Break tanks and mains water top-up

Clean water is of fundamental importance for human well-being. In many countries, public water supplies are therefore specially protected. The quality of water once it is drawn from the public supply system is no more defined. Therefore, it is necessary to ensure that water does not re-enter the mains network.

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WISY recommendations

For the separation of mains and service water

Sigura 9 break tank Sigura 9 break tank

Product information

Separating station Sigura 9

The SIGURA 9 separating station separates the points of use for process water from the public pipe network and thus protects the public drinking water from contamination. The drinking water backfeed is designed as a free outlet in accordance with DIN EN 1717 and DIN 1988-100.

The SIGURA 9 separating station is installed in the frost-free plant room, draws drinking water from the mains and feeds it under pressure into the service water network. It supplies up to 4.5 bar pressure in the service water network and is also suitable as a pressure booster system for buildings with up to three storeys.

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InfoImportant details

Standard-compliant separation from the public pipe network Complies with DIN EN 1717 and DIN 1988-100 Fully automatic function 35 l/min flow rate at 30 m delivery head Energy efficient

Product information

Separating station Sigura 350

The SIGURA 350 separating stations safely separate domestic hot water systems from the public mains supply using the standard-compliant free outlet type AF and build up the required operating pressure. The intermediate tank holds 350 litres and serves as a buffer to quickly provide the required volume flow in the domestic hot water system.

The pump is controlled by the Zeta 02 automatic switch and requires only 0.2 watts in standby mode. The pressure in the domestic hot water system is generated either by the Multigo 205 (80 l/min) or 407 (120 l(min) submersible pump.

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InfoImportant details

Standard-compliant separation of the service water network from the public pipe network Complies with DIN EN 1717 and DIN 1988-100 Optionally 80 or 120 l/min for large systems Energy efficient

Products for drinking water make-up

Separate mains and service water

Clean water is essential for people. This is why the public water supply enjoys special protection in many countries. The quality of water that has left the public supply system can no longer be controlled. It must therefore not be allowed to return to the mains water network from downstream systems.

Decalcify flower water

The safest way to prevent backflow is the free outlet. According to the standard, this is a "permanently unimpeded free flow path" for the water. It therefore falls freely downwards into an intermediate tank from which it cannot flow back.

A pump then builds up the required system pressure, which has dropped to ambient pressure through the free outlet. The volume of the intermediate tank, the type of pump and the pipe cross-sections are adapted to the desired pressure and volume ratio.

DIN EN 1717 AND DIN 1988-100

Throughout Europe, the requirements for the type of system separation are regulated by the EN 1717 standard. It has been adopted and supplemented for Germany by DIN EN 1717 and DIN 1988-100. Depending on the different qualities, categories are defined for liquids that can come into contact with mains water. The liquid categories are designated with the numbers 1 to 5. Category 1 corresponds to water for human consumption. Liquids with undefinable or unknown quality fall under category 5. Rainwater is water of Category 5 quality.

Separating devices according to standard

According to the quality category different devices for the connection of the water qualities are described. The devices are divided into types and designated with a combination of two letters.

Water category 5

According to the European standard, liquids of category 5 may only be used by means of free or open outlet of types AA, AB, AD, AF or, to a limited extent, type DC. The German standard gives concrete examples of apparatus whose liquid fall into this category. Examples of applications where a standard-compliant separation must be made are:

  • Tank filling, e.g. tank trucks
  • Sprinkler systems, underfloor systems
  • Fish tanks
  • Rainwater harvesting
  • Meat and fish processing machines
  • Galvanic plants
  • Glass rinsing equipment, e.g. at bar tables
  • Cooling circuits, cooling towers
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