Fire sprinkler

This article is about the device discharging the water. For the complete system, see fire sprinkler system.
Fire sprinkler with red liquid alcohol
Fire sprinkler system visible above parked cars on MV Spirit of Vancouver Island auto ferry in British Columbia.

A fire sprinkler or sprinkler head is the component of a fire sprinkler system that discharges water when the effects of a fire have been detected, such as when a predetermined temperature has been exceeded. Fire sprinklers are extensively used worldwide, with over 40 million sprinkler heads fitted each year. In buildings protected by properly designed, and maintained fire sprinklers, over 99% of fires were controlled by fire sprinklers alone.[1][2][3]

History

In 1812, British inventor Sir William Congreve patented a manual sprinkler system using perforated pipes along the ceiling. When someone noticed a fire, a valve outside the building could be opened to send water through the pipes.[4]

A large furniture factory had repeatedly burned down, and Hiram Stevens Maxim was consulted on how to prevent a recurrence. As a result, Maxim invented the first automatic fire sprinkler. It would douse the areas that were on fire, and it would report the fire to the fire station. Maxim was unable to sell the idea elsewhere, but when the patent expired the idea was used.[5][6]

Henry S. Parmalee of New Haven, Connecticut created and installed the first automatic fire sprinkler system in 1874, using solder that melted in a fire to unplug holes in the otherwise sealed water pipes. At the time he was the president of Mathusek Piano Works. Parmelee invented his sprinkler system in response to exorbitantly high insurance rates. Parmalee patented his idea and had great success with it in the U.S. Parmalee called his invention the "automatic fire extinguisher".[7] He then traveled to Europe to demonstrate his method to stop a building fire before total destruction.

His invention did not get as much attention as he had planned. Most people could not afford to install a sprinkler system. Once Parmalee realized this, he turned his efforts on educating the insurance companies about his system. He talked about how the sprinkler system would reduce the loss ratio, thus saving money for the insurance companies. He knew that he could never succeed in obtaining contracts from the business owners to install his system unless he could ensure for them a reasonable return in the form of reduced premiums.

In this connection he was fortunate enough to enlist the sympathies of two men, who both had connections in the insurance industry. The first of these was Major Hesketh, who, in addition to being a cotton spinner in a large business in Bolton, was Chairman of the Bolton Cotton Trades Mutual Insurance Company. The Directors of this Company and more particularly its Secretary, Peter Kevan, took an interest in Parmalee’s early experiments. Hesketh got Parmalee his first order for sprinkler installations in the cotton spinning mills of John Stones & Company, at Astley Bridge, Bolton, followed soon afterwards by an order from the Alexandra Mills, owned by John Butler of the same town.

Although Parmalee got two sales through its efforts, the Bolton Cotton Trades Mutual Insurance Company was not a very big company outside of its local area. Parmalee needed a wider influence. He found this influence in James North Lane, the Manager of the Mutual Fire Insurance Corporation of Manchester. This company was founded in 1870 by the Textile Manufacturers' Associations of Lancashire and Yorkshire as a protest against high insurance rates. They had a policy of encouraging risk management and more particularly the use of the most up-to-date and scientific apparatus for extinguishing fires. Even though he put tremendous effort and time into educating the masses on his sprinkler system, by 1883 only about 10 factories were protected by the Parmalee sprinkler.

Back in the U.S., Frederick Grinnell, who was manufacturing the Parmalee sprinkler, designed the more effective Grinnell sprinkler. He increased sensitivity by removing the fusible joint from all contact with the water, and, by seating a valve in the center of a flexible diaphragm, he relieved the low-fusing soldered joint of the strain of water pressure. By this means the valve seat was forced against the valve by the water pressure, producing a self-closing action, so that the greater the water pressure, the tighter the valve. The flexible diaphragm had a further and most important function. It caused the valve and its seat to move outwards simultaneously until the solder joint was completely severed. Grinnell got a patent for his version of the sprinkler system. He also took his invention to Europe, where it was a much bigger success than the Parmalee version. Eventually, the Parmalee system was withdrawn, which left an open path for Grinnell and his invention.[8]

US regulations

Fire sprinkler application and installation guidelines, and overall fire sprinkler system design guidelines, are provided by the National Fire Protection Association (NFPA) 13, (NFPA) 13D, and (NFPA) 13R.

