دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a method of joining steel components in which acetylene gas and oxygen are mixed in a torch to attain the high temperatures necessary for welding. As an early type of welding (it was also called oxyacetylene welding),its primary disadvantage was the seepage of molten weld material onto the interior surface of the pipe, often leading to corrosion problems.

v: to join metals by utilising the arc created between the welding rod, which serves as an electrode, and a metal object. The arc is a discharge of electric current across an air gap. The high temperature generated by the arc melts both the electrode and the metal, which fuse.

n: a welding technique for joining pipe ends. Two general types of automatic welding used in pipeline construction are submerged-arc welding and automatic wire welding.

n: an automatic welding process utilising a continuous wire feed and a shielding gas. Automatic wire welding is similar to semiautomatic welding except that manual adjustment of the rate of wire feed and amount of shielding gas is unnecessary. See also semiautomatic welding.

n: the final welding pass made to complete the uniting of two joints of pipe.

n: A heavy flanged connection that is installed on top of a casing string. Once it is installed, it provides a housing for the next casing string, which is suspended from it. Also called a spool.

a term that applies to the wellhead flange that forms the transition between pipe and the flange-build tree. It may be attached by threads, welding, pressure forming or lock-ring/screw devices.

n: the process of welding two pipe joints together-usually on a doublejoint rack-to form a single piece of pipe. The usual length of a double joint for pipeline construction is 80 feet (24 metres).

n: arc, gas, or plasma welding performed in an underwater habitat with a gas environment at ambient pressure.

n: pipeline construction workers responsible for welding fabrication assemblies into the line. The fabrication crew works independently of the rest of the spread. face mask n: a mask made of a rubber frame surrounding a clear, flat lens, used to seal all or a portion of a divers face from the underwater environment.

n: fourth of five passes or beads in pipeline welding.