Fire sprinkler head guard

Head guards are required for damage-prone fire sprinklers, but careful selection is required

Physical damage to a fire sprinkler head is the most common reason for a fire sprinkler to unnecessarily discharge. Whether it's a rogue basketball in a school gym or a clumsy forklift operator in a warehouse, accidental discharge happens.

No amount of physical protection can stop all unintentional discharges. But adding fire sprinkler head guards to a pendent, upright, or horizontal sidewall sprinkler can provide a critical layer of protection.

In this article, we explain why fire sprinklers need head guards and when fire code requires them. You'll learn how to choose a fire sprinkler head guard and about at the three types we carry: standard, recessed, and standard guards with a baffle.

Fire sprinkler head guards stop flooding by protecting delicate components

Automatic fire sprinklers feature small, fragile parts that allow water to escape when surrounding temperatures rise. Some have a liquid-filled bulb that bursts at a given temperature. Others have a small metal link, called a fusible link, that falls from the sprinkler head when the metal fusing it to the frame melts.

Fire sprinkler head bulb

Countless fire sprinkler heads feature small, heat-sensitive bulbs like the one pictured here. Source: Wikipedia.

Small impacts can lead to expensive cleanups. Schools, malls, hotels, and other places flooded by unwanted fire sprinkler discharge have paid thousands or even tens of thousands of dollars to repair the damage.

Many of these incidents might have been avoided if the fire sprinklers had guards. A head guard, or sprinkler cage, uses steel wire or another material to put a protective barrier around the sprinkler head.

Each fire sprinkler cage clamps around the base of the sprinkler frame, providing an inch or more of protective metal wiring around the sprinkler. Some fire sprinkler cages are designed for use with one specific type and size of fire sprinkler. Others can protect sprinklers across multiple brands and in multiple sizes.

But because the head guard secures to the base of the fire sprinkler—and can sometimes be installed only by removing the fire sprinkler head—the size of the fire sprinkler's thread connection matters. Most fire sprinklers have a thread connection in one of two sizes: 1/2" or 3/4".

Fire sprinkler thread connection

The threaded base of a fire sprinkler screws into system piping. Most fire sprinkler cages attach here. Source: Wikipedia.

Impact-prone heads in NFPA-compliant fire sprinkler systems require listed head guards

In cities around the United States, local governments have adopted fire codes authored largely as standards by the National Fire Protection Association (NFPA). Their guidelines for fire sprinklers, available in NFPA 13: Standard for the Installation of Sprinkler Systems, require cages for select fire sprinklers:

From the 2016 edition of NFPA 13

16.2.6 Sprinklers subject to mechanical injury shall be protected with listed guards.

Fire sprinkler system designers place each sprinkler with several factors in mind. If the sprinkler's spray can't get to where it needs to go, a fire may spread. When this code calls for a "listed" guard, it means that fire sprinkler cages should be evaluated for use with specific sprinkler models, ensuring that their discharge pattern and coverage remains unaffected.

Non-listed fire sprinkler cages are typically designed for a special purpose. Some protect against occasional light contact, but not against direct impacts. Others act as a temporary head guard, protecting sprinklers during renovations or in other situations where sprinkler heads may face intense impacts.

Before purchasing or installing a new head guard, check with your local fire marshall or authority having jurisdiction (AHJ).

Standard fire sprinkler head guards are the go-to solution for many fire sprinkler types

A standard sprinkler cage protects non-recessed pendent, upright, or horizontal sidewall fire sprinklers. In simpler terms, this type of head guard is suitable if the base of the sprinkler's frame is flush with the disc, or escutcheon, surrounding it.

Pendent fire sprinkler with no head guard

This pendent fire sprinkler would be a good candidate for a standard head guard. Source: Wikipedia.

QRFS stocks this type of fire sprinkler head guard in three colors: fire-engine red, chrome, and white. These head guards, designed for occasional light contact, can be attached during installation or during a retrofit.

 

 

 

Recessed fire sprinkler head guards protect recessed pendent sprinklers

These head guards have an extended base that allows them to grip the thread connection on a recessed fire sprinkler. Recessed sprinklers, like the one pictured below, sit in an escutcheon with a slight indentation. The base of the frame isn't quite flush with the ceiling.

 

Installed recessed fire sprinkler head guard

A chrome recessed fire sprinkler head guard. Notice the slight indentation in the silver disc, or escutcheon, at the sprinkler's base.

This head guard provides protection for the part of the sprinkler exposed below the ceiling and extra cushion around the recessed bottom half of the frame. QRFS's recessed head guard is available in a chrome finish. Like our other guards, these protect against light contact and fit both 1/2" and 3/4" fire sprinklers.

A standard head guard with a baffle meets the needs of sprinklers in storage applications

In shelving and storage applications, spray from one fire sprinkler can cause another to discharge too late. The standard head guard with a baffle protects upright fire sprinklers and stops water from nearby sprinklers from cooling the sprinkler's heat-sensitive element. QRFS carries sprinkler cages with baffles to protect sprinklers against light contact, including the red guard pictured below. Like our other guards, this head guard fits both 1/2" and 3/4" fire sprinklers.

An emerging selection of heavy-duty head guards promises extra protection for sprinklers in high-impact environments

The head guards shown so far do an excellent job of protecting against small collisions — and prove equally useful in warning passers-by to keep their distance. But they're not strong enough to protect against especially severe forms of damage. In environments where heavy objects pass near sprinkler heads, where fast-moving objects fly through the air, or where a broken sprinkler head could prove extremely costly, installers now have the option of using heavy-duty head guards.

A large cage made from thick pipe surrounds a fire sprinkler

Click here to browse our selection of heavy-duty head guards, which surround sprinkler heads and standard guards to provide extra protection.

These extra-large guards secure directly to sprinkler pipes, and are available in three configurations:

  • Horizontal pipe runs
  • Vertical pipe ends
  • Horizontal pipe ends

Here's a list of common sprinkler and heavy-duty head guard pairings:

  • Pendent or upright heads directly on a branch line tee - horizontal pipe runs
  • Pendent sprinklers on a drop - vertical pipe ends
  • Upright sprinklers on a sprig - vertical pipe ends
  • Sprinklers on an elbow where pipe terminates - horizontal pipe ends

For more on heavy-duty head guards, click here to browse our selection, or check out these articles:

Head guards provide cost-effective protection against devastating accidents

Breaking a sprinkler head is no small matter. For contractors and facilities managers looking to avoid a major headache — one that involves calls to the fire department, insurers, water damage repair contractors, and fire sprinkler installers — head guards are an investment that can't be beat.

Click here to view QRFS's full selection of fire sprinkler head guards.

Questions about protecting your sprinklers? Call us at +1 (888) 361-6662 or email [email protected].

If this article helped you choose a head guard, check us out at Facebook.com/QuickResponseFireSupply or on Twitter @QuickResponseFS.