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PREDSTANDARD
december 2005
Samodejni plinski ventilatorski gorilniki – Dopolnilo A2
Automatic forced draught burners for gaseous fuels – Amendment A2
ICS 27.060.20 Referenčna številka
SIST EN 676:2004/oprA2:2005(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD
DRAFT
EN 676:2003
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
September 2005
ICS
English Version
Automatic forced draught burners for gaseous fuels
Brûleurs automatiques à air soufflé pour combustibles Automatische Brenner mit Gebläse für gasförmige
gazeux Brennstoffe
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 131.
This draft amendment A2, if approved, will modify the European Standard EN 676:2003. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.
This draft amendment was established by CEN in three official versions (English, French, German). A version in any other language made
by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status
as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
: This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
Warning
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 676:2003/prA2:2005: E
worldwide for CEN national Members.
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EN 676:2003/prA2:2005 (E)
Contents Page
Foreword .3
ANNEX J (normative) Additional requirements for burners with pressurised parts and
burners with monitoring devices firing pressurised equipment as defined in
Pressure Equipment (PED) Directive 97/23/EC .4
J.1 Scope.4
J.3 Terms and definitions .4
J.5 test methods .9
J 5.9 Pressurised Parts.9
J.5.9.3 Component design welded joint test.10
J.6.3 Other marking .10
J 6.4 Instructions for installation, adjustment, maintenance and operation.10
Annex K (normative) Materials for pressurised parts .11
Annex ZC (informative) Relationship between this European Standard and the essential
safety requirements of the Pressure Equipment (PED) Directive 97/23/EC.21
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EN 676:2003/prA2:2005 (E)
Foreword
This document (EN 676:2003/prA2:2005) has been prepared by Technical Committee CEN/TC 131
“Gas burners using fans”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
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 EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZC, which is an integral part of this
document.
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EN 676:2003/prA2:2005 (E)
ANNEX J
(normative)
Additional requirements for burners with pressurised parts and
burners with monitoring devices firing pressurised equipment as
defined in Pressure Equipment (PED) Directive 97/23/EC
EN 676:2003 applies with the following supplements or modifications of the corresponding clauses.
J.1 Scope
according to clause 1 and addition:
For piping this amendment applies only for pressurised parts and accessories with a product of the
maximum allowable pressure PS and the diameter DN between 100 and 350 mm of less than 3 500
bar mm (category II) or with a product of PS and DN between 25 and 100 mm of less than 1 000 bar
mm (category I), as defined by EU directive 97/23/EC.
Additional electrical functional requirements are given for monitoring devices.
The risk philosophy adopted in this standard is based on the analysis of hazards on account of
pressure. The standard applies to the principals to eliminate or reduce hazards and where they can
not be eliminated appropriate protection measures shall apply.
Any residual hazards are identified and communicated to the user where appropriate.
Depending on the installation situation additional requirements may apply to cover the risks arising
from traffic, wind, earthquake loading and external fire.
J.3 Terms and definitions
J.3.2.3 Gas line components
according to clause 3.2.3 and addition:
J.3.2.3.5
pressurised parts
piping components and devices having pressure bearing housings with a pressure greater than 500
mbar
NOTE See EU Directive 97/23/EC
J 3.2.3.6
means for draining and venting
devices to allow harmless draining and venting of the pressurised fuel supply lines
J.3.2.4.18
monitoring devices
devices used for monitoring and controlling the burner when firing pressurised equipment
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EN 676:2003/prA2:2005 (E)
J 4.2.1 Design
according to clause 4.2.1 and addition:
The design of the burner shall be based on the intended life time declared by the manufacturer. The
intended life time of the equipment shall be taken into account.
The pressure equipment shall be properly designed taking all relevant factors into account in order to
ensure that the equipment will be safe throughout its intended life.
The design shall incorporate appropriate safety coefficients using comprehensive methods which are
known to incorporate adequate safety margins against all relevant failure modes in a consistent
manner.
