Installed in the main water line serving a building, the Post Indicator Valve (PIV) is a valve used to control the water supply to the fire sprinkler system. Most commonly a raised post, the PIV is found in the yard near the building or mounted on the outside of the building.
What is the purpose of a PIV?
It provides a means of quick access and control to the water supply control valve so that water can quickly be provided or shut off accordingly, and which also has an indicator that shows whether the valve is open or shut.
What is a PIV position?
Post indicator valves (PIV) play an important role in a fire protection system, opening and closing the water supply from outside the building.
What is a wall PIV?
Also known as PIV, indicator post, I post, IP, post indicator, or wall post, a post indicator valve is a valve assembly used for the purpose of underground piping for water supply to fire protection systems such as sprinklers, sprays, foams, deluges, etc.Is a PIV required?
History of the PIV Requirement While not a referenced standard from the International Building Code, the International Fire Code requires that all private fire service mains be installed in accordance with NFPA 24 (IFC 2000-06 Section 508.2.
How does a PIV tamper switch work?
The tamper switch features an actuating unit, usually a lever or cable with a resting position. When the valve closes, the actuating unit breaks an electrical circuit which triggers a signal. Think of it like a light bulb: when the light switch is on, a circuit is formed and the bulb shines brightly.
Are tamper switches normally open or closed?
NO is Normally Closed or NO is Normally Open Once the switch made by the third party is installed inside the waterflow, tamper, or pressure switch assembly, the lever or piston may normally push the button and quit pushing when there’s an alarm or supervisory.
What is fire standpipe?
Standpipe systems consist of piping and hose connections installed throughout a building to provide reliable water for the manual suppression of a fire by either the fire department or trained personnel.What is air relief valve?
Air Release Valves, or Air Relief Valve function to release air pockets that collect at each high point of a full pressured pipeline. … This greater force opens the orifice whenever air pockets collect in the valve. Air Release Valves are essential for pipeline efficiency and water hammer protection.
What is a fire riser?Zurn Model FEZR in building Fire Commercial Risers are vertically mounted assemblies designed to connect a water supply line to a fire sprinkler system. Each unit consists of a Test and Drain Valve, a Water Flow Detector Switch, and a Pressure Gauge.
Article first time published onWhat is PIV control?
It typically involves two components: feedforward control, which adds auxiliary velocity and (in some cases) acceleration signals to the servo loop in order to improve command tracking, and either PID or PIV control, which works to maximize the system’s disturbance rejection. …
What is the difference between a 13 and 13R sprinkler system?
NFPA 13 protected buildings are considered ‘fully sprinklered’ to provide both life safety and protection to the facility and its assets. … Comparatively, NFPA 13R facilities are ‘partially sprinklered’ to provide life safety and a moderate level of building protection.
What is deluge valve?
A deluge valve is a type of system actuation valve that is opened by a detection system that is installed in the same areas as the spray nozzles or by remote manual operation supplying water to all spray nozzles.
Does a sprinkler system need to be monitored?
The short answer to this question is that pretty much anywhere a fire sprinkler system is required, monitoring is also required. And, even when an existing fire sprinkler system is not required, the system should still be monitored to ensure it will function as expected in the event of a fire.
What is the difference between pressure switch and flow switch?
Pressure Switches are activated when you reach a certain pressure: between 500-700 PSI. When the pressure meets this threshold, the switch is used to activate the burner for hot water. … Flow Switches are activated by the recognition of water flow. The pressure is usually lighter, lower than 500 PSI.
Where should a flow switch be installed?
The flow switch must be installed in the upright position as shown with arrow mark on side of casting in the same direction as fluid will flow.
Where should the outside local alarm bell be mounted?
Most fire alarm bells should be mounted at heights that place their tops above the floor at a height of at least 90 inches, or 7 1/2 feet, leaving at least 6 inches between the ceiling and the bell.
What are supervisory signal devices?
Per NFPA definition, a supervisory signal initiating device is “an initiating device such as a valve supervisory switch, water level indicator, or low air pressure switch on a dry-pipe sprinkler system in which the change of state signals an off-normal condition and its restoration to normal of a fire protection or …
What are supervisory switches?
What is a supervisory switch? Supervisory switches detect the status of a fire sprinkler system and relay that information to a central, proprietary, or remote monitoring center or sound a local alarm. To properly maintain a fire sprinkler system, you need information.
What is OS & Y gate valve?
OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve. … You can look at an OS&Y gate valve and tell if it is open or closed by the position of the stem.
What is the difference between air release valve and air relief valve?
The valve allows the rising liquid to force out air that occurs naturally in a piping system. … Furthermore, a relief valve won’t vent accumulated air at pressures below the set point. Unlike a pressure relief valve, an air release valve is open at atmospheric pressure, then closes automatically when liquid is present.
What is a globe valve?
A globe valve regulates flow in a pipeline. It is used to control or stop the flow of liquid or gas through a pipe. Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. … Globe valves are also known as throttle valves.
What is scour valve?
Scour valves are located at low points or between valved sections of the pipeline. Their function is to allow periodic flushing of the lines to remove sediment and to allow the line to be drained for maintenance and repair work.
What is class1 standpipe?
Class I standpipes serve a 2.5-inch fire hose connection for fire department use. These connections must match the hose thread utilized by the fire department and are typically found in stairwells of buildings.
Are standpipes wet or dry?
A “wet” standpipe is filled with water and is pressurized at all times. In contrast to dry standpipes, which can be used only by firefighters, wet standpipes can be used by building occupants. Wet standpipes generally already come with hoses so that building occupants may fight fires quickly.
Are standpipes required?
A Class I system is typically required in buildings that have more than three stories above or below grade because of the time and difficulty involved in laying hose from fire apparatus directly to remote floors. For these reasons, Class I standpipes are the required system in high-rise buildings.
What are risers in a building?
A vertical riser is any component that extends vertically through a building, including for example stairs and lifts, but the term is most commonly used to refer to ductwork, pipes, conduits and cables.
What is in riser room?
The riser room is the room or designated space where the control room of the fire sprinkler system is kept. … These system risers contain the pressure gauges, control valves, water flow alarms, and main drains for the sprinkler system.
Does a fire riser need to be enclosed?
You only need a door that opens directly to the outside if you have a fire pump in that room. NFPA states: Except as provided in 4.13. … 1.1, fire pump rooms not directly accessible from the outside shall be accessible through an enclosed passageway from an enclosed stairway or exterior exit.
How do you lubricate a post indicator valve?
Lubricate indicator post with oil via screw post at top of post. Opening or closing PIVs should take the same number of turns (±½). Ten inch valves will take ~ 31 to 34 turns. Six inch valves will take ~ 19 to 22 turns.
How does an FDC work?
When a sprinkler system activates, the fire department connects hose lines from a pumper truck to the fire department connection. This connection allows the fire department to supplement the fire protection system in the event of a fire.
