Finnish Quality Assurance and Certification Scheme for Preinsulated District Heating Pipe Systems

8/11/2019 Finnish Quality Assurance and Certification Scheme for Preinsulated District Heating Pipe Systems

1/38

SCHEME RULES 1 1 (10)

Approved by the Board September 19th, 2003

Supersedes rules of February 12th, 2002

Valid from 1st of January, 2004

Updated April 3rd, 2006- Only editorial changes

This is a translation from the original text inFinnish language

FINNISH QUALITY ASSURANCE AND CERTIFICATION SCHEME FORPREINSULATED DISTRICT HEATING PIPE SYSTEMS

CONTENTS

0 Introduction1 Object2 Scope3 General rules

4 Administration, organisation5 Application6 Certificate, Quality mark (LT-mark)7 Certification procedure

7.1 Initial type tests and inspection7.2 Manufacturer's quality surveillance7.3 External inspection7.4 Quality of delivered products

8 Modifications to materials, products, production methods9 Test laboratories10 Use of Certificate and Quality mark (LT-mark), requirements for product marking11 Actions in case of non-compliance, non-conformity, misuse of certificate or LT-mark12 Suspension of certificate and LT-mark licence13 Withdrawal of certificate and LT-mark licence14 Communications, publications15 Responsibility for product quality16 Documentation, records17 Appeals against Executive Committee decisions18 Complaints of product quality19 Confidentiality20 Costs and fees

Annex A Supplementary requirements of FEI Recommendations L1/2003 and L2/2003 to EN

253, 448, 488 and 489Annex B Preinsulated pipes, manufacturer's type test, items, test methods and activitiesAnnex C Joints of preinsulated pipes, manufacturer's type test, items, test methods and

activities


2/38

2

Annex D Preinsulated pipes, manufacturer's quality surveillance, items, test methods andminimum test frequencies

Annex E Joints of preinsulated pipes, heat shrinkable materials, manufacturer's qualitysurveillance, items, test methods and requirements

Annex F Tests and/or inspection in consequence of modificationsAnnex G Application for Quality mark (LT-mark) licenceAnnex H Application for Certificate

Annex I Pattern of LT-mark licenceAnnex J Pattern of certificate for casing pipeAnnex K Pattern of certificate for joint constructionAnnex L Pattern of certificate for joint PUR insulationAnnex M Pattern of letter communicating lists of LT-mark licences and certificatesAnnex N Example of instruction for spot testingAnnex O List of approved Test Institutes for tests according to EN 253, 489Annex P List of approved PE-materials for casing productionAnnex Q Design of the Quality mark, "LT-mark"Annex R Fees related to certificate and LT-mark licenceAnnex S Requirements for twin pipes (FEI Recommendation L1/2003)


3/38

3

FINNISH QUALITY ASSURANCE AND CERTIFICATION SCHEME FORPREINSULATED DISTRICT HEATING PIPE SYSTEMS

0INTRODUCTION

The Finnish Quality Assurance and Certification System for District HeatingPipe Systems is based on an agreement between Finnish Energy Industries(FEI) representing users (energy companies) and Finnish Plastics IndustriesFederation (FPIF) representing manufacturers. According to the agreement FEIadministers the system and carries out the day-to-day operations.

FEI recommends it's member companies to buy and use only certifiedproducts. Product certification is recommended to be part of requirements intender documents of the energy companies. When nevertheless uncertifiedproducts (which fall under the scope of this scheme) are offered by the bidder,this shall clearly be stated in the bid to avoid confusion.

1OBJECT The purpose of the Scheme is to provide a voluntary certification system which

is economical, beneficial for both suppliers and users and provides users an

easy way to obtain required assurance of the sufficient quality of the products(Certificate, Quality mark). The aim is to ensure the required quality of productsmentioned in "Scope" to be delivered to Finnish market and to avoid unsoundprice competition at the expense of quality.

These Scheme Rules deal with practicalities involved in operating theCertification Scheme, e.g. how to obtain and maintain certification, use ofquality mark and procedures and processes to be followed.

2SCOPE The scope of the Scheme includes following products and their production:

- preinsulated district heating pipes, straight lengths and fittings covered byEN 253, EN 448, EN 488 and Recommendation L1/2003 published by FEI(including twin pipes; additional requirements for twin pipes, see Annex S)

- PE casing pipes to be used in above mentioned DH pipes- Joint constructions and materials covered by EN 489 and Recommendation

L2/2003 published by FEI

Quality assurance and certification is based on these Scheme Rules and abovementioned standards and specifications.

Annex A gives the supplementary requirements of the above mentioned FEI

Recommendations to EN 253, 448, 488 and 489.

In addition to quality assurance the Certification and Quality Marking Schemeaims at maintaining and promoting standardisation. For this reason e.g.


4/38

4

dimensions DN 20 and DN 32 as well as other insulation thicknesses thanthose standardised in FEI recommendation L1/2003 are not covered by thecertificate and can't be quality marked.

3GENERAL RULES

All suppliers have even access to certification on same financial and otherconditions. The system is run on a non-profit basis.

4ADMINISTRATION, ORGANISATION

The governing Board is responsible for and controls the performance ofcertification, e.g. finances, operation of executive body, investigations ofcomplaints and updating these rules. The Board has four members, twoappointed by FEI and two appointed by FPIF.

The day-to-day operations are taken care by Executive Committee (ExCo)which consists of one person appointed by FEI. The ExCo is entitled to employexternal experts making inspection visits and taking samples for type and spottests.

5APPLICATION

A manufacturer, who wishes to obtain a Certificate and a Quality mark licence,shall submit an application to the ExCo on a special form (Annexes G and H).

The same form shall be used to apply for an extension of scope of existingcertificate, in case of changing the place of manufacture of the product andwhen contracting a submanufacturer for preinsulated pipe or fitting production.

