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+Jason Hugo

#1 - Fire Sprinklers: Standard Response vs Quick Response

Posted by Jason Hugo on 2/28/2016 to How a Fire Sprinkler Works

In 1996, the NFPA 13 Standard, which deals specifically with fire sprinkler systems, was updated to require quick response fire sprinklers in all light hazard occupancies. As a result of this change, most newer office buildings, restaurants, hotels, and schools now employ quick response sprinklers instead of the traditional standard response sprinkler. But what is the difference between a quick response and standard response fire sprinkler?

In this blog, we'll explore the slightly different mission of standard response verse quick response fire sprinklers and how to tell them apart with ease. If a lighthearted education isn't the reason for your visit today, feel free to skip directly to our online selection of fire sprinklers.

Since Henry S. Parmelee invented the first automatic fire sprinkler in 1874, the goal of delivering water exactly where it is needed as early in the fire's development as possible continues to drive innovation in the fire sprinkler industry. However, the challenges Henry faced in his Piano factory differ from those of a high rise building, a modern warehouse, or a university brimming with students. In response to these unique fire hazards, engineers have developed different types of fire sprinklers.

Six primary aspects of a fire sprinkler impact its usefulness for various buildings:
  • Thermal sensitivity
  • Temperature rating
  • Orifice size
  • Installation orientation
  • Water distribution characteristics
  • Special service conditions

But many of the options available for temperature, orifice size, and others are available for both quick and standard response sprinklers. While those alone are not the key differences, if you need to deviate for a second to better understand a fire sprinkler's thermal sensitivity, we'll wait.

Standard response fire sprinklers can be found in warehouses, factories, and other commercial or industrial buildings. A standard response sprinkler's mission is to pre-wet materials around the fire removing the fire's fuel source. Drenching the surrounding area slows the fire, buying critical time for the fire department to get on-scene. Containing the fire in its origin location and suppressing its growth is the focus.

Quick response fire sprinklers are installed primarily in light hazard applications (e.g., office buildings, schools, etc.). They have similar fire-control benefits as a standard response sprinkler, but their focus is slightly different. A quick response sprinkler discharges water higher on the walls to keep the fire from climbing and maintain lower ceiling temperatures. Cooler ceilings reduce the likelihood of flashover and slow a fire's rise within a building. Improving the odds for human survivability is the quick response sprinkler's mission.

Quick response sprinklers got their name from their slightly faster response time when compared to standard response sprinklers. Their only physical difference is the bulb size. The standard response sprinkler has a 5 mm glass bulb and the quick response sprinkler has a 3 mm glass bulb. The smaller bulb achieves improvements in thermal responsiveness.

Difference Between Quick and Standard Response Fire Sprinklers

Differences also exist in spacing, density, and placement of sprinklers within a quick response system compared to a standard response system. These changes combined with the smaller bulb are all designed to support the quick response sprinkler's mission.

So which do you need? The answer depends on your project: new construction or replacement.

Ceiling height, ambient room temperature, occupancy status, NFPA guidelines, local regulations, and more factor into which type of sprinkler is the best fit for any given situation. If you're constructing a new building, hire a local, qualified fire sprinkler contractor with a design team. Their staff will know what is needed and whom to ask when questions arise.

If you're replacing fire sprinklers in an existing system, it is best practice to match the old sprinkler's type and temperature with the new. So here's a trick so you can use today: on most fire sprinklers, all the information is stamped on the deflector. Just get up close and take a look for yourself, like in the image below:

Get to Know Your Fire Sprinkler Infographic

If you'd like more information about replacing fire sprinklers, check out 5 fire sprinkler replacement tips. If you're still unsure about what type you need or your sprinkler's deflector doesn't have the details, then call or write QRFS - we've been known to have customer's text us pictures to help them identify their sprinklers and get replacements ordered!

As my parting words, it's important to note that both types of fire sprinkler have specific areas of coverage and control fire hazards per NFPA 13 guidelines. Regardless of their different missions, both are fire-fighting superheroes that deliver drastic reductions in water used, greenhouse gasses emitted, and they save lives.

Now you can order 1 or 1,000 of either sprinkler type in different styles, finishes, and temperatures from wherever you are right now: browse QRFS' fire sprinkler selection.

This article originally posted on January 14, 2013, on QRFS.com by Jason Hugo. It was updated on February 28, 2016. If you'd like to learn more, visit qrfs.com/blog, tweet with us @QuickResponseFS, or connect at facebook.com/QuickResponseFireSupply.


Date 12/10/2014
Ruth Rolfe
Hello: Is it ever possible that you could have a Quick Response sprinkler that does not have QR engraved on it. Even if the bulbs are similar to those that you have described as being QR only- how can you be sure they are not standard? Thank you.
Date 6/12/2015
Robert Crowe SR
Need 50 quick response extended range 155F 3/4" facing down. If you have them E Mail the price & delivery to Brownsville TX 78520. The water pressure is 40 PSI from a water pump than drops as more heads go off. Its for Mexico no regulations & I have no insurance. It for my own protection only. want to space the heads 20 F apart so need the extended range type.
Date 12/12/2015
Dear All. i have one doubt.. i want the quick response sprinkler..but now i have standard response only..can i use the standard response sprinkler..area is chemical storage area.. please reply me...

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