Diving bell dry/ Saturation



Duties, responsibilities and requirements

1. Employer

Below are all Duties, Responsibilities and Requirements the employer has to comply with

1.1 Work instruction (2 risks)

Risk

Work instruction not in line with the law and legislation and industry standard

Minimum control measure

Version control, list of changes, evaluation and maintenance (custodian/ secretary)

Reference

Risk

Work instruction incomplete (unsound work instruction)

Minimum control measure

Minimum contents:

* Responsibilities and authorities

* Equipment and maintenance

* Diving procedures, including emergency procedures (see: Emergency Procedures and Contingencies)

* The Standby diver deployment and preparedness/ the level the standby diver needs to be dressed

* Facilities and procedures for situations which deviate from commonly occurring work situations

* Guidelines for decompression

* Reporting accidents and medical assistance

* Composition and use of the First Aid equipment

* Team composition (size, qualifications and tasks and authorities)

To the reference page.

Reference

AB article 6.15 paragraph 1a (sound work instruction), IMO resolution A. 692(17) Guidelines and Specifications for Hyperbaric Evacuation Systems

1.2 Work situation (1 risk)

Risk

Insufficient assurance of a safe work situation

Minimum control measure

Availability of a RI&E

Providing a safe and suitable work location

Recording of tasks and responsibilities of third parties

Naar de pagina naslagwerk.

Reference

 

AW:  article 5, IMO Resolution A.831 (19) Code of Safety for Diving Systems

AW: article 19

 

1.3 Contents Work plan (1 risk)

Risk

Work plan is incomplete

Minimum control measure

Minimum contents of work plan:

* Project specific Tasks, Responsibilities and Authorities

* Project specific RI&E.

Reference

 

1.4 Physical load (1 risk)

Risk

Physical load

Minimum control measure

Inventorise heavy material, provision of information/ advice

To the reference page.

Reference

AB:  Chapter 5 Section 1

2. Client/ third parties

2. Client/ third parties

2.1 Information to the contractor (1 risk)

Risk

Providing incomplete information to the contractor

Minimum control measure

Formal recording of tasks, responsibilities and authorities of all parties concerned, for example by means of a work permit system to avoid endangering the contractor

To the reference page.

Reference

AW: article 19

3. Diving Supervisor

3. Diving Supervisor

3.1 Familiarity work instruction and work plan (1 risk)

Risk

Insufficient familiar with the Work instruction and the Work plan

Minimum control measure

Diving Supervisor shall be given sufficient time to become familiar with the Work instruction and Work plan

Reference

 

3.2 Familiarity diving system (1 risk)

Risk

Insufficient familiar with the diving system

Minimum control measure

Diving Supervisor shall be given sufficient time to become familiar with the hyperbaric system / diving system being used

Reference

 

3.3 Personnel ( 1 risk)

Risk

Not suitable/ trained/ examined

Minimum control measure

The diving supervisor is checking whether the diving team is suitable for the tasks the diving team is planned to execute and or the diving team is in possession of the correct and valid (diving) certificates and a valid medical examination

Reference

3.4 Breathing gas (2 risks)

Risk

Insufficient quantity of breathing gas

Minimum control measure

In case of emergency the diver shall be able to make use of such a quantity of reserve breathing gas which will allow him to abort the dive and to complete it in a safe manner. Hereby use can be made of a checklist, check by the diving supervisor, reserve pressure warning system (active or passive depending on the circumstances) and a dive planning/ dive worktime calculation. Working in accordance with the WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements
AB 6.15 paragraph 1 b

Risk

Incorrect breathing gas

Minimum control measure

Prior the dive the diving supervisor shall ensure that the correct breathing gas is used (See also Duties, Responsibilities and Requirements item 1.5)

To the reference page.

Reference

AB 6.15 paragraph 1 b

4. Divers

4. Divers

4.1 Familiarity work plan (1 risk)

Risk

Insufficient familiar with the Work plan

Minimum control measure

Divers must be sufficiently instructed. Proper instruction (for example start work meeting/ kick-off) and formal recording of tasks and responsibilities

To the reference page.

Reference

AW: article 8, AB: article 6.15

5. Diving assistant (Tender)

5. Diving assistant (Tender)

5.1 Familiarity work activities (1 risk)

Risk

Insufficient familiar with the work activities under hyperbaric conditions and the associated tasks and responsibilities

Minimum control measure

Proper instruction (for example start work meeting/ kick-off) and formal recording of roles and responsibilities

To the reference page.

Reference

AW: article 8, AB: article 6.15

6. Other supporting personnel

6. Other supporting personnel

6.1 Familiarity work activities (1 risk)

Risk

Insufficient familiar with the work activities under hyperbaric conditions and their associated tasks and responsibilities

Minimum control measure

Proper instruction (for example start work meeting/ kick-off) and formal recording of roles and responsibilities

To the reference page.

