Riser joints form the heart of any offshore drilling programme. They connect the subsea oil well to the drilling rig via the subsea equipment known as the Christmas tree. These high value components are 40 feet long and have a main bore, usually 12”-14” in diameter and a number of small bore pipes attached to the outside for control fluids for the well.
Fabricated out of carbon steel, risers are prone to corrosion when they are not in use, either stored onboard the drilling unit or stored in a yard.
Presserv are specialists in delivering Riser Preservation Programmes, this includes riser cleaning using our “Black Boar” proprietary riser cleaning tool that eliminates the use of water and reduces the mess and clear up costs.
Our Preservation Teams utilise Cortec VpCI-337, waterborne vapour corrosion inhibitor for up to 2-years internal corrosion protection for the main and small bores.
Cortec VpCI-368, wax coating is applied to flange faces and critical components to avoid corrosion caused by salt laden moist air.
Finally the risers are capped off either with plastic end caps or shrink wrapped using Cortec VpCI MilCorr or 126 HPUV shrink wrap.
The above project was delivered by Presserv in the Canary Islands on 250 riser joints heading to a deepwater drilling project in Brazil.
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