SIST EN 14652:2006
(Main)Water conditioning equipment inside buildings - Membrane separation devices - Requirements for performance, safety and testing
Water conditioning equipment inside buildings - Membrane separation devices - Requirements for performance, safety and testing
This European Standard specifies requirements relating to the construction, performance and methods of testing for membrane separation systems with a particle rating below 1 mm, namely microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) for drinking water installations inside buildings, intended to remove from the drinking water marginal concentrations of suspended and colloidal solids, microorganisms, organic molecules and/or to reduce the dissolved solids concentration and applies to systems with a minimum pressure of PN 10, connections between DN 15 and DN 100 and a maximum working temperature of at least 30 °C.
This European Standard applies to membrane separation systems, whose elements may be partly or entirely cleanable or disposable in accordance with the type of system. It only concerns units which are permanently connected to the mains supply at the point-of-entry or the point-of-use.
A membrane separation system may include, together with the separation device pre- and /or post-treatment devices.
For the scope of this European Standard:
- separation device shall comply with this European Standard, i.e. without pre-and/or post-treatments;
- where pre-and/or post-treatment devices are incorporated in the system, each of them shall conform to the relevant standard. If this is the case, the complete system shall be considered as conforming as a whole.
Anlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Membranfilteranlagen - Anforderungen an Funktion, Sicherheit und Prüfung
Dieses Dokument legt die Anforderungen an die Konstruktion, Funktion und Prüfverfahren für Membranfilteranlagen mit einer Filterfeinheit von weniger als 1 mm, nämlich Mikrofiltration (MF), Ultrafiltration (UF), Nanofiltration (NF) und Umkehrosmose (RO), für Trinkwasser-Installationen innerhalb von Gebäuden zum Entfernen von Grenzkonzentrationen an suspendierten und kolloiden Feststoffen, Mikroorganismen, organischen Molekülen aus dem Trinkwasser und/oder zur Verringerung der Konzentration gelöster Feststoffe fest und gilt für Anlagen mit einem minimalen Nenndruck PN 10, Anschlüssen zwischen DN 15 und DN 100 und einer maximalen Betriebstemperatur von 30 °C.
Dieses Dokument bezieht sich auf Membranfilteranlagen, deren Bestandteile in Abhängigkeit von der Bauart der Anlage teilweise oder vollständig rückspülbar oder zum einmaligen Gebrauch bestimmt sein können. Es gilt nur für fest installierte Einheiten am Eintrittspunkt oder an der Entnahmestelle der Versorgungsleitung.
Eine Membranfilteranlage kann zusätzlich zur Filtervorrichtung Einrichtungen zur Vor- und/oder Nachbehand-lung enthalten.
Für den Anwendungsbereiches des vorliegenden Dokumentes muss
- die Filtervorrichtung diesem Dokument entsprechen, d. h. ohne Vor- und Nachbehandlungen;
- wenn Einrichtungen zur Vor- und/oder Nachbehandlung in der Anlage vorgesehen sind, jede einzelne der zutreffenden Norm entsprechen. Wenn das der Fall ist, muss die gesamte Anlage als Ganzes übereinstimmend angesehen werden.
Equipement de conditionnement d'eau a l'intérieur des bâtiments - Dispositifs de séparation membranaire - Spécifications de performances, de sécurité et essai
La présente Norme européenne s'applique aux systemes de séparation sur membrane dont le seuil de filtration est inférieur a 1 m, c'est-a-dire aux systemes de microfiltration (MF), d'ultrafiltration (UF), de nanofiltration (NF) et d'osmose inverse (OI), pour les installations d'eau potable a l'intérieur des bâtiments, dont le but est de retirer de l'eau potable une concentration marginale de matieres en suspension, de matieres colloidales, de micro-organismes, de molécules organiques, et de réduire la concentration de matieres dissoutes, avec une pression minimale égale a PN 10, des raccords entre 15 NS et 100 NS et une température de conception maximale d'au moins 30 °C.
