Sprinkler servicing intervals under BS EN 12845

Five routines, each asking a different question

The routine looks like a list of chores. It is not. Each interval asks a different question, and knowing which is which is the difference between a real maintenance record and a signed sheet.

Weekly: is the system standing correctly?

Water and air pressure gauges read and recorded. The alarm motor tested. Where a pump is fitted, a start test.

This is a site task. It needs somebody competent on the premises and a logbook, not a contractor. The value is not the individual reading, it is the trend: a gauge that has quietly dropped two bar over six weeks is telling you something that a single reading never will.

Monthly: is the water still there?

Water levels in any suction or storage tank, the condition of the tank itself, and on a diesel set the fuel level and the battery condition.

Short, unglamorous, and the one that catches a failed ball valve before a tank that should be full is a third empty. On a stored-water system the tank is the whole capability: a pump that starts perfectly against an inadequate supply still cannot deliver the design duration. The annual internal inspection sitting behind that monthly check is covered in sprinkler tank inspection and cleaning.

Quarterly: does water movement raise an alarm?

The flow switch test. Water is moved through the system and the alarm has to sound as a result.

This is a genuinely different test from the weekly one, and it is the one people conflate. Proving that a valve opens is not the same as proving that opening it alerts anybody. A sprinkler that operates in an empty building at two in the morning, with no alarm raised, is a flood rather than a fire suppression event.

Half-yearly: the interim service

A contractor visit rather than a site task. The alarm arrangements are proved, the valve set is examined, and on a dry or pre-action installation the air pressure, the compressor and the trip arrangements are checked as well.

It exists because twelve months is a long time to leave a mechanical assembly that spends the whole period doing nothing. Most of what an annual service finds would have been cheaper to fix at six months.

Annually: does the whole installation still perform?

Full inspection of the installation, valve set testing, and the pump proved under flow.

That last part is where most annual services quietly fall short. Running a pump to hear it start proves the starter and the battery. Proving it delivers its rated flow at its rated pressure needs it run against a known duty. Only one of those is a performance test.

What the annual service actually involves

“Annual service” covers a wide range of work in this trade, and the gap between the thorough version and the quick one is where most of the price difference between two quotations sits.

A full annual on a sprinkler installation includes:

• The control valve sets stripped, cleaned, the seats and clappers examined, new washers where needed, and reassembled. Not looked at, stripped.
• The alarm proved from the test valve, both the water motor gong and the flow switch where both are fitted.
• The pump run under flow against its performance curve, with the measured flow and pressure written on the report. See our guide to fire pumps for why a start test is not this.
• The water supply proved for the flow and duration the hazard class requires, rather than assumed from the design drawings.
• The installation inspected against the design: head spacing, obstructions, clearances below heads, and anything installed since the last visit.
• Spare heads and the sprinkler spanner checked as present and correct for the heads actually fitted.

That last one is small and it is failed constantly. A cabinet of spare heads that do not match the heads in the ceiling is not spares.

Who is allowed to do which part

The weekly and monthly routines sit with the responsible person under the Regulatory Reform (Fire Safety) Order 2005. They can be delegated to a competent member of site staff, and most buildings do exactly that, with a logbook kept at the panel or in the plant room.

Everything from the quarterly test upwards needs somebody competent in sprinkler systems specifically. That is not a formality: a flow switch test carried out without isolating the alarm transmission summons a fire engine, and a valve set reassembled wrongly leaves the installation shut.

What you cannot delegate is the duty. The work can be contracted out. The responsibility for it having happened stays with whoever controls the premises, which is why the records matter as much as the visits.

What a complete record looks like

An auditor is not reading your system. They are reading your paperwork. A complete record has:

• Weekly logbook entries, in sequence, with no unexplained gaps
• Quarterly test records showing the alarm was raised, not just that the valve was operated
• An annual certificate covering the installation and the pump
• Follow-up on faults, so a defect found in March has a repair recorded against it

The gaps are what get read, not the entries. The last of those four is the one most often left open, because closing it means a repair rather than a visit, and what a sprinkler repair involves is priced separately from the servicing.

Where LPC Rules come in

The standard behind all five routines is set out in BS EN 12845 in plain English, and if you want the regime run against it rather than against a template, that is sprinkler servicing.

For risk-rated premises the insurer may work to the LPC Rules alongside BS EN 12845. In practice that usually means tighter requirements on water supplies, hazard classification and the standard of installation, and it is the reason an LPCB approved contractor matters on a policy: a system installed by one counts as genuine risk mitigation, and one installed by anybody else may not.

If your insurer has asked a question about your sprinkler system that the standard alone does not answer, LPC Rules is usually where the answer lives.