CEN TR 15339-3-2014 Thermal spraying - Safety requirements for thermal spraying equipment - Part 3 Torches for thermal spraying and their connection and supply units《热喷涂 热喷涂设备的安全要求.pdf

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1、BSI Standards PublicationPD CEN/TR 15339-3:2014Thermal spraying Safetyrequirements for thermalspraying equipmentPart 3: Torches for thermal spraying andtheir connection and supply unitsPD CEN/TR 15339-3:2014 PUBLISHED DOCUMENTNational forewordThis Published Document is the UK implementation of CEN/T

2、R15339-3:2014.The UK participation in its preparation was entrusted to TechnicalCommittee STI/40, Thermal spraying and thermally sprayed coatings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the nece

3、ssaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 78897 0ICS 25.220.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document wa

4、s published under the authority of theStandards Policy and Strategy Committee on 31 December 2014.Amendments issued since publicationDate Text affectedPD CEN/TR 15339-3:2014TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 15339-3 December 2014 ICS 25.220.20 English Version Thermal spray

5、ing - Safety requirements for thermal spraying equipment - Part 3: Torches for thermal spraying and their connection and supply units Projection thermique - Exigences de scurit relatives au matriel de projection thermique - Partie 3: Chalumeaux de projection thermique et leurs units de raccordement

6、et dalimentation Thermisches Spritzen - Sicherheitsanforderungen fr Einrichtungen fr das thermische Spritzen - Teil 3: Brenner und Spritzpistolen und ihre Anschlsse und Stromquellen This Technical Report was approved by CEN on 16 September 2014. It has been drawn up by the Technical Committee CEN/TC

7、 240. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

8、Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitat

9、ion in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TR 15339-3:2014 EPD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Function of thermal spraying equipment 4 3.1 General 4 3.2 Safety related features

10、 of the spray torches and their connections 5 3.2.1 Spray torches for flame and HVOF spraying 5 3.2.2 Spray torches for cold spraying .5 3.2.3 Spray torches for arc spraying .5 3.2.4 Spray torches for plasma spraying5 3.3 Safety related features of the ignition unit 6 3.4 Safety related features of

11、the power source .6 4 Potential hazards .6 4.1 General 6 4.2 Flame and HVOF spraying 6 4.3 Cold spraying .7 4.4 Arc spraying .7 4.5 Plasma spraying 7 5 Safety requirements Protection measures 7 5.1 General safety requirements and measures .7 5.2 Safety requirements and protection measures for flame

12、and HVOF spraying .8 5.3 Safety requirements and protection measures for cold spraying 8 5.4 Safety requirements and protection measures for arc and plasma spraying .8 5.5 Safety requirements related to electrical and water connections to and in the junction and monitoring box .9 5.6 Safety requirem

13、ents for power sources 9 6 Requirements for manufacture, supply, operation, and maintenance.9 6.1 Requirements for the manufacturer.9 6.2 Requirements for the integrator .9 6.3 Requirements for the user 9 7 National rules .9 Bibliography . 10 PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 3 Foreword

14、This document (CEN/TR 15339-3:2014) has been prepared by Technical Committee CEN/TC 240 “Thermal spraying and thermally sprayed coatings”, the secretariat of which is held by DIN. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CE

15、N and/or CENELEC shall not be held responsible for identifying any or all such patent rights. CEN/TR 15339, Thermal spraying - Safety requirements for thermal spraying equipment is composed of the following parts: Part 1: General requirements Part 2: Gas control units (published as a European Standa

16、rd) Part 3: Torches for thermal spraying and their connection and supply units Part 4: Gas and liquid fuel supply Part 5: Powder and wire feed units Part 6: Spray booth, Handling system, Dust collection, Exhaust system, Filter PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 4 1 Scope This Technical Re

17、port specifies safety requirements of equipment for thermal spraying, in this case of spray torches, gas hoses, hose assemblies and their electrical and water junctions in junction and monitoring boxes and power sources. Equipment and storage for gas and liquid fuel supply are presented in CEN/TR 15

