KE 154 GASTEC QA Approval Requirements 154

Transcription

1 KE 154 March 2012 GASTEC QA Approval Requirements 154 for the GASTEC QA product certificate for insulation union couplings in gas conduits up to 50 mm nominal diameter

2 Foreword These GASTEC QA Approval requirements have been accepted by the Board of Experts of the GASTEC QA Quality Mark, wherein all the relevant parties in the field of gas related products are represented. This Board of Experts also supervises the certification activities and where necessary require the GASTEC QA Approval Requirements to be revised. All references to Board of Experts in these GASTEC QA Approval requirements pertain to the above mentioned Board of Experts. These GASTEC QA Approval requirements will be used by Kiwa Nederland B.V. in conjunction with the Kiwa regulations for carrying the GASTEC QA Quality mark. This regulation details the method employed by Kiwa Nederland B.V. for conducting the necessary investigations prior to issuing the (technical approval-with) product certificate and the method of external control. The inspection frequency is determined by the above mentioned Board of Experts. Approved by Board of Experts : February 15 th 2012 Accepted by Kiwa Nederland B.V. : March 15 th 2012 Kiwa Nederland B.V. Wilmersdorf AC Apeldoorn Postbus AC Apeldoorn The Netherlands Tel Fax Kiwa Nederland B.V. All rights reserved. No part of this book may be reproduced, stored in a database or retrieval system, or published, in any form or in any way, electronically, mechanically, by print, photoprint, microfilm or any other means without prior written permission from the publisher. The use of this evaluation guideline by third parties, for any purpose whatsoever, is only allowed after a written agreement is made with Kiwa to this end. Kiwa Nederland B.V March 2012

3 Contents 1 Introduction General Scope Acceptance of test reports provided by the supplier Definitions Bending moment Compressive force Creepage distance Clearance distance Maximum pressure Test voltage Torsional moment Tensile force 8 2 Product Requirements Introduction General Error-free installation Durability Materials Fit for use Resistance to gas Rubber quality Metals Construction Resistance to loads Diameter Threaded connections Use in metal components Insulation Dimensions Leak tightness Design of the insulation components Clearance and creepage distances Dirt protected clearance and creepage distances Effectiveness of the insulation Resistance to 500 V DC Resistance to 2500 V AC Resistance against effect of elevated temperature Marking and documentation 11 Kiwa Nederland B.V March 2012

4 Marking on union couplings Instructions 11 3 Testing methods Sequence Components of the insulation union coupling Visual inspection Testing the insulation and leak tightness when applying mechanical loads Test pressure Leak tightness test methode Leak tightness when tightened with specified torque Leak tightness after exposure to loads Insulation and leak tightness during and after bending Effectiveness of the insulation at high humidity Resistance to high temperature Resistance to liquid pentane 13 4 Quality system requirements General Manager of the quality system Internal quality control/quality plan Procedures and work instructions Other Quality system requirements 14 5 Summary of tests and inspections Test matrix insulation union couplings in gas conduits up to 50 mm nominal diameter Evaluation of the quality system Frequency of external audits 16 6 Agreements on the performance of certification General Certification staff Qualification requirements for executive staff of CI that fulfil the requirements of EN Qualification requirements for executive staff of a CI that are in addition set up by the Board of Experts for the subject of this evaluation guideline Qualification 18 7 List of mentioned documents Standards/ normative documents Replacement(s) of standard/ normative documents 19 Appendix A: Model IQC-scheme or frame-iqc-scheme Appendix B: Model Certificate Kiwa Nederland B.V March 2012