Reference

AW: article 8, AB: article 6.15


Equipment

1. Equipment general (5 risks)

Risk

Damaged

Minimum control measure

Equipment management, checking by diver and diving supervisor, working in accordance with WOD-SOE

To the reference page.

Reference

 WOD-SOE Maintenance system requirements

 

Risk

Not inspected

Minimum control measure

Checking by or under the responsibility of the diving supervisor, working in accordance with WOD-SOE

To the reference page.

Reference

 WOD-SOE Detail sheets

 

Risk

Unsound

Minimum control measure

Checking by or under the responsibility of the diving supervisor, working in accordance with WOD-SOE

To the reference page.

Reference

WOD-SOE

- Detail sheets

- Minimum system requirements

 

Risk

Prepared incorrectly and or not working

Minimum control measure

Checking by or under the responsibility of the diving supervisor, working in accordance with WOD-SOE

To the reference page.

Reference

 WOD-SOE

- Maintenance system requirements

- Detail sheets

- Minimum system requirements

 

Risk

Non compliance with the minimum system requirements

Minimum control measure

Working in accordance with WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements and  IMO

2. Breathing gas (1 risk)

Risk

Wrong breathing gas quality

Minimum control measure

Periodic inspecting installation and before use inspection of examination/testing report, working in accordance with WOD-SOE

To the reference page.

Reference

 WOD-SOE Detail sheets

3. Transportation of a (wounded) diver to and from the diving work location (1 risk)

Risk

Incurring injury, damage diving equipment or delay

Minimum control measure

The availability of a suitable device allowing the diver to safely enter and exit the liquid in which the diving work is carried out

The availability of a means to bring in case of an emergency a wounded or unconscious diver on deck and/ or ashore. Working in accordance WOD-SOE

To the reference page.

Reference

WOD-SOE minimum system requirements


Personnel

1. Qualification and competence

1. Qualification and competence

1.1 Diver (2 risks)

Risk

Not qualified and/ or incompetent diving personnel

Minimum control measure

Training, practice, competence verification and checking of certificates and notification by the diver

To the reference page.

Reference

AW: article 11, AB: article 6.14 and 6.16, AR: Chapter 6 and Appendix XVIc

 

Risk

Lack of practical experience or specific practical experience

Minimum control measure

The number of divers used with no or restricted specific practical experience shall be considered during the work preparation phase

Reference

1.2 Standby diver (2 risks)

Risk

Too late ready to assist a diver in distress

Minimum control measure

1. A standby diver must be present at the diving location

2. The standby diver must be immediately ready and completely dressed, except for his mask or diving helmet, if diving work is carried out under the following conditions:

- With current/ tidal conditions above 0.5 metres per second

- When diving is carried out under hazardous conditions

- In case of high probability the diver will get stuck to something

- In any other situation when the diving supervisor is of the opinion there is a need that a diver requires immediate assistance

3. In any other situations the standby diver must be immediately available, the diving equipment be ready, tested and ready for immediate use.

4. Mining industry and Energy generation related diving work requires the standby diver to be immediately ready and completely dressed, except for his diving helmet.

To the reference page.

Reference

AB: article 6.16, AR: Chapter 6 and Appendix XVIc

 

Risk

Minimum control measure

When a dry diving bell is used the standby diver is present in the bell. In addition on the surface there shall be another standby diver present, inclusive equipment, who can assist within the range of diving with breathing gas supply from the surface/ Surface Supplied Equipment (SSE). It is not necessary that this diver is fully dressed.

 

To the reference page.

Reference

AB: article 6.16, IMCA D 014

1.3 Deck crew/Riggers (1 risk)

Risk

Incompetent personnel

Minimum Control measure

Training, practice, competence verification in accordance IMCA or equivalent by employer and notification by the employee

To the reference page.

References

IMCA C002 and AW: article 11

1.4 Life Support Personnel (1 risk)

Risk

Not qualified and/ or incompetent diving personnel

Minimum Control measure

Training, practice, competence verification in accordance IMCA or equivalent, checking of certificates by employer and notification by the employee

To the reference page.

References

IMCA C003 and AW: article 11

1.5 Dive technician ( 1 risk)

Risk

Incompetent personnel

Minimum control measure

Training, practice, competence verification in accordance IMCA or equivalent by employer and notification by the employee

To the reference page.

Reference

IMCA C003 and AW: 11

1.6 Diving Supervisor (1 risk)

Risk

Not qualified and/ or incompetent diving personnel

Minimum control measure

Training, practice, competence verification and checking of certificates by employer and notification by the employee

To the reference page.

