Marking & Identification of Pipework for Water Reuse Systems
Water reuse is an accepted method worldwide for reducing water demand.
Rainwater and greywater which is treated wastewater from showers, baths and sinks, are increasingly being collected and reused for applications which do not require wholesome water, such as laundry, WC flushing and garden watering. In addition to these, other sources of water such as blackwater (recycled sewage effluent) and industrial water are being considered for reuse.
The purpose of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws is to prevent waste, misuse, undue consumption, erroneous measurement and most importantly contamination of drinking water.
Contamination can occur as a result of backpressure or backsiphonage, both of which can cause contaminants to be drawn back up pipework into the water supply. Reused water, including that which has been treated, is considered to be fluid category 5 (the most dangerous of pollutants posing a serious health hazard) and must not under any circumstances be allowed to come into contact with the wholesome domestic drinking water supplies.
To reduce the risk of cross-connection and contamination of the wholesome water supply it is essential that all reused water pipework is both readily distinguishable from other pipework and instantly recognisable wherever it is located, for example inside a property, beneath the street, or on private land. So that accidental or deliberate operation, that could put the wholesome supply at risk, can be avoided all apparatus such as valves and washouts on systems distributing reused water should be suitably marked and significantly different from those normally used on wholesome water distribution networks.
Information Updated on: 2 February 2012
