CEN/TR 15339-4:2014

SLOVENSKI STANDARD
01-marec-2015
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Thermal spraying - Safety requirements for thermal spraying equipment - Part 4: Gas
and liquid fuel supply
Thermisches Spritzen - Sicherheitsanforderungen für Einrichtungen für das thermische
Spritzen - Teil 4: Gas- und Flüssigbrennstoffversorgung
Ta slovenski standard je istoveten z: CEN/TR 15339-4:2014
ICS:
25.220.20 Površinska obdelava Surface treatment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 15339-4
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
December 2014
ICS 25.220.20
English Version
Thermal spraying - Safety requirements for thermal spraying
equipment - Part 4: Gas and liquid fuel supply
Projection thermique - Exigences de sécurité relatives au Thermisches Spritzen - Sicherheitsanforderungen für
matériel de projection thermique - Partie 4: Alimentation en Einrichtungen für das thermische Spritzen - Teil 4: Gas- und
gaz et en combustible liquide Flüssigbrennstoffversorgung

This Technical Report was approved by CEN on 16 September 2014. It has been drawn up by the Technical 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, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 15339-4:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Function of thermal spraying equipment .4
3.1 General .4
3.2 Gases for thermal spraying .5
3.3 Safety related features of gas, liquid fuel, and cooling water supply .6
4 Potential hazards .6
5 Safety requirements – Protection measures .7
5.1 General requirements and measures .7
5.2 Safety requirements and protection measures for gas storage .7
5.3 Safety requirements and protection measures for high pressure gas supply .7
5.4 Safety requirements and protection measures for liquid fuel supply .8
5.5 Safety requirements and protection measures for cooling media supply .8
5.6 Gas detection .8
5.7 Measures in the case of a gas leakage .9
5.8 Leak test – Pressure test .9
5.9 Finishing the installation - Inspections .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 . 10
6.4 Requirements for the gas supplier . 10
7 National rules . 10
Annex A (informative) Schematic representations of equipment for supply of gas and liquid fuel. 11
Bibliography . 14