5 Summary of changes Paragraph Change 1.1 A general introduction is included, replacing the 1976 foreword. 1.2 The definition in former chapter 1 has been included in par. 1.2 Scope. The term isolation piece has been replaced by isolation union coupling. Because an isolation union coupling always has threaded connections, the term with threaded connections has been omitted. The term not to be installed in the ground has been replaced by to be installed inside buildings. Differences between Approval Requirements 154 and 61 are explained. New added: the appropriate gas families. 1.3 A clause regarding the acceptance of test reports provided by the supplier is included 0 Ch.3 has become par. 0 2 Ch.4 has become ch. 2. Paragraphs have been regrouped and numbering of paragraphs has been changed likewise. 2.1 New added: an introduction to product requirements. 2.3 (formerly 4.2) Added to material requirements: paragraph with rubber quality; paragraph with metals (formerly 4.3.1) The unclear meaning of CA 20 0 C has been replaced by minus 5 0 C in the second last column, and by 23 0 C in the last column. Tolerances in the temperatures have been added as well (formerly 4.4.1) Added: The purpose of the threaded connections should not be to create a leak tight sealing. NEN 3258 and NEN 176 have been replaced by respectively EN and NEN-EN- ISO New: paragraph with requirements for the dimensions of the threaded connections. 2.6 (formerly 4.5.1) The requirements for gas tightness -20 C to C has been replaced by -5 C (minus 5 0 C) to C (formerly 4.1.3) Added: Marking should also include the Gastec QA word mark or logo (formerly 4.1.4) The sentence not to be installed in the ground has been replaced by to be installed inside buildings. Added: The manufacturer shall also supply assembly instructions in Dutch. And The installation instructions prescribe the torque to tighten the insulation union coupling. Removed: former par which stated: The layer thickness of clamped rubber shall be greater than or equal to the layer thickness of the plastic that is encased. 3 Ch.5 has become ch.3. Numbering of paragraphs has been changed likewise. No substantive changes except par (formerly 5.2.1): Added a comment to check the dimensions of the threaded connections Added: a paragraph on the leak tightness test method Added: a paragraph on testing when the union coupling is tightened with a specified high torque. Added: the force with which the union coupling should be tightened during the other tests (formerly 5.3.2): The leak tightness tests have been changed at the following points: 1) Measuring the leakage is not done anymore during the exposure with loads, but afterwards. 2) The leak tightness tests will be performed at three different temperatures. 3) The method of leak tightness testing is no longer prescribed (e.g. in water or with leak spray), but the amount of leakage is prescribed. 4) Temperatures have been changed, according to changes in previous paragraphs. 5) Former test a (no load applied): has been omitted. Numbering of tests has been adapted accordingly. 6) Test c (formerly test d): the tensile force of 1 kn has been omitted (formerly 5.3.2): Type error in formula for M b had been corrected. Last sentences have been changed in order to make clearer when the load shall be applied and taken away. Added: the testing temperatures. 3.6 (formerly 5.51) Removed: Rubber should be tested to liquid pentane. Instead par with rubber quality has been added. The testing method is explained more clearly. 4 New chapter quality system requirements included 0 Summary of tests and inspections included Kiwa Nederland B.V March 2012

6 Paragraph Change 6 Agreements on the performance of certification included 7 List of referenced documents included Appendix Model of IQC-scheme included A Appendix Model Certificate included B Kiwa Nederland B.V March 2012

7 1 Introduction 1.1 General These GASTEC QA Approval requirements replace the GASTEC QA Approval requirements 154, for the GASTEC QA product certificate for loose insulation pieces in gas conduits up to 50 mm nominal diameter, dated May Note: the title of the Approval Requirements has been changed slightly. The term loose insulation pieces has been replaced by insulation union coupling in order to specify better the scope of the Approval Requirements. During the execution of the certification work, Kiwa Nederland B.V. is bound to the Kiwa regulations for carrying the Gastec QA quality mark. 1.2 Scope An insulation union coupling is understood to mean a part of a gas conduit for the distribution of natural gas and LPG in gaseous phase, with which a removable pipe connection is created that is not electrically conductive. These criteria apply to insulation union couplings that are installed inside buildings, after the main shutoff valve. The insulation union couplings have a maximum nominal diameter of 50 mm. The insulation union couplings can be supplied as a loose unit or in combination with devices, and are used in gas conduits that are suitable for gas pressure up to 1 bar. The difference in scope between these Approval Requirement and Gastec QA Approval Requirements 61, for the GASTEC QA product certificate for loose insulation pieces in gas conduits up to 50 mm nominal diameter, is as follows: Approval requirements 61 deal with pieces consisting of one part, non-removable, while Approval requirements 154 deal with union couplings consisting of two removable parts. Approval requirements 61 deal with insulation pieces applicable both before and after the main shutoff valve, while Approval requirements 154 deal with union couplings applicable only after the main shutoff valve. The union couplings are for use in gas installations for 2 nd family gases (natural gas) and 3 rd family gases (liquefied petroleum gas- LPG) according to NEN-EN 437. The specific functional recommendations for application of insulation pieces, like these union couplings, in gas systems are described in NEN 7244 and national and international standards and/or regulations. 1.3 Acceptance of test reports provided by the supplier The rules for acceptance of test reports provided by the supplier are laid down in the Regulations for Product Certification for carrying the GASTEC QA quality mark. 1.4 Definitions Bending moment The bending moment is the moment with which the insulation union coupling is loaded to cause bending, taking into account the set conditions Compressive force The compressive force is the force with which the insulation piece is axially loaded during testing Creepage distance The creepage distance is, with regard to the surface of the insulation part, the shortest distance between the electrically conductive parts of the insulation union coupling Clearance distance The clearance distance is the shortest straight unimpeded distance measured between the electrically conductive components of the insulation union coupling. Kiwa Nederland B.V March 2012

