SN EN 12056-1 : 2001

Foreword
1 Scope
2 Normative references
3 Definitions
      3.1 General
             3.1.1 Waste water
             3.1.2 Domestic waste water
             3.1.3 Trade effluent
             3.1.4 Grey water
             3.1.5 Black water
             3.1.6 Rainwater
             3.1.7 Flood level
             3.1.8 Drainage system
             3.1.9 Combined system
             3.1.10 Separate system
      3.2 Pipes and fittings
             3.2.1 Sanitary pipework
             3.2.2 Nominal diameter (DN)
             3.2.3 Internal diameter (di)
             3.2.4 External diameter (da)
             3.2.5 Minimum internal diameter (di min)
             3.2.6 Branch discharge pipe
             3.2.7 Square entry
             3.2.8 Swept entry
             3.2.9 Connection bend
             3.2.10 Discharge stack
             3.2.11 Stack offset
             3.2.12 Drain
             3.2.13 Filling degree
      3.3 Ventilating pipework
             3.3.1 Ventilating pipe
             3.3.2 Branch ventilating pipe
             3.3.3 Stack vent
             3.3.4 Ventilating stack
             3.3.5 Air admittance valve
      3.4 Appliances
             3.4.1 Domestic sanitary appliances
             3.4.2 Non-domestic sanitary appliances
             3.4.3 Floor gully
             3.4.4 Trap
             3.4.5 Depth of water seal (H)
      3.5 Calculation
             3.5.1 Discharge unit (DU)
             3.5.2 Frequency factor (K)
             3.5.3 Waste water flow rate (Qww)
             3.5.4 Continuous flow rate (Qc)
             3.5.5 Pumped water flow rate (Qp)
             3.5.6 Total flow rate (Qtot)
             3.5.7 Hydraulic capacity (Qmax)
             3.5.8 Air flow rate (Qa)
4 General requirements
      4.1 Energy and water consumption
      4.2 Gravity drainage
      4.3 Combined and separate systems
      4.4 National and local conditions
      4.5 Condensates
      4.6 Quality and quantity requirements of effluents
5 Performance requirements
      5.1 General
      5.2 Function
      5.3 Hygiene
      5.4 Safety
      5.4 Safety
             5.4.1 Prevention of spread of fire and smoke
             5.4.2 Water and gas tightness
             5.4.3 Location of pipework
      5.5 Flooding
             5.5.1 Flooding from the external drainage
                      system
             5.5.2 Flooding within the building drainage
                      system
             5.5.3 Flooding prevention
      5.6 Performance considerations
             5.6.1 Capacity of the system
             5.6.2 Noise
             5.6.3 Ventilation of the drainage system
             5.6.4 Durability
             5.6.5 Condensation
             5.6.6 Accessibility for inspection, testing
                      and maintenance
      5.7 Mechanical resistance and stability
             5.7.1 Chemical and physical resistance
             5.7.2 Stability during construction
             5.7.3 Stability during operation
      5.8 Frost protection
6 Testing
Annex A (informative)
      A.1 - National and local regulations and practice

Applies to waste water drainage systems operating under gravity. Applies to drainage systems inside dwellings and institutional, commercial and industrial buildings. Establishes the general and performance requirements for waste water gravity drainage systems. Makes limited provision for pipework conveying trade effluent and for fluids removed by pumps.