Reference

AW: article 11, AB: article 6.14 and 6.16, AR: Chapter 6 and Appendix XVIb

1.7 Diving medical attendant/diver medic (2 risks)

Risk

Not qualified and/ or incompetent diving medical attendant/ diver medic

Minimum control measure

1. Training, practice, competence verification and checking of certificates and notification by the employee
2. For diving work in:
- Category A2, A3, B1, B2, B3 and B4 and C (not being saturation diving) (WSCS-WOD-D) the diving medical attendant/ diver medic shall as a minimum be in possession of a certificate Diving Medical Attendant  (MAD A)
However by diving work in circumstances where adequate medical care is not sufficiently quick available, in that situation the diving medical attendant/ diver medic shall as a minimum be in possession of a certificate Enhanced Diving Medical Attendant (MAD-B).
To decide if the available medical care is adequate or sufficiently quick available shall be established by means of a RI&E
- Category C the diving medical attendant/ diver medic shall as a minimum be in possession of a certificate Enhanced Diving Medical Attendant (MAD-B).

To the reference page.

Reference

AW: article 11

AB: article 6.15 paragraph 1c (diving medical attendant/ diver medic)

AR: Chapter 6 and Appendix XVId

Risk

Not available for attending hyperbaric treatment in the compression chamber

Minimum control measure

- When this diving medical attendant/ diver medic is a member of the diving team, he may not himself be diving nor may he in the previous 12 hours have been diving deeper than 9 meters
- Only in case the diving team is allowed to consist of 2 persons (Category A1, pursuant to AB article 6.16, 4th paragraph and Working Conditions Catalogue: Personnel point 2), the diving medical attendant/ diver medic  may also perform the role of diving supervisor  and standby diver;  the above mentioned 12 hours requirement does not apply in this situation

Reference

 

1.8 Diving doctor (1 risk)

Risk

Not qualified and/ or incompetent diving doctor

Minimum control measure

A diving doctor B or a diving doctor A shall be in possession of a valid certificate which is applicable for the work he is going to perform, taking in consideration:
A diving doctor A is only allowed to carry our periodical (renewal) examination of professional divers
A diving doctor B is allowed to:
1. To carry out the initial examination (first examination) of professional divers
2. To carry out periodical (renewal) examination of professional divers
3. To provide medical support
4. To act as medical advisor

To the reference page.

Reference

AB: article 6.14 a paragraph 1 and paragraph 2
AB: article 6.14b
AB: article 6.15 paragraph 2
AR: Chapter 6 and Appendix XVIa

2. Number of personnel/ team size (2 risks)

Risk

Too small team to get a diver in distress out of a liquid and/ or to mobilise in an adequate manner external assistance

Minimum control measure

Minimum team size during diving is at all times in accordance with AB article 6.16 paragraph 1 (at least one diver, one standby diver and a diving supervisor). In case diving is carried out in the diving work Category A 2 + A 3 or Category B 1 - B4 no use may be of the deviation which is defined in AB article 6.16 paragraph 4. In case diving is carried out in the diving work Category A1  and use is made of the deviation in AB article 6.16 paragraph 4 the team shall be increased by at least one supporting team member (diving assistant)(See Personnel point 1.1)

 

Reference

 

Risk

Too small team to be able to execute the work in a safe manner

Minimum control measure

Team size is determined by the nature of the work, diving method and handling of potential emergency situations. Under the below mentioned circumstances there is a potential risk that the divers will get into difficulties, such as meant in AB article 6.16 paragraph 4:

- Standby diver cannot put on diving equipment by himself

- Poor visibility, namely: at less than 1 meter persons or objects are not clearly visible

- Impossibility to free ascend

- Presence of obstructions

- Entering hollow spaces

- Educating and training of divers

In case of Mining industry/ Energy generation related hyperbaric work the minimum team size is 5 persons (diving supervisor, diver, standby diver, diving assistant for the diver and a diving assistant for the standby diver)

Reference

 

3. Working periods/ times (1 risk)

Risk

Exhaustion and loss of concentration

Minimum control measure

Working in accordance with the ATW, in case of saturation diving in every 24 hours at least 12 hours uninterrupted rest for the diver

Bell runs may from disconnection from the system till connection to the system not take longer than 8 hours

A diver lock-out out of the bell may take a maximum of 6 hours

To the reference page.

References

ATW, DMAC D 020

4. Safety training (1 risk)

Risk

Insufficient knowledge and experience with regard to safe working

Minimum control measure

Sufficiently participating in safety trainings and practicing emergency procedures (See: Emergency Procedures and Contingencies) associated with the work

To the reference page.

Reference

VCA, BHV, EHBO, etc..


