Gas distribution skill

The Gas skill turns Nexma into a natural-gas distribution-design platform. It models gate-station-to-meter flow, validates pressure drop across regulators, and stages pressure tiers across the network.

What it covers

• Entities. GateStation, MainPipeline, DistrictRegulator, Meter, Vent,

IsolationValve, PressureSensor. Each carries typed properties (MAOP, regulator set point, valve class).

• Relationships. GateFeedPipe, PipelineConnection, ServicePipe,

RegulatorConnection. Pipes carry diameter, SDR, material, and design pressure.

• Constraints. Maximum 7 bar in distribution mains, regulator pressure-staging

rules, isolation-segment coverage, vent placement clearances.

• Constants. ANSI/ASME pipe class tables, ISO regulator capacity curves, standard

service-line sizes by meter class.

• Layer config. Gate stations as 3D extruded sites, regulators as scaled markers,

pipelines as thickness-graded lines colored by pressure tier.

• Toolbar tools. Generate distribution layout, place regulators on pressure-tier

boundaries, run pressure-drop simulation, validate vent clearances.

Typical workflow

1. Scope. Draw a service polygon — typically a town-border-station territory.
2. Sources. Place a gate station with the upstream pressure and capacity. District

regulators define pressure tiers downstream.

1. Generate. Ask Jax: "Lay distribution mains to every meter in this polygon.

Hold inlet pressure ≥1.4 bar at every meter. Stage from 4 bar to 1.4 bar."

1. Inspect. Click regulators for set point and capacity; hover mains for design

pressure and flow.

1. Refine. Move regulators, resize mains, change SDR — Jax re-runs the

pressure-drop simulation.

1. Validate. Pressure-drop check, regulator-capacity check, vent-clearance audit.
2. Export. GeoJSON, shapefile, or vendor-format files from Project → Export.

What Jax is good at, in Gas specifically

• Pressure-tier staging — sizes regulators and chooses pipe SDR per tier.
• Pressure-drop validation across long mains under design demand.
• Isolation planning — proposes valve placements that bound failure segments to

acceptable customer counts.

• Vent-clearance audits against building footprints and roadway clearances.

Standards

ANSI/ASME B31.8 transmission and distribution piping, ISO 12176 polyethylene fitting qualification, 49 CFR Part 192 distribution integrity rules (US deployments).

What it does not do (yet)

• LNG and storage facility design.
• Cathodic-protection survey workflows.
• Real-time SCADA writebacks (read-only telemetry only).