Those with a pressure less than 1.0 bar are considered low pressure. Water systems which operate at 1.0 bar pressure (10 m of drop) or greater are considered high pressure systems. standards and specifications to fulfil all requirements for the type of work they do. The tradeoff is that they can fail at higher pressures. The documents below are updated and replaced from time to time. These valves are generally not affected unless the back pressure exceeds 30 or 35 of set pressure. Try to measure as accurately as possible, to the nearest metre.Įach metre of drop equates to 0.1 bar of pressure (see table below). For balanced bellows relief valves, the bellows mitigate the effects of back pressure up to a certain point. Don’t forget to allow for the depth of each floor too. If there are floors in between, measure the height from floor to ceiling and add this all together. You might find that this means measuring from your tap to your ceiling, and then from the floor of your loft to the bottom of the tank. Start by measuring the height between the bottom of your open or vented water tank and the outlet of your tap.
Stability problems in a WaterCAD/WaterGEMS model can also cause it to take longer to computer. The default is one hour, with a slightly smaller timestep such as 0.1 hours sometimes appropriate depending on the situation.
Or you can get a rough guide by measuring the drop between the tank and tap. Make sure your calculation timestep (under calculation options) is appropriate. To calculate the pressure, you can either ask a plumber to take a look, and they’ll use a pressure gauge tool, which you can also buy and use yourself. The water pressure is measured in bar, and the products designed for this pressure will be labelled accordingly. With low pressure water systems, it’s important to work out the water pressure to help you buy the correct shower or taps that can work effectively with the pressure you have.
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