MANAGING RISKMore information • See DNV Web site: http://www.dnv.com/ogpi/• Contact DNV Oslo, Dept. OCT700 (E-mail OCT730@dnv.com); or• Contact your local DNV office rev.07/00/ tsi

Designation:

DNV offshore 2000:

Recommended Practice RP-G 101

RECOMMENDED PRACTICE SUMMARY SHEET

Contents:

Scope andapplication:

Items covered by the RP include:g Concept of Risk Based Inspectiong Qualitative and quantitative RBI methodsg Calculation of consequence of failureg Calculation of probability of failureg Risk-based inspection planningg Updating of risk following inspectiong Modelling of consequence of failure for safety and economic consequencesg Modelling of degradation mechanismsg Use on piping, pressure vessels, tanks, heat exchangers, pig launchers and traps

The purpose of this recommended practice is to describe a method by which a risk basedinspection (RBI) plan may be established for offshore production systems.The document outlines methods for evaluating probability and consequence of failure, makingan assessment of the risk level, and concluding on the appropriate actions, such as inspection,that can be taken to manage that risk.

The objectives of this RP are to:g provide an internationally acceptable practice for carrying out risk-based inspection planing

for offshore topsides pressure systemsg achieve an optimal schedule for the inspection activities whilst ensuring that the overall

installation risk acceptance criteria, set by the operator, are not exceededg identify and apply the optimal inspection or monitoring methods according to the identified

degradation mechanismsg specify procedures and methodology to be followed for optimal inspection planning to focus

inspection effort on items where the economic or safety risks are identified as being high, andsimilarly to reduce the effort applied to low risk systems

Objectives:

RBI of offshore topsides

References: This Recommended Practice is part of the new series of DNV Offshore Services Specifications,Offshore Standards and Recommended Practices. The RPs cover proven technology andsolutions which have been found to represent good practice, and/or which represent onealternative way of satisfying acceptance criteria requirements stipulated in the DNV OffshoreStandards or other codes cited by DNV. DNV RPs are issued within the areas of:g quality and safetyg materialsg structuresg systemsg special Facilitiesg pipelines & risersg asset operation

pressurised equipment