Download text file (WetPipeAFFF.zip)

WET PIPE AFFF SPRINKLER SYSTEM
The sprinkler system shall be an overhead wet pipe AFFF foam sprinkler system. The system shall be designed to provide adequately proportioned foam water solution at listed water flows past the proportioning device. The system shall be installed in accordance with NFPA 16A, Standard for the Installation of Closed Head Foam-Water Sprinkler Systems, NFPA 11, Standard for Low Expansion Foam, NFPA 13, Standard for the Installation of Sprinkler Systems, and occupancy standards pertaining to the system installation.

SYSTEM DEVICES

System Design
(Insert applicable system design.)

Alarm Valve
The alarm valve shall be UL listed and FM approved. The alarm valve shall be equipped with a removable cover/clapper assembly for periodic inspection of clapper and seat assembly in accordance with NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems. The alarm valve shall be listed for installation in the vertical or horizontal position. The alarm valve shall be equipped with gauge connections on the system side and supply side of the valve clapper. The alarm valve shall be equipped with an external bypass to eliminate false alarms if water flow is less than that of the flow of a single fire sprinkler. Alarm valve trim piping shall be galvanized and listed and approved as part of the valve assembly. The alarm valve shall be constructed with a ductile iron body and be listed and approved for a maximum water working pressure of 250 PSI. The alarm valve shall be equipped with a pressure retard chamber as part of the alarm line trim. The alarm valve manufacturer is to be The Viking Corporation, and the Model shall be J-1.

Concentrate Controller (Proportioner)
The concentrate controller shall be a UL listed and FM approved device. The concentrate controller shall be listed and approved with the foam concentrate to be proportioned and the foam bladder tank. The concentrate controller shall be a brass wafer-type device. The concentrate controller shall be listed with a nominal orifice plate size for the foam concentrate to be proportioned. The concentrate controller manufacturer is to be Viking.

Foam Bladder Tank
The foam bladder tank employed in a low expansion foam system shall be an ASME code pressure vessel. The foam bladder tank utilized shall have been listed for use with the foam concentrate and proportioning method utilized. The foam bladder tank shall adhere to the requirements set forth in NFPA 11, Standard for Low-Expansion Foam and NFPA 16A, Standard for the Installation of Closed Head Foam-Water Sprinkler Systems. The foam bladder tank shall be UL listed and FM approved. Bladder tanks shall be Viking Horizontal or Vertical Bladder Tanks.

Concentrate Control Valve
Deluge valves that are utilized as concentrate control valves and are to be supplied by AFFF or AR-AFFF shall utilize a 90° pattern type of deluge valve manufactured with a corrosion resistant Halar coating. The concentrate control valve shall be externally resettable by hydraulic means. The concentrate control valve shall employ a pressure operated relief valve (PORV) on the priming line to release prime pressure from the top of the deluge valve. The PORV shall automatically reset and reprime the deluge valve once back pressure has been removed. The inlet and outlet connections of the deluge valve can be flanged by flanged, flanged by grooved, or threaded by threaded, respectively. The concentrate control deluge valve shall have a working pressure of not less than 250 PSI, unless listed for higher pressures. The concentrate control valve shall be primed with an indicating control valve followed by an inline strainer, check valve and a 1/16" restricted orifice in line prior to the inline PORV. Concentrate control valve trim shall be compatible and installed following the manufacturer's installation instructions. The Halar Coated Concentrate Control Deluge Valve manufacturer is to be The Viking Corporation. The Model shall be E-2 or E-4.

Foam Concentrate Piping
Foam concentrate piping shall be compatible with the foam concentrate to be used. The foam provider shall be consulted for acceptable materials of construction. Foam concentrate piping shall be designed for the least equivalent feet of pipe run from bladder tank discharge outlet to proportioning device and water supply to bladder tank. Excessive use of elbows and tees shall be avoided. Foam concentrate piping shall be substantially secured and restrained against movement, thrust, and vibration. Foam concentrate piping shall be protected from excessive heat and freezing temperatures. Foam concentrate piping shall be installed with a fitting such as a grooved coupling or union to be readily removed between the proportioning assembly and the concentrate control valve.

Foam Concentrate
Aqueous Film Forming Foam (AFFF) or Alcohol Resistant Aqueous Film Forming Foam (AR-AFFF) shall be utilized. Water-soluble liquids shall be protected with Alcohol resistant type foam concentrate. Foam concentrates shall be synthetic and shall be stored in accordance with the manufacturer's instructions. Foam concentrates shall be listed for use for the protection application imposed. Foam concentrates shall be listed and approved for the discharge outlets utilized in the protection scheme. Foam concentrates shall be listed and approved for use with Viking's Foam Proportioning System. Foam concentrates shall be Viking Synthetic Foam Concentrates.