8 1.4.5 Maximum pressure The maximum pressure is the air pressure at which the insulation union coupling is tested Test voltage The AC voltage set for the test is the effective value of this AC voltage that is applied during the test period Torsional moment The torsional moment is the moment with which the insulation union coupling is loaded for torsion, taking into account set conditions Tensile force The tensile force is the force with which the insulation union coupling is axially loaded with tension during the test. Kiwa Nederland B.V March 2012

9 2 Product Requirements 2.1 Introduction In this chapter the performance requirements imposed on insulation union couplings in gas conduits up to 50 mm nominal diameter in contact with 2 nd and 3 rd family gases are included, as well as the determination methods in order to be able to determine whether the requirements are fulfilled. 2.2 General Error-free installation The insulation union coupling shall be made in such a way that errors during installation that jeopardize the function of the insulation union coupling are not possible Durability The insulation union coupling shall be made in such a way that that the proper functioning and durability are ensured under normal use. 2.3 Materials Fit for use The quality and thickness of the materials used shall be such that they can withstand the mechanical, chemical and thermal forces Resistance to gas Components of the insulation union coupling that come into contact with the gas flowing through shall be resistant against the action of the gas Rubber quality Rubber components in the couplings shall comply with NEN-EN 682, type GAL (for Gaseous fuel, -15 to 50 0 C) and type GBL (Hydrocarbon fluids and gaseous fuel, -15 to 50 0 C), or to NEN-EN 549 Class A2 (-20 to 60 0 C) Metals Metal pieces shall be made from brass as specified in European product requirements for copper alloys or registered by CEN/TC 133 or from steel with a minimum tensile strength of 350 N/mm 2, provided that the union couplings manufactured from them meet the functional requirements of these Approval Requirements. 2.4 Construction Resistance to loads The construction shall be such that all the components of the insulation union coupling are resistant against the loads as listed in table 1. Kiwa Nederland B.V March 2012

10 Table 1: Resistance to loads nominal diameter in mm tensile force compressive force in N torsional moment in Nm bending moment in Nm at 50 ± 3 C at -5 ± 3 C at 23 ± 3 C If angular deviation of 45 0 between the two halves of the insulation union coupling is reached before reaching the torsional moment according to table 1, the torsional moment that caused this 45 0 angular deviation will suffice Diameter The diameter of the opening of the insulation union coupling shall at no point be smaller than 0.75 x the greatest nominal diameter. 2.5 Threaded connections Use in metal components The threaded connections shall only be installed in metal components Insulation The threaded connections shall be made in such a way that no electrical contact of the insulated components can be made after installation Dimensions The dimensions of the threaded connections of the coupling nut and the coupling bolt shall be compatible with NEN 2542 or shall conform to the Dutch Code of practice NPR 7028:2008. In case the insulation union coupling is a loose part with a gas-tight screw-thread connection at the other end as well, the gas-tight screw-thread connection shall be made according to NEN-EN When a screw-thread connection is applied, the inlet and/or outlet concerned shall be provided with points where mounting tools can be made to engage. 2.6 Leak tightness The insulation union coupling shall be externally gas tight at temperatures of -5 C, 23 C and to C. At these temperatures the union couplings shall be gas tight when the union coupling is fastened with a torque of 6 Nm per mm of the nominal diameter, and when the union coupling is fastened according to the instructions of the manufacturer. 2.7 Design of the insulation components Clearance and creepage distances The insulation components shall be designed in such a way that the clearance and creepage distances are at least 3 mm. Kiwa Nederland B.V March 2012

