DVGW certification of products in contact with drinking water Higieny... · for backflow preventer...
20
DVGW certification of products in contact with drinking water Dr.-Ing. Dipl.-Biol. Karin Gerhardy – Technical Manager Water Resources / Water Quality DVGW e.V. www.dvgw.de Content of presentation What does "certification“ mean? What are the benefits? Certification procedure - Testing requirements (for valves) - Examinations / type testing - Certification by DVGW CERT GmbH - Monitoring Self-monitoring External monitoring Conclusions
Transcript of DVGW certification of products in contact with drinking water Higieny... · for backflow preventer...
DVGW certification of products incontact with drinking water
Dr.-Ing. Dipl.-Biol. Karin Gerhardy –
Technical Manager Water Resources / Water Quality
DVGW e.V.
www.dvgw.de
Content of presentation
What does "certification“ mean?
What are the benefits?
Certification procedure
- Testing requirements (for valves)
- Examinations / type testing
- Certification by DVGW CERT GmbH
- Monitoring
Self-monitoring
External monitoring
Conclusions
www.dvgw.de
DVGW certification of products in contact with drinking water
What does "certification“ mean?
Certification is a conformity assessment by an recognized impartial thirdbody (= certification body or new „conformity assessment body“).
DVGW-Certifcation is to ensure that materials and products have therequired safety, fitness for use, functionality, quality, hygiene andenvironmental compatibillity for use in contact with drinking water
It shall be verified that the product meets all the requirements of thespecific testing standards by an initial type testing from a recognizedtesting laboratory.
then the product will get a DVGW certification mark
After that monitoring of the manufacturing of the product in the marketphase takes place.
www.dvgw.de
DVGW certification of products in contact with drinking water
The certification body itselfs needs for its work anaccreditation ( e.g. according to DIN EN 45011)
Accreditation certificate of
DVGW CERT GmbH
DAR-Reg.-No.:
DAT-ZE-009/96-02
‘accreditation’
shall mean an attestation by a national accreditationbody that a conformity assessment body meets therequirements set by harmonised standards and,where applicable, any additional requirementsincluding those set out in relevant sectoral schemes,to carry out a specific conformity assessmentactivity.
www.dvgw.de
Regulation for accreditation and market surveillance
According to the EC-Regulation (EC No 765/2008) „setting out therequirements for accreditation and market surveillance relating to themarketing of products and repealing Regulation EEC No 339/93,
there will be only one national accreditation body!
“conformity assessment” is there defined as:
the process demonstrating whether specified requirements relating to a
product, process, service, system, person or body have been fulfilled.
www.dvgw.de
DVGW certification of products in contact with drinking water
What are the benefits?
The certification mark offers the following benefits:
Manufacturers who use globally recognized standards for conformityassessment, set standards for service quality
Openness and transparency increased confidence
in dealing with audit and control = Market acceptance
mechanisms
DVGW testing standards (product standards, functional standards an soon) always include the three aspects:
Hygiene, safety and usability
www.dvgw.de
DVGW certification of products in contact with drinking water
What are the benefits?
The DVGW certification marks:
• demonstrate a high safety, quality and hygiene standards
• show a constant correlation between the rule-setting (requirement) andexamination
• demonstrate competence through 70 years experience in the field ofcertification
• prove the highest national, European and international recognition
www.dvgw.de
using the example of valves in contact with drinking water
DVGW W 336 Tapping valves for drinking water – requirements and tests“
DVGW VP 646 Isolating valves, check, valves air valves and control valvesmade of metallic materials for drinking water distribution systems –requirements and tests“
DVGW W 570 part 1 and 2 Valves for drinking water installation
part 1: Requirements and Testing of valves in buildings
part 2: Requirements and Testing of protection valves
Certification procedure
www.dvgw.de
Certification procedureDVGW W 570 part 1 and part 2
Table of contents:Preamble
Scope
Normative references
Terms
Requirements and testing
Type Testing
Monitoring
Self-monitoring
External Monitoring
Labelling
Appendix
www.dvgw.de
Certification procedure
Why do we need protection valves in domesticinstallation?
As a basic standard, DIN EN 1717 establishes astandard for drinking water installations to securedrinking water from non potable water. Itdifferentiates the application areas for protectionvalves and defines the permissible fluid categories.
www.dvgw.de
Certification procedure
Fluid Categories according to EN 1717
fluids with health risk by pathogens (microorganisms orviruses)
5
fluids with health risk by one or more toxic or very toxicsubstances (radioactive, mutagen or carcinogenicsubstances, too)
4
fluids with health risk by one or more less toxicchemical substances
3
fluids with no harm for humans (e.g. only with changes inodour, flavour, colour or temperature)
2
drinking water directly out of domestic installation1
Specification (according to DIN EN 1717)Fluid
Category
www.dvgw.de
Valves for protection
check-valve with shut-off function tosecure and stop (EA)
for protection against fluid category 2
check-valve for protection (EA)
for protection against fluid category 2
backflow preventer (BA)
for protection against fluid category 4
drain/free spout
for protection against
fluid category 5
www.dvgw.de
Certification procedure
Certification within the meaning of the Rules of Procedure of DVGW CertGmbH involves conformity assessment of a product by DVGW CERTGmbH on the basis of test reports issued by testing laboratoriesrecognised by DVGW CERT GmbH.