Elle spécifie des exigences relatives a la construction, aux performances et aux méthodes d'essai.
Elle concerne uniquement des systemes qui sont connectés en permanence a l'alimentation principale au point d'entrée ou au point d'utilisation.
La présente norme s'applique aux systemes membranaires dont les éléments peuvent etre partiellement ou entierement lavables ou jetables, selon le type de systeme.
Un systeme de séparation sur membrane peut comporter des dispositifs de prétraitement et/ou de post-traitement en plus du dispositif de séparation.
Pour le domaine d'application de la présente norme :
le dispositif de séparation doit etre conforme a la norme, c'est-a-dire ne pas effectuer de prétraitement et/ou de post-traitement ;
dans le cas ou des dispositifs de prétraitement et/ou de post-traitement sont prévus, chacun d'eux doit etre conforme a la norme applicable. Dans ce cas, le systeme complet doit etre considéré comme conforme dans son ensemble.
Oprema, ki se uporablja za pripravo pitne vode v stavbah – Oprema za membransko filtracijo – Zahteve za delovanje, varnost in preskušanje
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Water conditioning equipment inside buildings - Membrane separation devices - Requirements for performance, safety and testingOprema, ki se uporablja za pripravo pitne vode v stavbah – Oprema za membransko filtracijo – Zahteve za delovanje, varnost in preskušanjeEquipement de conditionnement d'eau a l'intérieur des bâtiments - Dispositifs de séparation membranaire - Spécifications de performances, de sécurité et essaiAnlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Membranfilteranlagen - Anforderungen an Funktion, Sicherheit und PrüfungTa slovenski standard je istoveten z:EN 14652:2005SIST EN 14652:2006en91.140.60Sistemi za oskrbo z vodoWater supply systems13.060.20Pitna vodaDrinking waterICS:SLOVENSKI
STANDARDSIST EN 14652:200601-marec-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14652December 2005ICS 91.140.60 English VersionWater conditioning equipment inside buildings - Membraneseparation devices - Requirements for performance, safety andtestingEquipement de conditionnement d'eau à l'intérieur desbâtiments - Dispositifs de séparation membranaire -Spécifications de performances, de sécurité et essaiAnlagen zur Behandlung von Trinkwasser innerhalb vonGebäuden - Membranfilteranlagen - Anforderungen anFunktion, Sicherheit und PrüfungThis European Standard was approved by CEN on 8 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national 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 any 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14652:2005: E
EN 14652:2005 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Classification.11 5 Symbols and abbreviations.12 6 Construction requirements.13 6.1 General.13 6.2 Materials.13 6.3 Resistance to temperature.13 6.4 Resistance to hydrostatic pressure.13 6.5 Resistance to cyclic pressure.13 6.6 Backflow prevention.13 6.7 Electrical safety.13 6.8 Noise level.14 6.9 Air vent.14 6.10 End connections.14 6.11 Drain connections.14 6.12 Component replacement.14 6.13 Back-washable modules (MF and UF).14 7 Performance requirements.14 7.1 General.14 7.2 Hydraulic performance (applicable to MF, UF).14 7.3 Mechanical performance.15 7.4 Functional performance.15 8 Instruction and information.17 8.1 Installation, operation and maintenance instructions – Instruction manual.17 8.2 Marking and data plate.17 8.3 Performance data sheet.18 Annex A (normative)
Test methods.19 Annex B (informative)
Types of membrane.49 Annex C (informative)
Typical test reports.51 Bibliography.56
EN 14652:2005 (E) 3 Foreword This European Standard (EN 14652:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. 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 June 2006, and conflicting national standards shall be withdrawn at the latest by June 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14652:2005 (E) 4 Introduction With respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this European Standard, the following is pointed out to the user of this European Standard: 1) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; 2) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force.