NOTE The life time of the components may differ from the life time of the burner.
J 4.2.4 Materials
according to clause 4.2.4 and addition:
If the pressurised parts carry aggressive media, the materials used shall be resistant to this media.
J 4.2.7 pressurised parts
J 4.2.7.1 Design
Pressurised parts shall be designed for loadings appropriate to their intended use and other
reasonably foreseeable operating conditions.
Pressurised parts shall withstand a pressure strength test according to J.5.9.1.
J 4.2.7.2 Materials
Materials of pressurised parts, which are subject to a maximum allowable pressure > 0,5 bar, shall be
suitable for the intended lifetime unless replacement is foreseen. Such materials shall be verified
according to the following requirements:
Materials
shall comply with harmonised standards (see table K.1), or
shall be covered by a European approval of pressure equipment materials (e.g. EN 13840), or
shall be subject of a particular material appraisal.
Materials used in similar applications under similar operating conditions, which have been recognised
as being safe to use before 29 November 1999 may also be regarded as suitable. The safety of
pressurised parts using such materials shall be verified in combination with the design assessment
according to J.4.2.7.1.
The equipment manufacturer shall take appropriate measures to ensure that the material used
conforms with the required specification. In particular, documentation prepared by the material
manufacturer affirming compliance with a specification shall be obtained for all materials.
For the main pressure-bearing parts of equipment in category II, this shall take the form of a certificate
of specific product control.
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EN 676:2003/prA2:2005 (E)
NOTE 1 For a list of materials used for the construction of pressure equipment and recognised as being safe
to use before 29 November 1999, see table K.2 and K.3.
J.4.2.7.3 Permanent joints
Permanent joints and adjacent zones must be free of any surface or internal defects detrimental to the
safety of the equipment.
The properties of permanent joints must meet the minimum properties specified for the materials to be
joined unless other relevant property values are specifically taken into account in the design
calculations
For pressure equipment, permanent joining of components which contribute to the pressure resistance
of equipment and components which are directly attached to them must be carried out by suitably
qualified personnel according to suitable operating procedures
J.4.3.2 Electrical safety
all electrical equipment and connections of the burner shall comply with the requirements of EN
50156-1,unless otherwise specified in this annex.
J 4.3.4.1 General
according to clause 4.3.4.1 and addition
All gas line components shall be assembled and mounted without bending, torque and other
mechanical stress.
All gas line components used as pressurised parts shall comply with the PED or its mandated
standards gas line components at a pressure > 0,5 bar up to 4 bar shall be designed up to DN 50 with
threads of 2 inches or flanges. Larger dimensions shall be flanged
All gas line components shall be protected against possible flashback by appropriate means.
All gas line components in case of aggressive gases shall be made of materials for appropriate lifetime.
The manufacturer shall declare periods of service and maintenance and declare appropriate lifetime or
cycles to maintain safety.
J.4.3.4.4 gas pressure governor
The gas pressure governor shall comply with prEN 88-2 as pressure bearing part.
J.4.3.4.5 High gas pressure over load protection device
The high gas pressure over load protection device shall comply with EN 1854/ and fitted as monitoring
device for fired pressurized bodies and pressure bearing part.
J.4.3.4.6 Low gas pressure protection device
The low gas protection device, if used, shall comply with EN 1854 and fitted as monitoring device for
fired pressurized bodies and a pressure bearing part.
J 4.3.4.8 automatic safety shut-off valve
All burners shall be fitted with two automatic safety shut-off valves class A according to EN 161 as a
pressure bearing part in series according to 4.3.4.8 and addition to table 1:
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EN 676:2003/prA2:2005 (E)
If aggressive gases are used, the equipment in table 1 of > 1200 kW shall apply.
J.4.3.4.11 air proving device
The burner shall be fitted with a device for proving adequate air flow during the pre-purge, ignition and
operation of the burner. If a pressure sensing device is used it shall comply with EN 1854 as being a
monitoring device for fired pressurized bodies.
