EFW
EFW is an abbreviation of Electric Fusion Welding.
Electric fusion welding steel pipe is electron beam welding, directed impact kinetic energy electron beam, the use of high-speed movement into a hot workpiece to leave the workpiece melting, the formation of the weld. EFW pipes are formed from hot-rolled plates and welded welds. Welding flashes can be removed from the outside or inside using the caulking blade surface. Welding zone can also be heat treatment, so that the weld is not visible. Welded tubes generally have tighter dimensional tolerances than seamless tubes, and if made in the same amount, the cost is lower. Mainly used for dissimilar steel welding sheet or high power density welding, metal welding parts can be quickly heated to high temperatures, melting any refractory metals and alloys. Deep melting welding speed, heat-affected zone is very small, so the impact on the joint performance is small, the joint is almost no deformation. But it has special welding room requirements because of the use of X-ray welding.
ELL
ELL is an abbreviation of ELbow.
ERW
ERW is an abbreviation of Electric Resistance Welded.
Originally Electric Resistance Welded which contains a solid phase butt weld, was produced using resistance heating to make the longitudinal weld (ERW). Most pipe mills now use high frequency induction heating (HFI) for better control and consistency. However, the product is still often referred to as ERW pipe, even though the weld may have been produced by the HFI process.
ESV
ESV is an abbreviation of Emergency Shutdown Valve.
A Emergency Shutdown Valve is an actuated valve designed to stop the flow of a hazarous fluid or external hydrocarbons (gases) upon the detection of a dangerous event.
These valves are the final defence against process misreactions and have a function which requires much more reliable performance than standard remotely operated on-off valves.
