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ASSE 1019

2011 Edition, July 1, 2011

Complete Document

Performance Requirements for Wall Hydrant with Backflow Protection and Freeze Resistance

Includes all amendments and changes through Reaffirmation Notice , 2016


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Description / Abstract:

Description

These devices shall have a permanent means to protect against backflow due to either backsiphonage or backpressure. The backflow protection shall include a minimum of two (2) mechanisms: an air inlet for preventing backsiphonage and a check valve for preventing backpressure backflow. These devices are terminal fittings that supply potable water to hose connections without danger of freezing.

These devices shall be used on systems where the only source of low head backpressure comes from an elevated hose equal to or less than 10.0 feet (3.0 meters) in height. The outlet of this device shall not be subjected to more than twelve (12) hours of continuous water pressure.

The devices shall be classified as follows:

(a) Type A devices protect against backsiphonage and backpressure. The backflow protection shall include three (3) mechanisms: 1) an air inlet for preventing backsiphonage, 2) a check valve for preventing backpressure backflow and 3) a mechanism that relieves backpressure backflow. The hose shall be removed to prevent damage to the device from freezing.

(b) Type B devices protect against backsiphonage and backpressure. The backflow protection shall include three (3) mechanisms: 1) an air inlet for preventing backsiphonage, 2) a check valve for preventing backpressure backflow and 3) a mechanism that relieves backpressure backflow and a mechanism that drains the water from the hydrant when the hose is attached and the hydrant is manually closed. The hose need not be removed to protect the device against damage from freezing.

(c) Type C devices protect against backsiphonage and backpressure. The backflow protection shall include two (2) mechanisms; 1) an air inlet for preventing backsiphonage and 2) a check valve for preventing backpressure backflow. The hose shall be removed to protect against damage to the device from freezing.