1、|BRITISH STANDARDBS EN12056-4:2000The European Standard EN 12056-4:2000 has the status of aBritish StandardICS 91.140.80NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWGravity drainagesystems insidebuildings Part 4: Wastewater lifting plants Layout and calculationThis British S
2、tandard, havingbeen prepared under thedirection of the SectorCommittee for Building and CivilEngineering, was published underthe authority of the StandardsCommittee and comes into effecton 15 September 2000 BSI 09-2000ISBN 0 580 36442 9BS EN 12056-4:2000Amendments issued since publicationAmd. No. Da
3、te CommentsNational forewordThis British Standard is the official English language version of EN 12056-4:2000.The UK participation in its preparation was entrusted by Technical CommitteeB/505, Wastewater engineering, to Subcommittee B/505/21, Roof drainage andsanitary pipework, which has the respons
4、ibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on theinterpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgatethem in the UK.A list of organization
5、s represented on this subcommittee can be obtained on requestto its secretary.Cross-referencesThe British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled “International Standards Corres
6、pondence 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 acontract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of
7、itself confer immunityfrom legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page,pages 2 to 19 and a back cover.The BSI copyright notice displayed in this document indicates when the documentwas last issued.EUROPEAN STANDARDNORME EUROPENNEE
8、UROPISCHE NORMEN 12056-4June 2000ICS 91.140.80English versionGravity drainage systems inside buildings - Part 4: Wastewaterlifting plants - Layout and calculationRseaux dvacuation gravitaire lintrieur des btiments -Partie 4: Stations de relevage deffluents - Conception etcalculsSchwerkraftentwsserun
9、gsanlagen innerhalb vonGebuden - Teil 4: Abwasserhebeanlagen - Planung undBemessungThis 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 EuropeanStandard the status of a n
10、ational standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 a
11、ny other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany
12、, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCentral Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of
13、 exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12056-4:2000 EPage 2EN 12056-4:2000 BSI 09-2000ContentsPageForeword . 31 Scope . 32 Normative references . 33 Definitions, symbols, units and designation . 43.1 Definitions 43.1.1 Wastewater lifting pla
14、nt. 43.1.2 Backflow . 43.1.3 Flood level 43.1.4 Backflow loop 43.1.5 Duty flow, PGb7V 43.1.6 Discharge head, Hp. 43.1.7 Collection tank for wastewater containing faecal matter. 43.1.8 Useful volume . 43.2 Symbols . 54 Protection against backflow 55 Installation. 75.1 General requirements 75.2 Pipewo
15、rk 75.3 Ventilation 105.4 Drains 105.5 Electrical connections 106 Selection of wastewater lifting plants. 106.1 Determination of flow, QP. 106.2 Determination of head, Hp106.2.1 Calculation procedure for head, Hp. 116.2.2 Static head, Hgeo. 116.2.3 Losses in valves and fittings, HV,A. 126.2.4 Fricti
16、on losses in discharge pipework, HV,R. 136.3 Determination of useful volume, V. 147 Commissioning. 168 Inspection and maintenance . 168.1 Inspection 168.2 Maintenance 168.3 Maintenance contract 16Annex A (informative) 17Bibliography 19Page 3EN 12056-4:2000 BSI 09-2000ForewordThis European Standard h
17、as been prepared by Technical Committee CEN/TC 165 “Waste water engineering“, thesecretariat 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 orby endorsement, at the latest by December 2000, and conflicting n
18、ational standards shall be withdrawn at the latestby 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 requ
19、irementsPart 2: Sanitary pipework - Layout and calculationPart 3: Roof drainage - Layout and calculationPart 4: Wastewater lifting plants - Layout and calculationPart 5: Installation and testing, instructions for operation, maintenance and useAccording to the CEN/CENELEC Internal Regulations, the na
20、tional standards organizations of the followingcountries 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 S
21、copeThis part gives layout, operation and maintenance requirements for lifting plants for wastewater containing faecalmatter, faecal-free wastewater and rainwater within buildings and sites, together with their discharge pipework andconnection to drain. It also covers faecal wastewater lifting plant
22、s for limited applications.2 Normative referencesThis standard incorporates by dated or undated reference provision from other publications. These normativereferences are cited at the appropriate places in the text and the publications are listed hereafter. For datedreferences, subsequent amendments
23、 to or revisions to any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references the latest edition of the publication referredto applies.EN 1085Wastewater treatment - VocabularyprEN 12050-1Wastewater lifting plants for buildi
24、ngs and sites - Principles of construction and testing - Part 1: Lifting plants forwastewater containing faecal matterprEN 12050-2Wastewater lifting plants for buildings and sites - Principles of construction and testing - Part 2: Lifting plants forfaecal-free wastewaterprEN 12050-3Wastewater liftin
25、g plants for buildings and sites - Principles of construction and testing - Part 3: Lifting plants forwastewater containing faecal matter for limited applicationsprEN 12050-4Wastewater lifting plants for buildings and sites - Principles of construction and testing - Part 4: Non-return valvesfor faec
26、al-free wastewater and wastewater containing faecal matterEN 12056-1Gravity drainage systems inside buildings - Part 1: General and performance requirementsPage 4EN 12056-4:2000 BSI 09-2000EN 12056-2Gravity drainage systems inside buildings - Part 2: Sanitary pipework - Layout and calculationEN 1205
