In contrast, the Type B pre-controlled sprinkler system is a dry system, for which the alarm station is activated either through an automatic fire alarm system or through a drop in pressure in the sprinkler piping network. This system type can be installed in places where a false activation of the system could lead to considerable damage from the extinguishing water. Water is only released after the activation of a sprinkler. This system type is a dry sprinkler system in which the alarm valve station is first activated through an automatic fire alarm system and not through the opening of a sprinkler and the flooding of the piping network. The size of tandem systems is extremely limited. Tandem systems are wet systems which are installed downstream to pressurised pipelines via one or several dry alarm valves for areas susceptible to frost or high temperatures e.g. However, the different specifications in the guidelines for dry systems must be followed as closely as possible. If a sprinkler opens in the event of a fire, the pressurised air first escapes and the dry alarm valve then releases the extinguishing water to the sprinklers. The sprinkler piping network for this system type is then filled with pressurised air. Wet systems should only be used in places which are not exposed to a freezing or overheating (+95 ☌) of the extinguishing water in the piping network during the year.ĭry systems are only filled with water up to the dry alarm valve. The wet alarm valve simultaneously alerts a constantly manned station via a pressure switch alarm. Once the sprinkler system is activated, the extinguishing water flows over the wet alarm valve and the open sprinklers and targets the source of the fire. VdS, TRVB, FM or NFPA.įor wet systems, the entire piping network leading up to the sprinklers is filled with water. Today, ACCURO is in a position to design and construct sprinkler systems for any project and according to all standard regulations e.g. The company's strengths - expertise and committed employees coupled with flexibility - laid the foundations for ACCURO's success. Since the founding of the company, ACCURO has worked extensively in the area of sprinkler technology and has designed and constructed countless systems over the past few decades. Nowadays, sprinkler systems have naturally become more complex and efficient. The English and German word "sprinkler" stood and still stands for a functional unit consisting of a nozzle, a closure and a heat-dependent release mechanism. Over the years, a wide range of sprinkler systems were developed and successfully implemented in many different areas. Through the installation of an open piping network which could be manually pressurised with water in the event of a fire, lives and machinery could be protected effectively for the very first time. This technology stemmed from the American textile industry which often endured devastating fires due to the highly flammable material cotton. The development of the first sprinkler system dates back to the middle of the last century.