Configure Gas Tracing
To configure gas tracing, a 32-bit long integer field with the model name GASTRACEWEIGHT is required for every feature belonging to the gas network. This field must be assigned the weight named GasTraceWeight (exact spelling) to enable gas network tracing autoupdaters. Autoupdaters set the value of the gas trace weight field when a feature is created (On Create) or updated (On Update). This value is in a binary format and set by autoupdaters according to values in other significant fields with specific model names, depending on configuration. For example, if the valve's normal position field has a value of closed, then the autoupdater will set Bit 30 of the gas trace weight field to a value of 1.
Bit 25 for Edges: Exclude an edge from gas tracing
ArcFM Solution gas trace solvers consider that an edge with this bit set does not support the flow of gas. For most features in the gas network, the bit should be unset. However, this bit should be set for Cathodic Protection wires such as Rectifier Cable, Bond Wire, and Anode Wire. This prevents those features from being traced during Gas Pressure or System traces. Furthermore, if a valve is closed but has a bond wire connecting the pipe on either side, then the gas trace will return incorrect results unless the wire has Bit 25 set. All ArcFM gas trace solvers, except the CP trace, will use this bit to set edge barriers. This bit may be set using a field with the PIPESTATUSINDICATOR field model name assigned.
Bit 30 for Junctions: Exclude a junction from gas tracing
ArcFM Solution gas trace solvers consider that a junction with this bit set does not support the flow of gas. Typically, junctions should have this bit unset to allow traces to pass through the feature. If needed, however, you can assign the GASNONTRACEABLE model name to junctions to set Bit 30 and prevent traces from passing through junctions.
The Appendix also includes information about how Gas Tracing works.