule of thumb
Follow Manufacturers instructions
How much soda sorb is calculated per diver per day
6kgs/ Diver/ Day regardless of depth
Soda lime absorbs
20-30% of its weight in CO2
(1kg =120g of CO2)
Composition of Soda Lime
80% Calcium Hydroxide
5% Sodium and Potassium Hydroxide
15% Water
What level of PPO2 is normal for a saturation environment?
350-450ppm
What level of ppCO2 is normal for a saturation environment?
<5000ppm
What is the normal temperature range for a saturation environment?
28-34°C
How much soda sorb will be required for a 70msw saturation for 12 days including deco for 10 divers?
720kgs (6kgs/diver/day)
Who has the legal responsibility for TUP?
On shift Supervisor
IMCA DO22 Rev 1 13.7
How much soda lime for 28 day Sat including deco for 24 divers?
6kg/day x 28 days x 24 divers
=4032kgs
IMCA DO22 Rev 1 2.36
During a decompression diver reports flicking eyes, feels unwell. What could be the cause?
Nystagmus. Acute Neurological DCI
What is the max recommended O2% in a chamber?
25% O2
IMCA D014 Rev 1 4.6.5
Bellman reports the CO2 level is 2480ppm in the bell at 90m.
What is the %
2486 divided by 10000= 0.2480%
Following surfacing a diver complains of feeling weak and fatigued, what could he be suffering from?
Acute neurological DCI
How often should a dive project risk assessment be reviewed to check the need for revision?
At regular intervals
A DSV is on DP in a Scottish Loch. Water depth 200 msw, divers are at 25m. Which diving Reg/ ACOP covers this operation and why
Offshore Diving Reg because the vessel is on DP.
What is the minimum surface visibility considered safe for DP
Decided by Master and Dive Supervisor.
IMCA DO14 Rev 1 7.3.7
IMCA D022 Rev 1 4.8
How long should the vessel hold position on DP before diving operations commence?
30 minutes
The main gas umbilical supply on the bell for the diver must be fitted with a ?
Non return valve
An imminent gale warning is?
6 Hours
IMCA DO22 Rev1 Appendix 3
What is the colour of a CO2 cylinder?
Black cylinder body grey neck
A smoldering chamber fire
Divers on Bibs and attempt to extinguish
Following a successful therapeutic treatment a diver should not fly for
48 hours
DMAC 13 & 07
Who is legally responsible for the TUP
On Shift Supervisor
TUP IMCA D022 Rev 1 13.7
Pulmonary O2 Toxicity may occur when the PPO2 exceeds-
0.6ATA
During a dive, the diver complains on sweating, nausea, headaches and is breathing rapidly. He is suffering from-
CO2 poisoning
A blocked Eustachian tube will cause?
Aural Barotrauma
Metabolic O2 consumption is related to CO2 production. What is the ratio?
1:1
Which physical areas does the ACOP apply to?
From 12 nautical miles from the low water limit to the limit of UK designated areas of the continental shelf
Breakage in the bell umbilical can be indicated by?
Loss of camera, main gas, depth indication, comms, heating supply
A SPHL must be able to maintain life support for a minimum period of?
72 hours
IMCA DO52 Hyperbaric Evacuation Systems
IMCA DO14 states that depth gauges are to be tested and certified every:
6 months
Also read D018
A supervisor needs to have been a qualified diver unless:
He was supervising for a 2 year period prior to 1981
ACOP Reg 9, par 163( Grandfather Clause)
When recovering a bell from a saturation dive, the winch operator should observe?
The wire spooling onto the drum
What is considered the upper limit for current in diving operations?
1.5knots
IMCA D067 for revised maximum currents
Where should the divers pneumo hose be located?
Accessible at chest level
Bell handling system should provide.
Easy and firm mating to and from the chamber
A helmets main gas is checked how
Bail out bottle open, emergency valve closed and divers supply panel valve open
Is granulated sugar allowed in a chamber
No
The recommended bell divers minimum onboard gas supply should last how long for the working depth
30 minutes minimum
How much soda sorb is used by a diver per day
6kgs /diver/ day regardless of depth
What is the recommended maximum O2 allowed in a chamber during decompression?
25%
IMCA D014
O2 above 25% is treated as pure O2
The medical lock interlock is faulty what should you do
Report it to the LSS and Dive tech do not use until repaired
Is the South African Class IV dive ticket accepted by HSE
No
HSE regs 1997
List of approved tickets 1 Dec 2021
If the main gas supply to the bell failed what would your actions be?
Panel should automatically change to onboards. Bellman should see this in drop on main gas up stream supply gauge. Recover divers to bell
What is the maximum depth you would administer 100% O2
18msw
This is 2.8bar and is legally the highest you can give
Table 6(RNT62)
When putting a gas quad on line what is the procedure?
Open all cylinder valve fully open and half a turn back. Then open the king valve all the way and half turn back
Offshore diving communications should be recorded until when
Until the diver returns to where he started the dive
Only the minimum required gas is onboard to carry out a dive. What would you do?
All diving stopped until gas stocks replenished
ACOP para 61
DMAC recommended PPO2 in a bailout bottle is
1.4bar
Your bell diver is suffering from Hypercapnia what would you do.
Put the diver on BIBS
How much soda lime is required for a saturation dive to 70msw for 10 days including deco for 12 divers?
6kg/day/diver x10 x12=720kg
Umbilicals must be tested to their max working pressure every
2 years
IMCA D018 section 28
Lift Bag Saftety factor
5:1
Lift Bags are load tested every
12 months
Lift Bag visual inspection is done every
6 months
Webbing slings have a safety factor of
7:1
SMS stands for
Safety Management System
TRA stands for
Task Risk Assessment
Describe a Near Miss
A load transferred from the vessel to the quayside was found to have had a loose shackle resting ontop of the load that could have fallen off.
An Observation is,
Something is see, a loose shackle was seen laying ontop of a load that was being rigged to lift. And was removed
