oSIST prEN 12815:2011

SLOVENSKI STANDARD
01-maj-2011
Štedilniki na trdna goriva - Zahteve in preskusne metode
Residential cookers fired by solid fuel - Requirements and test methods
Herde für feste Brennstoffe - Anforderungen und Prüfung
Cuisiniéres domestiques à combustible solide - Exigences et méthodes d'essai
Ta slovenski standard je istoveten z: prEN 12815
ICS:
97.040.20 âWHGLOQLNLGHORYQLSXOWL Cooking ranges, working
SHþLFHLQSRGREQLDSDUDWL tables, ovens and similar
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 97.040.20 Will supersede EN 12815:2001
English Version
Residential cookers fired by solid fuel - Requirements and test
methods
Cuisiniéres domestiques à combustible solide - Exigences Herde für feste Brennstoffe - Anforderungen und Prüfung
et méthodes d'essai
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 295.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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.

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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12815:2011: E
worldwide for CEN national Members.

Contents Page
Foreword . 5
1 Scope. 6
2 Normative references . 6
3 Terms and definitions . 7
4 Materials, design and construction . 13
4.1 Production documentation . 13
4.2 General construction . 13
4.2.1 Design, manufacture and assembly . 13
4.2.2 Durability . 14
4.3 Boilers constructed of steel . 14
4.3.1 Parts subject to water pressure . 14
4.3.2 Nominal minimum wall thicknesses . 16
4.4 Boilers constructed of cast iron . 16
4.5 Boiler shell tappings . 17
4.6 Draining of boiler shell . 18
4.7 Boiler waterways . 18
4.7.1 Venting of the water sections . 18
4.7.2 Boilers used with direct water systems . 18
4.7.3 Boilers used with indirect water systems . 18
4.7.4 Water tightness . 18
4.8 Ashpan and ash removal. 19
4.9 Firedoors and charging doors . 19
4.10 Oven door . 19
4.11 Flue spigot or socket . 19
4.12 Internal flue gas diverter . 20
4.13 Control of flue gas . 20
4.14 Combustion air supply . 20
4.14.1 Primary air inlet control . 20
4.14.2 Secondary air inlet control . 20
4.15 Flueways . 20
4.16 Front firebars and/or deepening plate . 21
4.17 Hotplate and top plate . 21
4.18 Main/additional ovens. 21
4.19 Bottomgrate . 21
4.20 Ashpit and ashpit cover/door . 21
4.21 Provision for cleaning the boiler heating surfaces and flue connector . 22
4.22 Oven temperature indicators . 22
5 Safety requirements . 22
5.1 Temperature in integral fuel storage container . 22
5.2 Temperature of adjacent combustible materials . 22
5.3 Operating tools . 22
5.4 Natural draught safety test . 23
5.5 Strength and leaktightness of boiler shells . 23
5.6 Thermal discharge control . 23
5.7 Electrical safety . 23
6 Performance requirements . 23
6.1 Flue draught . 23
6.2 Flue gas temperature . 24
6.3 Emissions . 24
6.3.1 Carbon monoxide emission . 24
6.3.2 Hydrocarbon and NO emissions . 25
x
6.3.3 Particulate emissions . 25
6.4 Efficiency at nominal heat output . 25
6.5 Refuelling interval at nominal heat output . 25
6.6 Nominal heat outputs . 25
6.7 Oven heating . 26
6.8 Slow combustion and recovery . 26
6.9 Boiling test . 26
6.10 Appliances with alternative bottomgrate positions . 26
7 Appliance instructions . 27
7.1 General . 27
7.2 Installation instructions. 27
7.3 User operating instructions . 28
8 Evaluation of conformity . 29
8.1 General . 29
8.2 Initial type testing . 30
8.2.1 General . 30
8.2.2 Initial type testing for appliance changes . 31
8.3 Factory production control (FPC) . 33
8.3.1 General . 33
8.3.2 Raw materials and components . 33
8.3.3 Control of inspection, measuring and test equipment . 33
8.3.4 Process control . 33
8.3.5 Product inspection, testing and evaluation . 34