EN 14652:2005 (E) 5 1 Scope This European Standard specifies requirements relating to the construction, performance and methods of testing for membrane separation systems with a particle rating below 1 µm, namely microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) for drinking water installations inside buildings, intended to remove from the drinking water marginal concentrations of suspended and colloidal solids, microorganisms, organic molecules and/or to reduce the dissolved solids concentration and applies to systems with a minimum pressure of PN 10, connections between DN 15 and DN 100 and a maximum working temperature of at least 30 °C. This European Standard applies to membrane separation systems, whose elements may be partly or entirely cleanable or disposable in accordance with the type of system. It only concerns units which are permanently connected to the mains supply at the point-of-entry or the point-of-use. A membrane separation system may include, together with the separation device pre- and /or post-treatment devices. For the scope of this European Standard: separation device shall comply with this European Standard, i.e. without pre-and/or post-treatments; where pre-and/or post-treatment devices are incorporated in the system, each of them shall conform to the relevant standard. If this is the case, the complete system shall be considered as conforming as a whole. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges EN 1092-2, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 2: Cast iron flanges EN 1254-1, Copper and copper alloys — Plumbing fittings — Part 1: Fittings with ends for capillary soldering or capillary brazing to copper tubes EN 1567, Building valves — Water pressure reducing valves and combination water pressure reducing valves — Requirements and tests EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987) EN ISO 3822 (all parts), Acoustics — Laboratory tests on noise emission from appliances and equipment used in water supply installations ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation
EN 14652:2005 (E) 6 ISO 304, Surface active agents — Determination of surface tension by drawing up liquid films ISO 1219-1, Fluid power systems and components — Graphic symbols and circuit diagrams — Part 1: Graphic symbols ISO 12103-1, Road vehicles — Test dust for filter evaluation — Part 1: Arizona test dust 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 accessible fabricated to be exposed for cleaning and inspection using standard available tools if necessary (e.g., screwdriver, pliers, open-end spanner) 3.2 air gap (drain system) unobstructed vertical distance through the free atmosphere between the outlet of the concentrated discharge pipe and the flood level rim of the receptacle into which it is discharging 3.3 air gap (water distribution system) unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet to a tank, plumbing fixture or other device, and the flood level rim of the receptacle 3.4 bubble point minimum pressure required to overcome the surface tension of the water filling the pores of the membrane 3.5 component separate or distinct part of a drinking water treatment system including, but not limited to, appurtenant accessories such as membranes, filters, housing, tubing, storage tanks, taps, valves, connectors to the feed water supply and connectors to the waste discharge line 3.6 contaminant any undesirable chemical or microbiological substance or parameter in drinking water 3.7 cross-flow filtration mode of operation by which part of the water passes through the membrane (product water) and the remaining part is rejected (reject water) NOTE 1 The reject water, which can be wasted or partly recycled, plays the major role of keeping the membrane surface clean. NOTE 2 Term "tangential flow" has the same technical meaning. 3.8 daily production volume of product water produced by the system per day 3.9 dead-end filtration mode of operation in which all the water feed passes through the membrane (no reject water). Depending on the rate of fouling/clogging of the membrane due to the retained substances, this filtration method is subject to declining rate of flow due to build up of retained matter. The membrane should be cleanable or disposable
EN 14652:2005 (E) 7 3.10 device complete, assembled, functional system 3.11 disposable component component that requires periodic replacement 3.12 drinking water water intended for human consumption as defined in Directive 98/83/EC 3.13 filtrate water which is obtained by passage through microporous membranes (MF, UF) 3.14 flow controller device for regulating the flow rate of water 3.15 grade of filtration minimum membrane particle or dissolved substances rating which expresses the ability of the membrane to retain dissolved or un-dissolved solids of a given size range under normal working conditions irrespective of the nature of the membrane material 3.16 manufacturer enterprise submitting the membrane module or the device for testing the compliance of that product to this European Standard 3.17 membrane structure intervening for separating two phases and/or acting as a selective barrier to the transport of matter between the phases adjacent to it NOTE It is categorised as membrane for MF, UF, NF or for RO in accordance with its construction and performance (see Annex B). 3.18 membrane flux flow rate characteristics through the membrane that are dependant upon applied pressure and water temperature expressed in volume of product water per surface area unit of membrane and time 3.19 membrane material material used for manufacturing membranes including organic (polymeric) and inorganic (ceramics, sintered metals or others) materials 3.20 membrane separation system water treatment system which includes membrane, pressure vessel, fittings, gauges and ancillaries and which may include pre- and post-treatment components 3.21 microfiltration process which removes particles of a size down to a given rating or a given molecular weight cut-off (MWCO) NOTE Annex B gives information on each type of membrane.
