BS 5572:1994

Committees responsible
Foreword
Code of practice
1. Scope
2. References
3. Definitions
4. Exchange of information
4.1 General
4.2 Statutory requirements
5. Performance
5.1 General
5.2 Discharge
5.3 Hydraulics and pneumatics of discharge systems
6. Design
6.1 General
6.2 Traps
6.3 Discharge pipes and stacks
6.4 Ventilating pipes and stacks
6.5 Access
6.6 Materials
6.7 Special design considerations
7. Commonly used pipework arrangements; layout and
     sizing data
7.1 General
7.2 Commonly used arrangement of branch discharge pipes
7.3 Discharge stack, branch and ventilating pipe
     relationships for common arrangements of appliances
8. Pipe sizing using discharge unit method
8.1 General
8.2 Procedure
9. Work on site
9.1 Jointing of pipes
9.2 Support and fixing of pipes
9.3 Protection during building construction
10. Inspection and testing of completed installations
10.1 General
10.2 Final inspection
10.3 Testing
11. Maintenance
11.1 General
11.2 Cleaning and descaling
11.3 Periodic inspection
Annexes
A. (normative) Publications specifying materials,
     components and appliances
B. (informative) Examples of pipe sizing procedures
C. (informative) Bibliography
Tables
1. Equivalence between size as defined in this
     standard and as in other publications
2. Flow and usage data of some sanitary appliances
3. Trap seal loss data
4. Minimum sizes of tubular traps
5. Ventilating stack sizes (in millimetres) for
     commonly used arrangements of discharge stacks
     and swept entry branches
6. Discharge unit values and flow rates for common
     appliances
7. Maximum capacity and number of discharge units
     for vertical stacks
8. Maximum number of discharge units allowed on
     branch discharge pipe
9. General guide for the sizes of ventilating pipes
     and stacks
10. Maximum distance between pipe supports
11. Number of sanitary appliances to be discharged
     for performance testing
12. The chemical cleaning of discharge stacks and
     branches
Figures
1. Seal loss due to flow in branch pipes
2. Pressure effects and seal losses due to water flow
     in a discharge stack
3. Ventilated system
4. Ventilated stack system
5. single stack system
6. Modified single stack system
7. Trap types
8. Branch discharge pipe connections to discharge
     stacks
9. Prevention of cross flow
10. Discharge from stub stack
11. Offsets in discharge stacks
12. Termination of stack vents and ventilating stacks
13. Ventilating pipes to branches
14. Ventilating stacks
15. Access for cleaning and testing purposes
16. Branch discharge pipes for single WCs
17. Branch discharge pipes for single urinals
18. Branch discharge pipes for single wash basins
19. Branch discharge pipes for single baths and sinks
20. Combined branch discharge pipe arrangement for a
     bath and wash basin
21. Branch discharge pipes for washing and dish washing
     machines
22. Branch discharge pipes for ranges of WCs
23. Branch discharge pipes for ranges of urinals
24. Branch discharge pipes for ranges of wash basins
25. Branch discharge pipes for ranges of spray tap
     basins (without plugs)
26. Common arrangements of discharge stacks and branches
27. Design flows for stacks serving mixed types of
     appliances with and without WCs
List of references

This standard gives recommendations on design and workmanship based on improved technology with emphasis on the sizing of pipework and calculation of discharge flows. A new clause in this revision deals with performance requirements expected of discharge pipe systems.