Details
In hydrocarbon processing, communication is a safety system. It is specified against hazard, audited, and expected to work during the events that make everything else stop.
The three constraints
Certification. In classified zones every radio, battery, antenna and accessory must be ATEX or IECEx certified as an assembly. Fitting a standard battery ends the certification instantly. This is the discipline that fails most often in practice, and it fails quietly.
Coverage inside steel. A process unit is a dense three-dimensional structure of vessels, columns and pipe racks. Signal blocks and reflects over distances of metres. Coverage is measured unit by unit, not predicted from a site plan.
Auditability. Permit-to-work coordination, isolation confirmations and emergency response all need to be reconstructable. That means recorded, time-stamped traffic with defined retention.
Areas and what they need
| Area | Requirement |
|---|---|
| Process units | Certified equipment, measured coverage within the structure |
| Tank farms and loading | Certified equipment, coverage across open but obstructed ground |
| Control room | Dispatch position, recording, visibility of every group |
| Maintenance and workshops | Usually unclassified; certified units issued on entry |
| Pipelines and remote stations | Wide-area coverage, telemetry, often layered |
| Perimeter and marine loading | Coverage to the jetty, interoperability with port and coastguard |
Technology
DMR covers most plants and offers the widest range of certified models. TETRA is specified where the site is very large, where interoperability with public emergency services is required, or where the resilience argument justifies its cost. PoC supports fleets and pipeline patrols beyond the plant.
Where the plant needs both, a gateway and a single control-room position keep it as one operation rather than two.
Safety features that are actually used
- Man-down and lone worker — automatic alarm on inactivity or on the radio going horizontal, with acknowledgement
- Emergency button with priority pre-emption of routine traffic
- Location — where the alarm came from, which in a process unit is the difference between a search and a response
- Radio check — confirming a lone worker's device is powered and in coverage without them answering
These are the features that appear in the safety case. They are also the ones that get disabled by careless programming, which is why programming is a controlled activity with a documented configuration.
Operating the estate
Certified batteries tracked by serial number and replaced on a schedule; repair only through authorised channels with original parts; documented periodic inspection of housings, seals and markings; and coverage re-verification after every significant construction or turnaround, because a new structure changes the RF picture inside a unit.
TechnoRF supplies against your zone classification, maintains the certified spares and battery pool, handles authorised repair, and keeps the documentation an inspection will ask for. See company profile or get in touch.
Frequently Asked Questions
Does the whole site need ATEX equipment?
No — only the classified zones, which is what the facility’s explosion protection document defines. Control rooms, offices, workshops and much of the perimeter are usually unclassified, and specifying certified equipment for every user is a substantial and unnecessary cost. What matters is that anyone who enters a classified zone carries certified equipment when they do.
Why is coverage difficult inside a refinery?
Because a process plant is effectively a metal maze. Columns, vessels, pipe racks and steel structures block and reflect signal, so coverage varies over metres rather than hundreds of metres. Prediction models built for terrain do not describe this, which is why refinery coverage design begins with measurement inside the structure and treats each unit separately.
How is pipeline communication handled?
In layers. Radio along the corridor where a repeater chain is justified, PoC over cellular where operator coverage reaches, satellite or HF for remote sections, and telemetry over a separate path for valve stations and monitoring points. Which mix is right depends on terrain and on what an outage on that section would cost.
Do we need voice recording?
For anything that could become the subject of an incident investigation, yes. Recorded and time-stamped traffic is what allows a permit-to-work sequence or an emergency response to be reconstructed afterwards, and it is increasingly expected by both regulators and insurers. Retention period and access control are set at design time, under KVKK.