8.3.6 Non conforming products . 35
8.3.7 Corrective and preventive action . 35
8.3.8 Handling, storage, packaging, preservation and delivery . 35
9 Marking . 35
Annex A (normative) Test methods . 37
A.1 Test environment . 37
A.1.1 Ambient room temperature . 37
A.1.2 Cross-draught . 37
A.1.3 External sources . 37
A.2 Test assembly . 37
A.2.1 General . 37
A.2.2 Trihedron . 38
A.2.3 Measurement section . 38
A.2.4 Connection of the appliance to the measurement section . 39
A.2.5 Water circuit for appliances with boilers . 40
A.3 Measurement equipment . 40
A.4 Test procedures . 41
A.4.1 Appliance installation . 41
A.4.2 Calculation of fuel load. 41
A.4.3 Fuelling and de-ashing the fire . 41
A.4.4 Flue gas losses . 42
A.4.5 Water heating output . 42
A.4.6 Combustible heat losses in the residue . 42
A.4.7 Measurement of oven temperature . 43
A.4.8 Performance test regime . 43
A.4.9 Performance test at nominal heat output . 46
A.4.10 Hotplate boiling test . 48
A.4.11 Oven heating test . 49
A.4.12 Slow combustion and recovery test . 50
A.4.13 Oven shelf test . 52
A.4.14 Oven door test . 52
A.4.15 Natural draught safety test . 52
A.4.16 Temperature safety test. 54
A.4.17 Type pressure test for boilers . 56
A.4.18 Test for operation of thermal discharge control . 56
A.5 Test results . 58
A.6 Calculation methods . 59
A.6.1 Notations and units used . 59
A.6.2 Formulae . 61
A.7 Test report . 64
Annex B (normative) Test fuels and recommended fuels . 80
B.1 General . 80
B.2 Test fuel . 80
B.2.1 Selection of test fuel . 80
B.2.2 Storage, preparation and analysis . 80
B.3 Tests for recommended fuels . 81
B.3.1 Basis of testing . 81
B.3.2 Test methods and criteria . 81
Annex C (normative) Browning chart for oven heating test . 85
Annex ZA (informative) . 86
Clauses of this European Standard addressing the provisions of the EU Construction
Products Directive . 86
ZA.1 Scope and relevant characteristics . 86
ZA.2 Procedure for the attestation of conformity of residential cookers fired by solid
fuels . 89
ZA.3 CE Marking and labelling . 91
Bibliography . 98

Foreword
This document (prEN 12815:2011) has been prepared by Technical Committee CEN/TC 295
“Residential solid fuel burning appliances”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12815:2001.
This document has been prepared under the mandate M/129 given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
This document is a revision of the published standard EN 12815:2001 following comments received at
its 5 year review.
1 Scope
This European Standard is applicable to hand fired residential cookers whose primary function is to
cook and whose secondary function is to provide heat into the space in which they are installed.
Additionally, where fitted with a boiler, they also provide domestic hot water and/or central heating.
This European Standard specifies requirements relating to the design, manufacture, construction,
safety and performance (efficiency and emission) of residential cookers fired by solid fuel (hereafter
referred to as “appliance(s)”) and provides instructions for them. Furthermore, it also gives provisions
for evaluation of conformity (i.e. initial type testing (ITT) and factory production control (FPC) and
marking of these products.
These appliances may burn either solid mineral fuels, lignite briquettes, peat briquettes, natural or
manufactured wood logs or be multi-fuel in accordance with the appliance manufacturer's instructions.
This standard is not applicable to hopper fed or mechanically fired appliances or those appliances
having fan assisted combustion air.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication applies (including amendments).
