EN 12056-2 2000 Gravity drainage systems inside buildings - Part 2 Sanitary pipework, layout and calculation.pdf

BRITISH STANDARD BS EN 12056 2 2000 The European Standard EN 12056 2 2000 has the status of a British Standard ICS 91 140 70 91 140 80 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Gravity drainage systems inside buildings Part 2 Sanitary pipework layout and calculationThis British Standard having been prepared under the direction of the Sector Committee for Building and Civil Engineering was published under the authority of the Standards Committee and comes into effect on 15 September 2000 BSI 09 2000 ISBN 0 580 36487 9 BS EN 12056 2 2000 Amendments issued since publication Amd No Date Comments National foreword This British Standard is the official English language version of EN 12056 2 2000 It supersedes BS 5572 1994 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee B 505 Wastewater engineering to Subcommittee B 505 21 Roof drainage and sanitary pipework which has the responsibility to aid enquirers to understand the text present to the responsible European committee any enquiries on the interpretation or proposals for change and keep the UK interests informed monitor related international and European developments and promulgate them in the UK The national annexes are an informative element of this British Standard and contain information provided for easier implementation of EN 12056 2 2000 in the United Kingdom within the framework envisaged by the scope of the European Standard Users are reminded that only the normative elements of the adopted European Standard set out the provisions to which it is necessary to conform in order to form part of a trade description when citing this British Standard by number or when compliance with it is claimed A list of organizations represented on this subcommittee can be obtained on request to its secretary Cross references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index or by using the Find facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover an inside front cover the EN title page pages 2 to 85 and a back cover The BSI copyright notice displayed in this document indicates when the document was last issued EUROPEAN STANDARD NORME EUROP ENNE EUROP ISCHE NORM EN 12056 2 June 2000 ICS 91 140 80 English version Gravity drainage systems inside buildings Part 2 Sanitary pipework layout and calculation R seaux d vacuation gravitaire l int rieur des b timents Partie 2 Syst mes pour les eaux us es conception et calculs Schwerkraftentw sserungsanlagen innerhalb von Geb uden Teil 2 Schmutzwasseranlagen Planung und Berechnung This European Standard was approved by CEN on 27 October 1999 CEN members are bound to comply with the CEN CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up to date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member This European Standard exists in three official versions English French German A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria Belgium Czech Republic Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROP EN DE NORMALISATION EUROP ISCHES KOMITEE F R NORMUNG Central Secretariat rue de Stassart 36 B 1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 12056 2 2000 EPage 2 EN 12056 2 2000 BSI 09 2000 Foreword 5 1 Scope 6 2 Normative references 6 3 Definitions 6 3 1 General 6 3 1 1 Waste water 6 3 1 2 Domestic waste water 7 3 1 3 Trade effluent 7 3 1 4 Grey water 7 3 1 5 Black water 7 3 1 6 Rainwater 7 3 1 7 Flood level 7 3 1 8 Drainage system 7 3 1 9 Combined system 7 3 1 10 Separate system 7 3 2 Pipes and fittings 7 3 2 1 Sanitary pipework 7 3 2 2 Nominal diameter DN 7 3 2 3 Internal diameter d i 7 3 2 4 External diameter d a 7 3 2 5 Minimum internal diameter d i min 7 3 2 6 Branch discharge pipe 7 3 2 7 Square entry 7 3 2 8 Swept entry 7 3 2 9 Connection bend 7 3 2 10 Discharge stack 7 3 2 11 Stack offset 8 3 2 12 Drain 8 3 2 13 Filling degree 8 3 3 Ventilating pipework 8 3 3 1 Ventilating pipe 8 3 3 2 Branch ventilating pipe 8 3 3 3 Stack vent 8 3 3 4 Ventilating stack 8 3 3 5 Air admittance valve 8 3 4 Appliances 8 3 4 1 Domestic sanitary appliances 8 3 4 2 Non domestic sanitary appliances 8 3 4 3 Floor gully 