11 2.7.2 Dirt protected clearance and creepage distances Unlike is stated in paragraph 2.7.1, clearance and creepage distances that are protected against dirt deposits shall be at least 2 mm. 2.8 Effectiveness of the insulation Resistance to 500 V DC When a DC voltage of 500 V is applied, the resistance shall be at least 100 kω Resistance to 2500 V AC No insulation breakdown and/or arcing shall occur when an AC voltage of 2500 V 50 Hz is applied. 2.9 Resistance against effect of elevated temperature The insulation union coupling shall be made of incombustible materials capable of withstanding a temperature of C for 900 s without the cohesion of the coupling being adversely affected Marking and documentation Marking on union couplings A permanent inscription shall be placed on each insulation union coupling in a clearly visible location that includes the following information: 1. the GASTEC QA word mark or logo; 2. nominal dimensions in mm; 3. the name of the manufacturer or the trademark; 4. a type indication; 5. the flow direction if not intended for two directions Instructions The manufacturer shall also supply assembly instructions in Dutch. Installation instructions shall be provided for every insulation union coupling. If the insulation union coupling consists of separate components, the assembly of the separate components shall be clearly indicated in the installation instructions. At the same time, it shall be stated that the insulation union couplings shall not be contaminated during assembly. These insulation union couplings shall be installed inside buildings and shall be installed after the main shutoff valve. The installation instructions prescribe the torque to tighten the insulation union coupling. Kiwa Nederland B.V March 2012

12 3 Testing methods 3.1 Sequence The inspection of the insulation union coupling shall be done in the sequence indicated. 3.2 Components of the insulation union coupling Visual inspection The inspection of the insulation union coupling is done visually and using measurement equipment. In this, it is particularly important to note the dimensions stated in paragraph for the threaded connections and in paragraph for the clearance and creepage distances. 3.3 Testing the insulation and leak tightness when applying mechanical loads Test pressure Air at 1.1 barg pressure (overpressure) is used as a medium for testing Leak tightness test methode The leak tightness tests may be carried out by those methods used in national laboratories, providing these methods give reproducible results. The uncertainty of measurement shall not be greater then 5 cm 3 /h and the resolution shall be 1 cm 3 /h Leak tightness when tightened with specified torque The insulation union coupling shall be tightened with a torque of 6 Nm per mm of the nominal diameter. A leak tightness test is performed during 600 s at a temperature of 23 ± 3 C. During this test, the leakage rate shall be less then 30 cm 3 /h. Afterwards the union coupling shall be loosened. During the tests as described in par to 3.5, the union coupling shall be fastened according to the instructions of the manufacturer Leak tightness after exposure to loads The testing of the insulation union coupling for gas-tightness is done by placing the insulation union coupling in an oven at a temperature of 120 C. Once the insulation union coupling has reached a temperature of 120 C, it is kept at this temperature for 300 s and then cooled to room temperature in still air. Then the following loads will be applied successively: a. An axial tensile force in accordance with table 1 during 600 s at a temperature of 23 ± 3 C. b. An axial compressive force in accordance with table 1 during 600 s at a temperature of 23 ± 3 C. c. A torsional moment in accordance with table 1 or a torsional moment corresponding to an angular deviation of First during 600 s at a temperature of 50 ± 3 C, then during 600 s at a temperature of -5 ± 3 C. After the last load has been removed, three gas-tightness tests are performed during 600 s each at temperatures of - 5 ± 3 C, 23 ± 3 C and +50 ± 3 C. During each of the leak tightness tests, the leakage rate shall be less then 30 cm 3 /h Insulation and leak tightness during and after bending The test piece from paragraph c is then blown dry and stored for 24 hours in a chamber with a relative humidity of 40%. At a temperature of 23 ± 3 C, the test piece is then loaded with a bending moment in accordance with Table 1. For the test, the test piece is placed on two support points and loaded in the middle of the support spacing. The support points are positioned 800 mm from each other. First, the test pressure is applied. The load P is increased every minute by 20% of its end value and registered using a recorder that is connected. For the chosen test setup, the following applies to the bending moment M b: Kiwa Nederland B.V March 2012