Medical

1. Medical equipment (1 risk)

Risk

Incorrect composition of medical equipment

Minimum control measure

1. Oxygen kit is a necessary element of the first aid equipment. The quantity of available oxygen must be sufficient for the travel time to the nearest recompression facility (See Emergency Procedures and Contingencies point 2.1) or the time it takes till arrival of professional medical assistance
2. For recreational divers the first aid equipment shall meet the requirements, which are specified by the “Nederlandse Onderwatersportbond” (NOB)

MAD-B
Saturation diving minimum medical equipment
1. At the diving location. Based on the guideline DMAC 15 and in consultation with the diving doctor B
2. In the diving bell. Based on the guideline DMAC 15 and in consultation with diving the doctor B
3. In the hyperbaric lifeboat. Based on the guideline DMAC 15 and in consultation with the diving doctor B
 
Provisions for medical treatment of divers in saturation
Provisions in the decompression chamber. Based on the guideline DMAC 28 and in consultation with the diving doctor B

To the reference page.

Reference

AB: article 6.15 paragraph 1d (First aid equipment)

DMAC 15

DMAC 28

2. Medical examination/ checks (4 risks)

Risk

Use of medication, alcohol use and use of hallucinogenic drugs

Minimum control measure

Notification by the diver

To the reference page.

Reference

AW: article 11 and AB: article 9.5

Risk

Physical condition

Minimum control measure

Notification by the diver

To the reference page.

References

AW: article 11 and AB: article 9.5

Risk

Mental condition

Minimum control measure

Notification by diver

To the reference page.

References

AW: article 11 and AB: article 9.5

Risk

No diver medical

Minimum control measure

1. Check diver logbook + notification by diver

2. The examination prior commencement working under hyperbaric conditions shall be carried out by a Diving Doctor B in a sufficiently equipped centre to carry all aspects of the examination. Periodical examinations may be carried out by a Diving Doctor A.
Following a diver illness such as decompression sickness, air embolism or a disorder mentioned as absolute contra-indication the medical examination shall take place by a doctor with a certificate Diving Doctor B.

Regarding to the medical examination for persons carrying out diving work, caisson work and other work under hyperbaric conditions the following applies:
A person who is required to carry out diving work, caisson work and other work under hyperbaric conditions:
- Shall without restrictions be able to carry out his work under hyperbaric conditions , under physical heavy circumstances be able to swim/ walk, communicate and be able to cope with the responsibility psychologically;
- may not endanger himself or another member of the team by a medical disorder during working under hyperbaric conditions such as loss of consciousness, loss of orientation or panic attack;
- may not have a disorder which as a result of working under hyperbaric conditions may worsen;
- may not have a disorder which may cause the development of a diver illness such as decompression illness or barotrauma.

At least the following aspects need to be examined:

    CI Assessment/Biometrics

1

Infectious diseases    
  in case untreated R  

2

Endocrine organs    
  diabetes mellitus A  

3

Psychological illnesses     
  Psycho syndromes and  psychotic disorders A  
  Claustrophobia A  

4

Nervous system   *baseline
  Episodes of  loss of consciousness, convulsions, loss of eyesight, loss of
muscular movement and/ or orientation
A Neurological status
*visus
  dizziness A  
  epilepsy A  

5

Tractus circulatorius   * ergometry
  Septal defects A  
  angina pectoris A  
  decompensation cordis A  
  myocardial  infarction A  
  arrhythmia R  
  hypertension R  

6

Tractus respiratorius   * 1e examination: X-thorax
  Air embolism A * lung function assessment
  COPD A  

7

Tractus digestivus    
  hiatus hemiae/ abominal hernia R  
  acute and/ or chronic hepatitis or pancreatitis A  
  haermorrhoids R  

8

Tractus urogenitalis   * urine assessment
  Disorders with abnormal kidney function A  

9

Ear-Nose-Throat   * tone audiogram
  chronic otitis media A  
  middle ear operations A  
  M. Ménière A  
  mastoiditis A  
  dental condition (loose
elements)
R  

10

Haematology   * complete
  thallassaemia major A Blood count incl. Hb, Ht and leucocytes
*glucose
*sickle cell
exclude on indication

11

Other disorders    
  malignancy R  
       
  CI (contra indication): A = absolute, R = relative (often till correction)
To the reference page.

References

AW: article 11 and AB: article 6.14

3. Liaison with a suitable doctor (1 risk)

Risk

Non-functioning means of communication

Minimum control measure

Appropriate means of communication in relation to the work location (inclusive back-up)

To the reference page.

