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ASSE 1012

Performance Requirements for Backflow Preventers with an Intermediate Atmospheric Vent

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Organization: ASSE
Publication Date: 11 March 2009
Status: active
Page Count: 24
scope:

Description

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.

Size Range

Inlet and outlet pipe sizes are 1/4 to 3/4 NPS (8 mm to 20 mm) inclusive.

Minimum Pressure Rating

The device shall be designed and constructed for a working pressure of at least 150.0 psi (1034.2 kPa).

Temperature Range

The device shall be designed and constructed for normal flow temperatures of 40.0 °F to 210.0 °F (4.4 °C to 98.9 °C) and an emergency back pressure temperature of 250.0 °F (121.1 °C).

Flow Rate

Manufacturer's advertised maximum flow rate.

Document History

ASSE 1012
March 11, 2009
Performance Requirements for Backflow Preventers with an Intermediate Atmospheric Vent
Description 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...
March 11, 2009
Performance Requirements for Backflow Preventers with an Intermediate Atmospheric Vent
Description 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...
September 1, 2002
Performance Requirements for Backflow Preventer with Intermediate Atmospheric Vent
A description is not available for this item.
September 1, 1993
Performance Requirements for Backflow Preventer with Intermediate Atmospheric Vent
A description is not available for this item.
January 1, 1993
Performance Requirements for Backflow Preventer with Intermediate Atmospheric Vent
A description is not available for this item.

References

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