The application shall be enclosed with a description of the quality control plan,including manufacturer's surveillance and inspection procedures, frequenciesand documentation (models of inspection/test reports, control charts...).

6CERTIFICATE, QUALITY MARK (LT-MARK)

After acceptance of application and on satisfactory completion of initialinspection and type tests the ExCo grants the supplier a Certificate and an LT-mark licence.

A Certificate and an LT-mark licence is granted to preinsulated pipes andfittings. The manufacturer of fittings only (fitting supplier) can certify thesefittings only as a subsupplier to a manufacturer with production of both pipesand fittings (system supplier).

A Certificate is granted to casing pipes, joint constructions/materials and joint

foams.

Only certified casing pipes shall be used for production of pipes and fittingscovered by an LT-mark licence. In case the preinsulated pipe manufacturer


5/38

5

produces the casing pipes for own preinsulated pipe production they arecovered by the LT-mark licence.

Joint materials, e.g. heat shrinkable sleeves might be used in different jointconstructions, either certified or not, and hence joint materials/componentsshall not be LT-marked.

One and the same LT-mark licence can cover both pipes and fittings, in bothsingle and twin pipe systems (see Annex I).

The Certificate and LT-mark licence covers the production units mentioned inthe Certificate. Extension of a Certificate to cover other production units ofpreinsulated pipes or fittings calls for the same procedure (application, initialinspection and type tests).

The Certificate and LT-mark licence can't be transferred to another productionunit or another company.

A Certificate can be extended to include subsuppliers to produce preinsulatedpipes and/or fittings. Also this calls for an application, initial inspection and typetests. The LT-marked pipes/fittings produced by the subsupplier shall bemarked with the supplier's LT-mark and delivered by the supplier. Note: Thisprocedure does not entitle the subsupplier to sell the LT-marked pipes/fittingsdirectly. The principle is as follows:- supplier and subsupplier shall make a contract- the subsupplier is allowed to make the agreement with more than one

supplier- the supplier is responsible for the subsupplier's surveillance, inspections

and all the costs associated with the certification (e.g. type tests,performance of manufacturer's quality surveillance, inspection visits)

- subsuppliers shall also perform type tests and manufacturer's surveillancein accordance with the requirements

- documentation of the surveillance shall be kept by both supplier (at leastsummaries) and subsupplier

- the ExCo is allowed to make inspection visits to subsuppliers, too- no extra annual fee for the supplier or the subsupplier- the subsupplier is allowed to use only the LT-mark, sticker or tape of his

contracting party (supplier).

The validity period of a Certificate and an LT-mark licence is one year at a time.

In the case of amendment or revision to the relevant EN standards, FEIrecommendations or these Scheme Rules a supplementary inspection and/ortype testing may be required to prove compliance with the changedrequirements in order to re-issue the Certificate and LT-mark licence.

Pattern of LT-mark licence is given in Annex I and patterns of Certificates inAnnexes J to L.


6/38

6

7CERTIFICATION PROCEDURE

Testing and inspection procedures in order to obtain and maintain Certificateand LT-mark licence include:- initial type tests and inspection

- manufacturer's quality surveillance- external inspection- check of quality reclamations (follow up of field quality)

7.1Initial type tests and inspection

Type testing and inspection is performed to obtain initial validation of materials,products, production processes and manufacturer's quality surveillance. Typetests shall demonstrate that products conform to all requirements for thecharacteristics given in Annex B and Annex C, as applicable. For a

manufacturer of casing pipes only, the type test consists of PE tests + shearstrength before ageing and impact resistance of the pipe assembly.

After application for a Certificate and LT-mark licence, an initial type inspectionvisit to the manufacturer is made by the ExCo and type tests shall beperformed.

The initial type inspection shall provide evidence that the manufacturer meetsall the requirements of this Certification Scheme.

The ExCo, approved Test Institute (see Annex O) or a person authorised by the

ExCo takes samples for type tests. Random sampling from a representativeselection of products must be possible. In case of joint constructions andmaterials the ExCo, approved Test Institute or a person authorised by the ExCosupervises the making of test specimens.

Type tests shall be performed in one of the approved Test Institutes. Thesupplier is responsible for sending the samples to the Test Institute and for therelated costs. A test performed not more than half a year before the date ofapplication is accepted, provided that impartial sampling can be proved.

The type test for joint constructions and joint materials has to be renewed every5 years. For joint constructions this test is done according to EN 489, but ononly one test sample (instead of three in the initial type test). For joint foams thetest is done according to EN 489 with the exception that the shear strength ismeasured in unaged condition according to 5.4.2 or 5.4.3 of EN 253 (instead ofaged condition in the initial type test) and that only one PUR test specimen(instead of three in the initial type test) is taken from both joints of the samplefor each PUR-test. A test performed not more than half a year before the datewhen the ExCo asks for a renewed test, is accepted.

This renewed type test is performed as kind of compensation for the fact that,

unlike pipes and fittings, annual external inspections of manufacturer's qualitysurveillance are not performed for joints.

If all the results of the initial or renewed type inspection and/or type tests arenot satisfactory for obtaining certification, the applicant should apply corrective


7/38

7

actions. After that those parts of inspection and/or tests considered necessaryby the ExCo shall be repeated.

7.2Manufacturer's quality surveillance

The manufacturer shall undertake surveillance to ensure that the requiredquality level is continually maintained. The minimum requirements ofsurveillance (characteristics and test frequencies) are given in Annex D andAnnex E.

The tests and measurements can be performed by the manufacturer itself orthey can be outsourced to a subcontractor or test laboratory.

All surveillance tests and measurements shall be documented, giving theinformation of the samples, results, dates and name of controller. Thesedocuments together with documents on manufacture and received materials

and components shall be maintained for at least 5 years and the ExCo shallhave access to them.

For inspection purposes, in order to facilitate the evaluation of test frequenciesand functioning of quality surveillance, the manufacturer shall have- for each character summaries on the amount of tests performed per

dimension and type of pipe and fitting- corresponding summaries of manufactured or received components and

finished products.