For this purpose, the products to be certified are tested in a preciselypredetermined and verifiable procedure for their conformity with the testspecifications.
Test procedures used for certification must be published and be generallyaccessible to the professional and trade public before their application.
www.dvgw.de
Certification procedure- Type testing
Application for certification must be made to Cert GmbH (including severaldocuments)
DVGW Cert shall check wether the application is valid and complete and towhich procedure it is to be assigned and if there is an applicable testspecification.
The certification procedure will be realized according to the Rules ofprocedure of DVGW Cert unless furhter items are required by the testspecification (technical standard).
The applicant (manufacturer or trader etc.) will contact test laboratories,which are acknowledged by DVGW Cert to begin type-testing.
www.dvgw.de
Certification procedure- Type testing
Sampling for type testing:
the assigned control inspector or product auditor takes the samples fromthe manufacturer or distributor. The number of samples must be agreedbetween the testing laboratory and DVGW Cert, if this is not specified inthe technical standard.
f.e. DVGW W 570:
For type testing:
2 samples minimum per nominal size have to be taken,
for backflow preventer (BA) minimum 1 sample per nominal sizehas to be taken.
www.dvgw.de
Certification procedure- Type testing
Type testing has to be done according to requirements and testing ofW 570.
All materials, regardless of where they are used in contact with drinkingwater, have to meet the requirements of basic standards of hygiene.
Components which are intended to come into contact with drinking water,must not change the quality of the drinking water.
This means for metallic materials: The requirements of the materialcomposition of DIN 50930-6 are fulfilled.
This is achieved by a test certificate according to DIN EN 10204- 3.1 Metal
analysis demonstrated at each batch.
www.dvgw.de
Certification procedureTesting requirements for valves - Hygiene requirements
For non-metallic and non-cementitious materials:
- all plastic parts, coatings and lubricants need to be tested according tothe specific UBA-Guidelines (just like KTW-GL,coating-GL andlubricant-GL)
- for rubber products (e.g. sealings) a testing according to KTW-recommendation 1.3.13. is necessary
- Testing according to DVGW W 270 is necessary for all organiccomponents (exklusive lubricants)
In all cases of testing successful testing will be confirmed by a testcertificate. These test certificates are precondition for certification.
www.dvgw.de
Certification procedureTesting requirements for valves - Hygiene requirements
European standards, if available, are often include the requirements forproducts in contact with drinking water.
Additional to this, national requirements are listed in the product standards.
For example:
backflow preventer (BA):
requirements of
DIN EN 12729 with the following national amendments and additions:
• according to the decrease in pressure the flow curve have to be testedup to minimum 1,5 bar
• the mounting and operational guidelines are to be checked (e.g. if theycontain a reference to annually untertaking of maintenance)
www.dvgw.de
For controllable backflow preventer (BA)
DIN EN 12729 gives fundamental requirements:
Physico-chemical characteristics
Materials
Nature of the materials
Design
General
Relief valve
Characteristics and tests
General tolerances
Expression of the results
Dimensional characteristics
Connections
Pressure taps
Certification procedure
Testing requirements for valves - Technical requirements
www.dvgw.de
continuing:
Mechanical characteristics (requirement and test methods)
mechanical resisteance of body under pressure
Endurance (behaviour at temperature and thermal shock)
Bending strength – tightness of the body
Tightness characteristics (requirement and test methods)
Verification
of the tightness of the downstream check valve
of the closing pressure of the downstream check valve and its tightness
of the tightness of the upstream check valve at low pressure
of the tightness of the upstream check valve under vacuum
Certification procedure
Testing requirements for valves - Technical requirements
www.dvgw.de
Certification procedure- Type testing
continuing:
Hydraulic characteristics (test rig, requirements and test methods)
Verification
- of the pressure los as a function of the flow rate
- of the pressure difference between the upstream and theintermediate zone
- of venting to atmospheric pressure of the intermediate zone whenthe upstream pressure drops
…..and so on
Compatibility with the products used for disinfection of the networks
Resistance to corrosion – salt spray fog test
Acoustic tests
www.dvgw.de
Certification procedure- Type testing
Leak-tightness against external pressureValves must be tight against the ingress of air, water and foreign substances of any kind,
pressure change during testing may be 0.02 bar or less.
www.dvgw.de
Certification procedure- Type testing
Leak-tightness against external pressure
www.dvgw.de
Certification procedure- Type testing
Leak testing
www.dvgw.de
Certification procedure- Type testing
Details of leak testing
Picture shows a valve which does not meet the requirements
www.dvgw.de
Certification procedure- Type testing
Endurance test
www.dvgw.de
Certification procedure- Type testing
The test reports must specify the current status of the product and theunderlying test specification and it must comply with the requirements ofDIN EN ISO /IEC 17025.
