BS EN 12056-2:2000

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 Discharge stack
             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 System configurations
      4.1 General
      4.2 System types
      4.3 Configurations
             4.3.1 Primary ventilated system
                      configurations
             4.3.2 Secondary ventilated system
                      configurations
             4.3.3 Unventilated discharge branch
                      configurations
             4.3.4 Ventilated discharge branch
                      configurations
5 Layout rules
      5.1 Compliance with European Standards
      5.2 Protection against flooding
      5.3 Odour
      5.4 Trap seal
      5.5 Reduction of nominal diameter
      5.6 Ventilation
      5.7 Air admittance valves
6 Calculation
      6.1 General
      6.2 Basic data
             6.2.1 Pipe diameter
             6.2.2 Discharge units
             6.2.3 Discharge from non-domestic sanitary
                      appliances
      6.3 Calculation of flowrate
             6.3.1 Waste water flowrate (Qww)
             6.3.2 Frequency factor (K)
             6.3.3 Total flowrate (Qtot)
             6.3.4 Calculation rules
      6.4 Layout of branches
             6.4.1 Unventilated discharge branches
             6.4.2 Ventilated discharge branches
             6.4.3 Air admittance valves for branches
      6.5 Layout of discharge stacks
             6.5.1 Primary ventilated discharge stacks
             6.5.2 Secondary ventilated discharge stacks
             6.5.3 Air admittance valves for stacks
             6.5.4 Ventilating pipework
      6.6 Layout of drains
Annex A (informative)
      A.1 - National and local regulations and practice
Annex B (informative)
      B.1 - Capacities of drains
      B.2 - Values of waste water flow rates
Annex C (informative)
      C.1 - Calculation example
      C.2 - Data and parameters
      C.3 - Sum of discharge units
      C.4 - Calculation of the stack size
      C.5 - Calculation of the drain sizes
Annex D (informative)
      D.1 - European Standards of commonly used products and
            additional European Standards in the field of
            waste water systems

Applies to waste water drainage systems operating under gravity. Applicable to drainage systems inside dwellings and institutional, industrial and commercial buildings. Details principles to be followed both for layout and calculation.

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.

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 second part of the standard sets out principles which shall be followed for both layout and calculation. It makes limited provision for drainage systems conveying trade effluent and also makes limited provision for fluids removed by pumps.

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