SIST EN 13611:2008
Safety and control devices for gas burners and gas burning appliances - General requirements
Safety and control devices for gas burners and gas burning appliances - General requirements
This European Standard deals with the safety, construction and performance requirements of safety, control or regulating devices and sub-assemblies or fittings (hereafter referred to as controls) for burners and gas- burning appliances using fuel gases of the 1st, 2nd or 3rd families and to their testing.
This European Standard is to be used in conjunction with the specific control standard.
When no particular control standard exists, the control can be tested according to this standard and further tests taking into account the intended use.
Controls to which this European Standard applies include the following:
- Automatic shut-off valves;
- Burner controls
- Electronic control
- Flame supervision devices;
- Gas/air ratio controls;
- Pressure Governors;
- Manual taps;
- Mechanical thermostats;
- Multifunctional controls;
- Pressure sensing devices;
- Valve proving systems;
- Zero governors
The methods of test given in this standard are intended for product type testing. Tests intended for production testing are not specifically included.
The decision was taken by unanimity.
Sicherheits-, Regel- und Steuereinrichtungen für Gasbrenner und Gasgeräte - Allgemeine Anforderungen
Diese Europäische Norm befasst sich mit den Anforderungen an Sicherheit, konstruktive Ausführung und Leistung von Sicherheits-, Regel- oder Steuereinrichtungen und Baugruppen oder Zubehör (im Folgenden als Regel- und Steuergeräte (RS) bezeichnet) für Brenner und Gasgeräte mit Brenngasen der 1., 2. oder 3. Familie und deren Prüfung.
Diese Europäische Norm gilt in Verbindung mit der betreffenden Norm für Regel- und Steuergeräte.
Wenn keine spezielle Norm für Regel- und Steuergeräte vorhanden ist, darf das Regel- und Steuergerät (RS) nach vorliegender Norm geprüft werden, und in weiteren Prüfungen wird der vorgesehene Verwendungszweck berücksichtigt.
Diese Europäische Norm gilt für Regel- und Steuergeräte einschließlich der folgenden:
- automatische Absperrventile;
- Feuerungsautomaten;
- Flammenüberwachungseinrichtungen;
- Gas-Luft-Verbundregler;
- Druckregler;
- Handbetätigte Einstellgeräte;
- mechanische Temperaturregler;
- Mehrfachstellgeräte;
- Druckwächter;
- Ventilüberwachungssysteme für automatische Absperrventile;
- Nulldruckregler.
Die Prüfungen, die in dieser Norm genannt sind, dienen der Typprüfung. Spezielle Fertigungsprüfungen sind nicht Bestandteil dieser Norm.
Equipements auxiliaires pour bruleurs a gaz et appareils et appareils a gaz - Exigences générales
La présente Norme européenne est relative à la sécurité, à la construction et au fonctionnement des dispositifs de sécurité, de contrôle, de réglage et les sous-ensembles ou accessoires (désignés ci-après par le terme « équipements ») pour les brûleurs à gaz et les appareils à gaz utilisant des combustibles gazeux des première, deuxième et troisième familles et à leurs essais.
Les équipements auxquels la présente Norme européenne s'applique comprennent les suivants :
les robinets automatiques de sectionnement ;
les systèmes automatiques de commande de brûleur ;
les dispositifs de surveillance de flamme ;
les dispositifs de régulation du rapport air/gaz ;
les régulateurs de pression ;
les robinets manuels ;
les thermostats mécaniques ;
les robinets multifonctionnels ;
les dispositifs de surveillance de pression ;
les dispositifs de vérification d'étanchéité des robinets ;
les détendeurs à pression atmosphérique.
Les méthodes d'essai données dans la présente norme sont destinées à l'essai de type du produit. Pour les alimentations en courant continu, l’Annexe I s’applique.
NOTE 1 Quand il n’existe pas de norme particulière pour l’équipement, l’équipement peut être testé conformément à cette norme et à des essais complémentaires prenant en compte l’usage auquel il est destiné.
