What is RBI ?
Risk based integrity assurance is a proactive process used to understand
equipment risk profile at any particular time during its lifecycle
and put in place strategies to manage and reduce potential risks.
Risk Based Inspection (RBI) forms a major part of this assurance
process as applied to static equipment items of plant. It is an
optimized inspection plan derived from a detailed integrity risk
assessment of each equipment item.
RBI is replacing traditional fixed interval inspection of static
equipment items of plant in many companies. In a typical chemical
plant, the static equipment items may include reactors, distillation
columns, heat exchangers, various other types of pressure vessels,
reformers, boilers, fired heaters, piping, storage tanks, etc.
Our RBI technology process jointly developed by PP SIMTECH & BP
Chemicals has been shown to improve integrity, safety & equipment
availability whilst achieving the financial benefits linked with
RBI. Some of the major benefits are attributable to identification
of damage mechanisms which were not inspected for previously, better
understanding of EACH equipment item vulnerabilities, elimination
of needless intrusive inspections of some items (replaced with non-invasive
inspection methods, often when the equipment is on-line), extension
to internal inspection intervals for most items (i.e. found to be
over-inspected previously) and in many cases extension to existing
plant run-length time between turnarounds and quicker TA times than
In simple terms, our RBI technology is a process to manage structural
integrity of a plant item based on the potential risks caused by
its damage mechanisms. The integrity risk assessment is carried
out by a multi-discipline team study process and particularly focuses
attention on all active and potential damage mechanisms which could
affect an item. This is followed by an evaluation of integrity risk
profiles for each of the identified damage mechanisms for the item.
Optimised inspection plan (inspection interval, method & scope)
is then set up, which addresses each of the damage mechanisms applicable
to the item, whilst ensuring the effectiveness and capability of
the selected NDT inspection methods match identified damage mechanisms.
Other mitigating strategies identified by the RBI team are also
set up to support the optimised inspection intervals. Through this
process the identified risks associated with each item are managed
within defined acceptance levels, thus providing equipment integrity
assurance and reliability at optimum costs to plant owner.
Our RBI Assurance technology process is fully supported by RBI
Assurance system software, rbiAsystTM also
jointly developed by PP SIMTECH & BP Chemicals.