Piping Related Abbreviations A-E


AFC is an abbreviation of Approved For Construction. Approved For Construction means, that eg a piping isometric meets all requirements, and that AFTER release the prefab can begin.


BB is an abbreviation of Bolted Bonnet. A bolted bonnet, or cover of a valve, is fastened (by bolts) to the valve body to complete the pressure-retaining shell.


BBE is an abbreviation of Beveled Both Ends. Beveled Both Ends means that both ends of e.g. a pipe nipple are beveled.
TOE / POE = Treaded One End / Plain One End
TOE / BOE = Treaded One End / Beveled One End
POE / BOE = Plain One End / Beveled One End
TBE = Treaded Both Ends
PBE = Plain Both Ends


BE is an abbreviation of Beveled Ends.
Beveled Ends are applied to all diameters of buttweld pipes, flanges, fittings, valves etc. and will be directly welded (with a small gap 3-4 mm) to each other. Ends are mostly be beveled to angle 30° (+5° / -0°) with a root face of 1.6 mm (± 0.8 mm).


BOM is an abbreviation of Bill Of Materials.
A Bill Of Materials is a detailed item by item tabulated list of the project requirements for piping. It specifies the required item by the reference grade and standard to which it must be made, by the size and its rating. The information on this table is entirely extracted from the material take-off documents.


BW is an abbreviation of Butt Weld(ing).
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. This welding technique is widely applied in situations where a quality weld desired, and the weld by X-ray technically should be investigated.


CMTR is an abbreviation of Certified Material Test Report.
A Certified Material Test Report attesting that the material is in accordance with specified requirements, including the actual results of all required chemical analyses, tests, and examinations.


CSC is an abbreviation of Car Seal Closed.
Very simply, the terms describe to need to lock (seal) a valve to prevent operation either in the open or closed position. The device to achieve this is a Car Seal (see also CSO).


CSO is an abbreviation of Car Seal Open.
Very simply, the terms describe to need to lock (seal) a valve to prevent operation either in the open or closed position. The device to achieve this is a Car Seal (see also CSC).


CUI is an abbreviation of Corrosion Under Insulation.
In the simplest terms, CUI is any type of corrosion that occurs due to moisture present on the external surface of insulated equipment. The damage/attack can be caused by one of the multiple factors, and can occur in equipment operating at ambient, low, and heated services, depending upon conditions. Moreover, CUI can occur in equipment that is in service, out of service, or in cyclic service.


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 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.

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