Managing  Gas  Pressure  Systems  in  ArcGIS

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

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?

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

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

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

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

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

Review  Process

• The  system  sends  a  nightly  email  summarizing  any  Gas  Pressure  Systems  that  need  review

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

Deploying  Across  the  Enterprise

Desktop,  Web  and  Mobile

Search  for  a  Gas  Pressure  System

Deploying  Across  the  Enterprise3  layers• Service,  Distribution  Main,  Distribution  Main  (Large  Scale)• Colors  are  manually  set  

Deploying  Across  the  Enterprise

• Joined  Main/Service  feature  classes  to  GasPressureSystem table

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