27、6-3Gravity drainage systems inside buildings - Part 3: Roof drainage - Layout and calculationEN 12056-5Gravity drainage systems inside buildings - Part 5: Installation and testing, instructions for operation, maintenanceand use3 Definitions, symbols, units and designationFor the purposes of this sta
28、ndard, EN 1085 and the following definitions and symbols apply:3.1 Definitions3.1.1 wastewater lifting plantdevice for the collection and automatic lifting of wastewater, which may or may not contain faecal matter, to aheight above flood level3.1.2 backflowflow of wastewater from a drain or sewer ag
29、ainst the direction of flow back into the connected pipework3.1.3 flood levelthe maximum level to which waste water can rise within a drainage system3.1.4 backflow looppart of the pressurized pipework from a wastewater lifting plant above flood level (see Figures 1 and 2)3.1.5 duty flow, PGb7Vflow d
30、ischarged 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, Hppressure produced by the pumping device of a wastewater lifting plant at the duty point to overcome the staticheight difference plus the total losses in the d
31、ischarge pipework (see Figure 6)3.1.7 collection tank for wastewater containing faecal matterunpressurized part of a wastewater lifting plant in which the incoming wastewater is stored prior to lifting3.1.8 useful volumevolume in the collection tank between switch-on level and switch-off level that
32、can be liftedPage 5EN 12056-4:2000 BSI 09-20003.2 SymbolsTable 1 SymbolsSymbol Unit Definitiondimm Inside diameterDN mm Nominal sizeg m/s2Gravitational constant (= 9,81 m/s2)Hgeom Static headHPm Discharge head of pumping device at duty pointHtotm Total headHVm Head lossHV,Am Loss in valves and fitti
33、ngsHV,jG2d Dimensionless head loss as a function of pipe lengthHV,Rm Friction loss in discharge pipeworkL m Pipeline lengthPVbar (N/m2) Pressure lossQi(Gb7V )l/s Wastewater inflowQ ( AGb7V )l/s Flow generallyQP( PGb7V )l/s Duty flow of pumping deviceQR( RGb7V )l/s Rainwater dischargeT s Minimum runn
34、ing timeV l Useful volumev m/s Flow velocity G2d Resistance factor4 Protection against backflowEven when a public drain or sewer system is designed in accordance with generally approved calculation methodsand carefully maintained, it cannot, for economic reasons, be sized to be able to discharge the
35、 unusually largequantities of water which may arise during a heavy storm. Under these conditions surcharge the connecting drainsand 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.
36、In addition, failure of a pumping station can cause a sewer to surcharge. For these reasons, sanitary appliances belowflood level shall be adequately protected against backflow. If no other information is available, in generally flat areasthe level of the highway1at the point where the drain connect
37、s 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
38、 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 beaffected in the case of flooding, and;- the number of users is small and a WC is available above flood level, and;- sanitary a
39、ppliances do not need to be used during flooding.1“highway” refers to the road, pathways, roadside shoulders, etc.Page 6EN 12056-4:2000 BSI 09-2000Figure 1 Illustration of protection againstbackflow where the drain or sewer is higherthan the sanitary appliancesFigure 2 Illustration of protection aga
40、instbackflow by means of a wastewater liftingplant where there is a fall to the drain orsewerPage 7EN 12056-4:2000 BSI 09-2000Figure 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 sewer5 Installation5.1
41、 General requirementsWastewater lifting plants shall be installed so that rotation is prevented. Wastewater lifting plants that might be subjectto flotation shall be fastened down.Rooms containing wastewater lifting plants shall be of sufficient size to give a working space of at least 600 mmaround
42、and above all operating parts or components that may need maintenance. Rooms shall be adequately lit andwell 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.Collectio
43、n tanks for wastewater containing faecal matter shall not be structurally connected to the building. Where afaecal 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
44、 where the wastewater inflowcannot be interrupted.Surface water drainage of areas below flood level shall be kept separate from domestic wastewater and pumpedaway using a wastewater lifting plant installed outside the building.5.2 PipeworkSanitary pipework below flood level and draining to a wastewa
45、ter lifting plant shall be designed and installed inaccordance with EN 12056.All pipework shall be installed so that it is self-draining and shall not be restricted or reduced in diameter in thedirection of flow. The minimum size of discharge pipework shall be in accordance with Table 2.Page 8EN 120
46、56-4:2000 BSI 09-2000Table 2 Minimum size of discharge pipeworkType of wastewater lifting plant Minimum size ofdischarge pipeworkNon-macerating faecal lifting plant to prEN 12050-1Macerating faecal lifting plant to prEN 12050-1Faecal-free lifting plant to prEN 12050-2Non-macerating faecal lifting pl
47、ant for limitedapplications to prEN 12050-3Macerating faecal lifting plant for limited applications toprEN 12050-3DN 80DN 32DN 32DN 25DN 20All pipework connected to a lifting plant shall be installed so that it is not under stress and shall be adequatelysupported.An isolating valve shall be installe
48、d on the inlet of the wastewater lifting plant and also on the discharge side afterthe non-return valve. For wastewater lifting plants to prEN 12050-2 or prEN 12050-3 with discharge pipework lessthan DN 80, the isolating valves may be omitted provided that any non-return valve has a backwash device
49、orsome 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 (seeFigures 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 4and 5) and never to a stack.Di
