Gas Pressure System

The purpose of this trace is to find connected features of equal operating pressures with two types of regulators acting as barriers: either all regulators or regulators with different inlet and outlet pressures. For the All Regulators option, the solver only looks at regulators for junctions that have Bit 20 (Regulator) set. It sets these features as the barriers to the trace and performs the trace, disregarding the Bit 17 (Gas Pressure System Boundary) setting. For the Regulators with different inlet and outlet pressures option, the solver looks for junctions with both Bit 20 and Bit 17 set. This option allows you to stop the pressure system trace at features other than regulators. For valves, the solver looks at only Bit 17.

The results include all of the features reached from the flag except for the Regulators that were barriers for the trace. Regulators placed along a complex edge will not interrupt the selection of the entire complex edge. The Drawing option for returning results allows you to draw only individual segments of the complex edge.

Object Class Model Names: Regulator

Field Name (can be any name)

Field Model Name (exact spelling)

Gas Pressure System Status


Normal Position



SOPIN (optional)


SOPOUT (optional)

Pressure System Bit Interpretations

  • Bit 17 - Specifies if the device is a gas pressure system boundary. The gas pressure system is the system operating under the same pressure. Regulators are an example of the pressure system boundary. This bit setting depends on the existence of the following field model names: GASPRESSURESYSTEMSTATUS, NORMALPOSITION, SOPIN, and SOPOUT.

    • If NORMALPOSITION exists, this field value will be used to set the bit. A value of 1 means that it is a boundary. A value of 0 means that it is not a boundary.

    • If NORMALPOSITION does not exist but GASPRESSURESYSTEMSTATUS does, this field value will be used to set the bit. A value of 1 means that it is a boundary. A value of 0 means that it is not a boundary.

    • If neither NORMALPOSITION or GASPRESSURESYSTEMSTATUS exist, ArcFM the looks for both SOPIN and SOPOUT. If both field model names are found, ArcFM compares their values: if the values are different, then the bit is set. If the values are the same, the bit is not set; 1 means that it is a boundary, 0 that it is not.

  • Bit 20 - This bit specifies if a device is a regulator and depends on the existence of the class model name Regulator; 1 means that it is, 0 that it is not.

  • Bit 25 - This trace does not traverse any edges for which bit 25 is set.

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