Discharge Devices
Closed head sprinklers or nozzles that have been specifically tested and found suitable for the discharge of low expansion synthetic foam/water solution shall be installed. Standard sprinklers or closed head nozzles used for discharge outlets shall have been tested for minimum densities or minimum pressures as foam/water solution discharge outlets. Discharge devices shall be UL listed or FM approved for the application for which they are used. Closed head sprinklers and closed head nozzles shall be UL listed or FM approved for use with the foam and flammable liquid being protected. All sprinklers or nozzles that are to discharge foam/water solution shall be Viking sprinklers or nozzles.

Alarm Pressure Switch
Water flow will activate an alarm by way of an alarm pressure switch. The alarm pressure switch shall be compatible with system devices. The alarm pressure enclosure shall be UL listed and FM approved for the application in which it is used. The alarm pressure switch shall have the ability to be wired for Class A or Class B service. The alarm pressure switch shall be constructed with a ½" brass pressure connection. The alarm pressure switch manufacturer is to be The Viking Corporation, Part Number 09470 or 09471.

Sysetm Overhead Piping
Overhead sprinkler piping shall be in accordance with materials deemed acceptable by NFPA 13, Standard for the Installation of Sprinkler Systems, NFPA 16, Standard for the Installation of Deluge Foam-Water Sprinkler Systems, and all other applicable building standards.

System Control Valve
The low flow foam system control valve shall consist of a listed indicating type of control valve. The control valve shall be listed for use in fire protection systems. The control valve shall be rated for system working water pressure not less than 175 PSI.

Hangers and Supports
System piping shall be substantially supported from the building structure. The installation of hangers and supports shall adhere to the requirements set forth in NFPA 13, Standard for the Installation of Sprinkler Systems. Materials used in the installation or construction of hangers and supports shall be listed and approved for such application. Hangers or supports not specifically listed for service shall be designed and bear the seal of a professional engineer.

Fire Department Connection
A system fire department connection shall be provided on the system riser in accordance with NFPA 16, Standard for the Installation of Deluge Foam-Water Sprinkler Systems. The fire department connection shall be of a brass body with an integral clapper assembly to separate flow between inlets. The fire department connection shall be installed in an area accessible for the first response unit. The actual fire department connection shall be installed and located only after proper coordination with fire officials. The fire department connection shall be UL listed and FM approved for fire protection use.

Underground Piping
Piping and fittings used for the installation of underground water mains shall be listed for such service. Local water system requirements shall be adhered to. Compatible fittings and connection methods shall be reviewed with the water department authority. The standards of the AWWA and NFPA 24, Standard for the Installation of Private Fire Service Mains and Their Appurtenances shall be minimum installation guidelines.

Drains and Flushing Connections
System drains shall adhere to the requirements set forth in NFPA 13, Standard for the Installation of Sprinkler Systems. Flushing connections shall be provided where system piping is subject to accumulation of sediments or where periodic flushing is required by the Authority Having Jurisdiction. System auxiliary drains shall be installed so that the drain valve is accessible and labeled as a sprinkler system drain. Drains shall terminate to the exterior of the building where practical. Drains that do terminate to the exterior shall be installed with a 45° elbow directed to a splash block or other permanent erosion limiting material.

Riser Test Connections
A test connection shall be provided on the system riser with a downstream isolation valve for the purpose of testing foam proportioning. The system test header shall be of adequate size for at least a mid-range flow of the proportioning system. The system test header shall be installed with a means of draining any trapped sections of discharge piping subject to freezing.

System Supervision
Control valves larger than 2" in size shall be equipped with UL listed and FM approved supervisory switches. Control valves 2" and smaller shall be sealed in the position of their normal operating condition. Others shall execute the termination of supervisory switch wires. Supervisory switches shall be Potter Electrical Signal Company Control Valve Supervisory Switch.

System Commissioning
The foam water sprinkler system shall be tested in accordance with NFPA 11, NFPA 13, NFPA 16A and all other applicable codes and jurisdictions. An owner's representative, local fire officials, and a representative of the installing contractor shall witness foam-proportioning tests. Additional foam concentrate shall be provided for testing by the installing contractor. The installing contractor shall provide maintenance and material safety data sheets (MSDS) to the owner.

Foam Products
Concentrate Control Valve
Concentrates
Bladder Tank
Proportioners
Discharge Devices