Rotors (gear-timed) Flanges (full raised face thickness) Valves (relief control) Sight glasses Sulfide stress cracking MAWP (maximum allowable working pressure) Induction motors Bearings (cylindrical spherical hydrodynamic) Seals (gaskets labyrinth mechanical) Vortex breakers (and baffles) RTDs (resistance temperature detectors) NPS (nominal pipe size) Skids Thermocouples Thermowells Gussets Bolts Pallets Studs Nozzles Couplings Keys Separators Tachometers Traceability Conduits Vessels Transmitters Transducers