California and Pennsylvania require sprinklers in at least some new residential construction.[9]

Fire sprinklers can be automatic or open orifice. Automatic fire sprinklers operate at a predetermined temperature, utilizing a fusible element, a portion of which melts, or a frangible glass bulb containing liquid which breaks, allowing the plug in the orifice to be pushed out of the orifice by the water pressure in the fire sprinkler piping, resulting in water flow from the orifice. The water stream impacts a deflector, which produces a specific spray pattern designed in support of the goals of the sprinkler type (i.e., control or suppression). Modern sprinkler heads are designed to direct spray downwards. Spray nozzles are available to provide spray in various directions and patterns. The majority of automatic fire sprinklers operate individually in a fire. Contrary to motion picture representation, the entire sprinkler system does not activate, unless the system is a special deluge type.

Open orifice sprinklers are only used in water spray systems or deluge sprinklers systems. They are identical to the automatic sprinkler on which they are based, with the heat sensitive operating element removed.

Automatic fire sprinklers utilizing frangible bulbs follow a standardized color-coding convention indicating their operating temperature. Activation temperatures correspond to the type of hazard against which the sprinkler system protects. Residential occupancies are provided with a special type of fast response sprinkler with the unique goal of life safety.

Quick Response Sprinklers

The NFPA #13 standard was revised in 1996 to require Quick Response Sprinklers in all buildings with light hazard occupancy classification.

The 2002 edition of the NFPA #13 standard, section 3.6.1 defines quick response sprinklers as having a response time index (RTI) of 50 (meters-seconds)1/2 or less. The term quick response refers to the listing of the entire sprinkler (including spacing, density and location) not just the fast responding releasing element! Many standard response sprinklers, such as extended coverage ordinary hazard (ECOH) sprinklers, have fast responding (low thermal mass elements) in order to pass their fire tests. Quick response sprinklers are available with standard spray deflectors, but they are also available with extended coverage deflectors.[10]

QUICK RESPONSE FIRE SPRINKLERS
Quick Response per NFPA 13 RTI < 50 (ms)1/2 Nominal Diameter in mm Norbulb Model[11] Operating Time in Seconds Response Time Index (RTI) (ms)1/2
Yes 2.5 N2.5 9 25
Yes 3 N3 11.5 33
Yes 3.3 N3.3 13.5 38
No 5 NF5 23 65
No 5 N5 32 90

Operation

A sprinkler with a green bulb indicating a liquid alcohol and intermediate temperature classification.

Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb (see below) or a two-part metal link held together with fusible alloy such as Wood's metal[12] and other alloys with similar compositions.[13] The glass bulb or link applies pressure to a pipe cap which acts as a plug which prevents water from flowing until the ambient temperature around the sprinkler reaches the design activation temperature of the individual sprinkler. Because each sprinkler activates independently when the predetermined heat level is reached, the number of sprinklers that operate is limited to only those near the fire, thereby maximizing the available water pressure over the point of fire origin.

The bulb breaks as a result of the thermal expansion of the liquid inside the bulb.[14] The time it takes before a bulb breaks is dependent on the temperature. Below the design temperature, it does not break, and above the design temperature it breaks, taking less time to break as temperature increases above the design threshold. The response time is expressed as a response time index (RTI), which typically has values between 35 and 250 m½s½, where a low value indicates a fast response.[15] Under standard testing procedures (135 °C air at a velocity of 2.5 m/s), a 68 °C sprinkler bulb will break within 7 to 33 seconds, depending on the RTI.[16] The RTI can also be specified in imperial units, where 1 ft½s½ is equivalent to 0.55 m½s½. The sensitivity of a sprinkler can be negatively affected if the thermal element has been painted.

Maximum Ceiling Temperature Temperature Rating Temperature Classification Color Code (with Fusible Link) Liquid Alcohol in Glass Bulb Color
100 °F / 38 °C 135-170 °F / 57-77 °C Ordinary Uncolored or Black Orange (135 °F / 57 °C) or Red (155 °F / 68 °C)
150 °F / 66 °C 175-225 °F / 79-107 °C Intermediate White Yellow (175 °F / 79 °C) or Green (200 °F / 93 °C)
225 °F / 107 °C 250-300 °F / 121-149 °C High Blue Blue
300 °F / 149 °C 325-375 °F / 163-191 °C Extra High Red Purple
375 °F / 191 °C 400-475 °F / 204-246 °C Very Extra High Green Black
475 °F / 246 °C 500-575 °F / 260-302 °C Ultra High Orange Black
625 °F / 329 °C 650 °F / 343 °C Ultra High Orange Black

From Table 6.2.5.1 NFPA13 2007 Edition indicates the maximum ceiling temperature, nominal operating temperature of the sprinkler, color of the bulb or link and the temperature classification.

