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 GEOFIELDS®  
 LIQUIDS HCA ANALYSIS 

Home Services Pipeline Liquids Spill Modeling


LIQUIDS RELEASE SPILL MODELING FOR HIGH CONSEQUENCE AREA (HCA) IMPACT
DETERMINATION.

GeoFields provides HCA impact determination for liquids pipelines using
state-of-the-art Overland Spread™ and hydrological transport modeling,
identifying and locating pipe segments that could impact HCAs. Proximity
buffering reveals those HCAs that are directly or indirectly impacted by an
analysis. Multiple levels of impact types are considered, which combine to
provide a thorough, conservative and justifiable approach to impact modeling.
Detailed documentation and results data describe the finest level of detail
behind the analysis, explaining any result, both as stationed impact segments
and on detailed integrity sheets. Resulting segments are identified by type of
HCA, impact type and transport characteristics.


DIRECT AND INDIRECT ANALYSIS

Proximity buffering is used to determine those HCAs that a pipeline directly
impacts and is within a specified distance of. This establishes those HCAs that
the pipeline would affect through an immediate and localized impact.


DRAIN DOWN AND
RELEASE VOLUME CALCULATION

Because the area that a spill would occupy, and therefore the path it would
take, is related to the volume of available product, it is necessary to model a
potential release volume at each point. This analysis takes into account terrain
effects (pooling in valleys, for example), as well as additional volumes that
are released to surge pressures, response times to close valves and other
operational factors. Once the potential release volume is calculated, it is used
in the next stage, Overland Spread™ plume modeling.


ADVANCED HYDROLOGIC
TRANSPORT MODELING

In the event a release impacts a part of the surface water system, hydrological
modeling provides an analysis of the path it would take through the system. The
path is determined by the complex interactions between stream segments, lakes
and other surface water features. Surface water transport is analyzed with a
velocity-based model that carries liquid downstream for the time it would take
to install mitigation measures to contain the release. The modeling of stream
velocity is perhaps the most in-depth part of the hydraulic transport model as
most stream segments are not monitored for flow velocity, so a complex model
involving flow accumulation, discharge statistics and gradient was developed and
continues to be refined.


DETAILED REPORTING

Map products from the RiskFrame Liquids HCA Analysis are configured to meet
several different specifications. The HCA impact bands on delivered integrity
alignment sheets directly relate to the map and show the segments that the
analysis determines have the potential to impact an HCA are indicated as red
bars, organized by HCA type. In addition, a series of tabular and spatial data
outputs are generated to allow the results to be integrated into the client’s
pipeline database. Clients that already use GeoFields pipeline data management
system receive scripts to update their database.


RELEASE POINT CALCULATION

Points along the pipeline are designated for modeling purposes as potential
release points. These are typically evenly spaced at a high density, and are
supplemented with significant terrain features, such as high and low points, as
well as particularly sensitive locations such as water crossings. The resulting
set of release points forms the basis for each of the subsequent analyses. In
the final stage of the analysis, those points that have the potential to impact
a high consequence area are used to generate HCA could-affect segments.


WAVE-FRONT OVERLAND SPREAD™

The path that a pipeline release would take is not a simple point-to-point
analysis. Released product has interactions with terrain including reflected
wave fronts, pooling in low points, spreading in multiple directions and leaving
a residual volume. A sophisticated spill analysis considers these factors; the
Overland Spread™ component of RiskFrame Liquids HCA Analysis accounts for all of
these. In addition, through the use of a variable product retention parameter,
the evaporation and absorption characteristics of the product are accounted for.


QUALITY CONTROL

GeoFields incorporates several Quality Assurance and Quality Control (QA/QC)
checks to assure accurate results of the Liquids HCA Analysis. The underlying
data, having such a vast extent and detail, infrequently contains errors, which
are either trapped by the model itself or by subsequent quality control
procedures. This flagging procedure identifies plumes, which, for a number of
possible reasons, have not met criteria established by the client or GeoFields.



Services

 * Pipeline GIS Starter Kit
 * Alignment Sheets
 * Construction Sheets
 * Data & Application Hosting
 * Data Capture, Conversion & Migration
 * Data Model Consulting
 * Data Integration & Post Processing
 * Data Quality Audit & Assessment
 * Field Data Collection
 * Gas HCA & Class Location
 * Integrity Sheets
 * Liquids HCA Analysis
 * Needs Assessments & Planning
 * PIMS Implementation
 * Pipeline Integrity Management & Risk Assessment
 * Project Data Management & Survey Support



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