NOTE 2 Il convient d’utiliser cette Norme européenne en relation avec les normes d’équipement spécifiques (voir bibliographie).
Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - Splošne zahteve
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - Splošne zahteveSicherheits-, Regel- und Steuereinrichtungen für Gasbrenner und Gasgeräte - Allgemeine AnforderungenEquipements auxiliaires pour bruleurs a gaz et appareils et appareils a gaz - Exigences généralesSafety and control devices for gas burners and gas burning appliances - General requirements27.060.20Plinski gorilnikiGas fuel burners23.060.40Pressure regulatorsICS:Ta slovenski standard je istoveten z:EN 13611:2007SIST EN 13611:2008en,fr,de01-december-2005SIST EN 13611:2008SLOVENSKI
STANDARDSIST EN 13611:2002/A1:2005SIST EN 13611:20021DGRPHãþD
SIST EN 13611:2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13611November 2007ICS 23.060.40Supersedes EN 13611:2000
English VersionSafety and control devices for gas burners and gas burningappliances - General requirementsEquipements auxiliaires pour brûleurs à gaz et appareils àgaz - Exigences généralesSicherheits-, Regel- und Steuereinrichtungen fürGasbrenner und Gasgeräte - Allgemeine AnforderungenThis European Standard was approved by CEN on 7 October 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13611:2007: ESIST EN 13611:2008
EN 13611:2007 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions`.6 4 Classification.10 5 Units of measurement and test conditions.11 6 Construction requirements.12 7 Performance.22 8 EMC/Electrical requirements.33 9 Marking, installation and operating instructions.40 Annex A (informative)
Gas connections in common use in the various countries.41 Annex B (informative)
Leak-tightness test – volumetric method.42 Annex C (informative)
Leak-tightness test – pressure loss method.44 Annex D (normative)
Conversion of pressure loss into leakage rate.46 Annex E (normative)
Electrical/electronic component fault modes.47 Annex F (normative)
Additional requirements for safety accessories and pressure accessories as defined in EU Directive 97/23/EC.50 Annex G (normative)
Materials for pressurized parts.52 Annex H (informative)
Additional materials for pressurized parts.53 Annex I (normative)
Requirements for controls used in DC supplied gas burners and gas burning appliances.61 Annex ZA (informative)
Clauses of this European Standard addressing requirements or provisions of EU-Directives.65 Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EU Pressure Equipment Directive 97/23/EC.68 Bibliography.70
SIST EN 13611:2008
EN 13611:2007 (E) 3 Foreword This document (EN 13611:2007) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for gas-burners and gas-burning appliances”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. This document supersedes EN 13611:2000. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annexes ZA or B, which are an integral part of this document. For additional requirements for safety accessories and pressure accessories as defined in EU-Directive 97/23/EC see normative Annex F. For controls used in DC supplied gas burners and gas burning appliances see additional requirements in normative Annex I.
This European Standard covers type testing only. Tests intended for production testing are not specifically included. This standard recognizes the safety level specified by CEN/TC 58 and is regarded as a horizontal standard dealing with the safety, construction and performance of controls for gas burners and gas burning appliances and to their testing.
This European Standard should be used in conjunction with the specific standard for a specific type of control, (e. g. EN 88-1, EN 88-2, EN 125, EN 126, EN 161, EN 257, EN 298, EN 1106, EN 1643, EN 1854, EN 12067-1 and EN 12067-2, EN
12078) or for controls for specific applications. This standard may also be applied, so far as reasonable, to controls not mentioned in a specific standard and to controls designed on new principles, in which case additional requirements may be necessary. Other control standards should make use of this standard by adapting this standard and stating "addition“, "modification“ or "replacement“ in their corresponding clauses. This 2nd edition of EN 13611 includes EN 13611:2000/A1:2004 and new 6.5 Electric parts of the control and 6.6. Protection against internal faults for the purpose of functional safety. Annex G contains a list of materials which meet the essential requirements of Pressure Equipment Directive (PED). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 13611:2008
EN 13611:2007 (E) 4 1 Scope This European Standard specifies safety, construction, and performance requirements and testing of safety control or regulating devices and sub-assemblies or fittings (hereafter referred to as controls) for burners and gas burning appliances using fuel gases of the first, second or third families and to their testing. Controls to which this European Standard applies include the following: automatic shut-off valves; automatic burner control systems; flame supervision devices; gas/air ratio controls; pressure regulators; manual taps; mechanical thermostats; multifunctional controls; pressure sensing devices; valve proving systems; zero pressure regulators. The methods of test given in this standard are intended for product type testing.