13 M b = P L/4 If L = 0.8 then M b = 0.2 P in Nm; load P = 5 M b in N. During a test period of 300 s, no short circuit shall occur in the insulated part (to be checked with 24 V AC voltage). The leak tightness is then tested for 600 s while applying the load. The leakage rate shall be less then 30 cm 3 /h. After that the load is removed. The leak tightness is then tested for 600 s at temperatures of -5 ± 3 C, 23 ± 3 C and +50 ± 3 C. The leakage rate shall be less then 30 cm 3 /h. 3.4 Effectiveness of the insulation at high humidity For testing, the insulation union coupling mentioned in paragraph 3.3 is blown dry and placed in a chamber for 48 hours at a temperature of 23 ± 3 C and a relative humidity of 93% to 95%. The insulation union coupling shall take up a maximum of 1/10th of the volume of the chamber. Immediately after the insulation union coupling is taken out of the chamber, it is subjected to a DC voltage of 500 V, with the resistance being measured. This electrical resistance shall be at least 100 kω. The insulation union coupling is then subjected to an AC voltage of 2500 V, 50 Hz. The voltage is increased in 10 s from 0 to 2500 V. The voltage is maintained for 60 s. No insulation breakdown or arcing shall occur during the test. 3.5 Resistance to high temperature The insulation union coupling is placed in an oven at a temperature of 425 C ± 10 C for 900 s. The cohesion of the coupling being shall not be adversely affected. 3.6 Resistance to liquid pentane Resistance against the action of liquid pentane is determined for components made of plastic. Two test pieces of about 2 grams with an thickness of about 2 mm (if necessary the entire component) are weighed to 0.1% accuracy after which they are submerged in liquid pentane at room temperature for 3 x 24 hours. The volume of the pentane shall be at least 25 x the volume of the test piece. Immediately after the test pieces are removed from the pentane, and dried with filter paper if necessary, the weight is determined to 0.1% accuracy. The weight change shall be no more than the following relative to the original weight: 15% weight for components that provide external gas-tightness, 20% for other components; The test piece is then stored for 24 hours at room temperature and the weight is again determined to 0.1% accuracy. The weight change shall be no more than the following relative to the original weight: 10% for components that provide external gas-tightness, 15% for other components. Kiwa Nederland B.V March 2012

14 4 Quality system requirements 4.1 General This chapter contains the requirements that have to be fulfilled by the manufacturer s quality system. 4.2 Manager of the quality system Within the manufacturer s organisational structure an employee must be appointed who is in charge of managing the quality system. 4.3 Internal quality control/quality plan As part of the quality system the manufacturer must implement an internal quality control schedule (IQC-scheme). In this IQC-scheme the following must be demonstrably recorded: which aspects are inspected by the manufacturer; according to which methods these inspections are carried out; how often these inspections are carried out; how the inspection results are registered and stored. This IQC-schedule shall be in the format as shown in the annex. The schedule must be detailed in such a way that it provides Kiwa sufficient confidence that requirements will be continuously fulfilled. 4.4 Procedures and work instructions The manufacturer must be able to submit: Procedures for: - the handling of non-conforming products; - corrective actions in case non-conformities are found; - the handling of complaints regarding the products and / or services supplied; the work instructions and inspection sheets in use instructions for packaging and closing off of products during storage and transport. 4.5 Other Quality system requirements The quality system of the production location shall be ISO 9001 certified. The ISO 9001 quality system may be combined with the IQC scheme. Kiwa Nederland B.V March 2012