7.3

External inspection

External inspection is performed in order to evaluate the licensee's continuedcompliance with all the specified requirements for Certification, especially theminimum extent and proper functioning of the manufacturer's qualitysurveillance. This inspection may include sampling of products for spot tests.An example of a spot test instruction is given in Annex N.

A written report on the results of every inspection is prepared by the ExCo andsent to the licensee.

Inspection visits to pipe and fitting manufacturers are normally made by theExCo at least once a year, with or without advance notice. When requested, themanufacturers of heat shrinkable sleeves for joints are required to sendcertificates of their quality surveillance and results of the surveillance of thebatch specified by the ExCo.

7.4Quality of delivered products

Feed back is gathered by the ExCo from the field in order to follow up the

quality of the delivered products. The licensees shall keep record of the qualityreclamations they receive from the field and the actions they have consequentlytaken. These records can be checked during external inspection visits.


8/38

8

8MODIFICATIONS TO MATERIALS, PRODUCTS, PRODUCTION PROCESSES

The licensee is obliged to notify the ExCo of any significant modification madeto the product (design, construction, materials) or production process havingpossible effect on either the compliance of the finished product with the relevant

EN standards and FEI recommendations or on the validity of the Certificate.The ExCo decides whether or not this effect exists. In positive case new typetests and/or inspection is required in total or to the extent judged by the ExCobased on general principles given in Annex F.

9TEST LABORATORIES

Test laboratories accepted by the Board can be employed to perform type andspot tests (see Annex O).

10USE OF CERTIFICATE AND QUALITY MARK (LT-MARK), REQUIREMENTS FORPRODUCT MARKING

The licensed manufacturer of preinsulated pipes and fittings is entitled to affixthe LT-mark on the certified products. Certificates and LT-mark licences mayalso be used in marketing and advertising of certified products. This must notcause confusion between certified and non-certified products of themanufacturer, especially in bidding process.

The design of an LT-mark is given in Annex Q. The size and colours of the

mark may be freely chosen.

11ACTIONS IN CASE OF NON-COMPLIANCE, NON-CONFORMITY, MISUSE OFCERTIFICATE OR LT-MARK

Any non-compliance on the part of the manufacturer in the application of theseScheme Rules or any non-conformity of the products with the specified ENstandards and FEI recommendations, e.g. required minimum test frequenciesin surveillance are not met or spot tests reveal substandard quality, may result

in one of the following actions:- corrective action by the manufacturer, specified by the ExCo, e.g. remarkand correction claim, additional/intensified surveillance for a specifiedperiod, repeated external inspections and/or additional spot tests in one ofthe approved Test Institutes at the cost of the manufacturer

- reduction of the scope of products on the Certificate/LT-mark licence- public warning (notified to the members of FDHA)- suspension of the Certificate/LT-mark licence- withdrawal of the Certificate/LT-mark licence

12

SUSPENSION OF CERTIFICATE AND LT-MARK LICENCE

Suspension of the Certificate and LT-mark licence may be initiated by the ExCoin cases required corrective actions have not been taken as referred or do nothave desired effect, and if total withdrawal is not required.


9/38

9

The ExCo notifies the licensee of the suspension with justification in writing.The licensee is entitled to appeal against the decision within two weeks ofnotification.

13

WITHDRAWAL OF CERTIFICATE AND LT-MARK LICENCE

Withdrawal of the Certificate and LT-mark licence may be initiated by the ExCoin the following cases:- immediately in case of deceit in reporting and documentation of

manufacturer's surveillance, e.g. results recorded without making tests ormeasurements

- if the LT-mark is used on a product for which the Certificate/LT-mark licencewas not granted

- if the manufacturer, regardless of required actions and warnings, does notcorrect basic defects in quality control equipment, performance of

surveillance or it's documentation- if the manufacturer has not ordered the tests required by the ExCo and

delivered the test samples to the test institute within one month- if the products after corrective actions do not meet the specifications set

with respect to basic properties in additional tests or intensified surveillance.

The ExCo notifies the licensee of the withdrawal with justification in writing. Thelicensee is entitled to appeal against the decision within two weeks ofnotification.

The Certificate and LT-mark licence terminates when the appeal period is up or

in case of appeal when the Board has confirmed the withdrawal.

In case of deceit the withdrawal takes effect immediately after notification of thedecision of the ExCo. The Board has the right to notify these cases to themembers of the FEI.

14COMMUNICATIONS, PUBLICATIONS

The ExCo publishes on its internet site (www.energia.fi--> kaukolmp -->

laadunvarmistus ja testaus) lists of Certificates and LT-mark licences once aCertificate is granted or withdrawn, and in January-February every year. In thelatter case also email or paper versions of these lists are sent to all membercompanies of FEI, all certified suppliers and all authorised DH pipe contractors.Pattern of this communication is given in Annex M.

15RESPONSIBILITY FOR PRODUCT QUALITY

The licensee is responsible for the quality of certified/LT-marked products andfor seeing to it that these products meet the relevant specifications of the

standards and recommendations stated in the Certificate in all respects. TheExCo and the governing Board has no financial or other responsibility onproduct quality.


10/38

10

16DOCUMENTATION, RECORDS

The manufacturer shall maintain for a minimum of 5 years records necessary toconfirm that the quality surveillance continually conforms to the requirements.

The Board and the ExCo shall maintain records of their decisions.

17APPEALS AGAINST EXECUTIVE COMMITTEE DECISIONS

Appeals against decisions of the ExCo shall be forwarded within one month tothe ExCo. Appeals will be investigated by the Board as soon as possible.

18COMPLAINTS OF PRODUCT QUALITY

The licensees shall keep record of all quality complaints and remedial actionsto the products covered by the Certificate. This record shall be available to theExCo during inspection visits.

19CONFIDENTIALITY

The information obtained by the ExCo and the Board during it's certificationactivities is confidential.

