The presence of multiple characteristics, conditions, or factors in a pipeline that may interact or coincide with each other. Combined featuresThe presence of multiple characteristics, conditions, or factors in a pipeline that may interact or coincide with each other. Combined features can have severe … can have severe implications for the pipeline's integrityThe capability of a pipeline to perform its intended function safely and reliably throughout its life. It includes a range of factors, including the structural …, performance, and maintenance requirements.