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Customer
Stolt
Comex Seaway S.A.
Product/Service
DIAJET Limited designed and supplied 350 bar and 700 bar suspension abrasive
water jetting units for offshore decommissioning applications.
Problem
The successful removal of offshore structures needs effective subsea
technology. Amongst the most challenging of tasks is the cutting of multi-string
casings. These casing can be up to 30 inch in diameter and need to be
severed below the seabed. Techniques for cutting inside the casing are
explosives and abrasive water jetting. Explosives can cause damage to
the piles and have environmental disadvantages. Also it is not permissable
in all territorial waters.
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Objectives
To apply DIAJET technology for pipe and multi-string casing cutting
with these capabilities:
- Remote ability
with hose lengths 100's of metre's
- Cut hundreds
of meters under water
- Single hose delivery
for confined access and manoeuvrability
- Precise cold
cutting
- Low cutting head
mass and reaction forces
Approach
DIAJET has supplied high powered abrasive water jetting systems
for a number of decommissioning applications including leg piles of
42" diameter and internal multi-pass rotary cuts of casings.
Together with DIAJET, Stolt Comex Seaway has developed a Jet Abrasive
Clamp (JAC) that has been deployed to cut submerged pipelines.
Outcome
DIAJET technology has been proven as an effective and flexible method
of decommissioning structures remotely and underwater at a great depth.
For more
details, or to discuss your case, please contact
us.
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