20

COSTS AND FEES

The manufacturer is responsible for the costs associated with type tests andspot tests in approved Test Institutes, inspection visits by the ExCo and for thefees according to Annex R. The fees cover part of the costs of maintaining andrunning the daily operations of the Scheme. On this basis the fee level isannually determined by the Board.


11/38

Executive committee for quality assurance ANNEX A

19.9.2003

SUPPLEMENTARY REQUIREMENTS OF FEI RECOMMENDATIONS L1/2003 ANDL2/2003 TO EN 253, 448, 488 AND 489

The basis of the FEI Recommendations L1/2003 and L2/2003 are therequirements specified in EN 253, 448, 488 and 489. Following lists give thesupplementary requirements of the Recommendations regarding technicalproperties of the products.

L1/2003 "Preinsulated pipes and fittings"

- DN 20 and DN 32 are not recommended dimensions and can't be qualitymarked.

- In T-pieces the distance between the top of main pipe and the bottom ofbranch pipe shall be 30 mm with a tolerance of 10 mm for branch pipes DN 300 and 50 mm with a tolerance of 25 mm for branch pipes > DN 300.

- Valves in valve fittings DN 200 shall be ball valves

- Special requirements on twin pipe system are included (see Annex S of theScheme Rules).

- The insulation thicknesses are standardised (only these insulation thicknessescan be LT-marked) and the recommended outside diameters of casing are asfollows:

DN 25 125 mmDN 40 140 mmDN 50 160 mmDN 65 180 mm

DN 80 200 mmDN 100 250 mmDN 125 280 mmDN 150 315 mmDN 200 400 mmDN 250 450 mmDN 300 500 mmDN 400 630 mmDN 500 710 mmDN 600 800 mmDN 700 900 mm

DN 800 1000 mmDN 900 1100 mmDN 1000 1200 mmDN 1200 1400 mm


12/38

- Minimum requirement for type tests and manufacturer's quality surveillance isa normative part of the specification.

There are also some other additional requirements having no meaning withrespect to certification, e.g. main dimensions (lengths) of fittings arestandardised.

L2/2003 "Joints for preinsulated pipelines"

- Shrink sleeves (as shrunk) shall overlap both joint casing and pipe casing atleast 100 mm.

- Joint casing shall overlap pipe casing at least 30 mm.

- Wall thickness of PE joint casing (non shrinkable) shall be min. 3 mm.

- Wall thickness of galvanised steel sheet joint casing shall be min. 0,5 mm.

- Special material requirements on shrink sleeve materials and their productionquality surveillance.


13/38

ANNEX B(normative)

FINNISH ENERGY INDUSTRIES RECOMMENDATION L1/2003APPENDIX 2

PREINSULATED PIPES,

MANUFACTURER'S TYPE TEST, ITEMS, TEST METHODS AND ACTIVITIES

Item Test method Activity / procedure

General Manufacturer's production and

quality surveillance processes

Inspection

PE Appearance and surface finish EN 253 Inspection of internal test

records

Diameter, wall thickness ISO 3126 Inspection of internal test

records

Density ISO 1183 Inspection of certificates

and/or internal test records

Thermal stability EN 728 Inspection of certificates


Melt flow rate ISO 1133 Inspection of certificates


Carbon black content ASTM-D-1603 Inspection of certificates


Carbon black dispersion EN 253 Inspection of type test report

or inspection of certificates

(for compound)

Long term mechanical properties

- pressure test (EN 253, 4.3.1.4)

- CLT test (EN 253, 4.3.2.7)

EN 921

EN 253

Inspection of type test report

Elongation at break EN 253 Inspection of type test report

Heat reversion EN 743 Inspection of type test report

PUR Composition EN 253 Inspection of certificates and

internal test records

Cell structure EN 253 Inspection of type test report

Voids and bubbles EN 253 Inspection of type test report

Closed cells ISO 4590 Inspection of type test report

Density ISO 845 Inspection of type test report

Compressive strength ISO 844 Inspection of type test report

Water absorption EN 253 Inspection of type test report


14/38


Pipe and

fitting

assembly

Dimensions and tolerances ISO 3126, EN

253, EN 448

Inspection of internal test

records

Centre line deviation EN 253 Inspection of internal test

records

Outside diameter increase EN 253 Inspection of internal test

records

Shear strength before ageing EN 253 Inspection of type test report

Shear strength after ageing EN 253 Inspection of type test report

Thermal conductivity + PUR

density and cell gas analysis

EN ISO 8497,

EN 253

Inspection of type test report

Impact resistance ISO 3127 Inspection of type test report

Visual appearance of PE-welding EN 448 Inspection of internal test

records

Leak-tightness of PE-welding EN 448 Inspection of internal test

records

Bending resistance of PE-

welding

EN 448 Inspection of type test report

Minimum insulation thickness in

bends

EN 448 Inspection of type test report


15/38

ANNEX C(normative)


JOINTS OF PREINSULATED PIPES,

MANUFACTURER'S TYPE TEST, ITEMS, TEST METHODS AND ACTIVITIES


Joint

construction

Soil stress (sand box test) EN 489 Inspection of type test report

Water impermeability EN 489 Inspection of type test report

PUR Composition and material

properties

EN 489/EN 253 Inspection of documentation

Cell structure EN 489/EN 253 Inspection of type test report

Voids and bubbles EN 489/EN 253 Inspection of type test report

Closed cells EN 489/ISO 4590 Inspection of type test report

Density EN 489/ISO 845 Inspection of type test report

Compressive strength EN 489/ISO 844 Inspection of type test report

Water absorption EN 489/EN 253 Inspection of type test report

Ageing resistance EN 489 Inspection of type test report


16/38

ANNEX D(normative)


PREINSULATED PIPES,

MANUFACTURER'S QUALITY SURVEILLANCE, ITEMS, TEST METHODS, MINIMUM TESTFREQUENCIES AND EQUIPMENT

Item Test method Minimum test frequency Equip-ment

Dimensions of steel parts- outside diameter- wall thickness- angle in bends and

branches

2 %, equally distributed over the yearlyproduction(or receiving inspection)

In case of defect: next 4 similar parts, 8 parts, 16 parts etc.