EN 14652:2005 (E) 8 3.22 module smallest practical membrane unit which can be directly manifolded to feed streams to separate a feed stream into a reject and a permeate stream once placed in an appropriate housing 3.23 module housing pressure vessel in which the module is accomodated NOTE The membrane is usually tested in its final configuration (module) inside its housing specified by the manufacturer. 3.24 nanofiltration process similar to reverse osmosis where the membrane has a looser structure thus reducing the rejection of monovalent ion 3.25 nominal flow rate flow rate of water produced, in litres per hour, expressed in relation to the parameters indicated by the manufacturer (namely operating pressure and pressure drop) NOTE In relation to the cross-flow mode of filtration it is also referred to as product or permeate flow rate. 3.26 operating pressure pressure specified by the equipment manufacturer to ensure the expected performance 3.27 permeability for a given fluid at given temperature (viscosity), it represents the flux of the given membrane as a function of the transmembrane driving force NOTE The permeability coefficient is defined by Darcy’s law. 3.28 permeate water which has passed through the membranes NOTE The term is currently used in general for membranes operating in the cross-flow mode, sometimes even MF and UF. 3.29 permanent pressure vessel vessel that contains the cartridge, membrane or media which may be replaced or regenerated at the end of each rated service cycle and has an estimated service life greater than one year 3.30 point-of-entry device water treatment system installed to treat the drinking water for the majority of the distribution system within the premises 3.31 point-of-use device water treatment system used to treat the drinking water at a single tap or multiple taps but not for the majority of the facility 3.32 post-membrane treatment additional treatment of the water subsequent to passage through the membrane(s)
EN 14652:2005 (E) 9 3.33 pre-membrane treatment any pre-treatment intended to protect the membrane in order to improve its performance and/or to prolong its lifetime 3.34 product water water that has been treated by the system after blending with untreated water, if applicable 3.35 recovery rate percentage measure of the amount of influent water which is delivered as permeate with open permeate discharge applicable to cross-flow mode The recovery rate is calculated by measuring the flow rate of the influent water and the product water (permeate) in accordance with Equation (1): 100fp×=QQY (1) where Y
is the recovery rate, in %; Qp is the product water flow rate, in m3/h; Qf is the influent water flow rate, in m3/h. 3.36 rejection rate mean percentage of the un-dissolved particles and of the ionic and molecular (organic) substances removed by the membrane depending on the operating condition as well as on the type of membrane used The rejection rate is calculated in accordance with Equation (2): 100)fp1(CCR−= (2) where R is the rejection rate, in %; Cf is the feed solution concentration of the considered substance; Cp is the filtrate/permeate solution concentration of the considered substance. 3.37 reject water portion of the influent water which is drained to waste 3.38 reference filtration rating dimension, in micrometers, of particles at which the overall average cumulative filtration efficiency of a membrane module tested in accordance with the procedure described in A.3.1, is greater than or equal to 99,8 %
