EN 12056-4 2000 Gravity drainage systems inside buildings - Part 4 Wastewater lifting plants - Layout and calculation.pdf

BRITISH STANDARD BS EN 12056 4 2000 The European Standard EN 12056 4 2000 has the status of a British Standard ICS 91 140 80 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Gravity drainage systems inside buildings Part 4 Wastewater lifting plants 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 36442 9 BS EN 12056 4 2000 Amendments issued since publication Amd No Date Comments National foreword This British Standard is the official English language version of EN 12056 4 2000 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 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 19 and a back cover The BSI 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UHVSRQVLELOLW RI D 1 PHPEHU LQWR LWV RZQ ODQJXDJH DQG QRWLILHG WR WKH HQWUDO 6HFUHWDULDW KDV WKH VDPH VWDWXV DV W KH RIILFLDO YHUVLRQV 1 PHPEHUV DUH WKH QDWLRQDO VWDQGDUGV ERGLHV RI XVWULD HOJLXP HFK 5HSXEOLF HQPDUN LQODQG UDQFH HUPDQ UHHFH FHODQG UHODQG WDO X HPERXUJ 1HWKHUODQGV 1RUZD 3RUWXJDO 6SDLQ 6ZHGHQ 6ZLW HUODQG DQG 8QLWHG LQJGRP 8523 1 200 77 25 67 1 5 7 21 20 7e 8523e 1 1250 6 7 21 8523b 6 6 20 7 h5 125081 HQWUDO 6HFUHWDULDW UXH GH 6WDVVDUW UXVVHOV 1 OO ULJKWV RI H SORLWDWLRQ LQ DQ IRUP DQG E DQ PHDQV UHVHUYHG ZRUOGZLGH IRU 1 QDWLRQDO 0HPEHUV 5HI 1R 1 Page 2 EN 12056 4 2000 BSI 09 2000 Contents Page Foreword 3 1 Scope 3 2 Normative references 3 3 Definitions symbols units and designation 4 3 1 Definitions 4 3 1 1 Wastewater lifting plant 4 3 1 2 Backflow 4 3 1 3 Flood level 4 3 1 4 Backflow loop 4 3 1 5 Duty flow P V 4 3 1 6 Discharge head H p 4 3 1 7 Collection tank for wastewater containing faecal matter 4 3 1 8 Useful volume 4 3 2 Symbols 5 4 Protection against backflow 5 5 Installation 7 5 1 General requirements 7 5 2 Pipework 7 5 3 Ventilation 10 5 4 Drains 10 5 5 Electrical connections 10 6 Selection of wastewater lifting plants 10 6 1 Determination of flow Q P 10 6 2 Determination of head H p 10 6 2 1 Calculation procedure for head H p 11 6 2 2 Static head H geo 11 6 2 3 Losses in valves and fittings H V A 12 6 2 4 Friction losses in discharge pipework H V R 13 6 3 Determination of useful volume V 14 7 Commissioning 16 8 Inspection and maintenance 16 8 1 Inspection 16 8 2 Maintenance 16 8 3 Maintenance contract 16 Annex A informative 17 Bibliography 19Page 3 EN 12056 4 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 part is the fourth in a series relating to the functional requirements of gravity drainage systems inside buildings There will be five parts as follows Gravity drainage systems inside buildings Part 1 General and performance requirements Part 2 Sanitary pipework Layout and calculation Part 3 Roof drainage Layout and calculation Part 4 Wastewater lifting plants Layout and calculation Part 5 Installation and testing 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 1 Scope This part gives layout operation and maintenance requirements for lifting plants for wastewater containing faecal matter faecal free wastewater and rainwater within buildings and sites together with their discharge pipework and connection to drain It also covers faecal wastewater lifting plants for limited applications 2 Normative references This standard incorporates by dated or undated reference provision 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 to 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 the publication referred to applies EN 1085 Wastewater treatment Vocabulary prEN 12050 1 Wastewater lifting plants for buildings and sites Principles of construction and testing Part 1 Lifting plants for wastewater containing faecal matter prEN 12050 2 Wastewater lifting plants for buildings and sites Principles of construction and testing Part 2 Lifting plants for faecal free wastewater prEN 12050 3 Wastewater lifting plants for buildings and sites Principles of construction and testing Part 3 Lifting plants for wastewater containing faecal matter for limited applications prEN 12050 4 Wastewater lifting plants for buildings and sites Principles of construction and testing Part 4 Non return valves for faecal free wastewater and wastewater containing faecal matter EN 12056 1 Gravity drainage systems inside buildings Part 1 General and performance requirementsPage 4 EN 12056 4 2000 BSI 09 2000 EN 12056 2 Gravity drainage systems inside buildings Part 2 Sanitary pipework Layout and calculation EN 12056 3 Gravity drainage systems inside buildings Part 3 Roof drainage Layout and calculation EN 12056 5 Gravity drainage systems inside buildings Part 5 Installation and testing instructions for operation maintenance and use 3 Definitions symbols units and designation For the purposes of this standard EN 1085 and the following definitions and symbols apply 3 1 Definitions 3 1 1 wastewater lifting plant device for the collection and automatic lifting of wastewater which may or may not contain faecal matter to a height above flood level 3 1 2 backflow flow of wastewater from a drain or sewer against the direction of flow back into the connected pipework 3 1 3 flood level the maximum level to which waste water can rise within a drainage system 3 1 4 backflow loop part of the pressurized pipework from a wastewater lifting plant above flood level see Figures 1 and 2 3 1 5 duty flow P V flow discharged by the pumping device of the wastewater lifting plant against the total head at the duty point see Figure 6 3 1 6 discharge head H p pressure produced by the pumping device of a wastewater lifting plant at the duty point to overcome the static height difference plus the total losses in the discharge pipework see Figure 6 3 1 7 collection tank for wastewater containing faecal matter unpressurized part of a wastewater lifting plant in which the incoming wastewater is stored prior to lifting 3 1 8 useful volume volume in the collection tank between