A, B,C, D,E, F,O, P

Inspection of welds- visual inspection (inconnection to radiographicexamination)

- radiographic examination

EN 448

EN 448

100 % checked by welder, and 2 % inconnection to radiographic examination

- DN 300: 2 %, for each welder,equally distributed over the yearlyproduction

- DN 400: 10 %, for each welder,equally distributed over the yearlyproduction

In case of defect: for the same weldernext 2 parts, 3 parts, 4 parts etc.

Tightness of steel parts- butt welds

- other welds

EN 448DN 300: 20 % pressure test with wateror airDN 400: 20 % pressure test with wateror air, or penetrant examination

DN 300: 100 % pressure test withwater or air

DN 400: 100 % pressure test withwater or air, or penetrant examination

DN 400: 100 % radiographicexamination can replace tightness tests

For butt welds, in case of defect: 100 %2 weeks, 100 % 4 weeks, 100 % 8weeks etc.

K or Q

St.

Wall thickness and ovalityof cold formed bends

2 %, equally distributed over the yearlyproduction

In case of defect: next 4 similar parts, 8 parts, 16 parts etc.

O


17/38

Item Test method Minimum test frequency Equip-ment

Dimensions

- length- outside diameter- wall thickness- squareness of pipe ends

ISO 3126 once per 2 hours for each extruder

B, C,D, E,F, O,P

Melt flow rate ISO 1133 once per raw material delivery/batchor material suppliers certificate

Density ISO 1183 once per raw material delivery/batchor material suppliers certificate

Thermal stability EN 728 once per raw material delivery/batchor material suppliers certificate

Carbon black content ASTM-D-1603

once per raw material delivery/batchor material suppliers certificate

Carbon black dispersion EN 253 - For compound: Once per raw materialbatch or material suppliers certificate- For direct extruder compounding: onceper extruder per week

Elongation at break EN 253 twice a year for each raw material,twice a year for each extruder

Heat reversion EN 743 twice a year for each raw material,twice a year for each extruder

PE

Long term properties- tensile test on test bars(CLT test)

EN 253 once a year for each raw material,once a year for each extruder,totally at least 4 tests a year


18/38

Item Test method Minimum test frequency Equipment

Inspection of reaction

times and free foamdensity

once per raw material delivery/batch C, H,

L

Inspection of machinesettings and productionparameters, inspection ofmixing ratio and MDI-index

once a day for each foaming machine

mixing ratio or MDI-index once a monthfor each foaming machine

H, L

Cell structure, voids andbubbles

EN 253 twice a year for each polyol/isocyanatetypetwice a year for each foaming machine

G

PUR

Closed cells ISO 4590 once a year for each polyol/isocyanatetypetwice a year for each foaming machine

Compressive strength orwater absorption

SFS-ISO 844/ EN 253

once a month for each foaming machine IH

Density SFS-ISO 845 once a shift for each foaming machineand for straight pipes on change ofdimension

C, H


19/38

Item Test method Minimum test frequency Equipment

Appearance, marking 100 % visual inspection

Dimensions andtolerances- insulation free pipe ends- fitting main dimensions- angular deviationbetween service pipe andcasing pipe in fittings- clearance between mainpipe and branch pipe in T-pieces

straight pipes: once a shift for eachdimension

fittings: once a shift for each foamingmachine

AAA, F

A, ForA, N

Centre line deviation EN 253 twice a year for both straight pipes andfittings

A, C

Increase of diameter ofcasing pipe

EN 253 once a shift for each foaming machineand for straight pipes on change ofdimension

E

Minimum insulationthickness in bends

EN 448 twice a year C

PE-weld quality in fittings EN 448 100 % visual inspection

Bending resistance of PE-weld

EN 448 Twice a year for each welding machine J

Function of alarm wires 100 % P

Length difference ofservice pipe ends(twin pipes)



C, F

C, F

Distance between servicepipes(twin pipes)



C

C

Pipe

andfittingassemblies

Twisting of service pipes(twin pipes)

- pipe ends

- within pipe length



twice a year, test pipe DN 50

C, N

C, N

C, N


20/38

EQUIPMENT

A Measuring tape, shortB Measuring tape, long (12...20 m)C TyntmittaD MicrometerE CirkometerF Right-angleG Microscope, illuminated from topH Precision scales (mg)I Machine to measure compressive and tensile force and displacementJ Digital thermometer (0...250 C)K Pressure test equipment and end flanges (DN 20...DN 300)L StopwatchM (Surface tension fluids, full series, when corona treatment is applied on PE-pipe)N Goniometer and/or spirit levelO Equipment to measure wall thickness

P Megger and Ohm meterQ Penetrant set

Pipe and fitting producer shall have equipment to be used in daily measurements, testsand inspections.

Other equipment depending on who performs the tests/measurements in question(pipe/fitting producer or subsupplier of steel/PE components or external test laboratory).


