RBI is an approach used to assign risk to particular assets within a facility, and thus use that risk to prioritize and drive inspection strategies. In the oil and gas industry, it is guided by the American Petroleum Institute (API) RP 580, “The Recommended Practice for Risk-Based Inspection.”
PRESSURE RELEASE DEVICE (PRD) RISK-BASED INSPECTION (RBI)
Pressure Relief Devices (PRDs) are safety devices designed to protect pressurized vessels or systems during an overpressure event. Also known as pressure safety valves (PSVs), pressure relief valves (PRVs), safety relief devices (SRDs) and relief valves (RVs), PRDs serve as the last line of defense for pressure vessels, boilers, and other structures with pressurized containment. Due to their critical nature, it is vital to have a reliable inspection program – approved procedure in place to ensure availability of PRDs, in the case of overpressure events.
TANK RISK-BASED INSPECTION (RBI)
What can be defined using an Equipment Risk-Based Inspection?
Usefulness of RBI Inspection
The combination of both the assessments in an equipment risk-based inspection helps to define the following:
- The type of future inspection (external/internal/on-stream) to be included in the inspection plan.
- The appropriateness of non-destructive examination on the equipment.
- The parts of equipment that ought to be examined in the future inspection.
- The use of pressure testing if require
- The use of repair techniques (whether it will be permanent or temporary)
Role of a Certified Inspector
A certified inspector is accountable to the equipment user to ensure the maintenance and QA/QC inspection programs in accordance with appropriate design codes and standards. He is to perform the visual inspections in order to determine all the factors which are required in both probability and consequence assessments.
Once an RBI assessment is conducted on a vessel, it should be revised after every vessel inspection, process change and repair work and whenever an unpredictable breakdown takes place.
American Petroleum Institute API 510; 3.1.65, 5.2
American Petroleum Institute API 580 Section 1.1.1
American Petroleum Institute API 581