backflow prevention

What is a Backflow?

In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower etc. When pressure fails or is reduced, as may happen if a water main bursts, pipes freeze or there is unexpectedly high demand on the water system, then such reduced pressure in the pipe may allow contaminated water from the ground, from storage or from other sources to be drawn up into the system.

By definition, a Backflow is an undesirable reversal of flow of a liquid, gas or solid into the potable water supply. A Backflow Preventer keeps this from happening.

 

Back flow Prevention Devices:

The simplest, and a very effective way to provide Backflow prevention, is to provide an air gap. An air gap is simply an open space between any device that connects to a Plumbing system (like a valve or faucet) and any place where water can collect or pool.

Alternatively, a specialized Backflow preventer valve may be installed at strategic locations in the plumbing system wherever there is a risk of contaminated fluids entering the water supply pipes. A check valve is a common form of Back flow prevention, but more complex devices may instead be required.

 

Backflow Testing & Maintenance Program in Brisbane:

Registered Backflow protection devices must be tested as follows:

  • Immediately after installation;
  • Annually (at intervals not exceeding 12 months);
  • On completion of maintenance work;
  • After a Backflow or suspected Backflow incident;

The property owner is responsible for ensuring that the Backflow prevention device is tested annually, on completion of maintenance work, and after suspected Backflow incident(s) by an approved certifier.

Test tags must be securely fastened to each device and must have sufficient space for five test results to be recorded. The tag shall show:

  • Date of test;
  • Name of company;
  • Name and registered number of certified tester.

Tags must be of suitable material for a working life of at least five years without deterioration.

Backflow Prevention – Supply & Installation:

There are three types of Backflow protection installation methods. One or all methods may be used, depending on the Back flow prevention requirements of the property.

  1. Containment protection – device installed at the property boundary, just downstream of the meter assembly serving the property, including all fire services located at the boundary.
  2. Individual protection – device installed at point of potential contamination within the property.
  3. Zone protection – device isolates an area or building within the property.

The installation of a containment Backflow prevention device does not eliminate the need for individual and zone protection devices. Water downstream of a containment device is considered non-drinking water, if there are internal Backflow hazards remaining within the property. In these situations, the installation of individual and/or zone devices will be necessary to protect against the potential Back flow risk of these remaining hazards and so protect the drinking water downstream of a containment device.

Installation Conditions:

  • A licensed Plumber in Brisbane must install, commission and test all Backflow Prevention devices.
  • If the property has multiple new or relocated water services you will need suitable Backflow Prevention at the connection point for each service.
  • Devices are to be adequately supported and no part of any fitting or containment device is to be installed closer than the greater measurement of 5 pipe diameters or 300 mm from the meter outlet, whichever is greater.
  • Connections are not permitted between the meter outlet and the containment device.
  • Backflow Prevention devices must be accessible for maintenance and testing and must not be buried or installed in a pit or chamber.

For your BackFlow Prevention, Testing or Maintenance, please call the experienced AR Lake Plumbers now on

0408 294 801

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