Guidance on DNV's DRILL notation

OFFSHORE TECHNICAL GUIDANCEPerformance testPressure testOverhaul: Testing of the intended functioning of a component. Low pressure as well as ratedworking pressure is required. Operators to be tested as well as the main function itself.: Test, usually hydrostatic but may involve other fluids or gas, to test pressures as per therelevant standards.: Process of restoring and maintaining an equipment, machine, or system in a serviceablecondition. Overhaul involves (1) partial or complete disassembly of the item, (2)inspection to detect damaged, defective, or worn parts, (3) repair or replacement ofsuch parts, and (4) reassembly, testing, and trial-run prior to returning the item to its fulloperating level. Overhaul does not involve modifications to the original design.Over-pressure test : also referred to as proof test. With the component completely assembled but notpainted, and internal mechanisms in open position as applicable, all outlets should beblanked off. The component should then be pressurized to a test pressure asdetermined by the relevant design code, or as specially agreed.RefurbishmentRe-manufacturing: See definition of overhaul: Total or partial dismantling and weld, repair and/or stress relieving heat treatment, e.g.after rewelding ring grooves, bores etc. of pressure containing components. Gates ingate valves, flaps in non-return valves, rams in ram type BOP's, annular preventer bagelements or other sealing elements that moves. Pressure energized sealing such as ringgaskets are not classed as dynamic seals.AbbreviationsCVI Close Visual InspectionDPIIIPLPIMPIMWPNDTPWHTUPSPSVROVIBOPWPDye Penetrant InspectionIn-service Inspection program. A DNV developed inspection plan containing the structural items to besurveyed to satisfy the requirements of main class, excluding any additional class notations (note forcolumn stabilized and self-elevating units only)Liquid Penetrant Inspection (also known as DPI)Magnetic Particle InspectionMaximum Work Pressure (maximum pressure for which item is designed)Non Destructive TestingPost Weld Heat TreatmentUninterrupted Power SupplyPressure Safety ValveRemote Operated VehicleInternal Blow Out PreventerWorking PressureOther definitions and abbreviations can be found in Ch. 1 Sec. 1 of both OSS-101 and OS-E101.DET NORSKE VERITASPage 4OTG-07