After type testing all documents required for conformity assessment mustbe made available to DVGW Cert. Any additional test and materialcertificates must be valid throughout the full term of the DVGW certificate.
www.dvgw.de
DVGW certification of products in contact with drinking waterCertification by DVGW CERT GmbH
www.dvgw.de
DVGW certification of products in contact with drinking waterCertification by DVGW CERT GmbH
www.dvgw-cert.com Online-register of all certified products
www.dvgw.de
DVGW certification of products in contact with drinking waterCertification by DVGW CERT GmbH
„List of certification water“: A printed version of all DVGW certification, encluded aCD-ROM, Selled by: www.wvgw.de
www.dvgw.de
Period of validity of the certificate
Depending on the test specifications the certificate is limited in time.
The period of validity of the certificate is as follows
for testing in accordance with
• DIN (EN) standards 5 years
• DVGW Codes of Practice 5 years
• DVGW test specifications (VP) 3 years
www.dvgw.de
Monitoring
To confirm the manufactured products conformity with the certified type,production surveillance at regular intervals is required.
Self-monitoring
the manufacturer has to undertake self-monitoring of production in amanner that enables an assured assessment of production.
External monitoring
Monitoring of product by taking random sampling by a third party (often testlaboratory)
www.dvgw.de
Monitoring
Self-monitoring
includes (for backflow preventer BA):
valid test certificates for the used material
testing of leak-tightness and function
- compression zone testing
- opening pressure at balanced valve
- testing of leak-tightness of backflow preventer on the output side
- testing of leak-tightness with nominal pressure
All results must be dedicated to the respective series-number anddocumented.
www.dvgw.de
Monitoring
Self-monitoring
f.e. in DIN EN 1074-1 as a requirement for valves in water supply:
The manufacturer has to monitor the quality of its products during theirmanufacturing within a production control system, that the manufacturedproducts fulfil the use suitability requirements of this standard.
The quality system of the manufacturer have to comply with therequirements of DIN EN ISO 9002. In addition, it is recommended that thequality management recognized by a competent independent certificationagency.
www.dvgw.de
Monitoring
External monitoring
The manufacturer will be checked whether the requirements of testing aremet.
Implementation by an auditor of the testing laboratory
Review of manufacturers self-monitoring
Documentation in a control test report
Monitoring interval varies depending on relevant testing standard(e.g. DVGW VP 646 every two years on site at the manufacturer)
www.dvgw.de
Monitoring
biennialReview of self-monitoring6.1
presentation ofvalid ABP
XXrequirements on noise behaviour11
Xtesting of leak-tightness10.10
biennialXvakuumtesting10.9
all 6 yearsXendurance strenght10.8
Xtesting of leak-tightness10.7
all 6 yearsXbending moment, mechanical strenght of bodyand leak-tightness
10.6
all 6 yearsXrate of flow/ / decrease in pressure10.5
biennialXleak-tightness10.4
biennialXXvisual inspektion / dimensions10.3
biennialXXLabelling7.2
presentation ofvalid certificates
XXMaterials4.1
W 570-2DIN EN14451
Externalmonitoring
self-monitoring
Typetesting
Requirements and Testing according to chapter
Determination of self-monitoring and external monitoring for anti-vacuum valve (W 570-2)
www.dvgw.de
DVGW – certification
> 30.000 certified products
> 1.500 certified enterprises
> 80 certified management systems
> 200 certified DVGW experts
www.dvgw.de
Harmonised requirements for products in contact with drinking water are stilllacking in the EU. Therefore European Directives for the certification of productsare not available.
The DVGW- and the DIN-DVGW certification according to the DVGW Regulationsgives an evidence of the generally acknowledged technical standards.
The products certified and monitored are in conformity with the national statutoryrules and regulations, the requirements of DIN standards and the DVGWStandards and Codes of Practice as well as common market practice.
DVGW-Certifcation is to ensure that materials and products have therequired safety, fitness for use, functionality, quality, hygiene andenvironmental compatibillity for use in contact with drinking water.
DVGW – certification
www.dvgw.de
Do you have any question?
Not certified drinking water heater:
Thank you for your attention!
