Frequently asked questions

A static pressure reading alone doesn’t show how the installation will perform as demand changes. During commissioning, the installation should be assessed while all relevant appliances are operating at maximum simultaneous demand, along with checks of inlet and outlet pressure, appliance operation and other applicable requirements. 

A separate first- and second-stage arrangement may be appropriate where cylinders are a significant distance from the appliances, gas needs to travel through a longer supply line, or the system is designed with the second-stage regulator closer to the appliance load. reg content

An undersized regulator may appear to work normally at low demand, with problems only appearing when several appliances operate together. Signs can include reduced appliance performance, smaller or unstable flames, ignition or shutdown issues, and outlet pressure falling below the appliance manufacturer’s requirements.

The regulator should be sized for the total maximum demand of the installation, rather than looking at individual appliances on their own. This is particularly important where several appliances may operate at the same time.

Start by calculating the total maximum demand of the installation, including appliances that may operate simultaneously, in accordance with AS 5601 Appendix F. Pipe diameter, run length and allowable pressure loss also need to be considered. Bromic recommends sizing the regulator for the maximum calculated gas flow plus a 20% buffer.

A surface-mounted pump is installed externally, while a submersible pump is installed within the tank. The right option depends on the tank configuration, site conditions and performance required from the system.

No. Maximum flow rate alone does not show how a pump will perform under the conditions of the installation. The pump flow chart shows the relationship between flow and head and provides a better indication of expected performance.

Start with the outlets the system needs to supply and how many may be used simultaneously. Then check the required flow and pressure against the pump flow chart, taking into account factors such as property height and the distance the water needs to travel.

Consider the number and type of outlets, how many may operate at the same time, the required flow and pressure, whether the property is single or two-storey, the location of the tank, and whether a surface-mounted or submersible pump is required.

As part of commissioning, test the Rain to Mains switching function and confirm the system switches between rainwater and mains supply correctly. Check that mains water supply is available when required.