Bsi bs en 14095 2003 (2008)

covers fm BRITISH STANDARD BS EN 14095 2003 Water conditioning equipment inside buildings — Electrolytic treatment systems with aluminium anodes — Requirements for performance, safety and testing Conf[.]

Water conditioning

equipment inside

buildings —

Electrolytic treatment

systems with

aluminium anodes —

Requirements for

performance, safety

and testing

The European Standard EN 14095:2003 has the status of a

British Standard

ICS 13.060.20; 91.140.60

Confirmed November 2008

This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee on

12 January 2004

© BSI 12 January 2004

National foreword

This British Standard is the official English language version of

EN 14095:2003

The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/13, Domestic water treatment, which has the responsibility to:

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 Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

Standards Online

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

— aid enquirers to understand the text;

— present to the responsible international/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

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover

The BSI copyright notice displayed in this document indicates when the document was last issued

Amendments issued since publication

EUROPÄISCHE NORM December 2003

ICS 13.060.20; 91.140.60

English version

Water conditioning equipment inside buildings - Electrolytic

treatment systems with aluminium anodes - Requirements for

performance, safety and testing

Appareils de conditionnement d'eau à l'intérieur des

bâtiments - Installations électrolytiques avec anodes en

aluminium - Exigences de performances, de sécurité et

d'essais

Anlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Elektrolytische Dosierungsanlagen mit Aluminiumanoden - Anforderungen an Ausführung und

Sicherheit, Prüfung

This European Standard was approved by CEN on 14 November 2003.

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 Management Centre 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 Management Centre 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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: rue de Stassart, 36 B-1050 Brussels

Contents Page

Foreword 3

Introduction 4

1 Scope 5

2 Normative references 5

3 Terms and definitions 5

4 Materials design and requirements 6

4.1 Dosage of hydrated aluminium oxide 6

4.2 Direct current generator 6

4.3 Water meter 7

4.4 Anodes 7

4.5 Conditioning tank 7

5 Performance requirements 8

5.1 DC generator 8

5.2 Terminals 8

6 Performance testing 8

6.1 Test bench 8

6.2 Switchboard test 9

6.3 DC generator test - procedures 9

6.4 Terminals 10

7 Technical documents and labelling 11

7.1 Rating plate on the DC generator 11

7.2 Owners booklet 11

7.3 Anodes 11

7.4 Label 11

Annex A (informative) 12

A.1 Operating conditions 12

A.2 Example of use 12

A.3 Aluminium composition 13

A.4 Water analysis 14

A.5 Electrolytic dissolution of aluminium 14

A.6 Maintenance 14

A.7 Operating and commissioning 15

Bibliography 16

This document (EN 14095:2003) 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 2004, and conflicting national standards shall be withdrawn at the latest by June 2004

Annex A is informative

This document includes a bibliography

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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom

In respect to potential adverse effects of the quality of water intended for human consumption, caused by the product covered by this standard:

a) this 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;

b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing regulations concerning the use and/or the characteristics of this product remain in force

1 Scope

This European Standard applies to electrolytic dosing systems for conditioning water intended for human consumption inside buildings and based on dissolution of aluminium anodes (with imposed DC current) It specifies constructional (but not dimensional) and operational requirements It describes relevant methods for testing performance and safety It only concerns units which are permanently connected to the mains supply

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 the publication referred to applies (including amendments)

EN 573-3, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 3: Chemical composition

EN 602,Aluminium and aluminium alloys — Wrought products — Chemical composition of semi products used for the fabrication of articles for use in contact with food

EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow

EN 12499, Internal cathodic protection of metallic structures

prEN 12897, Water supply - Specification for indirectly heated unvented (closed) storage water heaters

EN 55011, Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement (CISPR 11:1997, modified)

EN 60335-1, Household and similar electrical appliances - Safety - Part 1: General requirements (IEC 60335-1:2001, modified

ISO 7858-1, Measurement of water flow in closed conduits Combination meters for cold potable water Part 1: Specifications

ISO 7858-2, Measurement of water flow in closed conduits Combination meters for cold potable water Part 2: Installation requirements

3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply:

3.1

conditioning of water intended for human consumption

modification of the characteristics of drinking water for a special purpose within the limits stipulated in the Directive 98/83/EEC, adopted in national legislation of the Member States

anode

electrode connected to the positive (+) output from the direct current generator

3.3

anode lifetime

time interval between replacements of the aluminium anodes

3.4

cathode

electrode connected to the negative (-) output from the direct current generator

3.5

direct current generator

device which supplies low voltage direct current to the anodic dissolution of the aluminium anodes

3.6

hydrated aluminium oxide

dosing agent first reaction product, which is formed by the dissolution of the aluminium anodes as a function

of the Direct Current with water

3.7

conditioning tank

vessel in which the anodic dissolution of the aluminium anodes occurs It is located inthe main hot water line after re-heating, in front of the distribution network which is to be protected

3.8

conditioning time

residence time of the conditioning tank It is the volume of the conditioning tank divided by the cumulative flow rate of water

4 Materials design and requirements

4.1 Dosage of hydrated aluminium oxide

The reaction products of the aluminium anodes shall not give rise to concentrations beyond the limit in accordance with the National and European regulations concerning the quality of water intended for human consumption (e.g EC Directive 98/83/EEC) (see 4.4)

