European Standard EN 12056-2:2002
EN 12056-2:2002 (Gravity drainage systems inside buildings – Part 2: Sanitary pipework, layout and calculation) was published in June 2000. It sets out the principles to be followed for layout and calculation for waste water drainage systems which operate under gravity.
The standard provides different options for handling primary and secondary ventilation and, for the first time within a standard, it specifies Air Admittance Valves (AAVs) as a legal alternative to the traditional pipe ventilation. Guidelines for the use of AAVs are detailed, including the requirement for them to comply with EN 12380.
EN 12056-2 provides a table based on the fixture units within the drainage system in order to calculate the required airflow. Studor developed the Airflow Calculator as a valuable tool to simplify the calculation process.
If you require any assistance designing your drainage system please contact our technical support team.