TS EN 12056-1

TS EN 12056-1 is the Turkish adoption of the part of the gravity drainage series that sets out the general principles and performance-oriented requirements for drainage systems inside buildings. It frames how internal waste water drainage should be understood as a functional system, rather than as isolated pipes or fittings, when flow depends on gravity instead of pumping.

What gravity drainage means in building services

In general technical terms, gravity drainage relies on pipe falls, flow capacity and system balance to move wastewater away from fixtures and collect it safely within the building. In building applications, this concept matters because drainage systems must transfer foul water, rainwater or similar waste water streams to the correct downstream connection without creating avoidable operational problems such as surcharge, backflow, loss of trap seal or nuisance odours.

The standard’s scope in practical terms

The standard applies to waste water drainage systems which operate under gravity and presents a performance-based framework. That means the subject is not only installation geometry; it is also the overall ability of the system to drain reliably, convey the intended flow and suit its intended use. Within the TS EN 12056 series, this part provides the shared general rules, while the other parts address related subtopics in more detail.

For designers and installers, the value of this standard lies in the common technical language it gives to building drainage: how a gravity-based system is defined, what performance concerns belong to it, and which broad engineering principles should guide the detailed design. It is therefore a general framework document for internal drainage systems rather than a component-specific product specification.