15 5 Summary of tests and inspections This chapter contains a summary of tests and inspections to be carried out during: Initial evaluation: the investigation necessary in order to determine whether all requirements of the evaluation guideline are fulfilled, Inspection visit: the surveillance inspections carried out after issuing the certificate in order to determine whether the certified products continuously fulfil the requirements of this evaluation guideline. The inspections are carried out according to the frequency indicated. Inspection of the quality system: inspection with regard to the correct implementation of the IQC-schedule and procedures. 5.1 Test matrix insulation union couplings in gas conduits up to 50 mm nominal diameter Description of requirement Clause guideline or standard Test within the scope of Initial evaluation Surveillance by CI after issue of the certificate 1) tests Inspection 2) Frequency General requirements to be met by the 2.2 insulation union coupling Error-free installation X Durability X Visual inspection X X once a year Materials & construction Fit for use X Resistance to gas X Rubber quality X X once a year Metals X Diameter X Threaded connections 2.5 X X once a year Use in metal components X Insulation X X once a year Dimensions X Design of the insulation components 2.7 X Clearance and creepage distances X X once a year Dirt protected clearance and creepage distances X X once a year Marking on union couplings X X once a year Instructions X X once a year Testing Leak tightness when tightened with specified torque X X once a year Leak tightness after exposure to loads X X once a year Insulation and leak tightness during and after X X once a year bending Effectiveness of the insulation at high humidity 3.4 X X once a year Resistance to high temperature 3.5 X X once a year Resistance to liquid pentane 3.6 X 1) In case the product or production process changes significantly, the performance requirements shall be determined again with respect to paragraph 13 of the Kiwa regulations for product certification. 2) All product properties that can be determined within the visiting time (maximum 1 day) are determined by the inspector or by the supplier in the presence of the inspector. In case this is not possible, an agreement will be made between the certification body and the supplier about how the inspection will take place. Kiwa Nederland B.V March 2012

16 5.2 Evaluation of the quality system During each inspection visit the quality system of the supplier shall be examined and evaluated. 5.3 Frequency of external audits The frequency of external audits is set at 2 audits per year at the production location and/or supplier. Kiwa Nederland B.V March 2012

17 6 Agreements on the performance of certification 6.1 General This chapter contains the by the Board of Experts elaborated agreements on the performance of certification by Kiwa. 6.2 Certification staff The staff involved in the certification process is sub-divided into: Certification engineers: in charge of carrying out the pre-certification tests and assessing the reports of the inspectors; Inspectors: in charge of carrying out external inspections at the supplier s works; Decision-makers: in charge of taking decisions in connection with the pre-certification tests performed, continuing the certification in connection with the inspections performed and taking decisions with regard to corrective actions. 6.3 Qualification requirements for executive staff of CI that fulfil the requirements of EN The qualification of the executive staff of a CI must fulfil the requirements of EN The way qualification of the staff is performed must be described in the quality manual of the CI. EN45011 Auditor (A) pre-certification tests and inspections of companies Inspector (B) factory, field & project visits and follow-up inspections Decision maker (C) person deciding on granting of certificate 1 Education, general 2 Education, specific 3 Experience, general 4 Experience, specific Relevant tech. thinking and working level comparing to Bachelor Internal training in certification and Kiwa policies Training in audit skills Training geared towards this guideline Specific courses and training (knowledge and skills) 1 year of relevant working experience with a minimum of 4 tests of which: 1 complete precertification test independently, under supervision Detailed knowledge of certification and 4 tests relating to this specific guideline or to guidelines which are related to each other. Tech. thinking and working level at vocational education (intermediate level) Internal training in certification and Kiwa policies Training in audit skills Training geared towards this guideline Specific courses and training (knowledge and skills) 1 year of relevant working experience with a minimum of 4 tests, 1 of which independently, under supervision Detailed knowledge of certification and 4 tests relating to the specific guideline or to guidelines which are related to each other Thinking and working at Bachelor level Internal training in certification and Kiwa policies Training in audit skills not applicable 4 years of working experience, with a minimum of 1 year of experience with certification Basic knowledge of the specific certification 6.4 Qualification requirements for executive staff of a CI that are in addition set up by the Board of Experts for the subject of this evaluation guideline No additional requirements are set up by the Board of Experts. Kiwa Nederland B.V March 2012

18 6.5 Qualification Certification staff must be demonstrably qualified by evaluation of education and experience of the above-mentioned requirements. In case qualification takes place on the basis of other criteria, then this has to be recorded in writing. The authority for qualification rests with: Decision-makers: qualification of the certification experts and inspectors; Management of the certification body: qualification of the decision-makers. Kiwa Nederland B.V March 2012

