Enduratank Highlights Importance Of Fire Sprinkler Water Tanks

According to the British Automatic Fire Sprinkler Association (BAFSA), since 1945 no one in the UK has died as a result of a fire in a building with a working sprinkler system.

In 2015/16 there were 303 fire related fatalities and 7,661 casualties in fires. For every million people in England, there were 5.5 fire related fatalities in 2015/16.

Automatic Sprinkler Facts

Automatic sprinkler systems are used more than any other fixed fire protection system and over 40 million sprinklers are fitted world-wide each year.

Sprinkler systems have been proven in use for well over 100 years. Possibly the oldest in Britain was fitted in 1812 at the Theatre Royal Drury Lane and updated form is still in use today.

Losses from fires in buildings protected with sprinklers are estimated to be 1/10th of those in unprotected buildings.

In buildings fully protected by sprinklers:

• 99% of fires were controlled by sprinklers alone

• 60% of fires were controlled by the spray from no more than 4 sprinklers

• Source: European statistics over 10 year period

• Accidental discharge of water from all causes is 1 in 500,000 (per year of service)

• Accidental discharge of water due to manufacturing defects is 1 in 14,000,000 (per year of service)

Sprinkler System Water Storage

Needless to say, the storage of the correct amount of water on site is paramount. There have been incidents particularly in rural areas where there was only minimal storage of firefighting water on site which meant that the water that was there was used to protect neighbouring properties rather than saving the property that was on fire.

Tank Requirements for Dwelling Properties

There are two main capacities for sprinkler tanks. A tank is classified as 'full holding capacity' when all water necessary for the sprinkler system is stored on site. For example an Ordinary Hazard 15m (OH3 15m) wet-type sprinkler system would have a 135m3 tank.


A 'reduced capacity' tank for the same hazard could be as small as 30m3 provided the inflow from the service mains could make up the shortfall of 105m3 in 60 minutes.

The required durations for provision of water for firefighting purposes are set out below:

• BS EN 12845 Light Hazard – 30 minutes

• BS EN 12845 Ordinary Hazard – 60 minutes

• BS EN 12845 High Hazard – 90 minutes

• BS 9251 Residential – 30 minutes

• BS 9251 Domestic – 10 minutes

• Schools (TB221) OH1 – 30 minutes

• Schools (TB221) OH2+3 – 60 minutes

• NFPA – Varies; 30-240 minutes

Tank Requirements for Non-Dwelling Properties

Many agricultural properties are located in areas away from a mains water supply or suffer from insufficient water pressure to enable the effective fighting of fire. A high percentage of these properties don't have the benefit of a borehole, a stream, a river or standing water nearby either and are therefore obliged to seek alternative water resources.

Building regulations applicable in England and Wales, in addition to those specifically relating to Scotland, have certain requirements with regards to fire safety and the arrangements which must be in place to assist fire and rescue authorities in the fighting of fires. Both the Scottish Office and HMG have issued a number of Guidance Documents to be read in conjunction with the relevant building regulations and we shall limit ourselves to those concerned with Statutory guidance contained within Approved Document B (fire safety) Volume 2: buildings other than dwelling houses (as amended 2010 & 2013). The contents of this document are mirrored by that issued in Scotland.

Section 15 of Approved Document B deals with Fire Mains and Hydrants and sub section 15.8 specifically states;

"Where no piped water supply is available, or there is insufficient pressure and flow in the water main, or an alternative arrangement is proposed, the alternative source of supply should be provided in accordance with the following recommendations;

• a charged static water tank of at least 45,000 litres capacity; or

• a spring, river, canal or pond capable of providing or storing at least 45,000 litres of water at all times of the year, to which access, space and a hard standing are available for a pumping appliance; or

• any other means of providing a water supply for fire-fighting operations considered appropriate by the fire and rescue authority."

Water Storage Tank Types

There are many different options of water storage tanks for sprinkler systems. Concrete, Galvanised Steel, GRP to name but a few. However, many of these options are either very costly or time consuming and difficult to install.

Enduratank manufactures a large range of rotationally moulded, one piece, medium density polyethylene water storage tanks at its factory in Lincolnshire. These tanks range in size from 150 litres up to 30,000 litres and by simply linking tanks together the capacity can be increased to 40,000, 50,000 or 60,000 litres, or whatever the individual requirement may be.

Simple and quick to install and available in a range of colours with the option of low profile tanks and insulated tanks if required, we are sure that we have the solution which will enable you to meet the requirements as outlined within the guidance documents.

For more information or to talk to a member of Enduratank's sales team, call 01778 562810 or visit www.enduratank.co.uk