18、339-4. This document should be used in conjunction with CEN/TR 15339-1, which deals with general aspects of designing, manufacture, and/or putting into service of machines or equipment and with the responsibility to issue the CE Conformity Declaration. Spraying equipment for specific thermal sprayin

19、g processes, induction plasma spraying, water stabilized plasma spraying and plasma spraying in chambers (below or above atmospheric pressure) are not within the scope of this Technical Report. 2 Normative references The following documents, in whole or in part, are normatively referenced in this do

20、cument and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 657, Thermal spraying Terminology, classification EN 1256, Gas welding equipment Specif

21、ication for hose assemblies for equipment for welding, cutting and allied processes CEN/TR 15339-1, Thermal spraying Safety requirements for thermal spraying equipment Part 1: General requirements CEN/TR 15339-6, Thermal spraying Safety requirements for thermal spraying equipment Part 6: Spray booth

22、, Handling system, Dust collection, Exhaust system, Filter EN 60974-1, Arc welding equipment Part 1: Welding power sources (IEC 60974-1) EN 60974-3, Arc welding equipment Part 3: Arc striking and stabilizing devices (IEC 60974-3) EN 60974-7, Arc welding equipment Part 7: Torches (IEC 60974-7) EN 609

23、74-10, Arc welding equipment Part 10: Electromagnetic compatibility (EMC) requirements (IEC 60974-10) EN ISO 3821, Gas welding equipment Rubber hoses for welding, cutting and allied processes (ISO 3821) 3 Function of thermal spraying equipment 3.1 General Thermal spray processes and spray torches ar

24、e described and schematically represented in EN 657. Thermal spray processes use flammable gases for flame-, plasma- or HVOF (high velocity oxygen fuel) spraying, which create significant potential hazards. Pure oxygen shall also be considered a dangerous gas, because relatively non-flammable materi

25、al will burn in the presence of a certain concentration of oxygen. Electrical devices are common sources for igniting an explosive atmosphere. Only spraying equipment which is suitable for the rated zone shall be operated. PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 5 NOTE See Directive 94/9/EC 1.

26、 Operation of thermal spraying equipment in the rated zone 0 shall be avoided in any case. 3.2 Safety related features of the spray torches and their connections 3.2.1 Spray torches for flame and HVOF spraying The following items shall be considered: supply of fuel gas or liquid fuel; supply of oxyg

27、en and/or air for combustion, acceleration or part cooling; combustion of fuel gas or liquid fuel with oxygen or air; powder injection or wire supply; molten spray particles in the spray jet; transport and distribution of cooling media. 3.2.2 Spray torches for cold spraying The following items shall

28、 be considered: supply of hot process gas; powder injection; heating and acceleration of the spray particles in the spray jet. 3.2.3 Spray torches for arc spraying The following items shall be considered: power supply; wire supply; supply of process gas for acceleration the spray jet. 3.2.4 Spray to

29、rches for plasma spraying The following items shall be considered: power supply via water or air cooled cables to the torch; supply of plasma gas or other gases; igniting the arc and the plasma; powder supply and injection; spray particles in the spray jet; transport and distribution of cooling medi

30、a. PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 6 3.3 Safety related features of the ignition unit The following items shall be considered: energy transfer from power source to the torch via a water cooled cable; transport and distribution of cooling media to the torch and back to the heat exchange

31、r. 3.4 Safety related features of the power source The following items shall be considered: electrical connection between mains power supply and the power source; electrical connection between the power source and the ignition unit or the spray system; fusing; cooling. 4 Potential hazards 4.1 Genera

32、l For a safe operation of the entire spray system, the following hazards shall be considered for normal operation or foreseeable abnormal circumstances. 4.2 Flame and HVOF spraying The following items shall be considered: flashback; fire risk due to leaks in the torch or the connections; explosive g

33、as mixtures in the torch and the environment, if the fuel gas did not ignite; escape of gas or liquid under excessive pressure; impairment of the environment due to the escape of gases like acetylene, propane, carbon dioxide (CO2) and/or liquids like cooling media, hot water, liquid fuel; increased

