Why SCADA Runs on Fibre, and What 17 Kilometres of It Involves

Most of a control system is invisible and most of it is cheap. The instruments are small, the controllers are small, and the data they produce would fit down a domestic broadband line with room to spare.

Then somebody asks how the data gets from the far end of a pipeline to a control room sixty kilometres away, and the project acquires an excavator.

The decision, made once, for decades

There are three honest options for a distributed asset. Radio. Cellular. Fibre.

Radio and cellular are cheaper to install and quicker to commission, and both introduce the same dependency: someone else's network, someone else's coverage, someone else's decision about when to retire a generation of equipment. For a temporary installation that is a good trade. For a water transmission main the client expects to operate for thirty years, it is a recurring argument with no end.

Fibre costs more on day one. What it buys is immunity to the electrical noise that surrounds anything switching megawatts, capacity far beyond what telemetry needs, and ownership of the path. It removes an entire category of future question about why the data stopped arriving.

What 17 kilometres actually involves

In 2023 we delivered the SCADA system for the potable water pipeline on Jabal Mibrih Road, and the headline number in that scope was the supply, laying and termination of 17 kilometres of fibre optic cable along the route.

The cable itself is the smallest line in that budget. What 17 kilometres means in practice is route survey and wayleaves, trenching and ducting through ground that already contains other people's services, chambers at pulling and jointing positions, cable drums staged along the route, splicing, termination into patch panels at each end, and reinstatement of everything that was dug up.

Then the testing that makes it an asset rather than a hope: an end to end optical loss budget, and an OTDR trace that records where every splice and every bend physically is. That trace is the document somebody needs two years later when a contractor who has never heard of the pipeline puts a bucket through it.

The SCADA design, configuration, testing and commissioning sat in the same contract. That is deliberate. When the network and the system it carries are split between two suppliers, every intermittent fault becomes a meeting.

Inside a station it is the same argument at shorter range

Grid work uses fibre for a different reason. A substation is one of the electrically noisiest environments there is, and the distances are short enough that copper would technically work. It is used anyway, because a fibre link between a bay cubicle and the station level carries no earth path and no induced voltage, which removes a whole class of nuisance and a whole class of hazard.

• On TRANSCO project N-15223, fibre optic cabling was part of the SCMS replacement across six grid stations from 400 kV down to 11 kV, alongside the servers, gateways and bay control units.
• At Al Khazna the communications cabinet is where the ring comes together, upper and lower, at 33 and 11 kV.
• At Khalifa Port the scope across three primary substations included roughly a kilometre of fibre and the civil works to carry it, plus the IT and network build to connect it to the port's own stakeholders.

Nobody knows where the ducts are

The recurring problem on brownfield networks is not laying new fibre. It is knowing what is already there.

On the ADWEA enterprise GIS upgrade our scope was a communications as built survey checked against actual site condition across 45 power stations and 31 water stations, with the tabular as built data updated to match. The entire value of that work was in the differences it found between the record and the ground.

That is worth saying plainly, because it is the least glamorous work we do and it saves the most money. Every network eventually gets extended by someone who was not there when it was built.

Three things worth specifying early

Spare cores, generously. Cores are the cheapest item in the whole exercise and re trenching is the most expensive. Specify for the system you might have in fifteen years.

Duct capacity, not just cable. A spare duct is what lets the next project avoid the road entirely.

Where the record will live. Route drawings, chamber positions, splice locations and the OTDR traces need an owner and a home before the trench is closed, not after.

Working with us

Almafor supplies, lays, terminates and tests fibre optic networks for control and monitoring systems across Abu Dhabi and the wider UAE, with the ducts, chambers and reinstatement that go with them, and the SCADA layer that runs over the top. One contract, one point of responsibility from the trench to the control room.

Call +971 55 954 5801 or email info@almafor.com.