switch on level and switch off level that can be liftedPage 5 EN 12056 4 2000 BSI 09 2000 3 2 Symbols Table 1 Symbols Symbol Unit Definition G i mm Inside diameter DN mm Nominal size J m s 2 Gravitational constant 9 81 m s 2 H geo m Static head H P m Discharge head of pumping device at duty point H tot m Total head H V m Head loss H V A m Loss in valves and fittings H V j Dimensionless head loss as a function of pipe length H V R m Friction loss in discharge pipework L m Pipeline length P V bar N m 2 Pressure loss 4 L V l s Wastewater inflow 4 A V l s Flow generally 4 P P V l s Duty flow of pumping device 4 R R V l s Rainwater discharge T s Minimum running time V l Useful volume Y m s Flow velocity Resistance factor 4 Protection against backflow Even when a public drain or sewer system is designed in accordance with generally approved calculation methods and carefully maintained it cannot for economic reasons be sized to be able to discharge the unusually large quantities of water which may arise during a heavy storm Under these conditions surcharge the connecting drains and the building drainage system has to be taken into account A similar situation can be caused by unplanned inflows blockages overloading or reductions in cross section In addition failure of a pumping station can cause a sewer to surcharge For these reasons sanitary appliances below flood level shall be adequately protected against backflow If no other information is available in generally flat areas the level of the highway 1 at the point where the drain connects to the sewer may be assumed to be the flood level Protection against backflow may be provided by a wastewater lifting plant with a backflow loop see Figures 1 and 2 Only a backflow loop will provide a high degree of security against backflow Alternatively an anti flooding valve may be used see Figure 3 provided there is a fall to the sewer and the rooms are of minor importance i e no valuable items are present and the health of the inhabitants will not be affected in the case of flooding and the number of users is small and a WC is available above flood level and sanitary appliances do not need to be used during flooding KLJKZD UHIHUV WR WKH URDG SDWKZD V URDGVLGH VKRXOGHUV HWF Page 6 EN 12056 4 2000 BSI 09 2000 Figure 1 Illustration of protection against backflow where the drain or sewer is higher than the sanitary appliances Figure 2 Illustration of protection against backflow by means of a wastewater lifting plant where there is a fall to the drain or sewerPage 7 EN 12056 4 2000 BSI 09 2000 Figure 3 Illustration of protection of a room of minor importance against backflow by means of anti flooding valve where there is a natural fall to the sewer 5 Installation 5 1 General requirements Wastewater lifting plants shall be installed so that rotation is prevented Wastewater lifting plants that might be subject to flotation shall be fastened down Rooms containing wastewater lifting plants shall be of sufficient size to give a working space of at least 600 mm around and above all operating parts or components that may need maintenance Rooms shall be adequately lit and well ventilated Where a faecal wastewater lifting plant to prEN 12050 1 is used a sump shall be provided All pipework connections to a wastewater lifting plant shall be noise absorbing Collection tanks for wastewater containing faecal matter shall not be structurally connected to the building Where a faecal wastewater lifting plant is used within a building it shall have a free standing collection tank In accordance with prEN 12050 1 duplicate pumping devices shall be installed in plants where the wastewater inflow cannot be interrupted Surface water drainage of areas below flood level shall be kept separate from domestic wastewater and pumped away using a wastewater lifting plant installed outside the building 5 2 Pipework Sanitary pipework below flood level and draining to a wastewater lifting plant shall be designed and installed in accordance with EN 12056 All pipework shall be installed so that it is self draining and shall not be restricted or reduced in diameter in the direction of flow The minimum size of discharge pipework shall be in accordance with Table 2 Page 8 EN 12056 4 2000 BSI 09 2000 Table 2 Minimum size of discharge pipework Type of wastewater lifting plant Minimum size of discharge pipework Non macerating faecal lifting plant to prEN 12050 1 Macerating faecal lifting plant to prEN 12050 1 Faecal free lifting plant to prEN 12050 2 Non macerating faecal lifting plant for limited applications to prEN 12050 3 Macerating faecal lifting plant for limited applications to prEN 12050 3 DN 80 DN 32 DN 32 DN 25 DN 20 All pipework connected to a lifting plant shall be installed so that it is not under stress and shall be adequately supported An isolating valve shall be installed on the inlet of the wastewater lifting plant and also on the discharge side after the non return valve For wastewater lifting plants to prEN 12050 2 or prEN 12050 3 with discharge pipework less than DN 80 the isolating valves may be omitted provided that any non return valve has a backwash device or some other means of emptying the discharge pipework into the collection tank is provided Discharge pipework from a wastewater lifting plant shall be installed to form a backflow loop above flood level see Figures 1 and 2 No other connections shall be made to the discharge pipework Discharge pipework from a wastewater lifting plant shall always be connected to a ventilated drain see Figures 4 and 5 and never to a stack Discharge pipeworks shall be connected to a drain in the same way as for a gravity connection Cleaning access to the drain shall be provided Discharge pipework shall be capable of withstanding 1 5 times the maximum operating pressure of the lifting plant Air admittance valves shall not be installed in the discharge pipework Page 9 EN 12056 4 2000 B