References

 AB: article 6.15 paragraph 2

4. Medical and Physiological considerations

4. Medical and Physiological considerations

4.1 Diver checks (1 risk)

Risk

Failure to observe changes in the health status of the diver

Minimum control measure

Monitoring the health status of the diver. Possible ways are: video (ROV), voice communication and line signals. The RI&E will indicate which method must be used

Reference

 

4.2 Flying after diving (1 risk)

Risk

Contract a decompression sickness during flying after diving

Minimum control measure

Planning air travel in accordance with the requirements in the decompression tables being used

Reference

 

4.3 Duration saturation exposure (1 risk)

Risk

Chronic health problems

Minimum control measure

Duration saturation and atmospheric periods planning in consultation with the doctor involved

To the reference page.

Reference

DMAC 21 and ATW/ ATB for the Mining sector (agreement SODM)

4.4 Divers out of a closed diving bell (1 risk)

Risk

Dehydration

Minimum control measure

The diver shall be given sufficient opportunity to have a drink

To the reference page.

Reference

 

4.5 Diving medical risks (2 risks)

Risk

Primary diver sickness, secondary diver sickness, other disorders and decompression sickness

Minimum control measure

Diving medical aspects of diving as described in the textbook diving medical attendance for the relevant category of diving work, briefing, presence of a diving medial attendant/ diver medic and medical evacuation plan, contact means and options with diving doctor, presence of a First Aid kit

To the reference page.

Reference

AR: Appendix XVI a, c and d

 

Risk

Decompression sickness

Minimum control measure

Checking diver logbook + notification by diver (possibly recreational diving and diving at third parties) and use of decompression tables, presence of a decompression chamber in accordance with AB: article 6.18

To the reference page.

Reference

AW: article 11


Work planning

1. Risk Management Process (1 risk)

Risk

Not described or new risks which are not managed

Minimum control measure

Periodic re-evaluation of the available RI&E, execution of a specific RI&E for the diving project and the execution of a RI&E by the diving supervisor prior to the diving operation and in case of changed circumstances. (Think hereby about “management of change”)

To the reference page.

Reference

AW: article. 5

2. Operational and Safety Aspects

2. Operational and Safety Aspects

2.1 Diving depth ( 4 risks)

Risk

Not capable to remain at the desired water depth

Minimum control measure

A provision to allow the diver to remain at the desired waterdepth

Reference

Risk

Diving method/ category/ equipment unsuitable for the diving depth and or diving work

Minimum control measure

Comply with the limits in AR Appendix XVIc. Working in accordance the WOD-SOE (See also Duties, Responsibilities and Requirements point 1.5 and 1.6)

To the reference page.

Reference

AR: Appendix XVIc
WOD-SOE minimum system requirements

Risk

Use of incorrect decompression table

Minimum control measure

- Establish the diving depth
- Facilities in accordance with the WOD-SOE

To the reference page.

Reference

WOD-SOE minimum system requirements

Risk

Diving deeper than 50 metres

Minimum control measure

Carry out additional RI&E with explicit attention for: quantity available breathing gas in case of a failure of the primary breathing gas supply, the type of breathing gas used, decompression tables used in case of emergency.
(See also Duties, Responsibilities and Requirements point 1.5 and 1.6) 

In case of Mining industry/ Energy generation related work under hyperbaric conditions a closed diving bell in accordance WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements

2.2 Discharges (1 risk)

Risk

Contaminated water (thermal and/or chemical), uncontrolled “blowing away” of the diver

Minimum control measure

Closing of discharge or keep a safe distance, in case of pollution see Workplanning item 3.2

Reference

 

2.3 Intakes (1 risk)

Risk

Be sucked against the intake and or entrapment

Minimum control measure

Closing of inlet or keep a safe distance whereby the diving supervisor has control over the operation of the pump. Possibly make use of a work permit or “safe to dive certificate”

Reference

 

2.4 Diving near ROV operations (1 Risk)

Risk

Accidental contact with the ROV

Minimum control measure

Direct contact between diving supervisor and ROV supervisor

ROV video picture available to the diving supervisor

Thruster guards fitted to ROV thrusters

To the reference page.

Reference

AODC 032, IMCAD 045 and IMCA R 004

 

2.5 Safe use of electricity (1 risk)

Risk

Incur electrical shock

Minimum control measure

Approach a specialist for minimum control measure

To the reference page.

Reference

IMCA D 045 and IMCA R004

2.6 High pressure water jetting (1 risk)

Risk

Cuts of limbs and infection (dirty water)

Minimum control measure

Working with such a length of lance that the body cannot be hit by the water jet. When using a shorter length of lance working with two-handed activation

To the reference page.

Reference

Industrial Cleaning Foundation (SIR) Manual “High Pressure water jetting”

2.7 Lift bag (2 risks)

Risk

Uncontrolled ascent of the load and thereby dragging the diver along with it

Minimum control measure

Measures to prevent uncontrolled ascent, for example by anchoring the load, an automatic dump. Working in accordance with WOD-SOE

To the reference page.