EN 1561:1997, Founding — Grey cast irons
EN 1563:1997, Founding — Spheroidal graphite cast iron
EN 10025:1993, Hot rolled products of non-alloy structural steels — Technical delivery conditions
EN 10027-2:1992, Designation systems for steels — Part 2: Numerical system
EN 10028-2:1992, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy
steels with specified elevated temperature properties
EN 10029:1991, Hot rolled steel plates 3 mm thick or above — Tolerances on dimensions, shape and
mass
EN 10088-2:1995, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip for
general purposes
EN 10111:1998, Continuously hot-rolled low carbon steel sheet and strip for cold forming —Technical
delivery conditions
EN 10120:1996, Steel sheet and strip for welded gas cylinders
EN 60335-2-102, Household and similar electrical appliances — Safety — Particular requirements for
gas, oil and solid-fuel burning appliances having electrical connections
ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads —
Part 1: Dimensions, tolerances and designation
ISO 7-2: 2000, Pipe threads where pressure-tight joints are made on the threads —
Part 2: Verification by means of limit gauges
ISO 228-1:2000, Pipe threads where pressure-tight joints are not made on the threads —
Part 1: Designation, dimensions and tolerances
ISO 228-2:1987, Pipe threads where pressure-tight joints are not made on the threads —
Part 2: Verification by means of limit gauges
ISO 331:1983, Coal — Determination of moisture in the analysis sample — Direct gravimetric method
ISO 334:1992, Solid mineral fuels — Determination of total sulfur - Eschka method
ISO 351:1996, Solid mineral fuels — Determination of total sulfur — High temperature combustion
method
ISO 501:1981, Coal — Determination of the crucible swelling number
ISO 562:1998, Hard coal and coke — Determination of volatile matter
ISO 609:1996, Solid mineral fuels — Determination of carbon and hydrogen -High temperature
combustion method
ISO 687:1974, Coke — Determination of moisture in the analysis sample
ISO 1171:1997, Solid mineral fuels — Determination of ash content
ISO 1928:1995, Solid mineral fuels - Determination of gross calorific value by the bomb calorimetric
method, and calculation of net calorific value
ISO 2859 (all parts), Sampling procedures for inspection by attributes
CEN/TS 15883:2009, Residential solid fuel burning appliances — Emission test methods
3 Terms and definitions
For the purposes of this European Standard the following terms and definitions apply.
3.1
air inlet control
manual or automatic device to control the quantity of air supplied for combustion
3.2
ashpan
removable receptacle shaped to receive the residue falling from the firebed
3.3
ashpit
enclosed chamber designed to receive the residue or the ashpan
3.4
basic firebed
quantity of glowing embers which ensures ignition of the test fuel to be charged
NOTE The basic firebed may be specified by the manufacturer.
3.5
boiler
vessel in which water is heated, intended for fitting in or forming an integral part of a solid fuel
appliance
3.6
boiler waterways
space within a boiler which contains water
3.7
bottomgrate
part of the appliance at the base of the firebox which supports the firebed through which the residue
falls into the ashpan or ashpit and through which combustion air and/or combustion gases may be
drawn
3.8
burning rate
reduction in the mass of fuel per unit of time
3.9
charging door
door which covers the refuelling opening
3.10
combustion air
air supplied to the fire-box, which is entirely or partially used to burn the fuel
3.11
combustion air selector
device for adjusting the primary and/or secondary air according to the type of fuel burnt
3.12
combustion control device
mechanism for setting the primary and/or secondary air in accordance with the burning rate required
3.13
combustion gases
compounds in gaseous form produced inside an appliance when fuel is burned
3.14
damper
mechanism to change the resistance to flow of the combustion gases
3.15
continuous burning appliance
heating appliance designed for slow burning over an extended period of time (e.g. overnight) and
meeting the requirements of the slow combustion test
3.16
de-ashing
process of clearing a fuelbed and discharging the residue into the collecting receptacle
3.17
de-ashing mechanism
device to agitate or disturb the ash to facilitate its removal from the firebed
NOTE It may also be used to change the bottomgrate operating position on some appliances.
