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Welding

WELDING

Flowline Alaska is equipped to provide both pipe and structural steel fabrication for a variety of applications. A large majority of the fabrication work we produce includes pipe spooling, pipe double joint welding, and associated piping supports and structural steel assemblies common to the piping industry. We have provided pipe fabrications from 3/4" diameter to 60" diameters in a variety of material grades up to 2" in thickness. Flowline utilizes a number of welding processes and equipment for both manual and state-of-the-art semi-automatic welding that can be applied to the welding of carbon steels, corrosion resistant alloys and high density polyethylene materials. Welding processes currently used by Flowline include: SMAW (Shielded Metal Arc Welding), FCAW (Flux Core Arc Welding), GTAW (Gas Tungsten Arc Welding), GMAW (Gas Metal Arc Welding), SAW (Submerged Arc Welding), STT (Surface Tension Transfer), and HDPE Fusion (High Density Polyethylene Fusion).

All fabrication work is conducted by qualified welders working to client approved procedures qualified under ASME, API and AWS Code requirements. We employ certified welding inspectors and a third party NDE Inspection company with the capabilities of VT (Visual), RT (Radiographic), UT (Ultrasonic), PT (Penetrant), and MT (Mag Particle) testing to monitor and document the quality of work we perform. Post weld heat treatment processes are also available.

SPOOL FABRICATION

Flowline staffs a full time Engineering, AutoCAD and materials department to support the welding fabrication operations. Client provided isometric drawings are translated into “truckable” pipe spool shop drawings for fabrication in our facility. We can build “on-pad” and “cross country” pipeline spools up to 80’ in length. Typically pipe and fittings are provided by the client for project specific fabrication. Our spool fabrications are nicely complimented with the corrosion coating and spool insulation services we also provide. These additional capabilities allow us to create “turn-key” spools for field installation.

DOUBLE JOINTS

Flowline’s double jointing facility is state of the art, with the ability to implement Surface Tension Transfer (STT-GMAW), Submerged Arc (SAW) and Flux Core (FCAW) welding processes. Located immediately adjacent to a rail spur, this allows for easy offloading of client supplied pipe for double jointing into 80 foot lengths prior to application of our corrosion coatings, insulation and cross country spool fabrication. The double jointing work scope conveniently reduces the number of cost prohibitive North Slope field installation welds, in addition to reducing the number of field applied coating and insulation weld packs which have historically been initiation points for external corrosion.

DOWNHOLE CASINGS

Flowline has fabricated and insulated a number of 80’ long downhole well casings (conductors) and pump caissons (up to 130’ in length) which are comprised of a pipe-within-a-pipe geometry with an insulated annulus. The casings are typically supplied for well pads that have a number of wells in close proximity that may require a thermal barrier to eliminate any thaw type phenomena that can take place within a gravel well pad located in an arctic climate.

ROAD CROSSINGS

Flowline has an extensive history in manufacturing turn-key road crossing assemblies for the North Slope Oil fields. Road crossings are fabricated to include the inner carrier pipe that is built into the outer casing pipe. The pipe system is fabricated, hydrotested, coated and insulated with casing spacers. A number of various geometries have been fabricated dependent upon client needs. The turn-key road crossing assembly lends itself to ease of installation by a single crane pick/placement into a pre-trenched road crossing that can be immediately backfilled. Flowline has provided and shipped road crossing assemblies up to 125’ in length and 15’ in width.

VSM’s

Flowline performs double jointing and splicing activities for pipeline VSM fabrication. VSM fabrication is conducted to the AWS D1.1 Welding Code. Flowline’s on site rail spurs lend to the convenience of shipping bulk VSM pipe quantities.

PRESSURE TESTING

Flowline has the ability to pressure test piping systems to client provided specifications prior to shipment. Hydrostatic tests are typically performed in our climate controlled shop environment with clean potable water. Large volume testing can be conducted within Flowline’s fabrication yard. Low Pressure pneumatic testing can also be performed with clean dry compressed air if approved by client provided specifications. Shop pressure tests lend themselves to the convenience of eliminating cost prohibitive pressure tests that are required to be conducted at the remote installation site.

FINAL DOCUMENTATION & TRACEABILITY

Each project is completely documented from the receipt of materials to the final shipment of fabrication. At the end of each project a full set of records for the services we applied to owner supplied pipe and fittings are provided to our clients. Through this documentation traceability of materials is easily pinpointed.

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