Configure Domains for Cathodic Protection Systems

The cathodic protection system functionality in ArcFM requires the configuration of the following domains.

Material Conductivity domain

TIP: The ArcFm sample data is configured to represent gas or water network edges composed of any of five material subtypes. Material subtypes are crucial to the proper modeling of cathodic protection systems, which relies on determining whether pipes are electrically conductive. These material subtypes are configurable via the Material Conductivity domain in conjunction with feature class configurations.

Each edge feature class in your gas or water network relies on its particular ArcFM Gas Trace Weight or Water Trace weight autoupdater to determine whether it is made of conductive material, for the purposes of cathodic protection, and to encode that information in the feature’s weight field. The autoupdater makes that determination by applying the Material Conductivity domain to the edge feature’s Subtype value. The purpose of the domain is to map each of the possible Subtype codes for edge features in the gas or water network onto a value that signifies “conductive” or “non-conductive”.

You can add additional material subtypes to your configuration. For features participating in cathodic protection systems, this process requires configuration in two places:

  1. Define a new material in the Material Conductivity domain:
    1. In ArcCatalog, right-click your database and select Properties. The Esri Database Properties window displays.
    2. Click the Domains tab.
    3. In the list of domains, click the Material Conductivity domain.
    4. Add a new Coded Value in the table at the bottom of the window. This value represents either the material subtype (if the feature class uses material subtypes) or a coded value in the relevant material domain (if the feature class uses a material domain). Enter a value (integer or text) in its Code cell. In its Description cell, enter 1 if the material is electrically conductive or 0 if it is non-conductive.
    5. Click OK.
  2. Depending on the feature class, choose one of the following sets of steps:
    • Define the new material subtype in a feature class:

    1. In ArcCatalog, right-click a feature class (e.g., Distribution Main) and select Properties. The Esri Feature Class Properties window displays.
    2. Click the Subtypes tab.
    3. Add a new value (integer or text) in the Code column of the Subtypes table—the same one you added to the Material Conductivity domain.
    4. Name the material in the Description column.
    5. Click OK.
    • Define a new material type in a domain:

    1. In ArcCatalog, right-click the geodatabase. The Database Properties window displays.
    2. Click the Domains tab.
    3. Locate the relevant material domain.
    4. Add a new value (integer or text) in the Code column of the Coded Values table—the same one you added to the Material Conductivity domain. Name the material in the Description column.
    5. Click OK.

Surface Area Conversion Factor domain

This domain ensures that ArcFM correctly calculates the surface area of cathodically protected pipe in your gas or water network.

By default, this domain is configured assuming that length is measured in feet and diameter is measured in inches. The conversion factor, therefore, defaults to 0.0833333333 (one foot divided by 12 inches per foot).

If, for example, your length units are meters and your diameter units are centimeters, change the conversion factor to 0.01 (one meter divided by 100 centimeters per meter):

  1. In ArcCatalog, right-click your database and select Properties. The Esri Database Properties window displays.

  2. Click the Domains tab.

  3. In the list of domains, click the Surface Area Conversion Factor domain.

  4. In the Coded Values table, change the description of FACTOR to the another number.

NOTE: If you delete this domain, or the description in its Coded Value table is not a valid decimal number (e.g., contains special characters), the conversion factor defaults to 0.0833333333.
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