3.18
direct water system
hot water system in which stored domestic hot water is heated directly by hot water circulating from
the boiler
3.19
draught regulator
inlet device for admission of air downstream of the firebed, enabling the flue draught to be controlled
3.20
dry cooker
appliance which primarily provides the facility to cook by means of a hotplate and/or oven
NOTE It also provides heat to the room in which it is installed.
3.21
efficiency
ratio of total heat output to total heat input during the test period expressed as a percentage
3.22
firebed; fuelbed
fuel contained in the firebox
3.23
firebox; combustion chamber
that part of the appliance in which fuel is burned
3.24
firebox opening
aperture in the firebox through which an appliance may be fuelled
3.25
firedoor
door through which the fire may be viewed and which may be opened to allow refuelling of the firebed
3.26
flue draught
differential between the static air pressure in the place of installation and the static pressure at the flue
gas measurement point
3.27
flue gases
gaseous compounds leaving the appliance flue spigot and entering the flue gas connector
3.28
flue gas adaptor
fitting which allows for variations in size and shape of the flue components
3.29
flue gas connector
duct through which flue gases are conveyed from the flue spigot of the appliance into the chimney flue
3.30
flue gas mass flow
mass of flue gas drawn off from the appliance per unit of time
3.31
flue gas temperature
temperature of the flue gas at the specified point in the measurement section
3.32
flue spigot; flue socket
integral part of the appliance for connecting the flue gas connector thus permitting the deliberate
escape of products of combustion into the chimney flue
3.33
flueway
that part of the appliance designed to convey combustion gases from the firebox to the flue spigot
3.34
front firebars; deepening plate
grating or plate fitted at the front of the firebox opening to prevent spillage of fuel and ash or to
change the firebox capacity, or both
3.35
fuel regulator
device for controlling the size of the firebed
3.36
heat input
quantity of energy which the fuel provides to the appliance
3.37
heat output
quantity of useful heat released by the appliance
3.38
indirect water system
hot water system in which stored domestic hot water is heated by a primary heater through which hot
water from the boiler is circulated without mixing of the primary (heating) water and the stored
domestic hot water
3.39
integral fuel storage container
enclosed area forming part of the appliance, but not connected directly to the fuel charging area, in
which fuel is stored prior to it being physically transferred by the user to the fuel charging position
3.40
intermittent burning appliance
heating appliance designed for unrestricted burning at nominal heat output and which is not intended
for operating at reduced combustion for any specified period of time unless this is clearly stated by the
manufacturer
NOTE An appliance may be either a continuous burning appliance or an intermittent burning appliance
according to the fuel used.
3.41
maximum water operating pressure
limiting water pressure up to which the boiler of an appliance can be safely operated
3.42
nominal heat output
total heat output of the appliance quoted by the manufacturer and achieved under defined test
conditions when burning the specified test fuel
3.43
operating tool
device supplied with the appliance for handling movable, adjustable and/or hot components
3.44
oven shelf
a grid or plate for supporting cooking vessel(s) within the oven
3.45
primary air
combustion air which passes through the fuel bed
NOTE Primary air does not necessarily have separate inlets neither does it necessarily pass through a
bottomgrate.
