Professional Subsea Service presentation describing underwater wet welding technique

2. Professional Subsea Service - professional diving service company, which operates
over 20 years. We specialize in performing various subsea technical and civil
engineering on oil platforms, pipelines, vessels, shore and offshore facilities.
Using equipment of leading world manufacturers, our company monitors
compliance with safe working conditions during performing underwater
operations, following the idea of preserving and maintaining international
standards of safety and environmental protection, no matter where activity was
performed.
Subsea wet welding is our priority area. Divers and welding technicians are trained,
certified and able to weld in all positions including 6G.
About PSS ltd.

3. Wet underwater welding directly exposes the diver and electrode to the water and
surrounding elements.
The electric arc heats the workpiece and the welding rod, and the molten metal is
transferred through the gas bubble around the arc. Current flow induces transfer
of metal droplets from the electrode to the workpiece and enables positional
welding by a skilled operator.
Our company executed totally more then 2100 meters of weld joint in 2F, 3F, 4F,
1G, 2G, 3G positions.
Wet welding.

6. Weld joint example
V-groove joint, 1G position, 10m. depth, St20 (A 105 Gr1)

7. Tensile strength test results
Base material: St20 (A 105 Gr1);
Welding electrode: Broco SoftTouch
Welding depth:10 meters
Position of fracture Weld joint and heat affected zone

8. Wet vs Dry underwater welding
Wet welding Dry (Hyperbaric) welding
Advantages Advantages
Less expensive and fastest method Surface quality welds
Increased tensile strength Advanced NDT
Ease of access the welding point
No habitat, no construction, no waste of time
Disadvantages Disadvantages
Decreased ductility and impact strength Large quantity of costly and complex equipment
Limited NDT (VT, ACFM and MPI only) Very high cost and long preparation
More deep – more energy requirements
Weld spot position limitation

9. Wet welding world experience
Location Activity Year Status
Garden Banks 426 Tubes installation 1998-2003 Still in service
Mississippi Canyon
(807,809)
Complex upgrade 2006-2008 Still in service
Ship shoal (169A, 207A, 291A,
246A, 269A)
Repairing works 1993-2005 Still in service
(except 169A)
South Timbalier (52, 21E, 134W,
135M, 151, 151L, 185A, 188CA)
Elements replacement and
repairing works
1993-1998 Still in service
(except 151L)
Main pass (313A, 281A, 288A) Leg, brace and conductor repairing
works
1985-2006 Still in service
Khazzan 2 and 3, Arabian Gulf Structural tee and anodes repairing
works
1972 Still in service
Montrose, Central North sea Brace repairing works 1990 Still in service
Explicate list of wet welding projects you can find in this document.

10. Our projects
Lam-22 offshore platform reconstruction,
anodes welding.
Years: 1999-2014
Location: Caspian sea, Turkmenistan
Welding positions: 2F, 3F, 3G
About 600 meters of weld joint
TP-1 offshore platform. Installation of
new nodes by underwater welding.
Installation of electrochemical protection
system by underwater welding.
Years: 2001, 2003
Location: Black sea, Ukraine
Welding positions: 1G, 2G
About 200 meters of weld joint

11. Podolsky bridge building. Underwater welding of metal structures.
Years: 2005-2009
Location: Dnipro river, Ukraine
Welding positions: 2F, 3G, 4F
More then 1300 meters of weld joint.
Our projects

12. Welders certification (6G)
In 2003, our welders were certified
by the classification community
BUERAU VERITAS and annually
confirm their qualifications.
In 2013, the international
classification community DET
NORSKE VERITAS certified two
divers-welders for the most difficult
welding position - 6G (according to
the international welding standard
AWS D 3.6 M 2010).
Our underwater welders carry out
daily training at our base.

13. Thank you!
More information:
www.pss-offshore.com
Contact us:
info@pss-offshore.com