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ASSE 1012 2009

ASSE 1012 2009

$24.38

ASSE Standard #1012-2009 Performance Requirements for Backflow Preventers with Intermediate Atmospheric Vent

Published By Publication Date Number of Pages
ASSE 2009 24
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The devices covered by this standard are those which have functional capabilities for preventing both back-siphonage and back pressure and which can operate under continuous or intermittent pressure conditions. These devices have two (2) independently operating check valves separated by an intermediate chamber with a means for automatically venting it to the atmosphere and can be installed in the horizontal, vertical up or vertical down orientations. The check valves are force loaded to a normally closed position and the venting means is force loaded to a normally open position.

PDF Catalog

PDF Pages PDF Title
1 Section I
1.0 General
1.1 Application
1.2 Scope
1.3 Reference Standards
2 Section II
2.0 Test Specimens
2.1 Samples Submitted for Test
2.2 Samples Tested
2.3 Drawings
2.4 Rejection
13 Section III
3.0 Performance Requirements and Compliance Testing
3.1 Hydrostatic Testing of Complete Device
Figure 1
3.2 Hydrostatic Test of Downstream Check
14 3.3 Shock (Water Hammer) Test of the Device
3.4 Reseating Tightness of the Downstream Check
3.5 Reseating Tightness of the Upstream Check
15 3.6 Atmospheric Vent Valve Leakage
3.7 Backflow Through Upstream Check
Figure 2
16 3.8 Atmospheric Vent Open Pressures
3.9 Back Siphonage
T
able 1
Figure 3
Figure 4
Figure 5
17 Figure 6
3.10 Back Siphonage Back Pressure
3.11 Flow and Pressure Loss
18 T
able 2
3.12 Flow with Low Supply Pressure
3.13 Deterioration at Extremes of Manufacturer’s Temperature Range
19 Figure 7
Table 3
20 Section IV
4.0 Detailed Requirements
4.1 Materials
4.2 Markings
21 Section V
5.0 Definitions
22 Appendix A
A1.0 Installation Instructions

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ASSE 1012 2009
$24.38