Types

There are several types of sprinklers:[17]

ESFR

ESFR (Early Suppression Fast Response) refers to both a concept and a type of sprinkler. "The concept is that fast response of sprinklers can produce an advantage in a fire if the response is accompanied by an effective discharge density--that is, a sprinkler spray capable of fighting its way down through the fire plume in sufficient quantities to suppress the burning fuel package."[18] The sprinkler that was developed for this concept was created for use in high rack storage.

Early suppression fast response (ESFR) sprinkler heads were developed in the 1980s to take advantage of the latest fast-response fire sprinkler technology to provide fire suppression of specific high-challenge fire hazards. Prior to the introduction of these sprinklers, protection systems were designed to control fires until the arrival of the fire department.

Unwanted alarms

Wet Piping Systems

Air trapped in the sprinkler piping can cause false alarms. To correct, bleed as much air as possible from the trapped high points of system piping. This condition can be minimized by opening the remote inspector’s test valve and slowly filling the system with water when placing the system in service.

Some water supplies may create surges and cause false alarms. The water flow device includes a retard or delay setting built into the switch, preventing the signal from being sent until the paddle is held forward, by water flow, for a set length of time.[19] For Wet Piping Systems, the time delay can be adjusted from 0 to 90 seconds (see the section on the waterflow indicator device).[20] The specifications for one Medical Center said to set the Wet Piping Systems Water flow Alarm Switches at an initial setting between 20 and 30 seconds.[21]

Dry Piping Systems, Waterflow switches

Waterflow switches on dry systems do not need retards as there should not be any water surges.[22]

See also

References

  1. ↑ "Domestic and Residential Fire Sprinkler Information". Retrieved 25 March 2014.
  2. ↑ "Fire Sprinklers". Fire Sprinklers Scotland. Retrieved 6 February 2013.
  3. ↑ "Industrial Fire sprinklers". Fire Safety Advice Centre. Retrieved 6 February 2013.
  4. ↑ Dana 1919, p. 12
  5. ↑ Chinn, George M. (1951), The Machine Gun I, Bureau of Ordinance, page 127.
  6. ↑ US 141-72, Maxim, Hiram S., "Improvement in Fire Extinguishers", issued July 22, 1873
  7. ↑ Dana 1919, pp. 16–21
  8. ↑ Dana, Gorham (1919), Automatic Sprinkler Protection (second ed.), John Wiley & Sons, Inc.
  9. ↑ Wotapka, Dawn (December 22, 2010). "Builders Smokin' Mad Over New Sprinkler Rules". The Wall Street Journal.
  10. ↑ http://classes.sdc.wsu.edu/classes/arch433/specs/evolution%20of%20fire%20sprinklers.PDF Date Retrieved: 11-24-2015 The Evolution of Modern Automatic Fire Sprinklers | By By: David L. Asplund, P .E. | 7/9/2007
  11. ↑ Norbulb manufacturer of glass bulbs
  12. ↑ metal Wood's metal definition at Dictionary.com Unabridged (v 1.1). Retrieved May 17, 2008
  13. ↑ Low Melting Point Bismuth Based Alloys. Alchemy Castings product information.
  14. ↑ Sprinkler bulb specifications, Day Impex Ltd.
  15. ↑ SFPE (NZ) Technical Paper 95 - 3: Sprinkler response time indices. Society of Fire Protection Engineers, New Zealand Chapter.
  16. ↑ JOB bulbs technical data
  17. ↑ Multer, Thomas L. (1 September 2009). "Sprinkler Protection of Storage Facilities Goes Green". BNP Media. Retrieved 6 February 2013.
  18. ↑ 20th Edition NFPA Fire Protection Handbook Volume II
  19. ↑ http://plumbingengineer.com/content/back-basics-wet-dry-sprinkler-system#sthash.nOLRjMgc.dpuf Plumbing Engineer
  20. ↑ http://www.vikinggroupinc.com/manuals/Wet%20System%20Manual.pdf Viking, Wet System, Technical Manual for Operation, Maintenance, and Troubleshooting, Page 35 False Alarms
  21. ↑ ftp://carrigg.com/CURRENT%20PROJECTS/TME-WC%20402-12-545%20%20PROJECT/VA241-12-R-0698-A00001016%20-%20Specification.pdf MAINE VA MEDICAL CENTER specifications, page 21 13 13 - 6
  22. ↑ https://lerc.org/pdf/Sprinkler_Monitoring_Training_Manual.pdf Potter Electric Sprinkler Monitoring Training Manual, Page 18, paragraph 2, Last sentence

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