Nfpa 13 Alarm Check Valve

An alarm check valve is basically a check valve with an alarm port.

Nfpa 13 alarm check valve. Any alarm check valve should be carefully tested examined and cleaned periodically in accordance with nfpa 25. The contractor doesn t want to provide an alarm check valve downstream of the dcva which is a wilkins model 350 as he find it to be redundant. If the bell alarm is electrical or connected to a fire alarm system per nfpa 72 and not mechanical i would approve a check valve. Backflow preventer chapter 13 check valves chapter 13 control valves weekly sealed chapter 13 control valves monthly locked supervised chapter 13 deluge valve 10 2 2 chapter 13 detection systems nfpa 72 detector check valves chapter 13 drainage quarterly 10 2 87 electric motor 10 2 98 chapter 8.

The nfpa 15 standard has equivalent lengths for valves and fittings based on the type of valve or fitting and the pipe size. Alarm valve is a double seated clapper check valve with grooved seat design which ensures positive water flow for alarm operation. It is one of two configurations used in a wet sprinkler system. Globe alarm check valve installation and maintenance guide important notes 1.

6 8 2 waterflow detection devices. 13 4 1 1 alarm valves and system riser check valves shall be externally inspected quarterly and shall verify the following. 6 8 2 1 wet pipe systems. A swing check valve can act as an alarm check valve for a wet pipe fire sprinkler system but only when that valve can sound an alarm.

The alarm apparatus for a wet pipe system shall consist of a listed alarm check valve or other listed waterflow. Either one must be inspected quarterly. Where a valve is installed in the connection between a dry pipe sprinkler riser and a quick opening device it shall be an indicating type valve that is sealed locked or electrically supervised in the open position. 7 2 4 5 move to 8 2 4 5 a check valve shall be installed between the quick opening device and the intermediate chamber.

It is most important to ensure a clean water supply free of debris and solid particles such as sand gravel or mud. If you have flow switches on each control valve nfpa 13 does not require additional alarm valves water motor alarm gongs or pressure switches. Will this installation without alarm check valve in the system riser still meet the requirements of nfpa 13. Then depending on the c value and the pipe inside diameter in relation to steel schedule 40 inside diameter there are factors to multiply the equivalent length by.

The other employs a riser check valve. Alarm check valves and dcva sprinklerdesigner2 mechanical 12 feb 08 08 37. The main purpose of the alarm check valve is to ring a mechanical bell called a water motor gong.