JSA Underwater Welding

No.

Job steps

Hazards

Possible impact

Control measures 

All diving personnel adequately trained (PDS)

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All vessel relevant personnel adequately briefed (PDS) Only competent & experienced personnel to do cutting (PDS) Tool Box Talk- make sure the following have been considered (as applicable) (PDS): Material to be cut is under tension? Are there any pockets that could hold unburned gases? Can vent holes be cut? Have the vent holes been cut? Are there any flammable/ explosive materials/ substances adjacent to the worksite? Is any protection for installations or fittings required? Are protective rubber sheets in place to prevent accidental arcing? Does the diver/ burner have a steady platform to work from? Are sea state and visibility adequate for work? Are any additional precautions necessary? If yes, please list them at the end of this JSA. Ensure work permit is in place (PDS) Make sure all equipment certificates are in date (PDS) Make sure the welding checklist have been reviewed and all items checked OK (operator) Use sufficient personnel and follow safe lifting procedure (PDS) Ensure welding machine is in D.C. current mode only. Check all leads and connections for good condition. Check knife switch is tested! (operator) Follow safe use of electrical equipment procedure (operator) Ensure good housekeeping techniques are always in use (PDS)

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Muscular-skeletal disorders (IN, IH) Incorrect manual handling practices (N,A,E) Electrical Shock (E)

1.

Pre Deployment Set up and test Slipping and falling (N,A,E) welding Kit

Explosive materials within 500m zone of installations (N,A,E) Fire/ Explosion (E)

Flash burn to eyes/limbs (IN, IH)

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Burns, injury, death (IN) Property Loss (PL) Damage to equipment (PL) Water pollution (WP) Effects on flora/fauna (FF) Air Pollution (AP) Delay in Operation (PL)

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2.

Deployment/ Recovery

Incorrect manual handling practices Muscular-skeletal disorders (IN, IH) (N,A,E) Burns, injury, death (IN) Breakage of cutting rig hose (N,A,E) Property Loss (PL) Fouling the diver (N,A,E) Damage to equipment (PL) Entangling other subsea equipment (N,A,E) Water pollution (WP) Man overboard (E)

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NO TESTING (welding) IS TO TAKE PLACE WITHIN 500m ZONE (PDS)exceptions only with platform approval

 

Ensure correct usage of hoses & fittings (operator) Use correct PPE: surface & diving personnel – as per above (operator)

      

All diving personnel adequately trained (PDS) All vessel relevant personnel adequately briefed (PDS) Only competent & experienced personnel to do cutting (PDS) Tool Box Talk (PDS) Ensure work permit is in place (PDS) Make sure all equipment certificates are in date (PDS) Make sure the BROCO set-up & Underwater welding checklists have been reviewed and all items checked OK (operator) Use sufficient personnel and follow safe lifting procedure (PDS) Ensure weight of hose supported by adequate ties to lowering wire / equipment (operator) Do not lower the welding torch before the ground clamp is securely attached near the work area (PDS/ operator) Lower power tools to the diver upon request (PDS) Ensure that power tools are de-energized before they are placed in or

Effects on flora/fauna (FF)

 

Air Pollution (AP)



Delay in Operation (PL)

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Contingency

 Contingency planning (PM)  Emergency response plans  Emergency materials and equipment inspected and certified – as applicable (VO; PDS)  Hospital on board (VO)  Contract with hyperbaric medical facility; hyperbaric medic on-call (PM)  Decontamination procedures (PDS)

 Contingency planning (PM)  Emergency response plans  Emergency materials and equipment inspected and certified – as applicable (VO; PDS)  Hospital on board (VO)  Contract with hyperbaric medical facility; hyperbaric medic on-call (PM)  Decontamination procedures (PDS)

Limb/torso/head/internal injury due to fall (IN)

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Limb/torso/head/internal organs injury during recovery (IN) Incorrect manual handling practices (N,A,E) Breakage of cutting rig hose (N,A,E) Fouling the diver (N,A,E)

3.

Operating

Muscular-skeletal disorders (IN, IH) Burns, injury, death (IN) Property Loss (PL) Damage to equipment (PL)

Electrolysis due to improper Water pollution (WP) placement of earth clamp relative to Diver/ job (N,A,E) Effects on flora/fauna (FF) Hydrogen build up creating explosive situation (E)

Air Pollution (AP) Delay in Operation (PL)

 

retrieved from the water (PDS) Divers clear of the downline position (diver) Use correct PPE: surface & diving personnel – as per above (operator)

 No welding is to be performed without an operating diver hat camera and video recording system with diver/supervisor voice over (PDS)  Proper umbilical management and diver awareness (PDS/ diver)  Diver positional awareness, ensure diver not between earth clamp and job (PDS/ diver)  Flush torch with oxygen prior to making hot (PDS/ diver)  Ensure after cutting Oxygen window at 12 O’clock that lower part of pipe is cut first. (PDS/ diver)  Ensure umbilicals always clear (PDS/ diver)  Closer supervision & double-checking before final (PDS/ diver)  Correctly identify area to be cut. (PDS/ diver)  Stop work authority (all)  PDS to review with diver/ welder the check list below immediately before welding (PDS/ diver)  Use correct PPE: surface & diving personnel – as per above (operator)

 Contingency planning (PM)  Emergency response plans  Emergency materials and equipment inspected and certified – as applicable (VO; PDS)  Hospital on board (VO)  Contract with hyperbaric medical facility; hyperbaric medic on-call (PM)  Decontamination procedures (PDS)

MANDATORY MEASURES BEFORE PERFORMING ANY WELDING: Next table to be read out by supervisor to diver, immediately before welding:

1.

2. 3. 4. 5. 6. 7. 8.

9.

TASK Diver and supervisor have both read and understood the welding task plan and the relevant risk assessment. The diver has adequate PPE/ work equipment- hard hat, visor/shield, rubber gloves, drysuit - according to applicable requirements. The diver is placed securely, comfortably and must ensure that he is not between the torch and the earth clamp or standing in a bight of cable. Ensure that the diver checks above him to see that there are no pockets where gases might collect and ignite. Note gases may also collect in mud and under certain conditions the mud may already contain methane, another inflammable gas. Diver must check to ensure that no molten slag or cut offs will drop onto him, his umbilical or other equipment. Welding area must be properly prepared, skimmed and grinded. Never turn the power on unless the diver asks for it and is ready to start welding immediately. Ensure that the diver never has the power on when he is changing electrodes, when he leaves the worksite, returns to the basket or comes to the surface.

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