Airgap Testing

Air gaps and break tanks are non-mechanical backflow prevention devices that are very effective where either backsiphonage or backpressure conditions may exist. Unless they are registered (see Chapter 7), air gaps and break tanks are considered suitable for Low Hazard installations only. For water services greater than DN 25, the minimum height of the air gap (the vertical distance between the water service and the spill level of the receiving tundish or break tank) is required to be not less than 2 times the diameter of the water service outlet (“2D”). This is explained in Figure 6.1. For air gaps in water services up to and including DN 25, the minimum height of the air gap is given in Table 4.6.3.2 of AS/NZS 3500.1, which is referenced by the PCA DTS Provisions in Parts B1 and B3.

An air gap, although an extremely effective backflow preventer when used to prevent backsiphonage and backpressure conditions, may cause a corresponding loss of pressure to downstream outlets. Consequently, air gaps are primarily used at end of line services where reservoirs or storage tanks are desired. When assessing whether an air gap would be suitable, the following points should be considered:

In a continuous piping system, each air gap requires the added expense of reservoirs (or break tanks) and secondary pumping systems, assuming gravity will provide adequate pressure.

The air gap may be easily defeated in the event the “2D” requirement was purposely or inadvertently compromised. Excessive splash may be encountered in the event that higher than anticipated pressures or flows occur. The splash may pose a nuisance or hazard, e.g. by creating undue noise or splashing water

Registered Air Gap

Is an approved method of achieving backflow compliance and is the unobstructed vertical distance through free atmosphere between the lowest opening of a water supply pipe and the highest possible water level in the receiving tank or vessel.

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Backflow Testing

Our plumbers can quickly and effectively test all your backflow prevention valves to ensure they’re working correctly and will continue to do so for the foreseeable future.

Inspection And Maintenance Report

After testing we complete all the necessary paperwork and report the state of your valves to your relevant water authority, ensuring you’re up to date and compliant for another year.

Service and installation

If we find your valves aren’t working as they should, our team can service, repair, or replace your valve, restoring it to working condition.

Here’s Why You Should Choose Us

For more than a decade Melbourne Backflow Testing Services have been helping people keep their backflow systems in working order. As professional, licensed plumbers, we’re qualified to handle any backflow testing for homes and businesses of all sizes. We provide comprehensive, competitively priced backflow valve testing solutions, helping you get the services you need for less. With friendly team members and a passion for quality service you put your confidence in the team at Melbourne Backflow Testing Services.

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Fixed Price Backflow Valve Testing, Competitive Servicing And Installation Rates

For professional backflow prevention, testing, repair, installation and more, call Melbourne Backflow Testing Services today. We offer competitive free quotes for all services, providing you with the service you need for less. If you have questions about our services or need advice from an experienced backflow plumber, we can answer any question you have.

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