Reference

IMCA D016

WOD-SOE Detail sheets

 

Risk

Following ascent again an uncontrolled descent of the load

Minimum control measure

Preferably make use of a closed lift bag

To the reference page.

Reference

IMCA D016

2.8 Cutting disks (1 risk)

Risk

Breaking and/or fragmentation during use (flying fragments)

Minimum control measure

Use of dry disks (not previously exposed to water)

Reference

 

2.9 Cutting and Burning (3 risks)

Risk

Explosion caused by accumulating gases

Minimum control measure

Take measures to ensure the direct discharge of gases/ prevent accumulation of gases (for example make preventive holes, working from top to bottom)

To the reference page.

Reference

MaTR133 (HSE UK)

IMCA D 003

OGP Report 471

Risk

Getting trapped underneath cut structural components

Minimum control measure

Make a cutting plan and securing of structural components which need to be cut

Reference

Risk

Cutting in body parts and/ or equipment

Minimum control measure

Adequate instruction, training, familiarisation

Reference

2.10 Diving from and/ or on DP vessels or floating structures (2 risks)

Risk

Unplanned loosing position resulting in an uncontrolled movement (horizontal or vertical) of the diver

Minimum control measure

In case of DP vessels at least an IMO equipment class 2, and working in accordance with IMCA D010.

In case of mechanical anchoring (spud poles, anchors and/ or ropes) an anchoring system such that the vessel remains stationary

To the reference page.

Reference

IMCA D010, IMO MSC/ Circ.645 Guidelines for vessels with dynamic positioning systems

 

Risk

Undesired contact between diver and propulsion units (such as: propellers, rudders, thrusters, jets)

Minimum control measure

Switching off and securing of propulsion units, in case of diving operations from DP vessels working in accordance with IMCA D010

Reference

 

2.11 Working with Oxygen enriched mixtures and Oxygen ( 2 risks)

Risk

Self ignition/ danger of explosion and can fuel a fire

Minimum control measure

The percentage of oxygen in a decompression chamber and other enclosed (accommodation-, living- or work) spaces shall not come above 25%

To the reference page.

Reference

WOD-SOE Minimum system requirements

Risk

Explosion risk

Minimum control measure

Equipment and materials to be oxygen cleaned when using 40% and higher, working in accordance WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements

 

2.12 Oxygen level in helium (1 risk)

Risk

Undesirable supply of pure helium to the diver

Minimum control measure

Helium storage cylinders shall contain a minimal oxygen percentage. Pure helium may only be available as calibration gas

To the reference page.

Reference

AODC 038

2.13 Length of the umbilical (4 risks)

Risk

Standby diver cannot reach diver in distress due to a too short umbilical

Minimum control measure

The umbilical of the standby diver must be of such a length that the standby diver can safely reach the diver

Reference

 

Risk

Insufficient reserve breathing gas in bail-out

Minimum control measure

Available quantity breathing gas to correspond with umbilical length. Working in accordance with WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements

 

Risk

Longer umbilical increases the chance of fouling/ snagging

Minimum control measure

Planning of the shortest possible route from the point of tendering of the umbilical to the work location (aim for a short as possible umbilical)

Reference

 

Risk

Longer umbilical makes reaching the diver by the standby diver more difficult

Minimum control measure

Planning of the shortest possible route from the point of tendering of the umbilical to the work location (aim for a short as possible umbilical)

Reference

 

2.14 Transfer under pressure (1 risk)

Risk

Undesirable pressure drop during connection system

Minimum control measure

Doors always to be kept closed, except when divers have to transfer

Reference

 

2.15 Underwater obstructions (2 risks)

Risk

Getting entangled

Minimum control measure

If possible and necessary removal, exploratory dive. Include in a specific Work plan. Consult available data regarding the diving location

Reference

 

Risk

Damage to diving equipment

Minimum control measure

If possible and necessary removal, exploratory dive. Include in a specific Work plan. Consult available data regarding the diving location

Reference

 

2.16 Lifting and scaffolding (1 risk)

Risk

Diver/ diving equipment is struck by falling/ moving objects and/ or become trapped

Minimum control measure

Scaffolding and lifting on platforms and work locations near diving work not simultaneously to take place

Physical separation of scaffolding, lifting- and diving work such that falling/ moving objects under no circumstances can hit/ trap a diver/ diving equipment

Reference

 

2.17 Diving in the vicinity of pipelines (3 risks)

Risk

Injury as a result of overpressure reactions (for example during testing or damage)

Minimum control measure

During testing divers have to be out of the vicinity of the pipeline. When working on damaged pipelines, pressure reduction

Reference

 

Risk

Injuries caused by heat

Minimum control measure

Keep sufficient distance

Reference

 

Risk

Diving in contaminated water (leakage of the contents)