For DC supplied controls Annex H applies. NOTE 1 When no particular control standard exists, the control can be tested according to this standard and further tests taking into account the intended use. NOTE 2 This European Standard should be used in conjunction with the specific control standard (see Bibliography). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 10028-2:2003, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties EN 10028-3:2003, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10028-4:2003, Flat products made of steels for pressure purposes — Part 4: Nickel alloy steels with specified low temperature properties SIST EN 13611:2008
EN 13611:2007 (E) 5 EN 10028-5:2003, Flat products made of steels for pressure purposes — Part 5: Weldable fine grain steels, thermomechanically rolled EN 10028-6:2003, Flat products made of steels for pressure purposes — Part 6: Weldable fine grain steels, quenched and tempered EN 10028-7:2007, Flat products made of steels for pressure purposes — Part 7: Stainless steels EN 10213-3:1995, Technical delivery conditions for steel castings for pressure purposes — Part 3: Steel grades for use at low temperatures EN 10222-1:1998, Steel forgings for pressure purposes — Part 1: General requirements for open die forgings EN 10222-5:1999, Steel forgings for pressure purposes — Part 5: Martensitic, austenitic and austenitic-ferritic stainless steels EN 10272:2000, Stainless steel bars for pressure purposes EN 13906-1, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 1: Compression springs EN 13906-2, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 2: Extension springs EN 60068-2-6, Environmental testing — Part 2: Tests — Tests Fc: Vibration
(sinusoidal) (IEC 60068-2-6:1995 + Corrigendum 1995) EN 60127-1, Miniature fuses — Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links (IEC 60127-1:2006) EN 60335-1:2002, Household and similar electrical appliances — Safety — Part 1: General requirements (IEC 60335-1:2001, modified)
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:1999, modified) EN 60947-5-1:2004, Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices (IEC 60947-5- 1:2003) EN 61000-4-2, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 2: Electrostatic discharge immunity test — Basic EMC publication (IEC 61000-4-2:1995) EN 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006) EN 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test (IEC 61000-4-4:2004) EN 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques — Surge immunity test (IEC 61000-4-5:2005) EN 61000-4-6, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:2003 + A1:2004 + A2:2006) SIST EN 13611:2008
EN 13611:2007 (E) 6 EN 61000-4-8, Electromagnetic compatibility (EMC); part 4: testing and measurement techniques; section 8: power frequency magnetic field immunity test; basic EMC publication (IEC 61000-4-8:1993) EN 61000-4-11, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement techniques — Voltage dips, short interruptions and voltage variations immunity tests (IEC 61000-4-11:2004) EN 61000-4-29, Electromagnetic Compatibility (EMC) — Part 4-29: Testing and measurement techniques; Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests (IEC 61000-4-29:2000) EN 61558-2-6, Safety of power transformers, power supply units and similar — Part 2-6: Particular requirements for safety isolating transformers for general use (IEC 61558-2- 6:1997) EN 61558-2-17, Safety of power transformers, power supply units and similar — Part 2-17: Particular requirements for transformers for switch mode power supplies (IEC 61558- 2-17:1997) EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1 ISO 262, ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts ISO 301, Zinc alloy ingots intended for casting ISO 7005,(all parts), Metallic flanges ISO 7637-2, Road vehicles — Electrical disturbances from conduction and coupling — Part 2: Electrical transient conduction along supply lines only ISO 7637-3, Road vehicles — Electrical disturbance by conduction and coupling - Part 3: Vehicles with nominal 12 V or 24 V supply voltage — Electrical transient transmission by capacitive and inductive coupling via lines other than supply lines IEC 61643-1, Low-voltage surge protective devices - Part 1: Surge protective devices connected to low-voltage power distribution systems - Requirements and tests