J.4.3.4.14 automatic burner control system
The automatic burner control system as being a monitoring device for fired pressurized bodies shall
comply with the requirements of EN 298 and > 1200 kW burner output it shall have a permanent
operation mode.
J 4.3.4.16 means for draining and venting
Gas lines shall be equipped with devices for harmless draining and venting under pressure. These
devices shall be located upstream the safety shut-off valves (see figure J.1).
Key
1 means for venting
2 mean for draining
Figure J.1 — Devices for draining and venting
J 4.4.1 General functions requirements
The following functions of the burner shall be designed according to EN 50156-1 as equivalence to
maintain safety integrity level 3 (SIL-class 3):
pressure control;
burner control and flame detection;
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EN 676:2003/prA2:2005 (E)
safe shut off of the gas supply;
air/fuel ratio control;
integration of the superior safety equipment of the boiler and of the firing system.
The requirements of the construction, see J.4.4.1.11.
The requirements of the safety life cycle, see J.4.4.1.12.
J 4.4.1.10 external safety limiter
The operation of an external safety limiter (e.g. safety accessories of the pressure vessel as water
level limiters, pressure sensing devices, etc.) as being a safety accessories shall cause at least a non
volatile lockout of the burner.
J.4.4.1.11 Design according to EN 50156-1
The equipment of the following paragraphs is considered to be an equivalence to the requirements of
SIL-Class 3 of the EN 50156-1.
Alternative equipment has to comply with EN 50156-1 and has to maintain SIL-Class 3, and to prove it.
NOTE 1 Fulfilling a specific SIL class implies fulfilling a fault assessment according EN 50156-1:2005, cl.10.5
NOTE 2 Other SIL-classes may be applicable, if this is based on a risk assessment according EN 50156-1.
J.4.4.1.11.1 Pressure control
The pressure control shall be designed according to J 4.3.4.5 and J 4.3.4.11.
J.4.4.1.11.2 Burner control and flame detection
The burner control and the flame detection shall be designed according to J.4.3.4.14 and EN 298.
J.4.4.1.11.3 Safe shut off of the gas supply
The safe shut off of the gas supply shall be designed according to J.4.3.4.8.
A valve proving system according to EN 1643 is required.
J.4.4.1.11.4 Air/fuel ratio control
Mechanical air-/gas ratio controls shall be operated by mechanical feed and shall be designed in such
a way that the ratio is not inadmissible influenced by interference and operation effects.
Pneumatic air-/gas ratio controls shall be designed according to EN 12067-1.
Electronic air-/gas ratio controls shall be designed according to EN 12067-2.
J.4.4.1.11.5 integration of the superior safety equipment of the boiler and of the firing system
The signal processing of superior safety equipment of the boiler shall be designed according to. EN
50156-1:2005, figure 10 or figure 11, see J.4.4.1.10.
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EN 676:2003/prA2:2005 (E)
J.4.4.1.12 Consideration: Safety Life Cycle
In figure J.2 the safety life cycle for the application and installation of a protective system of a burner
according to this standard is demonstrated.
Figure J.2 — Safety life cycle for the burner
J.5 test methods
according to clause 5 and addition :
J 5.9 Pressurised Parts
J 5.9.1 Component Design Pressure Strength Test
The pressure strength test shall be performed by using a safety factor f for the test pressure where f is
the multiplication factor for the maximum inlet pressure.
If not otherwise defined by harmonised design standards, a safety factor for the design f = 2.5 shall
be considered.
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EN 676:2003/prA2:2005 (E)
An external soundness test shall be carried out according 5.3.1
.
NOTE Experimental test factors dependent on the type of the device and on the material are given in
appropriate design standards for pressurised parts, e. g. see harmonised standard prEN 12516-3.
J 5.9.2 Component Design creep- and fatigue test
A deformation test is carried out by pressurising the part with f times (as specified in J.5.9.1) the
maximum inlet pressure for a minimum of 15 min.
