Field Welding of CRA Pipelines

T-Head Punj LloydMany gas fields contain dangerous levels of hydrogen sulfide gas – odorless, colorless, toxic and corrosive.  The Shah gas reservoir in Abu Dhabi contains 23% of the gas, as well as 10% CO2 requiring corrosion resistant piping from the well head to a processing facility.

One solution to transporting so called “sour” gas is to use standard steel piping internally lined with a corrosion resistant alloy (CRA).  This is usually Inconel 625 alloy (NiCrMo-3).  The pipe can be lined with a tube of this material which is inserted into the id and mechanically expanded.  Alternately, the id can be clad with a weld overlay.

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Orbital Welding Shell’s Quest Project “Green” Pipeline

shell 2The Athabasca Oil Sands Project (AOSP) is a joint venture between majority owner Shell Canada, Chevron Canada, and Marathon Oil Canada Corporation.  AOSP operates two mines.  No processing is done at the mines and the bitumen is transported in a diluted form by pipeline to the Scotford upgrader facility located 50 km northeast of Edmonton, Alberta.  The Scotford upgrader currently produces 255,000 barrels per day of synthetic crude.  This currently meets 10% of Canada’s requirements.

The proposed Keystone XL pipeline, to transport Alberta oil down to refineries on the Gulf of Mexico ignited a firestorm of controversy, and it was eventually blocked by President Obama.  Critics claim it encourages the use of “dirty” oil.  (Until recently, Canadian oil supplied 17% of US demand, the tar sands have been actively mined since the mid-60’s.)  The critics have several complaints, but a significant fact is that in “upgrading” the bitumen, large quantities of CO2 are generated.

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ID Welders Delivered

Magnatech has Model 442 delivered five ID welders to a contractor specializing in reworking critical valves used in electrical power plants.

Main Steam Isolation Valves (MSIV) are used to throttle the steam flowing into a steam turbine generator.  These massive valves are critical for safety, and must close within seconds in the event of a steam line break.  They also allow maintenance to be performed on the steam turbines.

Over time, the valve seats degrade due to thermal stresses, corrosion and other factors.  These massive valves cannot be simply removed for maintenance in a workshop.  They must be reworked in-situ.  The valve actuator is removed, along with the top of the valve body.  The valve seat is located 4-6’ below.  A fixture is mounted on the top of the valve.  This locates the machining tool precisely to machine out the original valve seat, which is usually stellite material.

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Orbital Welding Systems For Use In The Aerospace Industry: How Magnatech Can Help!

The Aerospace Industry counts on consistent welding with Orbital Welding

Orbital welding systems are used in the aerospace industry for high-quality welds on hydraulic lines, brake lines and fuel lines, among other applications. Orbital welding involves the joining together of two pieces of metal tubing or piping without the use of a fitting to keep the two pieces still, creating a much better result than welding the pieces manually. During this welding process, an orbital weldhead rotates an electrode and electric arc around the joint, creating a sturdy, precise, long-lasting weld. In essence, orbital welding brings stability and control to the entire process.

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