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ADCI Industry Informational Update #2010-08
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May/2010
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TO: ADCI General Membership and Industry
Stakeholders
The following items of information are provided to
bring your attention to recent industry developments,
initiatives, or safety notices. The below
recommneded guidelines are from the draft of the
upcoming 6th edition of the ADCI International Consensus
Standards for Commercial Diving and Underwater
Operations.
If you do not wish to receive future Industry
Updates, please use the unsubscribe option, located at the bottom
of this update.
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Simultaneous
ROV - Diver Operations
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9.3.3 MULTI-ROV AND MULTI-DIVER TEAM
COMMUNICATION
IS KEY TO A SAFE AND EFFICIENT OPERATIONS
9.3.3.1 Pre-Dives
In addition to standard pre-dive briefings:
·
It is important that all divers and dive supervisors are
familiarized with the ROV.
·
Location of thrusters, diver toolbox, manipulator arms, tether and
camera locations will all be pointed out to diving personnel during
this orientation.
·
Camera location is important in order to emphasize to diving
personnel pilots field of vision.
·
Tether is not to be used as a cross-over/swim line for divers.
·
When mounting a diver toolbox on ROV, place it in a location that
takes into consideration that most diving tools have lanyards on
them. The diver needs to be able to access the toolbox and tools
without getting lanyards or the divers themselves fouled in
thrusters.
·
Thruster location is important to divers. Divers will have
pneumos and tooling with lanyards. Even with thrusters nulled and
pilot holding a dead stick, thrusters will rotate. Divers need to
secure all lanyards and pneumo hoses before approaching an
ROV.
9.3.3.2 Subsea Operations
·
Before the ROV approaches a diver, the Diving Supervisor must be
notified. Slow easy movements are required to prevent injury to
diver.
·
When the diver approaches the ROV, the Diving Supervisor must be
notified as well as ROV Supervisor or Pilot. ROV should stop all
movements in order to allow diver to approach. When possible, diver
should approach from the front of the ROV, to allow the ROV pilot
to view him. If the ROV needs to dial in vertical thrust down, in
order to hold position, the pilot should notify the Dive Supervisor
that the thrusters are operating during diver's approach.
·
Using manipulators with divers:
-
ROV should place manipulator in such a position that diver can
place tool in jaws.
-
ROV pilot should then inform the Diving Supervisor that the
manipulator jaw
is closing. Once this is acknowledged only then does ROV close
jaws.
-
ROV should never try to take a tool from diver; diver must place in
manipulator jaws to minimize manipulator movements.
·
ROV tether should never be used for a diver
cross-over/swim-line.
·
When establishing a swim line for a diver:
-
After the ROV has acquired the hook for the crossover line, the
diver should pay out the crossover line as ROV flies to connection
point.
-
Diver should not let out excessive amounts of line during this
operation. Line should be kept taut; if pilot requires additional
slack he can then notify Dive Supervisor.
-
After crossover line is established, the diver should secure so
that excessive slack is not floating about for ROV to get tangled
in thrusters.
·
Tag lines should be cut short or made ROV friendly from
surface. ROV friendly tag lines are ones that are removable
from surface, after tag lines have served their purpose, in
over-boarding equipment. If the diver is required to cut tag lines,
the pieces cut off should be tied to a retrieval shackle, on down
line. The cut off pieces should then be recovered to surface for
disposal, to mitigate the possibility of fouling ROV thrusters with
rope floating about subsea.
·
As stated earlier, the diver should not use the tether as a
crossover line. The Diver should also try to go under the ROV
tether. This will help prevent any entanglement problems with the
diver, should the ROV lose hydraulics.
·
If the ROV is in a no-visibility situation:
- The
Diver should return to the stage or bell, if the ROV needs to
perform tasks. If the ROV is not needed and the diver is
required to stay on location, the ROV should go dead stick. The
pilot should then inform the Dive Supervisor that the ROV is in a no-visibility
situation and should remain clear from the diver. The ROV pilot
should allow the ROV to rise above no-visibility to an area where
visibility can be obtained. The ROV should not for any reason be
flying in a no-visibility situation with diver in area.
·
The ROV pilot should be aware of all lines in water. There will
usually be at least one down line, running from the surface to the
diver work location. Additionally, one or more crossover lines
will also be present. This crossover line will run from the
stage or bell (when applicable) to the work location.
9.3.3.3 Multi-ROV
and Multi-Diver Intervention
· During multi-ROV/multi-Diver operations, the ROV
should answer to the designated call sign of that system, (i.e.
XL19, XL16, Quest, etc). No generic "ROV" communication
should be used over radio.
·
Dive teams should be referred to as designated teams, (i.e. shallow
team, deep team, manifold team, etc.
·
It is recommended that Dive teams be divided/assigned to particular
ROV's.
