Wet pipe-sprinkler system

Wet pipe sprinkler system a system containing water that discharges through the opened sprinklers via heat. 

Wet-pipe Sprinkler System An automatic sprinkler system in which the pipes are constantly filled with water under pressure. 

The water supply to B6596 consists of a 6-inch riser in the mechanical equipment room that supplies water to the fire protection wet-pipe sprinkler system. Sprinkler heads have internal fusible elements that open the sprinkler flow orifice at a temperature of 165°F. Fire alarm pull stations and fire extinguishers are located in both the main facility and the Chapel. 

Zones 2 and 3 of the HCF are protected by an automatic wet-pipe sprinkler system. The sprinkler system is designed for Ordinary Hazard Group 2 occupancy. Therefore, this system will be able to accommodate any unforeseen increases in ordinary combustible loading. The HCF is below grade and will contain any firefighting water used. It is also equipped with heat... 

In all of these scenario variations, the fire suppression system composed of a wet pipe sprinkler system could limit fire progression and possibly the extent of the release. As the sensor that starts the sprinkler water flow is passive and located near the high ceiling level, The sprinkler system may not start promptly to suppress the fire. In that case it will be more of a mitigation feature than a prevention feature so it was not included in the event tree analysis of radioactive material release. 

The following is an abbreviated example of a failure mode and effects analysis on a simple wet pipe sprinkler system. Even though reliability data may be relatively accurate, it is provided for illustrative purposes only and should not be used for other purposes. 

The system being examined in the FMEA is the wet pipe sprinkler system for... 

The wet pipe sprinkler system consists of a single riser with water flow... 

Fi( ure 14-2 Wet pipe sprinkler system typical riser with water indicator. 

This fault tree analysis (FTA) of the wet pipe sprinkler system for the building at, , outlines the primary, secondary, and command failures of the system that would prevent it from extinguishing a fire in the facility. 

In summary, primary failures of wet pipe sprinkler systems are rare. Most systems fail because of secondary factors, llie only significant command failure is the intentional shutoff of the main water supply. 

This system hazard analysis of a wet pipe sprinkler system was conducted using fault tree analysis (FTA). 

Wet-Pipe Systems. This type of system contains water under pressure at all times water will be discharged immediately on operation of an automatic sprinkler. Water flowing from the wet-pipe sprinkler system actuates an alarm valve that gives off a signal. Hgnre 4.92 illustrates the total concept of the wet-pipe antomatic sprinkler system. 

The essential features of wet-pipe sprinkler systems, which represent about 80 percent of sprinkler installations, include provisions for water supplies, piping, and location and spacing of sprinklers. This system is generally used wherever there is no danger that the water in the pipes will freeze and wherever there are no special conditions requiring one of the other systems. Inspection of the wet-pipe sprinkler system at regular intervals is essential, and quarterly inspection of all water-control valves and water flow alarms is recommended. 

Wet Pipe. The wet pipe sprinkler system will be used in most cases. It has the water atthe head waiting forthe fire. It is most common and the least expensive. 

Mattresses in a 30-foot-high warehouse in Kansas became the cause of a fire because they were stored too close to a mercury vapor light. When the mattresses ignited, the fire activated the heat-detection system and wet-pipe sprinkler system. Firefighters used two 1 %-inch fire hoses to combat the fire, which was brought under control after one hour. Damage to the structure and contents totaled 605,000. 

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