Minimum control measure

See Work Planning 3.2

Reference

 

2.18 Diving on depressurised or empty pipelines, hoses and subsea constructions (1 risk)

Risk

Sucked against/Trapped by underpressure

Minimum control measure

If possible use a diffuser. Availability of pressure equalising measures (for example an emergency valve to quickly remove the underpressure)

Reference

 

2.19 Diving on wellheads and subsea facilities (2 risks)

Risk

Injury resulting from overpressure reactions

Minimum control measure

Putting in place safety barriers

Reference

 

Risk

Diving in contaminated water (leakage of the contents)

Minimum control measure

See Work Planning 3.2

Reference

 

2.20 Cathodic protection (1 risk)

Risk

Incurring electrical shock

Minimum control measure

Switching off system, subject to voltage and distance to the diver

To the reference page.

Reference

IMCA D 045

2.21 Diving near flare (1 risk)

Risk

Injury as a result of heat and fallout

Minimum control measure

In advance define the risk area and stay outside of it

Reference

 

2.22 Drilling- and injection fluids and construction materials such as concrete, clay, bentonite (2 risks)

Risk

Injury

Minimum control measure

Relevant and adequate risk assessment of the substance used to achieve an effective protection measure (such as appropriate protective clothing) (See Workplanning 3.2)

Reference

 

Risk

Damage to diving equipment

Minimum control measure

More intensive inspection of diving equipment, corrective and preventive maintenance

Reference

 

2.23 (Chain) hoists (1 risk)

Risk

Brake system failure resulting in uncontrolled load movement, with the risk of injury to the diver

Minimum control measure

Maintenance based on underwater use

To the reference page.

Reference

IMCA D 028

 

2.24 Seismic operations, sonar transmissions and piling (1 risk)

Risk

Injury

Minimum control measure

Seismic operations, sonar transmissions and piling operations not to be carried simultaneously with diving work or maintain minimum distances based on the (transmission) power being used

To the reference page.

Reference

DMAC 06 and DMAC 012

3. Considerations air, weather and sea conditions

3. Considerations air, weather and sea conditions

3.1 Underwater visibility (1 risk)

Risk

Poor visibility, insufficient overview of the work location

Minimum control measure

Specific work instruction

References

 

3.2 Air-, water- and soil pollution (1 risk)

Risk

Adverse health effects

Minimum control measure

Inspection in advance, specific work instruction, RI&E and clothing precautions, hereby attention for biological agents, hazardous substances and chemicals, not only for the diver but also for the other team members (think hereby about for example the diving bell (possibly equip with gas detection equipment), personnel on deck and ashore)

To the reference page.

Reference

IMCA D 021

3.3 Current/ tides (1 risk)

Risk

Adverse impact on reaching and staying at the work location

Minimum control measure

Include as a specific point of attention in the RI&E

Reference

 

3.4 Wave height (4 risks)

Risk

Influencing in water decompression

Minimum control measure

Working in accordance with the limits set out in the diving tables

Reference

 

Risk

Injury and or damage when getting in and out of the water by the diver

Minimum control measure

Description of the limit which is based on the equipment being used and the location where the diving takes place

Reference

 

Risk

Equipment moving on deck

Minimum control measure

Description of the limit which is based on the equipment being used and the location where the diving takes place

Reference

 

Risk

Influencing lifting work

Minimum control measure

Description of the limit which is based on the equipment being used and the location where the diving takes place

Reference

 

3.5 Weather conditions, Precipitation (1 risk), Wind (1 risk), Thunderstorm (1 risk), Darkness (1 risk), Reduced visibility (above water) (1 risk), Temperature (1 risk)

Risk

Precipitation; cold, humidity, slippery

Minimum control measure

Protective clothing

Reference

 

Risk

Wind, Wind chill; reduced stability of people and objects

Minimum control measure

Generic description of the limit which is based on the equipment being used and the location where the diving takes place

Reference

 

Risk

Thunderstorm; Lightning strike

Minimum control measure

Setting of a situation dependent limit regarding the minimum distance to the thunderstorm

Reference

 

Risk

Darkness; insufficient overview of the work location

Minimum control measure

Lighting

Reference

 

Risk

Reduced visibility (above water); insufficient overview of the work location

Minimum control measure

Setting of a limit, the work area of the diver must always be visible and in case of shipping set a situation dependant limit

Reference

 

Risk

Temperature; Hypothermia and overheating/ heat stroke

Minimum control measure

1. Specific work instruction regarding the work duration, clothing, shelter, climate controlled environment, diver and also other personnel

2. Ways to maintain the body temperature of the diver in thermal balance

Reference

 

3.6 Ice (2 risks)

Risk

Dysfunction of diving equipment as a result of freezing

Minimum control measure

In case of freezing discontinue diving operation, establish a specific work instruction

Reference

 

Risk

Ice formation resulting in increase of weight

Minimum control measure

(Support) equipment must be designed for ice formation

Reference

 

3.7 Hazardous Marine Life (1 risk)

Risk

Personal injury

Minimum control measure

Protective clothing and a specific work instruction

Reference

 

4. Communications

4. Communications

4.1 Communication with third parties/ bystanders, such as shipping, deck personnel, operators, crane drivers (1 risk)

Risk

Cause of dangerous situations such as: collision, being run down, falling loads, getting trapped, be sucked against or getting stuck, etc.