21/38

ANNEX E(normative)

19.9.2003

JOINTS OF PREINSULATED PIPES, HEAT SHRINKABLE MATERIALS

MANUFACTURER'S QUALITY SURVEILLANCE, ITEMS, TEST METHODS AND REQUIREMENTS

Backing material

Item Test method Requirement Minimum test frequency

Material thickness 0,9 mm as unshrinked 1/batch (material orfinished product))

Elongation at break at 23 2 C

250 % 1/batch

Tensile strength at 23 2C

16 MPa 1/batch

Density 0,9 - 1,1 g/cm3 1/batch

Hardness 40 (shore D) 1/batchWater absorption 0,1 % 1/ 3 months

Thermal ageing

- elongation at break- tensile strength

200 %13 MPa

1/year

Solvent resistance

a) petroleum jellyb) sodium hydroxide pH 12c) sulphuric acid pH 2

- elongation at break- tensile strength

200 %13 MPa

1/year

Sealing material

Item Test method Requirement Minimum test frequency

Layer thicknessmastic:- tube sleeve- wraparound sleeve

hot melt:

- tube and wraparoundsleeve

0,9 mm as unshrinked1,1 mm as unshrinked

0,6 mm as unshrinked

1/batch (finished product)

Softening point 70 C 1/batch

Low temperatureresistance

- 25 C 1/batch

Adhesion to polyethylene

a) at 23 2 Cb) after 4 weeksimmersed in water at 50 2 Cc) after 4 weeks in air at70 2 Cd) after 30 sequences(-30 - +70 C)

5 N/10 mm5 N/10 mm, however 50 % of the originaladhesion5 N/10 mm

5 N/10 mm

1/batch1/year

1/year

1/year


22/38

Executive committee for quality assurance ANNEX F

19.9.2003

TESTS AND/OR INSPECTION IN CONSEQUENCE OF MODIFICATIONS

The ExCo decides on the actions required because of changes or modificationsto certified products based on following principles.

Pipes and fittings

When the basic polyethylene raw material or raw material supplier is changed,the following actions are taken:

- If the new raw material is given by its trade name in the list of approved PEraw materials, it can be taken to use by all certified pipe manufacturers. On thefirst production batch all items in accordance with PE type test requirements(see Annex B of the Scheme Rules) shall be tested by the manufacturer orexternal test laboratory and results sent to the ExCo. On the basis of theseresults the ExCo can require certain type tests to be performed in one of the

approved Test Institutes.- If the new material is not on the list of approved materials, the material shalleither have a valid certificate for pressure pipe production (generally known andapproved material), or all items in accordance with PE type test requirementsand cold impact of pipe assembly (see Annex B of the Scheme Rules) shall betested in one of the approved Test Institutes.

When the type of the insulation raw material is changed, the following actionsare taken:

- If the basic foam components (polyol, blowing agent) are changed (e.g. new

raw material supplier) or the foam receipt is significantly modified, all items inaccordance with PUR and Pipe Assembly type test requirements (see Annex Bof the Scheme Rules) shall be tested in one of the approved Test Institutes.

Joint construct ions and materials

In case of significant change or modification in joint construction, in casing jointmaterials or in joint foam components or receipt, new type tests shall beperformed to the extent specified by the ExCo.


23/38

ANNEX G

APPLICATION FOR QUALITY MARK (LT-MARK) LICENCE

Please forward your application to:

Finnish Energy Industries

Veli-Pekka SirolaP.O.Box 100FI-00101 HELSINKI

Appl icant

Company

Post address

Phone Fax

Contact person e-mail

Place of manufacture

Manufacturer(to be filled, if not the same as applicant)

Company

Post address

Phone Fax


Product information

Product group Preinsulated DH pipes and fittings

Documents 1. EN 253, 448, 4882. Finnish Energy Industries Recommendation no L1/20033. Scheme Rules for Quality Assurance and Certification for

preinsulated DH pipe systems

Product (trade name, type, description, PE raw materials and PUR main components used,production range...)

Manufacturer's quality surveillance plan shall be enclosed

Engagement We have studied the Scheme Rules for quality marking of the productsmentioned in this application. Should the mark licence be granted to us, wecomply with the rules mentioned as well as other instructions concerning qualitymarking given by the Board of Quality Assurance for DH Pipes in Finland.

______________________, ___/___ _____, ___________________________________________________Place Date Signature / Name clarification


24/38

ANNEX H

APPLICATION FOR CERTIFICATE

Please forward your application to:

Finnish Energy Industries

Veli-Pekka SirolaP.O.Box 100FI-00101 HELSINKI

Appl icant

Company

Post address

Phone Fax

Contact person e-mail


Manufacturer(to be filled, if not the same as applicant)

Company

Post address

Phone Fax


Product information

Product group Joint materials/constructions for DH pipes

Documents 1. EN 4892. Finnish Energy Industries Recommendation no L2/20033. Scheme Rules for Quality Assurance and Certification

Product (trade name, type, description, production range...)

Manufacturer's quality surveillance plan shall be enclosed

Engagement We have studied the Scheme Rules for certification of the products mentioned inthis application. Should the certificate be granted to us, we comply with the rulesmentioned as well as other instructions concerning certification given by theBoard for Quality Assurance for DH Pipes in Finland.

______________________, ___/___ _____, ___________________________________________________Place Date Signature / Name clarification


25/38

ANNEX I

Executive Committee for Quality Assurance LICENCE NO 1/2006

P A T T E R N

L T - M A R K L I C E N C E

The Executive Committee for the Finnish Quality Assurance System for DistrictHeating Pipes grants this licence based on type tests carried out inindependent laboratories, initial inspection of the manufacturer's production andquality surveillance and annual external quality inspections.

Products: Preinsulated district heating pipes and fittings, singlepipe and twin pipe systems, straight pipes and fittings,cyclopentane-PUR insulation

Manufacturer:

Applicant:

Type test report:

The Executive Committee verifies that these products comply with therequirements given in EN 253 and recommendation L1/2003 published byFinnish Energy Industries.

The licensee is permitted to use the quality mark (LT-mark) registered by theBoard for Quality Assurance for marking and marketing products mentioned inthe licence. This licence is valid only for the place of manufacture mentionedabove.

This marking licence is valid from 31st of January 2006 for one year at a timeprovided that the extent, functioning and results of the manufacturer's quality

surveillance and periodic testing of samples meet the specified requirements.

This licence supersedes licence no 1/2005.

