What is the difference between seamless and welded pipe?

Seamless tube is extruded and drawn from a billet while welded tube is produced from a strip that is roll formed and welded to produce a tube. Welded tube is considerably less expensive than seamless tube and is readily available in long continuous lengths.

Does pipe have a welded seam?

While it’s true that welded pipe does include a seam that makes it theoretically weaker, manufacturing techniques and quality assurance regimens each have improved to the extent that welded pipe will perform as desired when its tolerances aren’t exceeded.

What are the methods of joining pipes?

Common joining methods include: Adhesive bonding, brazing, CSST, flanged, grooved, heat-fusion weld, hubless coupling, mechanical, PEX, press, quick connect, solder, solvent weld, SV gasket, threaded and welding.

Which is stronger seamless or welded pipe?

Seamless steel is stronger than welded pipes, making it more expensive because of the higher production cost. On the other hand, welded steel pipes are easier to manufacture due to the cheaper cost of production and raw material availability.

How is pipe welded?

Pipe welding uses arc welding techniques, including shielded metal arc welding (SMAW), gas metal arc welding (GMAW) – including both MIG and MAG welding, flux-cored arc welding (FCAW), submerged arc welding, and tungsten inert gas (TIG) welding.

What do you use to thread a gas line?

Coat threads with pipe thread compound or gas-rated Teflon tape before assembling.

What is the most commonly used groove shape for pipe?

Butt Welding Joint. A Butt Weld is a circumferential butt welded joint, and the most common type of joint employed in the fabrication of welded pipe systems. A butt joint is the most universally used method of joining pipe to itself, fittings, flanges, Valves, and other equipment.

What is welded steel pipe used for?

Seamless pipes are mainly used as pipes or structural parts for conveying fluids, mainly used in machinery industry, while welded pipes are mainly used in construction industry, conveying low-pressure fluids such as water, gas, compressed air, etc. However, seamless steel pipes are used in pressure pipes.

What are threaded pipe connections used for?

Threaded Connections are widely used for small bore piping having nominal diameters NPS 2 or smaller. This is the oldest pipe joining method and still highly popular. Threaded pipe fittings are used for non-critical applications with lower temperatures and pressure services. The majority of threaded fittings are used in the plumbing industry.

What are premium oilfield pipe threads?

Called Premium Threads, these connections provide additional tensile capacity and improved hydraulic sealing. They also provide easier makeup of the string. Premium oilfield pipe threads usually attempt to improve on the API standards.

How do you minimize the stress on pipe joints?

The layout of piping employing threaded joints should minimize stress on joints, giving special consideration to stresses due to thermal expansion and operation of valves. Threaded components of a specialty nature that are not subject to external moment loading, such as thermometer wells, may be used under severe cyclic conditions.

What determines the efficiency of oilfield pipe threads?

One of the major factors that determine the efficiency of a well is determining kinds of oilfield pipe threads, their size, and what their strength should be for the different casings, tubes, and downhole equipment. In fact, it’s not always possible to procure new Oil Country Tubular Goods (OCTG) for every well.