EN 14652:2005 (E) 10 3.39 reverse osmosis process that reverses, by the application of pressure, the flow of water in a natural process of osmosis so that water passes from a more concentrated solution to a more diluted solution through a semi-permeable membrane 3.40 service cycle frequency of servicing (including replacement of disposable components of the system) required to maintain optimum performance 3.41 size range contaminant rejection range which, dependent upon the intended function of the membrane, may refer to the size of suspended or colloidal particles and/or to the molecular weight of organic dissolved substances or to the ionic species to be removed 3.42 total dissolved solids (TDS) remaining solids from a filtrate evaporated to dryness and dried to a constant weight at 180 °C after passing through a 0,45 µm filter 3.43 transmembrane differential pressure pressure expressed as a function of Pi and Ps and calculated by Equation (3): ()p0tm2/PPPPi−+=
(3) where Ptm
is the transmembrane differential pressure; Pi
is the pressure at the inlet of the module; Po
is the pressure at the outlet of the module; Pp
is the pressure of the permeate solution. 3.44 turbidity condition caused by the presence of suspended matter, or colloidal matter, or both, which results in the scattering and absorption of light rays 3.45 ultra-filtration process which removes dissolved large organic molecules in the size range of approximately 20 000 g/mol to 200 000 g/mol (1 g/mol = 1 Dalton) NOTE The nominal efficiency is referred as cut-off range. 3.46 unit void volume total water holding volume of a treatment system with the replaceable treatment components and disposable components in place
EN 14652:2005 (E) 11 3.47 unit volume total water holding volume of a treatment system with replaceable treatment components and disposable components removed 3.48 cleanable component component which can be restored to its original, or close to its original, performance by washing in accordance with the manufacturer's instructions. Recovery may progressively deteriorate after successive washings, requiring ultimate replacement. The manufacturer supplies information on how to check the recovery and on criteria for disposal 4 Classification The membrane separation devices are classified according to the following criteria: a) membrane material: organic (synthetic polymeric structure); inorganic (ceramics, metals and metal alloys). b) type of membrane. The membrane device can be intended to exploit the following technologies: MF; UF; NF; RO. The main characteristics and limitations of above technologies are given in the Annex B. c) membrane configuration: plate and frame; tubular; spiral wound; hollow fibres. d) mode of operation: dead-end filtration (washable or disposable membrane element); cross-flow filtration.
EN 14652:2005 (E) 12 5 Symbols and abbreviations The generic symbols are given in Table 1. Table 1 — Generic symbols Symbol or abbreviation Parameter Unit Cf Feed solution concentration of the considered substances mg/l Cp Filtrate/permeate solution concentration of the considered substances mg/l C Solid concentration % m/m D Particle diameter µm F Fluorescence of the suspension — c Beads concentration in the fluorescent latex suspension — Ci Influent water concentration mg/l Cp(i) Concentration of the monodimensional particles of “X” diameter in the product water mg/l Cf(i) Concentration of the monodimensional particles of “X” diameter in the feed water mg/l N Number of particles/ml — i Monodimensional fraction of solid particles % m1 Volumetric mass of the latex suspension m/v ms Volumetric mass of the latex particles m/v P Pressure in general (specified in the text with pedice and key) kPa PT First bubble pressure at T °C kPa P20 First bubble pressure at 20 °C kPa Ptm Transmembrane differential pressure kPa Pi Pressure at the inlet of the module kPa Po Pressure at the outlet of the module kPa Pp Pressure of the permeate solution kPa Q Flow rate m3/h
Tγ Surface tension at T °C N/m
20γ Surface tension at 20 °C N/m ∆P Differential pressure kPa
Conductivity ms/m
The graphic symbols used shall conform to the requirements of ISO 1219-1.