8 3 4 4 Trap 8 3 4 5 Depth of water seal H 8 3 5 Calculation 9 3 5 1 Discharge unit DU 9 3 5 2 Frequency factor K 9 3 5 3 Waste water flow rate Q ww 9 3 5 4 Continuous flow rate Q c 9 3 5 5 Pumped water flow rate Q p 9 3 5 6 Total flow rate Q tot 9Page 3 EN 12056 2 2000 BSI 09 2000 3 5 7 Hydraulic capacity Q max 9 3 5 8 Air flow rate Q a 9 4 System configurations 9 4 1 General 9 4 2 System types 10 4 3 Configurations 10 4 3 1 Primary ventilated system configurations 10 4 3 2 Secondary ventilated system configurations 11 4 3 3 Unventilated discharge branch configurations 12 4 3 4 Ventilated discharge branch configurations 13 5 Layout rules 14 5 1 Compliance with European Standards 14 5 2 Protection against flooding 14 5 3 Odour 14 5 4 Trap seal 14 5 5 Reduction of nominal diameter 15 5 6 Ventilation 15 5 7 Air admittance valves 15 6 Calculation 15 6 1 General 15 6 2 Basic data 15 6 2 1 Pipe diameter 15 6 2 2 Discharge units 15 6 2 3 Discharge from non domestic sanitary appliances 16 6 3 Calculation of flowrate 16 6 3 1 Waste water flowrate Q ww 1 6 6 3 2 Frequency factor K 1 6 6 3 3 Total flowrate Q tot 1 7 6 3 4 Calculation rules 17 6 4 Layout of branches 17 6 4 1 Unventilated discharge branches 17 6 4 2 Ventilated discharge branches 19 6 4 3 Air admittance valves for branches 22 6 5 Layout of discharge stacks 22 6 5 1 Primary ventilated discharge stacks 22 6 5 2 Secondary ventilated discharge stacks 23 6 5 3 Air admittance valves for stacks 23 6 5 4 Ventilating pipework 23 6 6 Layout of drains 24Page 4 EN 12056 2 2000 BSI 09 2000 6 6 1 General 24 Annex A informative 25 A 1 National and local regulations and practice 25 Annex B informative 30 B 1 Capacities of drains 30 B 2 Values of waste water flow rates 30 Annex C informative 32 C 1 Calculation example 32 C 2 Data and parameters 32 C 3 Sum of discharge units 32 C 4 Calculation of the stack size 33 C 5 Calculation of the drain sizes 33 Annex D informative 35 D 1 European Standards of commonly used products and additional European Standards in the field of waste water systems 35Page 5 EN 12056 2 2000 BSI 09 2000 Foreword This European Standard has been prepared by Technical Committee CEN TC 165 Waste water engineering the Secretariat of which is held by DIN This European Standard shall be given the status of a national standard either by publication of an identical text or by endorsement at the latest by December 2000 and conflicting national standards shall be withdrawn at the latest by June 2001 This is the second part in a series of the following five parts Part 1 General and performance requirements Part 2 Sanitary pipework layout and calculation Part 3 Roof drainage layout and calculation Part 4 Waste water lifting plants layout and calculation Part 5 Installation and testing of drainage systems instructions for operation maintenance and use According to the CEN CENELEC Internal Regulations the national standards organizations of the following countries are bound to implement this European Standard Austria Belgium Czech Republic Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland and the United Kingdom Page 6 EN 12056 2 2000 BSI 09 2000 1 Scope 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 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of publication referred to applies EN 12056 1 Gravity drainage systems inside buildings Part 1 General and performance requirements EN 12056 3 Gravity drainage systems inside buildings Part 3 Roof drainage layout and calculation EN 12056 4 Gravity drainage systems inside buildings Part 4 Waste water lifting plants layout and calculation EN 12056 5 Gravity drainage systems inside buildings Part 5 Installation and testing instructions for operation maintenance and use EN 752 Drain and sewer systems outside buildings prEN 12380 Ventilating pipework Air admittance valve systems AVS 3 Definitions For the purpose of this European Standard the following definitions apply 3 1 General 3 1 1 waste water water which is contaminated by use and all water discharging into the drainage system e g domestic and trade effluent condensate water and also rainwater when discharged in a waste water drainage systemPage 7 EN 12056 2 2000 BSI 09 2000 3 1 2 