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ASSE 1047 2011

ASSE 1047 2011

$24.38

ASSE Standard #1047-2011 Performance Requirements for Reduced Pressure Detector Fire Protection Backflow Prevention Assemblies

Published By Publication Date Number of Pages
ASSE 2011 40
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The purpose of a Reduced Pressure Detector Fire Protection Backflow Prevention Assembly is to keep contaminated water from fire protection systems from flowing back into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the contaminated part of the system than in the potable water supply piping. These assemblies are designed to detect low rates of flow up to 2.00 GPM (0.13 L/s) caused by leakage or unauthorized use. This standards applies to Reduced Pressure Detector Assemblies (RPDA) and Reduced Pressure Detector Assemblies Type II (RPDA-II). The RPDA and RPDA-II assemblies consist of two (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 atmosphere, internally force loaded to a normally open position. These assemblies are designed to operate under continuous pressure conditions. The assembly shall include two (2) properly located, tightly closing shut-off valves and properly located test cocks. The assemblies also include a bypass line which provides a visual or audible indication of system leakage or unauthorized use of water.This standard also applies to Manifold Reduced Pressure Detector Assemblies consisting of two (2) or more complete RPDA or RPDA-II assemblies in parallel.

PDF Catalog

PDF Pages PDF Title
11 Section I
1.0 General
1.1 Application
1.2 Scope
12 Table 1
1.3 Limitations on Design
14 1.4 Reference Standards
16 Section II
2.0 Test Specimens
2.1 Samples Submitted for Test
2.2 Samples Tested
2.3 Drawings
2.4 Rejection
2.5 Manifold Assembly
17 Section III
3.0 Performance Requirements and Compliance Testing
3.1 Independence of Components
3.2 Hydrostatic Test of Complete Assembly
3.3 Seat Leakage Test for Shut-off Valves
18 3.4 Hydrostatic Backpressure Test of Bypass Check (for RPDA-II Assemblies
3.5 Hydrostatic Backpressure Test of Checks
3.6 Allowable Pressure Loss at Rated Flow
19 Figure 1
20 Figure 1A
21 3.7 Bypass Flow Detection
3.8 Relief Valve Opening Test
22 3.9 Sensitivity of Differential Pressure Relief Valve Test
3.10 Drip Tightness of First Check
23 3.11 Drip Tightness of Second Check
3.12 Drip Tightness of Bypass Check (for RPDA-II Assemblies
3.13 Relief Valve Discharge Test with Atmospheric Supply Pressure
24 3.14 Relief Valve Discharge with Positive Supply Pressure
25 Table 2
3.15 Backpressure/Backsiphonage Test
26 3.16 Relief Valve vs. Supply Pressure Fluctuation Test
3.17 Air Gap Device Backsiphonage Test
3.18 Deterioration at Manufacturer’s Extremes of Temperature and Pressure Ranges
27 Table 3
28 3.19 Cycle Test
3.20 Body Strength Test
29 3.21 Seat Adhesion Test
3.22 High Velocity Test
3.23 Field Evaluation Test for RPDA & RPDA-II Devices When Required by the
Authority Having Jurisdiction
31 Section IV
4.0 Detailed Requirements
4.1 Materials
32 4.2 Marking Instructions
33 4.3 Installation and Maintenance Instructions
34 .
viii Reduced Pressure Detector Fire Protection Backflow Prevention Assemblies
ASSE 1047-2011
Section V
5.0 Definitions
35 Appendix A – Installation Guidelines
A1.0 Recommended Installation Guidelines
A1.1 General
A1.2 Orientation
A1.3 Side Clearances

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ASSE 1047 2011
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