Minimum control measure

In advance agree communication and remain in contact with third parties/ bystanders, marking of dive location and show the prescribed signals

Reference

 

4.2 Miscommunication (1 risk)

Risk

Uncertainty about instructions diving supervisor versus diver

Minimum control measure

In advance agreement on the language to be used. Recording of communication procedure in the work instruction

Reference

 

5. Diving from vessels, fixed platforms or floating installations (1 risk)

Risk

Vessels used on an ad-hoc basis, fixed platforms and floating structures not optimal set up for the safe execution of diving work

Minimum control measure

Performing an additional risk-inventory when diving from non-purpose built diving vessels, fixed platforms or floating structures. This is specifically to establish the limitations regarding execution of diving operations from the above mentioned work locations

To the reference page.

Reference

IMCA D014, Section 7.6

6. Diving from a vessel under power and making way (1 risk)

Risk

Suffer injury, as a result of rotating/ moving parts of the vessel

Minimum control measure

Diving from vessels making way shall be avoided. See also Work Planning 2.9

Reference

 


Emergency Procedures and Contingencies

1. Diving emergencies

1. Diving emergencies

1.1 Loss of communications (1 risk)

Risk

Increased risk of accidents

Minimum control measure

Abort the dive. Working conform WOD-SOE

To the reference page.

Reference

WOD-SOE Minimum system requirements

1.2 Diver in distress (1 risk)

Risk

Increased risk of personal injury

Minimum control measure

Abort the dive, provide assistance including deployment of the standby diver and implementation of the agreed emergency procedure

Reference

 

1.3 Dealing with an injured or unconscious diver (1 risk)

Risk

Risk of (additional) injury, drowning

Minimum control measure

Inclusion of this emergency procedure in the Work instruction

Reference

 

1.4 Non-functioning or defective equipment (1 risk)

Risk

Increased risk of accidents and personal injury

Minimum control measure

Abort the dive and implement agreed emergency procedure

Reference

 

1.5 Fire in and/ or around the compression chamber or the compression facility (1 risk)

Risk

Injury, decompression sickness

Minimum control measure

Compression chamber in accordance with the requirements in the WOD-SOE, fire fighting procedures and procedures which explicitly focus on dealing with forced decompression because of an evacuation

To the reference page.

Reference

 WOD-SOE Minimum system requirements

2. Dry diving bell of which the lifting wires and/ or umbilical are damaged/ severed (1 risk)

Risk

Death of divers

Minimum control measure

Work in accordance with the WOD-SOE. Execute emergency procedure to locate the diving bell and to save the divers

To the reference page.

Reference

WOD-SOE

- Minimum system requirements

- Detail sheets

- IMCA D014 section 9

3. Habitat/ underwater dry working space (1 risk)

Risk

Death of divers

Minimum control measure

Procedures and provisions for survival in the habitat of trapped divers for at least 48 hours.

Procedures to rescue divers out of the habitat within 48 hours.

To the reference page.

Reference

 IMCA D 014 section 9

4. Hyperbaric Evacuation divers from a saturation system because of an emergency situation such as fire or sinking ship/platform

4. Hyperbaric Evacuation divers from a saturation system because of an emergency situation such as fire or sinking ship/ platform

4.1 Evacuation of Saturation divers with an hyperbaric evacuation system (1 risk)

Risk

Contract decompression sickness

Death of divers

Minimum control measure

Have at least available:

1. evacuation procedures

2. procedure and resources to complete the decompression after evacuation in a safe manner

3. a “hyperbaric evacuation system” HES conform guidelines and specifications for hyperbaric evacuation systems of IMO, IMCA guidelines and WOD-SOE

To the reference page.

Reference

IMO resolution A.692 (17)

WOD-SOE Minimum system requirements

IMCA D 051

IMCA D 052

IMCA D 014 section 8

5. Diving contractor contingency centre (1 risk)

Risk

Inability to deal adequately with emergencies which may occur

Minimum control measure

The availability of a room equipped with sufficient communication facilities, relevant documentation and other necessary facilities for the supporting/ coordinating team that is called out in case of an emergency.

Reference