Foreword
This document (CEN/TR 15339-4:2014) 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. 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 (published 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
1 Scope
This Technical Report specifies safety requirements of equipment for thermal spraying, in this case of gas
supply including supply of liquid fuels. It deals with safety requirements for storage and the high pressure
piping system from storage to the gas control unit or pressure regulator equipment. Safety requirements for
gas hoses, hose assembly and torches are presented in CEN/TR 15339-3.
This document should be used in conjunction with CEN/TR 15339-1, which deals with general aspects of
designing, manufacturing, and/or putting into service of machines or equipment and with the responsibility to
issue the CE Conformity Declaration.
2 Normative references
The following documents, in whole or in part, are normatively 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 15339-2, Thermal spraying — Safety requirements for thermal spraying equipment — Part 2: Gas control
units
EN ISO 3821, Gas welding equipment — Rubber hoses for welding, cutting and allied processes (ISO 3821)
CEN/TR 15339-1, Thermal spraying — Safety requirements for thermal spraying equipment — Part 1:
General requirements
CEN/TR 15339-3, Thermal spraying — Safety requirements for thermal spraying equipment — Part 3:
Torches for thermal spraying and their connections and supply units
CEN/TR 15339-6, Thermal spraying — Safety requirements for thermal spraying equipment — Part 6: Spray
booth, Handling system, Dust collection, Exhaust system, Filter
3 Function of thermal spraying equipment
3.1 General
Thermal spraying processes are described and schematically represented in EN 657.
Thermal spraying processes as flame, plasma or HVOF (high velocity oxygen fuel) spraying use inert,
flammable and oxidizing gases which possess a significant potential of danger. Oxygen is considered as a
dangerous gas because hardly inflammable material will burn in the presence of a certain concentration of
oxygen.
Pressurised air, nitrogen, or carbon dioxide (CO ) are applied for cooling the substrate’s surface or the part to
be sprayed. Fuel gases and oxygen are used for fusing of sprayed coatings made out of self fluxing alloys.
For such applications, an appropriate and safe supply shall be ensured by gases from manifold cylinder
banks, cryogenic gas tanks or public piping systems (natural gas).
The installation of the gas delivery system, taken in conjunction with control measures, such as gas detection
flow rates, and interlocking of the thermal spray equipment, forms a crucial part of the HAC. The respective
class shall be considered. For details, see CEN/TR 15339-1 and CEN/TR 15339-6.
3.2 Gases for thermal spraying
Table 1 — Gases for thermal spraying
Thermal spraying process Gases and mixtures used - Remarks
Flame spraying acetylene (C H )
2 2
a
propane (C H )
3 8
propylene (C H )
3 6
hydrogen (H )
oxygen (O )
air
c
carbon dioxide (CO )
High Velocity Oxygen Fuel spraying (HVOF) acetylene (C H )
2 2
ethene (C H )
2 4
a
propane (C H )
3 8
b
CNG (natural gas)
hydrogen (H )
oxygen (O )
nitrogen (N )
air
c
carbon dioxide (CO )
Cold spraying helium (He)
nitrogen (N )
and their mixtures
air
Detonation spraying acetylene (C H )
2 2
propylene (C H )
3 6
oxygen (O )
nitrogen (N )
air
c
carbon dioxide (CO )
Arc spraying argon (Ar)
nitrogen (N )
argon or nitrogen mixtures
air
c
carbon dioxide (CO )
Plasma spraying argon (Ar)
helium (He)
hydrogen (H )
nitrogen (N )
and their mixtures
air
c
carbon dioxide (CO )
Laser spraying, Laser cladding helium (He)
nitrogen (N )
argon (Ar)
Thermal spraying process Gases and mixtures used - Remarks
and their mixtures
air
c
carbon dioxide (CO )
a
Propane is applied as a liquid gas containing >=95 % C H and remnants or traces of butane (C H ),
3 8 4 10
ethane (C H ), ethene (C H ) or butane-isomers
2 6 2 4
b
CNG (natural gas) contains mainly methane (CH ), however its content varies between 80 and more than
95 %. Further constituents are inert gases, ethane, propane, butane, pentane (C H ). The PCI (BTU) can be
5 12
kept constantly adjusted by the N content.
c
CO can be applied beside of pressurized air or nitrogen for cooling the substrate or the coating itself.
3.3 Safety related features of gas, liquid fuel, and cooling water supply
— Storage of burnable and inflammable gases.
— Storage of liquid fuels.
— Supply of high pressure gases in the high pressure gas supply system (> 20 bar) running from the
storage to the spraying equipment, e.g. to the gas control cabinet (for details, see EN 15339-2) or to the
stop and control fitting of the torch hose (for details, see CEN/TR 15339-3).
— Supply of liquid fuel from the storage to the control cabinet (for details, see EN 15339-2).
— Supply of oxygen or air for acceleration the combustion of the spray jet.
— Storage, supply and distribution of cooling media for thermal spraying.
4 Potential hazards
For a safe operation and supply of gaseous and liquid fuels, the following hazards shall be considered for
normal operation or foreseeable abnormal circumstances.
— Risk of fire or explosion:
— if leakage occurs on the connections in the piping system;
— if the distance between gas cylinders or bundles of different gases is not appropriate;
— if leakages are produced when changing the connections.
— Risk of over-heating or damage by impairment of ice, snow, direct sunlight to the gas supply.
— Release of gases or liquids under high pressure.
— Impairment of the environment by gases and/or liquids.
— Risk of anoxia in the spray cabin by release of inert gases (e.g. Ar) or CO , if the ventilation is not
working, or if the operator enters the cabin before sufficient venting occurred (refer to 5.7)
— Risk and increase of fire by release of oxygen.
— Risk of flashback, if the stop valve or the gas pressure reducing fitting does not operate sufficiently.
5 Safety requirements – Protection measures
5.1 General requirements and measures
Specific safety conditions and protective measures are required by European, national or local regulations.
These requirements shall be fulfilled predominantly. The following equipment is covered by this Technical
Report.
Gas cylinders, manifold cylinder bundles and cryogenic gas tanks, storage receptacle for liquid fuel, piping
systems for gases, liquid fuel and cooling media.
Appropriate devices and equipment to fulfil the requirements are:
— gas stop valves;
— gas pressure regulator;
— shutt-off valve;
— gas pressure control;
— pressure reducing valves;
— pipes for the connection of the gas cylinders from the storage receptacle to the control cabinet, or within
the control cabinet;
— fittings, connecting parts;
— pressure gauges;
— flashback arresters;
— non-return valves.
5.2 Safety requirements and protection measures for gas storage
Wherever possible, stores for cryogenic liquid gas tanks, bulk supply of gases and/or tanks for liquid fuels
shall be located outside the work area, in purpose-built bays that can be locked.
The storage area shall be well ventilated, kept clean and the cylinders shall be protected against ice and snow
and direct sunlight. Access shall be given for the delivery and removal of bundl
...