The deformation of the part is measured by appropriate means after depressurising; no permanent
deformation shall occur.
An external soundness test shall be carried out according 5.3.1
.
J.5.9.3 Component design welded joint test
For welded joints of the pressurised parts the manufacturer shall prove that the production procedures
and their joint coefficient shall not exceed the following value:
for equipment subject to destructive and non-destructive tests which confirm that a representative
batch of joints show no significant defects: 1.
If necessary, the type of stress and the mechanical and technological properties of the joint shall also
be taken into account.
J.6.3 Other marking
The burner shall be identified as pressure equipment with its pressurised parts > 0,5 bar.
The burner and its monitoring devices shall be identified when they fire pressurised bodies according
to PED.
J 6.4 Instructions for installation, adjustment, maintenance and operation
according to clause 6.4 and addition :
The instruction shall include the following requirements:
All gas line components shall be assembled and mounted without bending, torque and other
mechanical or thermal stress.
The intended life time of the burner shall be declared by the manufacturer as well as the appropriate
activities to ensure further safe operation. The manufacturer shall further give information about the
wear parts and adequate changing/lifetime periods in which they have to be exchanged to incorporate
adequate safety margins.
The instruction shall include information about the application of firing aggressive gases.
The installation instruction shall indicate how to connect external safety limiters to the burner control
system and shall declare if the burner will go to a safety shut down only or a non-volatile lock-out.
Information to the user shall be given on residual hazards to take the appropriate special measures at
the time of installation and/or use. The instructions shall also include all relevant information on
mounting and maintenance. If appropriate, these instructions shall also refer to hazards arising from
misuse.
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EN 676:2003/prA2:2005 (E)
Annex K
(normative) Materials for pressurised parts
Table K.1 — List of materials covered by harmonised standards
Materials Restrictions
Group Type Relevant standard Regulator / safety device
b b
Operating temperature PS
max [PS x DN ] DN
max max
a
-20 °C to 60 °C bar bar x mm mm
-10 °C to 60 °C
Pressure containing parts and inner metallic partition walls
Rolled and forged steel S235JR / 1.0037 with thickness ≤ 40 mm, S275JR 10028 x 100 - -
/ 1.0044 with thickness ≥ 1,5 mm, S355JR/ 1.0045
with thickness ≥ 1,5 mm
S235J2G3 / 1.0116 & S235J2G4 / 1.0117 both with x
nominal thickness ≤ 150 mm, S275J2G3 / 1.0144
& S275J2G4 / 1.0145 & S355J2G3 / 1.0570 all with
1,5 mm < nominal thickness ≤150 mm
S275JO / 1.0143 & S355JO / 1.0553 both with 1,5
mm < nominal thickness ≤ 250 mm and at –20 °C
KV 27 J av. of three and 20 J min
c
P235GH / 1.0345, P265GH / 1.0425, P295GH/ 10028-2 x
1.0481, P355GH / 1.0473 all with thickness ≤ 150
mm
c
P275NH / 1.0487, P355NH / 1.0565 with thickness 10028-3 x
≤ 150 mm, P355NL1 / 1.0566 with thickness ≤ 150
mm
c
All types 10028-4 , 10028- x
c
5
c
All grades from P355. to P 500… with thickness ≤ 10028-6 x
150 mm
c
All steel designation with A ≥ 16 %
10028-7 x
min
c
All steel designations with A ≥ 16 % and at –
10222-1
min
20 °C KV 27 J av. of three and 20 J min
c
All steel designations martensitic type 10222-5 x
All steel designations austenitic type x
c
All steel designations with A ≥ 16 %, and at – 10272 x
min
20 °C KV 27 J av. of three and 20 J min
c
Cast Steel All steel designations EN 10213-3 x
11
EN
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EN 676:2003/prA2:2005 (E)
Table K.2 - List of materials not based on harmonised standards bur inherently meeting PED
Materials Restrictions
Group Type Relevant standard R
...