domestic waste water water which is contaminated by use and normally discharged from WC shower bath bidet wash basin sink floor gully 3 1 3 trade effluent water after industrial use and processes contaminated polluted water including cooling water 3 1 4 grey water waste water not containing faecal matter or urine 3 1 5 black water waste water containing faecal matter or urine 3 1 6 rainwater water resulting from natural precipitation that has not been deliberately contaminated 3 1 7 flood level the maximum level to which waste water can rise within a drainage system 3 1 8 drainage system a system composed of drainage equipment and other components collecting waste water and discharging by means of gravity effluent lifting plant may be part of a gravity drainage system 3 1 9 combined system a drainage system for both rain and waste water in a single pipe 3 1 10 separate system a drainage system for draining rain and waste water separately by dedicated pipework 3 2 Pipes and fittings 3 2 1 sanitary pipework arrangement of discharge pipework with or without ventilating pipes connected to a drainage system NOTE For the purposes of this standard pipework include pipes and fittings 3 2 2 nominal diameter DN numerical designation of size which is a convenient round number approximately equal to the diameter in mm 3 2 3 internal diameter d i mean internal diameter of the pipe barrel at any cross section 3 2 4 external diameter d a mean external diameter of the pipe barrel at any cross section 3 2 5 minimum internal diameter d i min smallest internal diameter allowed with maximum tolerance 3 2 6 branch discharge pipe pipe connecting sanitary appliances to a discharge stack or drain 3 2 7 square entry equal branch junction that is more than 45 or has a centre line radius less than the internal pipe diameter 3 2 8 swept entry equal branch junction that is at 45 or less or has a centre line radius not less than the internal pipe diameter 3 2 9 connection bend first fitting in direction of flow after trap outlet 3 2 10 discharge stack main generally vertical pipe conveying discharges from sanitary appliancesPage 8 EN 12056 2 2000 BSI 09 2000 3 2 11 stack offset non vertical part of a discharge stack 3 2 12 drain near horizontal pipe suspended within a building or buried in the ground to which stacks or ground floor appliances are connected 3 2 13 filling degree proportion of water depth h to the inside diameter d i 3 3 Ventilating pipework 3 3 1 ventilating pipe pipe provided to limit the pressure fluctuations within the discharge pipe system 3 3 2 branch ventilating pipe ventilating pipe connected to a branch discharge pipe 3 3 3 stack vent extension of a vertical discharge pipe above the highest branch discharge pipe connection that terminates in an end open to the atmosphere 3 3 4 ventilating stack Main vertical ventilating pipe connected to a discharge stack to limit pressure fluctuations within the discharge stack 3 3 5 air admittance valve valve that allows air to enter the system but not to escape in order to limit pressure fluctuations within the sanitary pipework 3 4 Appliances 3 4 1 domestic sanitary appliances fixed appliances supplied with water and used cleaning or washing For example baths showers wash basins bidets WCs urinals sinks dishwashers washing machines 3 4 2 non domestic sanitary appliances special sanitary appliances used in commercial kitchens laundries laboratories hospitals hotels swimming pools etc 3 4 3 floor gully discharge fitting intended to receive water from floors either through apertures in a grating or from pipes connected to the body of the gully A gully may include a trap 3 4 4 trap device that prevents the passage of foul air by means of water seal 3 4 5 depth of water seal H the depth of water which would have to be removed from a fully charged trap before gases and odours at atmospheric pressure could pass through the trap shown as H in Figure 1 Page 9 EN 12056 2 2000 BSI 09 2000 Figure 1 Water depth in trap 3 5 Calculation 3 5 1 discharge unit DU the average discharge rate of a sanitary appliance expressed in litres per second l s 3 5 2 frequency factor K variable to take into account the frequency of use of sanitary