ASSE - 1047
Performance Requirements for Reduced Pressure Detector Backflow Prevention Assemblies
| Organization: | ASSE |
| Publication Date: | 1 May 2021 |
| Status: | active |
| Page Count: | 36 |
scope:
Description
This standard applies to the two types of assemblies identified as:
a) Reduced Pressure Detector Assembly (RPDA).
b) Reduced Pressure Detector Assembly Type II (RPDA-II).
The RPDA and RPDA-II assemblies consist of 2 independently acting check valves, internally force loaded to a normally closed position, and separated by an intermediate chamber (or zone) in which there is a hydraulically operated relief means for venting to the atmosphere, internally force loaded to a normally open position. These assemblies are designed to operate under continuous pressure conditions. The assembly shall include 2 properly located, tightly closing shut-off valves per Section 1.3.2.7; and properly located test cocks per Section 1.3.2.5. The assemblies also include a bypass line which provides a visual or audible indication of system leakage or unauthorized use of water.
Pressure Rating
The maximum working pressure shall be at least 175 psi (1206.6 kPa).
Temperature Range
Assemblies for cold water applications shall be designed for a minimum temperature range of 33.0°F to 140.0°F (0.6°C to 60.0°C).
Assemblies for hot water application shall be designed for a minimum temperature range of 33.0°F to 180.0°F (0.6°C to 82.2°C).
Document History
