The bulb breaks as a result of the thermal expansion of the liquid inside the bulb.  The time it takes for a bulb to break depends on the temperature. Below the design temperature, it does not break, and above the design temperature, it breaks, reducing the time required for rupture when the temperature exceeds the design threshold. Response time is expressed as a response time index (RTI), which typically has values between 35 and 250 m1/2s1/2, with a low value indicating a rapid response.  For standard test methods (air at 135°C at a speed of 2.5 m/s), a sprinkler lamp at 68°C breaks in 7 to 33 seconds, depending on the ITR.  Access to information can also be expressed in imperial units, where 1 ft1/2s1/2 is equivalent to 0.55 m1/2s1/2. The sensitivity of a nozzle can be negatively affected if the thermal element has been painted. We have learned many lessons from these system errors. The NFPA standard that governs the design and installation of sprinkler systems – NFPA 13, the standard for installing sprinkler systems – has evolved to address these failure mechanisms. NFPA 25, the standard for inspection, testing and maintenance of water-based fire protection systems, has also evolved to address many of these failure mechanisms. Inspection, Testing and Maintenance (ITM) is defined in Chapter 3 of NFPA 25 as follows: If you follow the test and inspection plan, maintenance is easy. Whenever a component fails inspection or testing, it`s time to repair or replace it. If components show signs of rust, corrosion, or wear, you can detect and replace them during your testing and inspection process.
A reputable testing and inspection company is familiar with NFPA 25 and is able to perform all necessary maintenance within the schedule required to ensure compliance. To stay up to date on mandatory sprinkler inspections and testing, download our free printable nozzle test chart at the end of this article. The resource includes a schedule for all sprinkler inspection and testing requirements – annual, semi-annual, quarterly, monthly and other. In addition to regular inspections, maintenance and testing of sprinkler systems are also important components of the overall process. A test is a more elaborate physical check to ensure that the sprinkler system not only appears to be working, but actually working as it should. Routine sprinkler maintenance and repair is essential to keep your sprinklers in good condition. Be sure to do your research to find the best sprinkler maintenance companies to make sure your business is safe. The quarterly, annual and every five and ten year inspection of the sprinkler system, as well as the maintenance, testing and repair of the system, must be performed by a certified fire protection technician. Complete records must be kept for at least one year, as well as the ability to create these maintenance records upon request.
It is recommended to use sprinkler inspection companies that can service all your locations so that records are easily accessible from a single unit. By keeping these inspections up to date, you can avoid fire safety mistakes and rule violations. Because sprinklers are such an important part of your fire safety plan, it`s important to have them inspected and tested regularly to make sure they`re working optimally. If you`re a business owner or facilities manager, you may be wondering how often you should have your sprinkler systems inspected and tested. Construction and fire safety regulations governing the design and installation of these systems have also been developed to reduce the likelihood of system failure. The International Building Code, NFPA 5000, International Fire Code and Fire Code of NFPA 13 and NFPA 25 support NFPA 13 and NFPA 25 by reference; Therefore, their requirements apply in most jurisdictions in the United States. Fire protection system designers often need one year of availability for new installations, which requires the use of NFPA 25. Maintaining and testing sprinkler systems is an important step in this process that should never be ignored. In fact, without proper sprinkler maintenance, your sprinkler system may appear to be in working order and feel good once a year, but without lubrication, tightening loose bolts, cleaning and cleaning pipes, your sprinklers can have a reduced lifespan and may not work during a fire.
Be sure to follow the following sprinkler maintenance schedule to make sure your systems are working. • 3.3.24 Inspection. Visual inspection of a system or part of it to ensure that it appears to be in working order and free from physical damage. ESFR (Early Suppression Fast Response) refers to both a concept and a type of sprinkler. “The concept is that rapid sprinkler intervention in a fire can provide an advantage if the response is accompanied by an effective drainage density – that is, a sprinkler spray that can make its way through the fire plume in sufficient quantity to remove the burning fuel assembly.”  The sprinkler developed for this concept was developed for use in high-bay warehouses. Some states, including California, Pennsylvania and Illinois, require sprinklers in at least some new residential buildings.  For example, sprinklers, pipe fittings, pipe curtains and brackets must be visually inspected annually. Quarterly inspections are required for water flow switches.
These inspections are designed to identify damage, obstructions to water drainage, or other factors that may affect functionality. The requirement to assess the internal condition of pipelines, which is usually required every five years, is often overlooked. If significant amounts of foreign material clog the pipe or sprinklers, an investigation of the obstruction is required.