EN 14652:2005 (E) 13 6 Construction requirements 6.1 General Unless otherwise indicated, the following requirements shall be complied with and tested, if necessary on the complete system (device) as supplied by the manufacturer. 6.2 Materials The membrane, all other components of the separation device and additives in contact with drinking water shall comply with the relevant European Standards concerned with materials and chemicals in contact with drinking water. A device exclusively assembled with components complying with above relevant European Standard does not require further testing related to materials in contact with drinking water unless differently stated by national regulations. On the contrary (one or more components not specifically tested), the complete device will be tested in its final arrangement in accordance with the relevant test method unless differently stated by national regulations. NOTE Products intended for use in water supply systems should comply, when existing, with national regulations and testing arrangements that ensure fitness for contact with drinking water. The Member states relevant regulators and the EC Commission agreed on the principles of a future unique European Acceptance Scheme (EAS), which would provide a common testing and approval arrangement at European level. If and when the EAS is adopted, European Product Standards will be amended by the addition of an Annex Z/EAS under Mandate M/136 which will contain formal references to the testing, certification and product marking requirements of the EAS. 6.3 Resistance to temperature Within the service temperature range indicated by the manufacturer, the device shall not have any operating problems due to temperature exposure. Independently from above temperature range, the device should withstand a water temperature between 5 °C and 30 °C and between 5 °C and 35 °C for ambient air. 6.4 Resistance to hydrostatic pressure The device shall resist, without damage and leakage, a hydrostatic pressure equalling 3 times the design nominal pressure, with a minimum of 1 MPa or 1,6 MPa if connected with a pressure regulating valve, when tested as defined in A.2.1. NOTE 1 bar =100 kPa = 0,1 Mpa. 6.5 Resistance to cyclic pressure The device shall withstand a cyclic pressure fluctuating between 150 kPa and 1,3 times the design nominal pressure, with a minimum of a 1 MPa, when tested as defined in A.2.2. 6.6 Backflow prevention The device shall include an upstream backflow preventer in accordance with EN 1717. 6.7 Electrical safety The device shall comply with the relevant safety regulations.
EN 14652:2005 (E) 14 6.8 Noise level The device shall comply with EN ISO 3822. 6.9 Air vent The device shall ensure that any trapped air is removed in any operating condition. 6.10 End connections The fittings used to assemble the device and to connect it with the water main shall conform to the requirements of the relevant European or International Standards EN 1092-1, EN 1092-2, EN 1254-1, ISO 7-1 and EN ISO 228-1. 6.11 Drain connections Any drain fitting of the device shall be disconnected (air gap) from the drainage system in accordance with EN 1717. 6.12 Component replacement Any special tool necessary for routine maintenance shall not come into contact with the water intended for human consumption and shall be provided by the device supplier. The device shall be designed, and suitable instructions shall be provided, such that contamination of the treated water supply is avoided during the component replacement procedure. 6.13 Back-washable modules (MF and UF) Back-washable modules shall be capable of being cleaned automatically without the aid of tools and the mechanism shall not compromise to the quality of the drinking water. After back-washing, the module performance shall be recovered. The back-washable module shall be fitted with a free drain outlet in accordance with EN 1717. 7 Performance requirements 7.1 General The membrane module performance shall be specified by the manufacturer. This clause details the minimum acceptable performance level dependent on the type of device, together with appropriate test methods. The performance shall be rated with respect to the membrane module only (i.e. any pre-treatment and
post-treatment excluded) and the challenge water shall contain only the contaminant(s) which the device is intended to remove (i.e. the challenge water shall not contain contaminants which would normally be removed by pre-treatment or post-treatment). 7.2 Hydraulic performance (applicable to MF, UF) The manufacturer shall declare the maximum pressure drop through the membrane module at the recommended flow rate. The claim shall be tested in accordance with the test method defined in A.1.1.
EN 14652:2005 (E) 15 The maximum pressure drop shall not exceed the declared value by more than 10 % at the recommended nominal flow rate.
7.3 Mechanical performance 7.3.1 Housing resistance to static pressure When subjected to a static pressure test as defined A.2.1, the module housing shall show no permanent, visible signs of leakage, permanent deformation, cracks or breaks. 7.3.2 Cyclic pressure test of housing When tested in accordance with A.2.2, the filter housing shall satisfy the requirement of resistance cyclic pressure variations without showing permanent deformation or leakage. 7.3.3 Module resistance to differential pressure (collapse pressure) When tested in accordance with A.2.3 and the module is subject to continuous and progressive blinding up to a pressure drop equivalent to 80 % of the nominal pressure rating of the housing, there shall be no discontinuity in the pressure rise, nor, after careful removal and cleaning, any visible damage to the module and module housing. 7.3.4 Module cyclic differential pressure resistance (applicable to MF, UF membranes operating in dead-end mode) When subjected to a cyclic flow of water sufficient to generate a peak pressur
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