BS EN 12056-1:2000

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.

This European Standard applies to waste water drainage systems which operate under gravity. It is applicable for drainage systems inside dwellings, commercial, institutional and industrial buildings. The field of application of this European Standard is shown in Figure 1.

Differences in plumbing within Europe have led to a variety of systems being developed. Some of the major systems in use are described but this standard has not attempted to detail the intricacies of each system. Detailed information additional to that contained in this standard may be obtained by referring to the technical documents listed in annex A.

This first part of the standard establishes the general and performance requirements for waste water gravity drainage systems. It makes limited provision for pipework conveying trade effluent and for fluids removed by pumps.

All drawings in this standard are given as examples and are not intended to exclude any other system configuration.