Piping Related Abbreviations (E)

EFW is an abbreviation of Electric Fusion Welding.
Electrofusion welding is a technique for joining thermoplastic pipes using a molded sleeve with an electrical resistance heating coil and an electrofusion machine.

ELL is an abbreviation of ELbow.

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 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.