Regulations Flashcards
What is the safe working distance for scaffolding ratio
1.3m - 1m
PTW records should be kept for how long?
12 months
Active vs Passive tending
Active- manned
Passive- golden gate
What is the maximum ppO2 in water?
1.4bar
What is the max reading for CO2 in chambers?
5000ppm
State the minimum amount of OBG required on a bell dive
30 minutes of breathing gas at 40L/min (1.5ft3) at the maximum working depth.
What is considered the minimum surface visibility for DP diving operations?
Decided by the Vessel master and Diving supervisor
OR
0.5nm / 1000m
Black box recordings must be kept for;
24 hours
State the IMCA Auditing Publications for the following;
Air
Saturation
Mixed gas
Portable surface supply
Air: D023
Saturation: D024
Mixed Gas: D037
Portable S/S: D040
Divers gas supply must be heated beyond what depth?
150m
Supervisor checks before any dive include;
Ensure a permit is in place
Relevant personnel informed
Task brief, JSA, Emergency procedures
Machinery isolations and lock outs
Minimum amounts of gas and consumables available.
Suitable weather conditions
Flags and lights displayed
IMCA Publication regarding flying after diving
IMCA DMAC D07 Rev.2
Following a DCI, that is treated with full resolution of
Symptoms. How long to wait until flying?
24hrs 2000’
72hrs International Flights
Following any uneventful dive state the time to fly after diving
No D dive < 60mins
-2000’ 2hrs
-int. 24hrs
Any dives < 4hrs & Heliox Saturation
-2000’ 12hrs
-int. 24hrs
Air/nitrox/Trimix saturations > 4hrs
-2000’ 24hrs
-Int. 48hrs
Following DCI, good after first treatment
-2000’ 24hrs
-int. 72hrs
After a no-D dive less then 10min state time and proximity to a chamber
Within 20mins of a chamber for 1hr.
After repeat dives, deco dives or saturation deco state the time and proximity to a chamber
Within 20mins for 4hrs
Then
Within 2hrs until 12hrs since surfacing.
DMAC 13 rev2
Returning to work after DCI
A) Limb Pain
Uncomplicated- 7 days
Relapse- 14 days
B) Skin Bends; 7 days
C) Neurological; 28days reviewed by medical specialist.
D) Pulmonary; 3 months and reviewed by medical specialist
Before any diving operation can commence, This needs to be in place.
The diving project plan
Considerations for sea fastening
NDT any welds
Consider fuel tanks and other potential hazards
All Lars wires should be;
Non rotating
Have a 8:1 safety factor
Require annual destructive testing
Should be pressure lubricated every 6 months
Replaced every 2 years.
LARS winches must have
2 independent brakes one of which should come on automatically.
Should be documented as “man-riding”
Standby divers umbilical should be how much longer than D1?
2m longer
Divers umbilical should be restrained to be how far from any hazards like thrusters
5m
State umbilical PMS
6monthly functioned tested
2years MWP
Hot water can scald a diver when heated beyond
45degrees
Hot water must be fitted with a hi/low alarm in dive control with temperature displayed
State the max current for Normal Working dives
Recently updated to 1knt
Should be downtrending tide
Serious offshore incidents must be reported to who?
OIM
Vessel Master
Who is in responsible for the safeguarding of pipelines at a differential pressure?
Pipeline owner/operator
What equipment can the diver remove on his last decompression stop?
None, he must remain fully dressed
Name 3 documents required to be in dive control
Safety management system
Diving Manual
Company Operations Manual
Any modifications to a controlled document will be carried out by?
A person designated as a central control point such as QA/QC
What document contains guidance on the periodic examination, testing and certification of the diving plant and equipment?
IMCA D018
Categories of competent personnel and who they are
Cat1; Dive Supervisor, LSS,
Cat2; Tech
Cat3; Chief Engineer
Cat4; Manufacturer or Supplier
Minimum gas requirements for air diving
-Sufficient compressed gas for 2 emergency dives to the full intended depth as reserve.
-sufficient compressed air to pressure both locks of the ddc to maximum treatment depth (50msw) plus sufficient air for 3 complete decompression cycles
-this air must be stored in containers or else be supplied by 2 totally independent dedicated sources.
-90m3 (3200ft3) of medical quality oxygen for emergency treatment procedures
State the minimum and maximum ppO2 allowed in bailouts
Maximum
1.4bar regardless of depth
Minimum
0.4bar
Minimum ppO2 should be the same as the divers breathing gas. However the minimum is 0.4bar
What is the purpose of a bridging document
It’s used to interface between contractors and clients. It outlines work procedures, managements structures and emergency response planning.
Changes to procedures and equipment will require going through what process?
Management of Change
What is the maximum depth for surface gas diving?
75msw
Regarding surface gas diving; for dives between 0-50msw IN WATER deco should be limited to a maximum of how many minutes?
100 minutes
With regards to surface gas diving;
Dives between 50-75msw should be limited to a maximum bottom time of?
30 minutes
A basket fitted with a dome is an acceptable wet bell.
True or False?
False
Diving at Work Regulations 1997 SI 1997 No 2776
Forms the basis for the international code of practise
Notes regarding Air / Hydraulic winches; how brakes apply, number of brakes, static or dynamic test, safety factor (man riding)
AIR TUGGERS
-brake automatically applies as default
-NOT fitted with ratchet and pawl
-8:1 safety factor
BELL HYDRAULICS
-2 independant brakes
-tested seperatly ( primary dynamically secondary statically)
-brake auto applies in loss of power situation
