BS PD CEN TR 15339-3-2014 Thermal spraying Safety requirements for thermal spraying equipment Torches for thermal spraying and their connection and supply units《热喷涂 热喷涂设备的.pdf

1、BSI Standards Publication PD CEN/TR 15339-3:2014 Thermal spraying Safety requirements for thermal spraying equipment Part 3: Torches for thermal spraying and their connection and supply unitsPD CEN/TR 15339-3:2014 PUBLISHED DOCUMENT National foreword This Published Document is the UK implementation

2、of CEN/TR 15339-3:2014. The UK participation in its preparation was entrusted to Technical Committee STI/40, Thermal spraying and thermally sprayed coatings. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to includ

3、e all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 78897 0 ICS 25.220.20 Compliance with a British Standard cannot confer immunity from legal obligations. This

4、 Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 December 2014. Amendments issued since publication Date Text affectedPD CEN/TR 15339-3:2014TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 15339-3 December 2014 ICS 25.220.20 Engl

5、ish Version Thermal spraying - 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 leu

6、rs units de raccordement 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 T

7、echnical Committee CEN/TC 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, Mal

8、ta, Netherlands, Norway, 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 CE

9、N All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TR 15339-3:2014 EPD CEN/TR 15339-3:2014 CEN/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

10、.2 Safety related features 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 S

11、afety related features of 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 prot

12、ection measures for flame 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

13、box .9 5.6 Safety requirements 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 15339-3:2014 CEN/TR 1

14、5339-3:2014 (E) 3 Foreword 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 s

15、ubject of patent rights. CEN 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 (pub

16、lished as a European Standard) 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 15339-3:2014 CEN/TR 15339-3:2014 (E)

17、 4 1 Scope This Technical Report 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 suppl

18、y are presented in CEN/TR 15339-4. 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

19、for specific thermal spraying 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 norma

20、tively referenced in this document 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,

21、Gas welding equipment Specification 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 e

22、quipment Part 6: Spray booth, 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:

23、Torches (IEC 60974-7) EN 60974-10, 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 pr

24、ocesses and spray torches are 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 rel

25、atively non-flammable material 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 15339-3:2014 CEN/TR 15339-3:2014 (E) 5

26、NOTE See Directive 94/9/EC 1. 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 o

27、r liquid fuel; supply of oxygen 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 spray

28、ing The following items shall 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

29、the spray jet. 3.2.4 Spray torches 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

30、 distribution of cooling media. PD CEN/TR 15339-3:2014 CEN/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

31、 and back to the heat exchanger. 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.

32、4 Potential hazards 4.1 General 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 o

33、r the connections; explosive gas 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 (CO 2 ) and/or liquids like cooling media, ho

34、t water, liquid fuel; increased 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 15339-3:2014 C

35、EN/TR 15339-3:2014 (E) 7 4.3 Cold 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 temperatur

36、e; impairment of the environment 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 con

37、sidered: high voltage and/or high 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; impair

38、ment of the environment due to escape 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 s

39、pecific safety requirements are to 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

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

41、rc spraying torches shall also follow 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 gas

42、es without the extraction system being 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

43、 gas or liquid fuel stop valves at 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 c

44、arrier gas flow shall be ensured in the torch; only inert carrier gases (usually Ar, N 2 ) 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 req

45、uirements, the spray torch and hose 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

46、 operated. 5.4 Safety requirements and 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

47、the wire feed (arc spraying); an air 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 15339-3:2014 CEN/TR 15339-3:2014 (E) 9 5.5 Safety requirements related to electric

48、al and water connections to and in the 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; ap

49、propriate fittings for the entrance and 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, suppl