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ASSE 1048 2011

ASSE 1048 2011

$24.38

ASSE Standard #1048-2011 Performance Requirements for Double Check Detector Fire Protection Backflow Prevention Assemblies

Published By Publication Date Number of Pages
ASSE 2011 36
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The purpose of a Double Check Detector Fire Protection Backflow Prevention Assembly (herein referred to as the “assembly”) is to keep polluted water from fire protection systems from flowing into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the polluted part of the system than in the potable water supply piping. These assemblies are also designed to detect low rates of flow up to 2.00 GPM (0.13 L/s) caused by leakage or unauthorized use. This standard applies to Double Check Detector Assembly (DCDA) and Double Check Detector Assembly Type II (DCDA-II). The DCDA and DCDA-II assemblies consist of two (2) independently acting check valves, internally force loaded to a normally closed 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 Double Check Detector Assemblies consisting of two (2) or more complete DCDA or DCDA-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 DCDA-II Assemblies
3.5 Hydrostatic Backpressure Test of Checks
19 3.6 Allowable Pressure Loss at Rated Flow
Figure 1
20 Figure 1A
21 3.7 Bypass Flow Detection
3.8 Drip Tightness of First Check
22 3.9 Drip Tightness of Second Check
3.10 Drip Tightness of Bypass Check (for DCDA-II Assemblies
3.11 Deterioration at Manufacturer’s Extremes of Temperature and Pressure Ranges
23 Table 2
24 3.12 Cycle Test
25 3.13 Body Strength Test
3.14 Seat Adhesion Test
3.15 High Velocity Test
26 3.16 Field Evaluation Test for DCDA and DCDA-II Devices When Required by the
Authority Having Jurisdiction
27 Section IV
4.0 Detailed Requirements
4.1 Materials
28 4.2 Marking Instructions
29 4.3 Installation and Maintenance Instructions
30 Section V
5.0 Definitions
31 Appendix A – Installation Guidelines
A1.0 Recommended Installation Guidelines
A1.1 General
A1.2 Orientation
A1.3 Side Clearances

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ASSE 1048 2011
$24.38