·
When assigning ROV's/Divers, the following will be taken into
consideration:
- Launch point of
ROV,
- Deployment point
of dive teams,
- Task at
hand,
- Routing of ROV
tethers and diver umbilical.
·
Field of operations should be assigned to each ROV/Dive team. The
ROV's should then work within these areas during operations. If at any
time the ROV is required to leave the established fields of
operation, both the ROV and Diving Supervisors should be notified,
to make necessary changes. Both supervisors should insure all
dive and ROV members are aware of any ROV entering designated work
area.
·
All communications over the radio should be acknowledged and
repeated for verification, prior to any task being carried
out.
9.3.3.4 Surface Navigation-Survey Crew
The survey (tracking of the ROV) should, in certain
instances should be handled by a third party contractor. In
this case, the ROV crews should have to rely upon the survey crew
extensively during the course of any multi-ROV operation. Good
clear communication is critical between these two crews. The
following recommended guidelines will cover some of the steps that
should be established for the successful interface between the two
crews.
· The
ROV crews should run video and communication lines between the ROV
control vans and the survey control van. The two crews should be in
constant communication during any and all dives.
· The
survey crew should run computer video lines to the ROV control
vans, and place a monitor in each ROV control van to provide
tracking information. The screen on the navigation monitor
should display the surface support vessel, the ROV and any subsea
structures in the area, etc. This should assist the ROV Pilots in
navigating the ROV to, from, and around the scope of operation.
· The
tracking of the ROV is established by the use of the following
equipment:
- ROV's should be tracked by using
the LBL or USBL modes. In the LBL mode the ROV should have a
Mini ROV NAV system installed. If in USBL mode the ROV should
have a mini beacon installed.
-
A navigation monitor should also be placed in the
bridge of the surface support vessel. This should enable the
captain of the vessel to track the ROV movements and keep the
surface vessel in the desired position, during ROV operations.
9.3.4 PRE-DIVE
PROCEDURE
1. Verify sea state conditions are safe to
dive.
2. Inform Client Representative, Survey
and Vessel Captain of intent to dive.
3. Verify all cables are secured and clear
from entanglement.
4. Verify all static compensators are full
and bled of air.
5. Verify all hydraulic compensators are
full and bled of air.
6. Inspect system cursor (if applicable).
7. Verify ground strap is attached.
8. Verify good communications from control
van to winch/LARS area.
9. Verify with other ROV's the intent to
conduct deck checks.
10. Turn on power to TMS; verify TMS hydraulic
pressure (if applicable), communications (if applicable) and that
current draw is not excessive.
11. Calibrate Pan and Tilt system. (If applicable)
12. Verify TMS tether in and tether out
functions properly.
13. Verify TMS latch and unlatch functions
properly.
14. Turn off power to TMS HPU. (If applicable)
15. Turn on instrument power; verify telemetry
indicators are good. (If applicable)
16. Ensure that the gyro is operational and in
the slave setting. (If applicable)
17. Verify all GFD values are at acceptable
values.
18. Turn on all cameras; verify quality video is
received, test-operate all VCR's, re-install SIT cover.
19. Enable light power; verify all lights are
variably controlled through controls. (If applicable).
20. Turn on sonar power, verify sonar passes
self-test and telemetry is established.
21. Turn on altimeter power and verify reading.
22. Turn on power to "function"
manipulator and verify valid telemetry.
23.
Verify all personnel are clear of ROV area.
24.
Turn on ROV HPU (verify that hydraulic pressure and current draw
are not excessive).
25.
Test any and all ancillary tooling with Client Rep in attendance if
required.
26.
Turn on all Survey and Tracking devices.
27.
Verify proper pressures on compensators and system pressure gauges.
28.
Verify clearance of operation and speed of pan and tilt units.
29. Verify
proper operation and speed of 5-function manipulator.
30.
Verify proper rotation of thrusters and that no excessive noise is
heard.
31.
Shut down HPU. (If applicable)
32.
Turn on RF beacon and test the receiver.
33.
Turn on the emergency flasher.
34. Remove SIT camera cover.
35.
Remove ground strap.
36.
Launch ROV.
37.
Enter launch time, dive number and task in Operations log book
9.3.5 POST DIVE PROCEDURE
1.
Turn off power and attach ground strap to the ROV.
2.
Install all camera covers. (It is very important to ensure
the SIT camera cover is installed.)
3.
Turn off emergency flasher.
4.
Turn off emergency RF beacon.
5.
Wash down system with fresh water.
6.
Visually inspect ROV and TMS for damage and debris.
7.
Inspect thrusters for damage, debris or excessive wear.
8.
Check and fill all compensators and bleed off air.
9.
Inspect umbilical at the top of the mushroom for signs of wear.
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This Information was
sent to further the communication of all industry
stakeholders. Safety is the primary concern of the
ADCI. Remember: a real-time Job Safety Analysis is
important, but nothing can replace good common sense.
Phil Newsum
Association
of Diving Contractors International
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