The maximum aluminium concentration (expressed as Al) shall not exceed 0,2 mg/l in cold water and 0,5 mg/I

in heated water (see 4.2)

4.2 Direct current generator

The electrical apparatus, connections and mountings on site shall be in accordance with EN 60335-1 The Direct Current Generator with its connections to anodes, cathodes and other appliances shall be in accordance with EN 55011

The DC output shall be controlled as a function of the water consumption

The current shall be limited to ensure that the amount of dissolved aluminium concentration does not exceed the permitted value of the national regulations

There shall be visual indication of the operating status of the DC generator

The DC generator shall be designed to allow the summation of the necessary current demand for each treated water circuit

4.3 Water meter

An impulse water meter (or impulse flow meter or inductive flow rate meter) in accordance with ISO 7858 (parts 1 and 2) shall be installed in-line in the cold water inlet in front of the conditioning tank to regulate the direct current, in accordance with variation in water flow

Alternatively a water meter to measure the total consumption of the water conditioned and a flowmeter to give information to the DC generator shall be installed

4.4 Anodes

The aluminium quality, which is used to manufacture the anodes shall be approved for contact with foodstuff according to EN 573-3 and EN 602

4.5.1 Volume

The volume of the conditioning tank shall be sufficient to allow a conditioning time of at least 15 min

4.5.2 Access

The tank shall be fitted with an access for maintenance applying Table 3 (class A) and Table 4 (class B) of

prEN 12897

4.5.3 Cathodic protection

If a complementary cathodic protection is necessary then the requirements of EN 12499 shall be observed

4.5.4 Aeration and air release

The tank shall be fitted with an automatic corrosion resistant aeration and air release valve to conform to

EN 12499

4.5.5 Sludge drain

A ball valve shall be fitted at the lowest point of the conditioning tank Its diameter shall be equal to the diameter of the water inlet but no more than DN 50 even if the water inlet diameter is larger For a vertical tank, the sludge drain outlet shall be welded to the centre of the tank bottom For a horizontal tank, the sludge drain fitting shall be welded to the bottom of the opposite side of the water inlet

4.5.6 Heating coil

If there is a heating coil in the conditioning tank, the tubes must be widely spaced to avoid accumulation of sludge and scale The tubes shall be positioned on a square centre configuration

4.5.7 Back-flow protection

The tank shall be protected against back-flow of sludge into the supply system in accordance with EN 1717

5 Performance requirements

Each type of DC generator shall be tested for the accuracy of the delivered current in accordance with the water flow, and for the conformity to 4.2 above This shall be done on a testing bench (see Figure 1) simulating the flowmeter and the variability of the impedance according to changes of output circuit load The consistency of the output current from the DC generator shall be tested for varying conditions, by variation of the conductivity and water consumption There shall also be a long term output consistency test

In each test the current shall be recorded for a 10 min period, after a 5 min stabilization period at the minimum, 50 % of the maximum and the maximum level stipulated by the system manufacturer

For each 10 min period, the current output shall not exceed + 5 % nor – 5 % of the regulated value

If under high flow rate conditions, it is possible, due to integral function of the current controller, for the aluminium concentration to increase, it shall be verified that the maximum dosage cannot be exceeded

5.2 Terminals

5.2.1 Pressure test

When subjected to a hydraulic pressure of 2 times the nominal pressure for a period of 10 min to 12 min no visible leakage shall occur

5.2.2 Insulation test

There shall be a measurable difference in potential between the flange and the anode connection (see 6.4.2)

6 Performance testing

6.1 Test bench

6.1.1 General

The testing bench includes following items:

6.1.2 Rack

The rack is designed to support one or more generators to be tested with their input and output connections

6.1.3 Load

To simulate the change of the conductivity in the water being conditioned, the load is a variable resistance represented on Figure 1 Each positive output of a generator shall be connected on one variable resistance However the negative connection is common It shall be designed to support the maximum output without overheating The variation of the resistance can be operated manually

4 Ampere recorder

Figure 1 — Test bench 6.1.4 Impulse water meter

The gear and the impulse generator of a water meter shall be operated by a variable speed motor in order to simulate water flow (Figure 1 programmed water meter simulator) The corresponding instantaneous and cumulative water-flow shall be registered

6.1.5 Power measurements

A voltmeter and an ammeter are connected to each load terminal and continuously recorded (Figure 1 Ampere recorder)

After mounting and putting into service, the visual indication of DC generator operating mode shall be checked

6.3 DC generator test - procedures

6.3.1 Current regulation for constant load

Knowing the maximum manufacturer’s rated output for the DC generator, the maximum current can be calculated from Faraday’s Law for the maximum required aluminium concentration (see A.5)

Set the corresponding simulated flow rate and adjust the variable resistance to give 50 % of the maximum

DC voltage given by the manufacturer The requirement under 5.1 shall be satisfied

6.3.2 Constant current variable load

With the simulated flow rate maintained at 100 % of maximum, repeat 6.3.1 with the variable resistance adjusted to minimum voltage and then repeat again at maximum voltage The requirements under 5.1 shall be satisfied