3 Terms and definitions` For the purposes of this document, the following terms and definitions apply. 3.1 control device which directly or indirectly controls the gas flow and/or provides a safety function within a gas burner or gas-burning appliance 3.2 control function function providing safe operation of gas burners and gas burning appliances 3.3 closure member movable part of the control which shuts off the gas flow SIST EN 13611:2008
EN 13611:2007 (E) 7 3.4 external leak-tightness leak-tightness of a gas-carrying compartment with respect to atmosphere 3.5 internal leak-tightness leak-tightness of the closure member (in the closed position) sealing a gas-carrying compartment with respect to another compartment or to the outlet of the control 3.6 inlet pressure pressure at the inlet of the control 3.7 outlet pressure pressure at the outlet of the control 3.8 pressure difference difference between the inlet and outlet pressures 3.9 maximum inlet pressure highest inlet pressure declared by the manufacturer at which the control may be operated 3.10 minimum inlet pressure lowest inlet pressure declared by the manufacturer at which the control may be operated 3.11 flow rate volume flowing through the control in unit time 3.12 rated flow rate air flow rate at a specified pressure difference declared by the manufacturer, corrected to standard conditions 3.13 maximum ambient temperature highest temperature of the surrounding air declared by the manufacturer at which the control may be operated 3.14 minimum ambient temperature lowest temperature of the surrounding air declared by the manufacturer at which the control may be operated 3.15 mounting position position declared by the manufacturer for mounting the control 3.16 nominal size DN numerical designation of size, for reference purposes, loosely related to manufacturing dimensions, common to all components in a piping system [ISO 6708:1995] SIST EN 13611:2008
EN 13611:2007 (E) 8 3.17 apparatus single piece of equipment with (a) direct function(s) intended for final use 3.18 system combination of apparatus and/or active components constituting a single functional unit and intended to be installed and operated to perform (a) specific task(s) 3.19 installation combination of apparatuses, components and systems assembled and/or erected (individually) in a given area NOTE
For physical reasons (e. g. long distances between individual items) it is in many cases not possible to test an installation as a unit. 3.20 fault tolerating time time between the occurrence of a fault and the shut down of the burner, which is tolerated by the application without creating a hazardous situation NOTE Actions other than shut down of a burner are possible if they can show prevention of hazardous situations. 3.21 fault reaction time time for a control function, within the fault tolerating time, to react on a fault and initiate a shut down
3.22 normal operation use of the control or its associated equipment for the purpose for which it was made and in the manner intended by the manufacturer under the conditions as specified 3.23 defined state state of a control with the following characterisation: a) control passively assumes a state in which the output terminals ensure a safe situation under all circumstances. When the cause of the transition to defined state is lifted the application starts up only in accordance with the appropriate requirements or b) control actively executes a protective action, within the time as specified for the specific control standard, causing it to shut down and/or lock-out or c) control remains in operation, continuing to satisfy all safety related functional requirements. 3.24 complex electronics denote assemblies which use electronic components with the following characteristics: a) Component provides more than one functional output. b) It is impractical or impossible to represent the failure mode of such a component by stuck-at and cross-links at the pins or by other failure modes which are described in Annex E. 3.25 reset
action which provides reset from lock-out to allow the system to attempt a restart SIST EN 13611:2008
EN 13611:2007 (E) 9 3.26 failure termination of the ability of an item to perform a required function [191-14-01 of IEC 60050-191:1990] 3.27 degradation undesired departure in the operational performance of any device, equipment or system from its intended performance
[161-11-19 of IEC 60050-161:1990] NOTE The term "degradation" can apply to temporary or permanent failure. 3.28 fault state of an item characterised by its inability to perform a required function, excluding the inability during preventive maintenance or other planned actions, or due to lack of external resources