3.46
recovery capability
ability of the fire to re-ignite existing or newly charged fuel after a defined burning period without
external assistance
3.47
recommended fuel
fuel of commercial quality listed in the appliance manufacturer's instructions, and shown to achieve
the claimed performance when tested in accordance with this European Standard
3.48
refuelling interval
period of time for which the combustion may be maintained in the appliance with a single load of fuel,
without intervention by the user
3.49
residue
ashes, including combustibles, which collect in the ashpit
3.50
secondary air
air supplied for the purpose of completing the combustion of gases leaving the fuel bed
3.51
slow combustion capability
ability of an appliance to continue operating at a low burning rate for a specified minimum period
without any input of fuel and without any interference with the combustion process, in such a manner
that the firebed can be recovered at the end of this period
3.52
slow combustion heat output
heat output achieved during the test period under slow combustion conditions
3.53
solid fuel
naturally occurring or manufactured solid mineral fuels, natural or manufactured wood logs and peat
briquettes
3.54
solid mineral fuel
coal, lignite, coke and fuels derived from these
3.55
space heating output
heat output provided by convection and radiation to the room
3.56
start-up device
mechanism to divert the path of the heating gases and/or to change the combustion air opening cross
section during the ignition period
3.57
steady-state condition
stage at which values to be measured in successive equal periods of time do not exhibit significant
change
3.58
test fuel
fuel of commercial quality being characteristic of its type to be used for testing appliances
3.59
thermostat
temperature sensitive device which automatically changes the combustion air inlet cross-sectional
area
3.60
type test pressure
pressure to which all waterways of the test appliance are subjected
3.61
thermal discharge control
mechanical device controlled by the water flow temperature which opens a drain in the water circuit of
a safety heat exchanger when a specified flow temperature is attained
3.62
top plate
top of the cooker including and surrounding the hotplate
3.63
total heat output
rate of useful heat released by the appliance
3.64
water heating output
heat output to water averaged during the test period
3.65
wet cooker
appliance that provides the facility to cook by means of a hotplate and/or an oven but which is also
fitted with a boiler that provides hot water for central heating and/or domestic use
NOTE The cooker also provides heat to the room in which it is installed.
3.66
winter/summer mode operation
alternative methods of operating certain cookers by a suitable control or by adaptation to give a lower
output for summer usage or a higher output in winter
3.67
working surfaces
all surfaces of an appliance designed to transmit heat to the surrounding atmosphere
NOTE All external surfaces of a cooker including the flue gas connector in accordance with this standard
are classified as working surfaces because they are designed to transmit heat to the room in which they are
installed.
4 Materials, design and construction
4.1 Production documentation
The type of appliance submitted for testing shall be stated and the appliance shall be tested using the
standard appropriate to that claim.
The parameters and characteristics considered in making the decisions in relation to either the family
or range of appliances to be submitted for initial type testing (see 8.2.1) shall be recorded. Where
changes are made to an appliance in the design, the raw material, the supplier of the components, or
in the production process, which would significantly alter the performance characteristics of the
appliance, especially in respect of one or more of the list of characteristics detailed in Table 8 and
Table 9, (see 8.2.2) these shall be recorded. A copy of the parameters and characteristics considered
in making the decisions shall be included in the production documentation for each appliance.
To identify the appliance, related documents and/or scaled assembly drawings shall be available
showing the basic design and construction of the appliance. The documentation and/or the drawings
shall include at least the following information:
 the specification of the materials used in the construction of the appliance;
 the manufacturer’s declared nominal heat output in kW using fuels recommended by the
manufacturer together with the declared minimum refuelling intervals for these fuels;
If the appliance is fitted with a boiler then the following additional details shall also be specified:
 the welding process used in the manufacture of the boiler shell;
NOTE The symbol for the type of weld used is sufficient.
 the permissible maximum operating water temperature in °C;
 the permissible maximum operating pressure in bar;
 the type test pressure in bar;
 the water heating output in kW.
4.2 General construction
4.2.1 Design, manufacture and assembly
The shape and dimensions of the components and equipment and the method of design and
manufacture, and if assembled on site the method of assembly and installation, shall ensure that,
when operated in accordance with the provisions of appropriate test(s) and exposed to the associated
mechanical, chemical and thermal stresses, the appliance shall operate reliably and safely such that
during normal operation no combustion gases posing a hazard can escape into the room in which the
appliance is installed nor can embers fall out.
Component parts such as covers, operating controls, safety devices and electrical accessories shall
be arranged in such a way that their surface temperatures, under the test conditions described
in A.4.9, do not exceed those specified either by the manufacturer or in the relevant component part
standard.
NOTE 1 Because the entire heat dissipating surfaces of the appliance including the flue spigot/socket and the
flue gas connector are working surfaces, there is no requirement for limiting the surface temperature of the
appliance.
No part of the appliance shall comprise of or contain asbestos. Hard solder, containing cadmium in its
formulation, shall not be used.
