Interior pipeline coating process

Patent · Tue Jul 27 04:00:00 EDT 1993

OSTI ID:6369244

Munde, B A

An in situ method is described of repairing an extending subsurfaced pipeline having a corroded interior surface and first and second opposite ends, the method comprising the steps of: cleaning and treating the interior surface to prepare it for application thereto of a corrosion protective and reinforcing coating; providing a first quantity of corrosion protective and reinforcing coating material sufficient to entirely coat the cleaned interior surface with a first layer having a predetermined thickness and to fill corrosion depressions in the interior surface, the protective and reinforcing coating material being a 100% solid, high viscosity, solvent-free epoxy coating material; providing and positioning the leading and trailing extruder pig members in a spaced apart relationship in the extended pipeline; placing the quantity of corrosion protective and reinforcing coating material between the extruder pig members; utilizing pressurized air to propel the pig members, and the corrosion protective and reinforcing coating material positioned therebetween, through the pipeline, causing the coating material between the pigs to alternatively shift between axial and circumferential flow through offset passages in the trailing extruder pig member to mix the coating material, prior to discharge of the coating material past the trailing extruder pig member; flowing dehydrated air through the extended pipeline to cure the first layer of the corrosion protective and reinforcing coating material; and passing the leading and trailing pig members, and at least one additional quantity of the corrosion protective and reinforcing coating material through the pipeline again, to form on the first protective and reinforcing layer at least one additional protective and reinforcing layer defining therewith a multi-layer coating of sufficient thickness to provide a substantial measure of internal structural reinforcement to the extended subsurfaced pipeline through its length.

• Assignee: IMS; EDB-93-111977
• Patent Number(s): US 5230842; A
• Application Number: PPN: US 7-771786
• OSTI ID: 6369244
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
CHEMICAL REACTIONS
CLEANING
COATINGS
COMPRESSED GASES
CORROSION
CORROSION PRODUCTS
CORROSION PROTECTION
CURING
DEPOSITION
DESIGN
EPOXIDES
EXTRUSION
FABRICATION
FLUIDS
GASES
LAYERS
MAINTENANCE FACILITIES
MASS TRANSFER
MATERIALS
MATERIALS WORKING
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PIPELINES
PITTING CORROSION
REINFORCED MATERIALS
REMOVAL
REPAIR
SURFACE COATING