Helsinki, January 31st 2006

EXECUTIVE COMMITTEE FOR QUALITY ASSURANCE

N.N


26/38

ANNEX J

Executive Committee for Quality Assurance CERTIFICATE NO 1/2006

P A T T E R N

C E R T I F I C A T E

The Executive Committee for the Finnish Quality Assurance System for DistrictHeating Pipes grants this certificate based on type tests carried out inindependent laboratories, initial inspection of manufacturer's production andquality surveillance and annual external quality inspections.

Product: PE casing pipe for preinsulated DH pipes

Manufacturer:

Applicant:

Type test report:

The Executive Committee verifies that this product complies with therequirements for casing pipes given in EN 253 and recommendation L1/2003

published by Finnish Energy Industries.

These casing pipes may be used for production of quality marked (LT-mark)district heating pipes.

This certificate is valid from 31st of January 2006 for one year at a timeprovided that the extent, functioning and results of the manufacturer's qualitysurveillance and periodic testing of samples meet the specified requirements.

This certificate supersedes certificate no 1/2005.



N.N


27/38

ANNEX K


P A T T E R N


The Executive Committee for the Finnish Quality Assurance System for DistrictHeating Pipes grants this certificate based on type tests carried out inindependent laboratories.

Product: Joint construction / product

Manufacturer:

Applicant:

Type test report:

The Executive Committee verifies that this product complies with therequirements for joints of preinsulated district heating pipes given in EN 489and recommendation L2/2003 published by Finnish Energy Industries.





N.N


28/38

ANNEX L


P A T T E R N


The Executive Committee for the Finnish Quality Assurance System for DistrictHeating Pipes grants this certificate based on type tests carried out inindependent laboratories.

Product: Joint PUR insulation- mixing ratio, polyol/isoc. xxx/yyy (vol.)

Manufacturer:

Applicant:

Type test report:

The Executive Committee verifies that this product complies with therequirements for the PUR foam in preinsulated district heating pipe joints given

in EN 489 and recommendation L2/2003 published by Finnish EnergyIndustries. This certificate is valid only for PUR foam with above mentionedmixing ratio.





N.N


29/38

ANNEX M

Veli-Pekka Sirola COMMUNICATION Lxx/2006Finnish Energy Industries, District Heating31.1.2006

To member companies

P A T T E R N

Ref: ET-district heating binder 2/11

QUALITY ASSURANCE OF DH PIPE SYSTEMS, LT-MARK LICENCES ANDCERTIFICATES

Enclosed list gives the LT-mark licences and certificates that are valid31.1.2006.

Each licence and certificate defines which product or construction they cover.Manufacturers are allowed to mark their licensed pipes and fittings and shut-offvalves with LT-mark. Heat shrinkable sleeves and other joint materials (whichcan be used in different joint constructions) must not be LT-marked, insteadthey are granted a quality certificate.

Finnish Energy Industries recommends its member companies to buy anduse only LT-marked / certified products. Product certification isrecommended to be part of requirements in the invitation to tenderdocuments. When nevertheless uncertified products are offered by thebidder, this should clearly be stated in the bid.

This communication will be sent to those concerned in the beginning of everyyear. In the meantime the certificate lists are kept up-to-date in internet,www.energia.fi --> kaukolmp --> laadunvarmistus ja testaus.

Further information: Veli-Pekka Sirola, Finnish Energy Industries, tel. +358 9

5305 2303, e-mail: [email protected].

Veli-Pekka Sirola

APPENDIXLists of LT-mark licences and certificates / 31.1.2006


30/38

Executive Committee for Quality Assurance ANNEX N

19.9.2003

INSTRUCTION FOR SPOT TESTING IN CONNECTIONWITH LT-MARK LICENCE (PRODUCT CERTIFICATION)

The following tests according to EN 253 shall be performed on test specimenstaken from a casing pipe or a pipe element marked by the Executive Committeefor Quality Assurance during the inspection visit.

PE casing

Clause 4.2.1.3 Thermal stability4.2.2.6 Heat reversion4.2.2.7 Long term mechanical properties, casing pipe

PUR insulation

Clause 4.3.2 Cell structure4.3.2 Closed cell content

4.3.3.1 Density (core density)4.3.4 Compressive strength4.3.5 Water absorption

Pipe assembly

Clause 4.4.4.2 Axial or tangential or shear strength at 23 C, unaged4.4.4.2 Axial shear strength at 140 C, unaged4.4.6 Impact resistance (ISO 3127:1980)

Test results from the following test institutes are accepted:- FFI, Fernwrme Forschungsinstitut in Hannover E.V., Germany- IMA, Materialfoschung und Anwendungstechnik GmbH, Germany- MPA, Materialprfanstalt fr Werkstoffe des Maschinenwesensund Kunststoffe, Germany- DTI, Danish Technological Institute, Denmark- SP, Swedish National Testing and Research Institute, Sweden- VTT, Technical Research Centre of Finland- Lappeenranta University of Technology, Finland

Tests shall be ordered and test samples delivered to the test institute within one

month. Copy of test report shall be sent to Veli-Pekka Sirola, Finnish EnergyIndustries.


31/38

Executive Committee for Quality Assurance ANNEX O

LIST19.9.2003

(Supersedes list of 5.12.2000)

APPROVED TEST INSTITUTES FOR TESTS ACCORDING TO EN 253, 489

The Board of Quality Assurance for DH pipes in Finland accepts the tests (typetests and external quality control spot tests) performed by test institutes listedhereafter. In practise the acceptance calls for official accreditation for the testsin question. Test pieces must be taken neutrally. The acceptance is valid untilfurther provision.

