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Model register
Zero entries; all integrity logic is deterministic thresholds and rules
The failure modes are physical and protocol-level, so no learned model is needed, no weights are held and no license question arises
Hardware class
Flameproof enclosure discipline
The junction boxes sit in the classified area, so the enclosure class is chosen against the zone at each exact position, not by part number
Hardware class
Area classification as the gating document
The zone, gas group and temperature class are read from the operator's current classification drawing before any hardware is specified, and the position list is countersigned
Hardware class
Reading an Ex certification marking
The Eex'n' marking is a Zone 2 restricted-breathing class, so a Zone 1 position would force a different, heavier enclosure and must be caught before ordering
Hardware class
Equipment protection levels drive the purchase
Protection levels, not catalog convenience, decide the explosion proof junction boxes, 24VDC power supplies, breakers and M20 Exd glands
Sensing
radar tank gauges on all 13 tanks
These are the field devices whose readings must arrive continuous, undistorted and unswapped; the design improves their signal path without modifying them
Sensing
24VDC field power supplies
They power the boosters and the loop electronics, and their health is a named failure mode with its own degraded status
Sensing
3-core 2.5 sq.mm CU/PVC/SWA/PVC loop cabling
The loop cabling is the medium the distortion travels in, so its schedule is recorded in the as-built against each loop
Sensing
Modbus RTU loop polling via the boosters
The polling cycle is the pace of truth for every check, and the boosters are what make the three loops readable end to end
Pattern
System of Context, primary
The central inventory picture is an ontology projection over the gauging host, never a shadow copy, so there is one place where tank truth lives
Ground
The operator's own site application server, on-premises
The two containers run inside the operational technology boundary on the operator's own hardware, consistent with the Pakistani Cloud First posture, so nothing about tank truth depends on a link leaving the site

Radar tank gauge integrity ontology and model register for a fuel terminal

The object model and the model and equipment register from Loop Integrity Watch: Ending Distorted Radar Level Readings and Tank-to-Tank Swapping Across the Tank Farm, an open reference architecture by CodeNinja for Pakistan. Part of the Vertical-Driven Architectures series; every design in the series is also a row in the cumulative dataset https://huggingface.co/datasets/CodeNinjatools/vertical-driven-architectures.

Files

File What it holds
objects.json 15 typed objects (Fuel Tank, Radar Tank Gauge (RTG), RTG Communication Loop, Modbus Booster (Repeater), Explosion Proof Junction Box, Gauge Reading, Data Quality Event, Central Inventory Picture, Loop Wiring As-Built, Service Order, Warranty and Support Record, OEM Authorization Letter, HSE Work Permit, Instrumentation Technician, Location Engineer), each with its anchor system, properties, status vocabulary and 15 typed links. Format hyper-ontology/1: designed with Praxis, implemented with Hyper Ontology.
models.csv The model and equipment register from the paper's Table 4, with the reason for each choice.

How to use it

import json
from huggingface_hub import hf_hub_download
p = hf_hub_download("CodeNinjatools/tank-gauge-integrity-pakistan-ontology", "objects.json", repo_type="dataset")
objects = json.load(open(p))["objects"]
print([o["label"] for o in objects])

Made with

Designed on Praxis, CodeNinja's platform for designing physical AI systems. The object model imports into Hyper Ontology, which turns it into a living system. Both are in beta; access by request.

Citation

CodeNinja Engineering Team and Umar Bilal. 2026. Loop Integrity Watch: Ending Distorted Radar Level Readings and Tank-to-Tank Swapping Across the Tank Farm. CodeNinja. https://doi.org/10.5281/zenodo.23157967. CC BY 4.0.

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