NOTE 1 „Failure“ is an event, as distinguished from „fault“, which is a state. NOTE 2 After failure the item has a fault. NOTE 3 This concept as defined does not apply to items consisting of software only. NOTE 4 A fault is often the result of a failure of the item itself, but may exist without prior failure. [IEC 60191-1] 3.29 harm physical injury and/or damage to health or property
[ISO/IEC Guide 51:1999] 3.30 hazard potential source of harm
[ISO/IEC Guide 51:1999] 3.31 risk probable rate of occurrence of a hazard causing harm and the degree of severity of the harm
[ISO/IEC Guide 51:1999] 3.32 functional safety safety related to the application which depends on the correct functioning of the safety-related control 3.33 program sequence of control operations NOTE It may consist of switching on, starting up, supervising and switching off, safety shut down or lock out. SIST EN 13611:2008
EN 13611:2007 (E) 10 3.34 breather hole orifice which allows atmospheric pressure to be maintained within a compartment of variable volume 4 Classification 4.1 Classes of control Where appropriate, controls are classified by application (e. g. sealing force, performance characteristics, number of operations during their working life). For classification of controls, see also the specific control standard. 4.2 Groups of control Controls are grouped according to the bending stresses which they are required to withstand (see Table 4). Group 1 controls Controls for use in an appliance or installation where they are not subjected to bending stresses imposed by installation pipework (e. g. by the use of rigid adjacent supports). Group 2 controls Controls for use in any situation, either internal or external to the appliance, typically without support. NOTE Controls which meet the requirements of a group 2 control also meet the requirements of a group 1 control. 4.3 Classes of control functions For the evaluation of protective measures for fault tolerance and avoidance of hazards it is necessary to classify control functions with regard to their fault behaviour. At the classification of control functions their integration into the complete safety concept of the appliance shall be taken into account. For the purpose of evaluating the design of a control function, present requirements recognise three distinct classes: Class A: Control functions which are not intended to be relied upon for the safety of the application,
NOTE Examples are: room thermostats, temperature control. Class B: Control functions which are intended to prevent an unsafe state of the appliance. Failure of the control function will not lead directly to a hazardous situation, NOTE Examples are: thermal limiter, pressure limiter. Class C: Control functions which are intended to prevent special hazards such as explosion or whose failure could directly cause a hazard in the appliance. NOTE Examples are: burner control systems, thermal cut-outs for closed water systems (without vent protection). SIST EN 13611:2008
EN 13611:2007 (E) 11 5 Units of measurement and test conditions 5.1 Dimensions Dimensions are given in millimetres. 5.2 Pressures Pressures are static pressures relative to atmospheric pressure and are given in Pa or kPa (millibars or bars)1) . 5.3 Bending moments and torques Bending moments and torques are given in Newton metres. 5.4 Test conditions and measurement tolerances Tests are carried out with air at (20 ± 5) °C. All measured values are corrected to the standard conditions: 15 °C, 101,325 kPa (1013,25 mbar) dry. Controls which can be converted to another gas family by exchanging components are additionally tested with the conversion components. Tests are carried out in the mounting position declared by the manufacturer. Where there are several mounting positions, tests are carried out in the least favourable position. Where possible those tests already covered by other standards (e. g. EN 60730-series) shall be combined. Further test conditions are: rated voltage or rated voltage range; rated frequency; ambient temperature at (20 ± 5) °C. The error of measurement shall not exceed: for time measurements: ± 0,1 s; for temperature measurements: ± 1 K; for supply frequency measurements: ± 0,1 Hz; for electrical supply measurements: ± 0,5 %. All measurements shall be made after stable temperature conditions have been achieved.
