Managing Gas Pressure Systems in ArcGIS
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PG&E's gas pressure systems, which serve around 15 million people, are managed using Synergi modeling software and now stored within a GIS framework for improved access and accuracy. A new automated QA/QC process checks system configurations, while nightly email summaries aid in addressing issues identified in gas pressure systems. The changes have enhanced accessibility, awareness, and integration of related functionalities within the GIS platform.
Managing Gas Pressure Systems in ArcGIS
- 1. Managing Gas Pressure Systems in ArcGIS
- 2. PG&E Overview • Incorporated in California in 1905 • Serves about 15 million people throughout a 70,000 square-‐mile service area • More than 42,000 miles of gas distribution pipeline • 4.3 million natural gas customer accounts
- 3. Gas Pressure Systems at PG&E Historically: • Also known as Hydraulically Independent Systems (HIS) • Managed through Synergi (Synergee) modeling software • Gas Pressure Systems were not modeled in GIS -‐ why bother migrating?
- 4. Business Problem How do we store the information about the Gas Pressure System? • Gas Pressure System information is loaded into a table in GD GIS
- 5. Business Problem How do we define the boundaries of the Gas Pressure System on the map? • The Regulator Station has an attribute that contains the Gas Pressure System name • The first segment of Distribution Main out of the Regulator Station is identified through an attribute
- 6. Business Problem How do we make sure the Gas Pressure System is correctly configured? • Manually -‐ the user can choose to validate the trace using the core tools • Background Process
- 7. Automated QA/QC Automated Checks • The system runs a process on a nightly basis to trace designated Gas Pressure System Systems • If the trace completes successfully, the system: • Calculates the total length of Distribution Main • Populates the Gas Pressure System Name on the participating Main and Service
- 8. Automated QA/QC • The system automatically checks for the following conditions: • Increase in Gas Pressure System size • Decrease in Gas Pressure System size • No related Regulator Station • If the trace encounters features associated with another Gas Pressure System • The system will populate the Review Status field when the automated process is completed
- 9. Review Process • The system sends a nightly email summarizing any Gas Pressure Systems that need review
- 10. Technical Specifications • Windows Service written in ArcObjects • Multi-‐process • Utilize CPUs on machine • Uses core ArcFM trace functions • Consistent with the trace functions in ArcMap • Easy upgrade path to Facility Network • Regenerates on different conditions • Regenerate attribute • Previously determined schedule (configurable) • Updates made once per day • Staging table holds all updates to be made • Updates made during downtime to minimize conflicts/impact
- 11. Deploying Across the Enterprise Desktop, Web and Mobile Search for a Gas Pressure System
- 12. Deploying Across the Enterprise 3 layers • Service, Distribution Main, Distribution Main (Large Scale) • Colors are manually set
- 13. Deploying Across the Enterprise • Joined Main/Service feature classes to GasPressureSystem table
- 14. Realized User Benefits • Accessibility – Allows anyone with access to the GD GIS Web Viewer to see Gas Pressure Systems • Increased Awareness – Expanded the ability to review and understand of Gas Pressure Systems to all GD GIS users • Issue Identification – Provided insight into the current configuration of Gas Pressure Systems and Identified several opportunities for improvement in the current process • Integration – The application is designed to be expandable, and should allow us to move Cathodic Protection, Emergency Zone Management, and Leak Survey to a similar model