Tests on PE-casings, PUR-insulation, pipe assemblies and jointconstructions (EN 253, 489)

FFI, Fernwme-Forschungsinst itut in Hannover E.V.Max-von-Laue-Strasse 23D-30966 HEMMINGENGERMANY

DTI, Danish Technological InstituteTeknologiparkenDK-8000 AARHUS CDENMARK

Tests on PE-casings, PUR-insulation and pipe assemblies (EN 253)

SP, Swedish National Testing and Research InstituteBox 24036

S-40022 GOTHENBURGSWEDEN

IMA, Materialfoschung und Anwendungstechnik GmbHBox 80 01 44D-01101 DRESDENGERMANY

MPA, Materialprfanstalt fr Werkstoffe des Machinenwesens undKunststoffeAppelstrasse 11 A

D-30167 HANNOVERGERMANY


32/38

Tests on PUR-insulation, pipe assemblies and joint constructions (EN253, 489)

Lappeenranta University of TechnologyBox 20FIN-53851 LAPPEENRANTAFINLAND

Tests on PE-casings (EN 253)

VTT, Technical Research Centre of FinlandBox 18011FIN-02044 VTTFINLAND


33/38

Executive Committee for Quality Assurance ANNEX P

LIST5.7.2002

(Supersedes list of 12.2.2002)

APPROVED PE-MATERIALS FOR CASING PIPE PRODUCTION

Approval of PE-materials for production of casing pipes to be used in districtheating pipes and fittings certified in accordance with the Finnish qualityassurance scheme (LT-mark licence) calls for either valid certificate forpressure pipe production (generally known and approved material) or PE typetests in accordance with EN 253. Approved materials used can be given in thelist either by name (can be taken to use by all certified casing pipemanufacturers on the conditions given in Annex F of the Scheme Rules) or bycode (if the manufacturer wants to keep the material secret from othermanufacturers), in which case only the Executive Committee for QualityAssurance knows the material behind the code.

Approved PE-mater ials as per 5.7.2002:

Alcudia 3802-N, Repsol Quimica

Alcudia 5300-N, Repsol Quimica

Eltex TUB 131, Solvay

Finathene HP 401, Atofina

Finathene 3802 B, Atofina

Finathene XS 10, Atofina

Lacqtene 2001 TBK 46, Atofina

HDPE BG 10050, Dow Chemicals

HDPE BG 10150, Dow Chemicals

HE 2467-BL, Borealis

HE 3316, Borealis

HE 3470, Borealis

HE 3490, Borealis

HE 3470 LS, Borealis

HE 3490 LS, Borealis

Hostalen GM 5010 T3, Basell

Hostalen CRP 100, Basell


34/38

Marlex TR 480, Phillips Petroleum

ME 2418, Borealis

Novapol HD-2007-H, Novacor Chemicals

Rigidex PC 002-50, BP Amoco

Vestolen A 5061 R, DSM



By code: KPM 101-1

SP-M2-1

TBK-46

Uponor 1

31-10

PE-8

PE-41

PE-55

PE-56


35/38

ANNEX Q

DESIGN OF THE QUALITY MARK, "LT-MARK"


36/38

Executive Committee for Quality Assurance ANNEX R

FEES

Determined by the BoardFebruary 12, 2002

Valid from January 1, 2002

FEES RELATED TO CERTIFICATE AND LT-MARK LICENCE

The fees associated with the scheme are determined by the Board.

Basic application fee

Companies manufacturing/importing preinsulated pipes and fittings are invoiceda basic, one-time application fee when first applying for LT-mark licence. Thisfee, covering part of the development costs of the scheme and administrativecosts of the ExCo related to application and initial inspection, is 2500 . It willbe invoiced in connection with granting the company its first LT-mark licence.

No other application fees are invoiced.

Annual fee

Annual Certificate and LT-mark licence fees are invoiced per product in thebeginning of the year. The fees are as follows:

- LT-mark licence (pipes, fittings) 750 - Certificate (PE casing pipes, joint constructions, joint foam) 350

Inspection and testing fees

The licensee is responsible for meeting all the costs associated with the initialand external inspections, type and spot testing and any special inspection or

testing where necessary (e.g. when dealing with non-compliance to the schemerules or complaints), invoiced by the ExCo or Testing Institute, as applicable.


37/38

ANNEX S19.9.2003

PREINSULATED DH PIPES

Twin Pipe System

There are a few extra requirements for twin pipes (e.g. production tolerances),which are given below. Otherwise requirements, as applicable, of FEIrecommendation L1/2003, part A (conventional pipes) apply.

General Twin pipes are laid with the medium pipes vertically positioned and flow pipeunder return pipe to minimise heat losses.

For some fittings the position of medium pipes might be unclear. These fittingsshall be marked with this information to avoid installation faults (e.g. adaptorsfrom conventional system: flow pipe from right to down).

Casing diameter, insulation th ickness and medium p ipe distance

Standard twin pipe dimensions are given in table 1.

Table 1. Recommended twin pipe dimensions

Steel pipe

DN

PE casing

D (mm)

Insulation thick-

ness (minimum)(mm)

Medium pipe

distance(mm)

25 140 24 19

40 180 29 19

50 200 27 20

65 250 35 20

80 280 34 25

100 355 40 35

125 400 34 40

150 450 30 40

200 560 30 45

Tolerances

Length difference of flow and return pipe ends shall be maximum 1,0 mm.

Tolerance for distance between flow and return pipes shall be 1,0 mm atpipe/fitting ends and 2,0 mm inside pipe/fitting.


38/38

Twisting of medium pipes shall be maximum 3 at pipe/fitting ends and inside"pipes for cutting to length" and maximum 6 inside pipe/fitting.

Production control

To determine cell structure, density, compressive strength and waterabsorption of the PUR foam, two test specimens (at "3 and 9 o'clock") insteadof three shall be taken from both ends of the pipe/fitting.

Minimum test frequencies of above mentioned tolerances:

Pipe assembly,twin pipes

Item Minimum test frequency

Length difference ofservice pipe ends

straight pipes: once a shift for each dimension

fittings: once a shift for each foaming machine

Distance between servicepipes



Twisting of service pipes

- pipe ends

- inside pipe length



twice a year, test pipe DN 50

Date post:	02-Jun-2018
Category:	Documents
Upload:	zeljko-ristic
View:	217 times
Download:	0 times