1) 1 mbar = 100 N/m2 = 100 Pa SIST EN 13611:2008
EN 13611:2007 (E) 12 6 Construction requirements 6.1 General Controls shall be designed, manufactured, and assembled so that the various functions operate correctly when installed and used according to the manufacturer’s instructions. All pressurized parts of a control shall withstand the mechanical and thermal stresses to which it is subjected without any deformation affecting safety. In general conformity with the requirements given in this standard is verified by the methods of test given in this standard or the specific control standard. 6.2
Mechanical parts of the control
6.2.1 Appearance Controls shall be free from sharp edges and corners which could cause damage, injury or incorrect operation. All parts shall be clean internally and externally. 6.2.2 Holes Holes for screws, pins, etc., used for the assembly of parts of the control or for mounting, shall not penetrate gas ways. The wall thickness between these holes and gas ways shall be at least 1 mm. Holes necessary for manufacture which connect gas ways to atmosphere but which do not affect the operation of the control shall be permanently sealed by metallic means. Suitable jointing compounds may additionally be used. 6.2.3 Breather holes Breather holes in controls with diaphragms, which are not provided with a connection for a vent pipe, shall be designed in such a way that when the diaphragm is damaged, air does not escape at a rate of more than 70 dm³/h at the maximum inlet pressure. Conformity shall be verified by the method given in 6.2.4 For maximum inlet pressures below 3 kPa (30 mbar), this requirement is deemed to be met if the diameter of the breather hole does not exceed 0,7 mm. If a leakage rate limiter is used, it shall be able to withstand three times the maximum inlet pressure. If a safety diaphragm is used as a leakage rate limiter, it shall not take the place of the working diaphragm if there is a fault. Breather holes shall be protected against blockage or they shall be located such that they do not easily become blocked. They shall be positioned in such a way that the diaphragm cannot be damaged by a sharp device inserted through the breather hole. 6.2.4 Test for leakage of breather holes Rupture the dynamic part of the working diaphragm. Ensure all closure members of the control, if any, are in the open position. Pressurize all gas-carrying compartments to the maximum inlet pressure and measure the leakage rate. SIST EN 13611:2008
EN 13611:2007 (E) 13 6.2.5 Screwed fastenings Screwed fastenings which may be removed for service or adjustment shall have metric threads that conform to ISO 262 unless a different thread is essential for the correct operation or adjustment of the control. Self-tapping screws which cut a thread and produce swarf shall not be used for connecting gas-carrying parts or parts which may be removed for service. Self-tapping screws which form a thread and do not produce swarf may be used provided that they can be replaced by metric machine screws conforming to ISO 262. 6.2.6 Jointing Jointing compounds for permanent assemblies shall remain effective under normal operating conditions. Soldering or other processes where the jointing material has a melting point below 450 °C after application shall not be used for connecting gas-carrying parts except for additional sealing. 6.2.7 Moving parts The operation of moving parts (e. g. diaphragms, bellows) shall not be impaired by other parts. There shall be no exposed moving parts which could adversely affect the operation of controls. 6.2.8 Sealing caps Sealing caps shall be capable of being removed and replaced with commonly available tools and sealed (e. g. by lacquer). A sealing cap shall not hinder adjustment within the whole range declared by the manufacturer. 6.2.9 Dismantling and reassembly Parts which need to be dismantled for service or adjustment shall be capable of being dismantled and reassembled using commonly available tools. They shall be constructed or marked in such a way that incorrect assembly is impossible when following the manufacturer’s instructions. Closure parts, including those of measuring and test points, which may be dismantled for service or adjustment shall be constructed such that leak-tightness is achieved by mechanical means (e. g. metal-to-metal joints, O-rings) without using jointing compounds such as liquids, pastes or tapes. Closure parts not intended to be dismantled shall be sealed by means which will show evidence of interference (e. g. lacquer). 6.3 Materials 6.3.1 General material requirements The quality of materials, the dimensions used and the method of assembling the various parts shall be such that construction and performance characteristics are safe. Performance characteristics shall not alter significantly during a reasonable life when installed and used according to the manufacturer’s instructions. Under these circumstances, all components shall withstand any mechanical, chemical, and thermal conditions to wh
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