How to drain a residential Fire Sprinkler System: A guide for UK homeowners

When it comes to fire safety, your residential fire sprinkler system is one of the most reliable lines of defence against potential disaster. However, like any mechanical system, it requires consistent maintenance to ensure it operates effectively. Whether it is for repairs, renovations, or system alterations, there are times when draining the fire sprinkler system would be needed.

What follows is an overview of the key steps to drain a residential fire sprinkler system safely and responsibly. However, it is strongly recommended that a qualified professional carry out the draining, as improper handling may lead to damage, non-compliance or other safety risks.

Why would you need to drain your residential fire sprinkler system?

There are several valid reasons for draining your sprinkler system, including:

• System alterations

• Component replacements or repairs

• Construction or renovation work

Before you begin: A word of caution

Draining a fire sprinkler system is not a DIY project for a homeowner. Improper handling can lead to:

• Water damage

• Reduced fire protection

• Voided insurance

• Unprotected property

Unless you are a qualified engineer or technician, it is advisable to engage a qualified service provider such as Fire Sprinkler Servicing Ltd, who provides maintenance, repair and testing services throughout the United Kingdom.

Fire Sprinkler system, control panel and valves.

How to drain a residential fire sprinkler system

If you do need to proceed with draining and have the appropriate authorisation or professional support, here are the general steps involved:

1. Notify relevant parties

Before starting, inform the building occupants and your insurance provider. It may also be necessary to inform your local fire department, particularly if your sprinkler system is under monitoring.

2. Turn off water supply

Locate the main stop valve and close it to shut off water from entering the system.

3. Open the drain/test valve

Locate your drain or test valve in the system, typically at the bottom section of the piping. Then, attach a hose or implement a suitable drainage method for effective water flow control.

4. Open auxiliary valves

Certain systems may have auxiliary drain valves or air vents that must be opened to help the system drain completely.

5. Check and confirm

Let the system drain and depressurise completely, check the system pressure gauges as you go. Check for any residual water in the horizontal pipe runs. Water can remain stagnant in areas with no lower-level drain point.

What comes next after draining?

Once you have drained the system, take the opportunity to:

• Inspect for leaks, damage or corrosion

• Replace/repair faulty parts, or carry out necessary work

• Schedule a visit with a professional company for refilling/testing

• Update maintenance records to ensure fire safety compliance

It is essential that the system is tested and recommissioned by a qualified technician before being put back into service.

Leave it to the experts

While it’s good to understand the process, most residential property owners should avoid attempting this alone. The risks to property and personal safety, along with

regulatory obligations, make this a job best handled by trained technicians.

That is where Fire Sprinkler Servicing Ltd comes in. Our experienced team offers nationwide support across the UK for:

• Fire sprinkler system maintenance

• Emergency repairs

• Compliance checks

• Recommissioning and draining of systems