Where thermal insulation is used, it shall be made of non-combustible material and shall not be a
known hazard to health in its applied position.
NOTE 2 The thermal insulation should withstand normal thermal and mechanical stresses.
Component parts, which require periodic replacement and/or removal, shall be either so designed or
identified as to ensure correct fitting.
Parts which act as a seal shall be located securely, for example by means of bolts, gaskets or welding,
to prevent the ingress or leakage of air, water or combustion products.
Where a seal is made with fire cement, the cement shall be supported by adjacent metal surfaces.
If the appliance is fitted with a boiler the boiler shell and its materials of construction shall meet the
requirements given in 4.3 to 4.6 as appropriate to the material of construction and intended usage.
The boiler, if fitted, shall be capable of operating safely at the permissible maximum water operating
pressure declared by the manufacturer and shall meet the requirements specified in 5.5.
4.2.2 Durability
The durability aspects of the appliance shall be deemed to be satisfied if it is shown to meet the
constructional requirements specified in 4.3 to 4.22, the safety requirements specified in Clause 5 and
the performance requirements specified in Clause 6 of this standard.
NOTE The long practice with these products shows that such an approach for dealing with durability is
sufficient.
4.3 Boilers constructed of steel
4.3.1 Parts subject to water pressure
One or more of the steel materials complying at least with the specifications given in Table 1 shall be
used for the manufacture of those parts of the appliance subject to water pressure.

Table 1 — Steel material types
1)
References Material type Material numbers
EN10111:1998 DD 11 1.0332
DD12 1.0398
DD13 1.0335
DD14 1.0389
EN 10025 :2004 S235JR 1.0037
S235JRG2 1.0038
S235J0 1.0114
S235J2G3 1.0116
S275JR 1.0044
S275J0 1.0143
S275J2G3 1.0144
S355JR 1.0045
S355J0 1.0553
S355J2G3 1.0570
S355K2G3 1.0595
EN 10028-2 :2004 P195TR1 1.0107
P235GH 1.0345
P285QH 1.0478
P265GH 1.0425
P355NL1 1.0566
P295GH 1.0481
P355QH1 1.0571
P355GH 1.0473
16Mo3 1.5415
15NiCuMoNb5 1.6368
13CrMo4-5 1.7335
10CrMo9-10 1.7380
11CrMo9-10 1.7383
EN 10120 :2008 P245NB 1.0111
P265NB 1.0423
P310NB 1.0437
P355NB 1.0557
EN 10088-2 :2006 X5CrNi18-10 1.4301
X5CrNi17-12-2 1.4401
X2CrNiM017-13-2 1.4404
X6CrNiTi18-10 1.4541
X6CrNiNb18-10 1.4550
X2 CrMnNiN 22-5-2 1.4162
X2 CrNiN 23-4 1.4362
X2 CrNiMoN 22-5-3 1.4462
X1 NiCrMoCuN 25-20-7 1.4529
X1 NiCrMoCu 25-20-5 1.4539
X6CrNiMoTi17-12-2 1.4571
X6CrNiMoNb17-12-2 1.4580
X3CrNiMo17-3-3 1.4436
1) In accordance with EN 10027-2:1992.
NOTE Materials and wall thicknesses other than those specified may only be used on production of
appropriate evidence as regards at least their equivalent corrosion resistance, heat resistance and
strength to non-alloy steel at the material thicknesses specified in 4.2.2.1.2 for the particular
application/usage.
4.3.2 Nominal minimum wall thicknesses
Boilers constructed of steel shall have the appropriate wall thicknesses set out in Table 2.
The tolerances on the nominal minimum wall thicknesses for steels in Table 2 shall be as specified in
EN 10029:1991.
Table 2 — Steel - Nominal minimum wall thicknesses
Application Non-alloy Stainless and Non-alloy steels for
steels corrosion appliances burning
resistant steels wood only and having
maximum water
operating pressures of
up to and including 2 bar
mm mm mm
Walls of both the boiler
...