Flow: This flow rate is usually found by working out the volume of water that can flow compared to the time span.Example: A 6ltr bucket takes 6 seconds to fill up, so the flow rate has to be 1litre each second. Mains Gauge: An important gauge that provide gives an up to date pressure measurement for the cold water mains supply. Connects with a standard thread. Water Pressure: An example of water pressure can be the cylinder that holds the cold water in the loft. This vessel supplies outlets both up and downstairs. This pressure found downstairs will be higher, because of the greater distance downhill for the water to run. The bathroom sink however, is closer and not as far below for the water to run, so the pressure should be lower. Of course the whole pressure issue is dependant on the position or height of the cold-water cylinder. Example:If you were to open the nozzle on a hose just a bit, the speed or jet would be very fast, so the pressure is high. If you were to then, open the nozzle fully, the jet would die away somewhat as more water flowed and the pressure became lower. This though does mean that the flow rate of the water would be bigger. There is a device available that will measure the flow and the pressure. A professional plumber from Catford Plumbers will use them. This flow and pressure detail helps if planning a plumbing installation.The Weir Cup: The weir cup is carried by nearly all professional plumbers and looks like a jug kettle. The cup will take the flow rate readings. It is able to read both litres per second and gallons per minute. If the flow rate in a system requires reduction, then, the weir cup is used to measure, and accurately alter the rate of flow needed to fulfil an appliances operating specification. A professional tradesman like a Catford Plumber might need to confirm there is a strong enough flow rate for a condensing boiler.
