FM - 7745
Liquid Leak Detectors
| Organization: | FM |
| Publication Date: | 1 September 2021 |
| Status: | active |
| Page Count: | 22 |
scope:
This standard states testing and certification requirements for the following applications:
• hydrocarbon liquid leak detectors for above ground
• hydrocarbon liquid leak detectors for below ground
• water leak detectors
• water leak detectors based on water usage pattern
• water leak detectors for roof assemblies
• water supply shutoff valves based on leak detection
• water supply shutoff valves based on water usage pattern
This standard includes design and performance requirements for hydrocarbon leak detectors that can provide point, linear, or area detection of hydrocarbon liquid floating on the surface of water or pooling on a flat surface. The hydrocarbon leak detector shall be certified for the specific hydrocarbon liquid that it is claimed to be capable of detecting. Alternate test liquids (if any) will be determined as part of the certification examination.
This standard includes design and performance requirements for water leak detectors that can provide point, linear, or area leak detection for water pooling on flat surfaces or within the insulation surrounding pipes. Leak detectors can also be based on a meter that measures and profiles water usage. In addition, leak detector systems that include an optional valve to shut off water flow may also be evaluated with this standard.
This standard includes design and performance requirements for water leak detectors used in roof assemblies. This standard applies to two types of detection systems to detect water leakage through the roof membrane of a roof assembly. One type is constantly monitored using a control panel with sensors built into the roof assembly. The second type is performed by a technician conducting a scan of the roof surface using a low or high voltage electronic scanning system over the surface of the roof membrane. The manual scanning device is used to measure the electrical path between the wetted membrane and a conductive layer under the membrane.
Purpose
This standard states testing and certification requirements for hydrocarbon leak detectors and water leak detectors.
Testing and certification criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.
Document History