19 7 List of mentioned documents 7.1 Standards/ normative documents All normative references in this Approval Requirements refer to the editions of the standards as mentioned in the list below. Sorted by number: NEN-EN-ISO 228-1:2003 NEN-EN 437:2003+A1:2009 NEN-EN 549:1995 NEN-EN 682:2002+A1:2005 NEN 2542:1967 NPR 7028:2008 NEN :2005 NEN :2010 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation Test gases - Test pressures - Appliance categories Rubber materials for seals and diaphragms for gas appliances and gas equipment Elastomeric seals - Materials requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids Fittings and connections with outside thread for gas conduits Gas meters - Dimensions and connections Gas supply systems - Pipelines for maximum operating pressures up to and including 16 bar - Part 6: Specific functional requirements for service lines Gas supply systems Pipelines for maximum operating pressure up to and including 16 bar Part 10: Specific functional requirements for housing for installations and housing for meters with a maximum inlet pressure of 100 mbar and a maximum design capacity of 650 mn 3 /h NEN-EN :2004 Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and design. 7.2 Replacement(s) of standard/ normative documents Sorted by number: Old Document Replaced by Replacement s title NEN 176:1972 Fastening pipe thread - Basic dimensions NEN-EN-ISO Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances NEN 3258:1972 Pressure-tight pipe thread EN :2004 (for R & Rp threads) and designation Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and design. Kiwa Nederland B.V March 2012

20 I Appendix A: Model IQC-scheme or frame-iqcscheme Subject Aspect Method Frequency Registration Incoming control supplied materials Compound Material data sheets Material Certificates Production process Procedures Work instructions Used apparatus Finished product inspection Manufacture Applied inspection methods Inspection frequency Registration and Recording inspection results. Appearance Marking Contamination Status of measuring and test equipment Measure equipment Test equipment Calibration Logistics Procedure non conforming Complaints procedure Internal transport Storage Packaging Preservation Identification Marking Registration and Recording Settlement Registration and Recording Settlement Kiwa Nederland B.V March 2012

21 Number Replaces -- Issued Scope KE 154 Report number Page Contract number Product Certificate Insulation union couplings in gas conduits up to 50 mm nominal diameter Based on pre-certification tests as well as periodic inspections by Kiwa Nederland B.V., the products referred to in this certificate and marked with the GASTEC QA mark, supplied by Manufacturer may, on delivery, be relied upon to comply with the GASTEC QA Approval Requirements 154, Insulation union couplings in gas conduits up to 50 mm nominal diameter. Bouke Meekma Kiwa This certificate is issued by Kiwa Nederland B.V. in conjunction with the Kiwa Regulations for carrying the GASTEC QA quality mark. This certificate consists of.. pages. Publication of the certificate is allowed. Kiwa Nederland B.V. Wilmersdorf 50 P.O. Box AC APELDOORN The Netherlands Tel Fax Company..... P.O. Box T F Kiwa Nederland B.V March 2012

22 Insulation union couplings in gas conduits up to 50 mm nominal diameter PRODUCT SPECIFICATION APPLICATION AND USE An insulation union coupling is understood to mean a part of a gas conduit for the distribution of natural gas and LPG in gaseous phase, with which a removable pipe connection is created that is not electrically conductive. The insulation union couplings will be installed inside buildings after the main shutoff valve. The insulation union couplings have a maximum nominal diameter of 50 mm. The insulation union couplings can be supplied as a loose unit or in combination with devices, and are used in gas conduits that are suitable for gas pressure up to 1 bar. MARKING The products are clearly visible marked with the following information: a) the GASTEC QA word mark or logo; b) nominal dimensions in mm; c) the name of the manufacturer or the trademark; d) a type indication; e) the flow direction if not intended for two directions. Place of the mark: on each insulation union coupling Compulsory specifications: Method of marking: Permanent marking. RECOMMENDATIONS FOR CUSTOMERS: 1. Check at the time of delivery whether: 1.1 The manufacturer or supplier has delivered in accordance with the agreement; 1.2 the mark and the marking method are correct; 1.3 the products show no visible defects as a result of transport etc. 3. Consult the producer's processing guidelines for the proper storage and transport methods. 2. If you should reject a product on the basis of the above, please contact: 2.1 Manufacturer and, if necessary, 2.2 Kiwa Nederland B.V. 4. Check whether this certificate is still valid by consulting Kiwa Nederland BV or the Kiwa website. Kiwa Nederland B.V March 2012