This standard practice outlines a methodology to assess pipeline integrity because of the threat internal corrosion in on- shore and offshore pipelines and other piping systems that normally carry multiphase fluids (gas, water, and oil) termed multiphase flow internal corrosion direct assessment (MP-ICDA). Liquid separators (drips), compressing stations, vessels, and other equipment not related to pipelines are not included in this standard. This standard applies to pipelines, and piping systems both onshore and offshore, containing carbon dioxide (CO2), hydrogen sulfide (H2S), oxygen (O2), and other corrosive species. Additionally, this standard applies to pipelines that continuously contain a liquid phase (water and condensate and/or oil and/or petroleum compounds), a possible solids content of various mineral scales, biofilms, or corrosion product compounds, and a continuous gas phase with fluid conditions that are not specifically covered by NACE SP01101 for wet gas internal corrosion direct assessment (WG-ICDA). Additionally, solids may be included as a phase by itself and may also be included in multiphase flow analysis of fluid streams.

This standard is intended for use by pipeline operators, oil/gas producers (upstream), and other pipeline industry in- dividuals who manage pipeline integrity (both onshore and offshore) for pipelines that are normally under multiphase loading conditions and are outside the scope of NACE SP0110,1 NACE SP0206,2 and NACE SP0208.