Can you explain more about Geohazards and Weather-Related Outside Forces?

Geohazards and Weather-Related Outside Force The threat category ‘Outside Force’ in a risk assessment typically includes forces such as ground/earth movement, flooding, cold weather, and lightning. When buried pipelines cross sloping terrain, there is a danger that soil movement (down the slope) will impose an excessive load on the pipe that could lead to failure.  […]

Risk Profiling

Pipeline Risk Assessment—Risk Profiling In earlier installments of this column, we introduced the concept of pipeline risk assessment Essential Elements (EE’s).  That guideline is a list of ingredients that must be included in any pipeline risk assessment before that assessment can be considered complete.  Following these guidelines helps to ensure a technically sound risk assessment […]

Pipeline Risk Assessment

Risk assessment on any facility is most efficiently done by first dividing the facility into components with unchanging risk characteristics. For a cross-country pipeline, this involves collecting data on all portions of the pipeline and its surroundings and then using this data to ‘dynamically segment’ the pipeline into segments of varying length. Risk algorithms are […]

ILI vs DA—The Risk View

A rather common issue these days is decision making involving comparisons between In Line Inspection (ILI) vs Direct Assessment (DA, and, in particular, External Corrosion DA or ECDA).  You may need to research these techniques, if not already familiar to you, since we will assume the reader is fairly familiar with both. Both are acceptable […]

Damage vs failure: a risk assessment needs to know the difference

To measure resistance in a way most useful to a risk assessment, we must estimate the possible presence of weaknesses, the rate of emergence of future weaknesses, and the role of each weakness in strength reduction. By W. Kent Muhlbauer, WKM Consulting, Austin, TX, USA Since several of our recent columns have dealt with management-of-risk […]

Is this the same as SRA, LSD?

This recommended pipeline risk assessment methodology is similar to SRA (Structural Reliability Analyses) and LSD (Limit State Design) or LRFD (Load and Resistance Factor Design).  This is coincidental, since the methodology was developed independently from these techniques.  However, despite the similarities, there are key differences. Similarities include: Focus on engineering principles rather than incident history Accommodates […]

Pipeline Reliability–Service Interruption As ‘Failure’

Generally, a pipeline’s reliability includes consideration of all leak/rupture scenarios PLUS all other scenarios that could prevent the system from performing its intended function.  With the normal ‘intended function’ being something like:  deliver product to point B from point A at specified flow rates, pressures, temperatures, and product quality, a reliability failure occurs when any […]