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Definition(s)

Rerating

• NOTE: A rerating may consist of an increase, a decrease, or a combination of both. Derating below original design conditions is a means to provide increased corrosion allowance.

Rerating

A change in either the design temperature rating, the MDMT or the MAWP rating of a vessel. The design temperature and MAWP of a vessel may be increased or decreased because of a rerating. Derating below original design conditions is a permissible way to provide for additional corrosion allowance.

Rerating

Definition(s)

Required thickness

The minimum thickness without corrosion allowance for each element of a pressure vessel based on the appropriate design code calculations and code allowable stress that consider pressure, mechanical, and structural loadings. Alternately, required thickness can be reassessed and revised using FFS analysis in accordance with API 579-1/ASME FFS-1.

Required thickness

Definition(s)

Repair Organization

1. an owner/user of piping systems who repairs or alters his or her own equipment in accordance with API 570,
2. a contractor whose qualifications are acceptable to the owner/user of piping systems and who makes repairs or alterations in accordance with API 570,
3. an organization that is authorized by, acceptable to, or otherwise not prohibited by the jurisdiction and who makes repairs in accordance with API 570.

Repair Organization

1. the holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp;
2. the holder of another recognized code of construction certificate that authorizes the use of an appropriate construction code symbol stamp;
3. the holder of a valid R-stamp issued by the National Board for repair of pressure vessels;
4. the holder of a valid VR-stamp issued by the National Board for repair and servicing of relief valves;
5. an owner or user of pressure vessels and/or relief valves who repairs his or her own equipment in accordance with this code;
6. a repair contractor whose qualifications are acceptable to the pressure vessel owner or user;
7. an individual or organization that is authorized by the legal jurisdiction to repair pressure vessels or service relief devices.

Repair Organization

1. The holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp (e.g. U-stamp).
2. The holder of a valid R-stamp issued by the National Board.
3. An owner or user of pressure vessels who repairs his or her own equipment.
4. A contractor whose qualifications are acceptable to the pressure-vessel owner or user.
5. An individual or organization that is authorized by the legal jurisdiction.

Definition(s)

RBI

RBI

Risk-based inspection (RBI)

RBI

A risk assessment and management process that considers both the probability of failure and consequence of failure due to material deterioration and that is focused on inspection planning for loss of containment of pressurized equipment in processing facilities due to material deterioration. These risks are managed primarily through inspection in order to influence the probability of failure but can also be managed through various other methods to control the probability and consequence of failure.

RBI

Definition(s)

Risk-based Inspection

Risk-based Inspection

A risk assessment and management process that considers both the probability of failure and consequence of failure due to material deterioration and that is focused on inspection planning for loss of containment of pressurized equipment in processing facilities due to material deterioration. These risks are managed primarily through inspection in order to influence the probability of failure but can also be managed through various other methods to control the probability and consequence of failure.

Risk-based Inspection (RBI)

Risk-based Inspection