2　Terms

2.0.1　Shop fabrication

Manufacture process in a shop with certain production capacity and fabrication procedures.

2.0.2　Petrochemical piping

Piping system used for conveying toxic，flammable，combustible，and non-toxic，non-flammable，noncombustible gas/liquid in petrochemical plants and auxiliary facilities.

2.0.3　Fittings

Parts of piping components，which are the elements directly connected to the pipe used to connect，branch，change flow direction in a piping system，including elbows，bends，tees，crosses，reducers，couplings，bushing and nipples，unions，hose connectors，stub ends，o'lets，plugs，caps，etc.

2.0.4　Piping components

Pipingelements suitable for joining or assembly into pressure-tight，fluid-containing piping systems，including pipes，tubing，piping fittings，flanges，gaskets，bolting，valves and expansion joints，the flexible joints，pressure hoses，steam traps，strainers and separators，etc.

2.0.5　Fabricated joint

The weld joint where work piece may be rotated for welding.

2.0.6　Fixed joint

The weld joint where work piece may be rotated for welding.