34、fire risk due to escape of oxygen; back flow of gas into the powder supply hose and the powder feed unit; insufficient distance to gas cylinders or bundles; electrostatic charging in the powder supply hose; excessive torch surface temperature. PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 7 4.3 Cold

35、 spraying The following items shall be considered: escape of gas under excessive pressure; escape of hot process gas under excessive pressure; escape of powder under excessive pressure; electrical connections and the heating system; excessive torch surface temperature; impairment of the environment

36、due to escape of gases and/or liquids, e.g. cooling water. 4.4 Arc spraying The following items shall be considered: damages of the insulation on cables; electrical connections; excessive torch surface temperature. 4.5 Plasma spraying The following items shall be considered: high voltage and/or high

37、 frequency during the ignition; excessive fluctuations for current and voltage; escape of gas or cooling water under excessive pressure; damages to the insulation on cables; excessive torch surface temperature; electrostatic charging in the powder supply hose; impairment of the environment due to es

38、cape of gases and/or liquids, e.g. cooling water. 5 Safety requirements Protection measures 5.1 General safety requirements and measures According to the type of spraying torch and whether it is operated in a manual, mechanised or automatic manner, spraying process specific safety requirements are t

39、o be considered and protection measures are to be carried out both for normal circumstances and foreseeable abnormal circumstances. It shall be possible to start and stop the operation of the spraying process (spray torch and powder feeder) from the control unit for mechanised or automatic processes

40、 and at the torch or by a remote control for manual operation. The remote control should contain an emergency stop function. PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 8 All electrically operated spray torches shall follow the requirements of EN 60974-10 (EMC); arc spraying torches shall also fol

41、low the requirements of EN 60974-7. The gas hoses shall be marked according to EN ISO 3821. Connections shall be in accordance with EN 1256 (not be made by twisted wire or of screwdriver adjustable hose bands). Measures shall be implemented to prevent release of gases without the extraction system b

42、eing operated. For details of thermal spraying in a spray cabin, see CEN/TR 15339-6. 5.2 Safety requirements and protection measures for flame and HVOF spraying Considering the safety requirements, the spray torch and hose assembly shall be operated or equipped with gas or liquid fuel stop valves at

43、 the torch for manual operation, flashback arresters as close as possible to the torch. In the case of automatic systems, shut off valves for all fluids shall be contained in the control system. To avoid flashbacks into the powder hose, a continuous and sufficient carrier gas flow shall be ensured i

44、n the torch; only inert carrier gases (usually Ar, N2) should be applied. In systems using liquid fuel, as for example kerosene, suitable hoses and fittings shall be used. 5.3 Safety requirements and protection measures for cold spraying Considering the safety requirements, the spray torch and hose

45、assembly shall be operated or equipped with stop valves in the gas supply to the torch; interruption of the heating power; sufficient thermal guarding of the gas piping to the spray torch; sufficient electrical and thermal guarding of the spray torch when manually operated. 5.4 Safety requirements a

46、nd protection measures for arc and plasma spraying Considering the safety requirements, the spray torch and hose assembly shall be operated or equipped with a means of immediately shutting-off the current (plasma and arc spraying); a means of immediately stopping the wire feed (arc spraying); an air

47、 stop valve for arc spraying; gas and cooling water stop valves; protection from unintentional touch of live parts of the spray torch; sufficient insulation of the cables. PD CEN/TR 15339-3:2014CEN/TR 15339-3:2014 (E) 9 5.5 Safety requirements related to electrical and water connections to and in th

48、e junction and monitoring box Considering the safety requirements, the current to water connections shall be operated or equipped with protection from unintentional touch and accidental short circuit of cables and live parts of the junction and monitoring box; appropriate fittings for the entrance a

49、nd the escape of the cooling water. 5.6 Safety requirements for power sources Power sources for arc or plasma spraying shall meet the requirements of EN 60974-1, EN 60974-3 and EN 60974-10 (EMC). The national rules for the maximum admissible no-load voltage for normal service condition and for excessive endangering shall be considered. 6 Requirements for manufacture, supply, operation, and maintenance 6.1 Requ