BRITISH STANDARD Test gases — Test pressures — Appliance categories ICS 27 060 20; 91 140 40 ����������� � ��� � ������������������� ��������� ��� ���������� ��� BS EN 437 2003+A1 2009 BS EN 437 2003[.]
Classification
Gases are categorized into three main families, which can further be subdivided into groups based on their Wobbe index, as detailed in Table 1 and Annex B.
Table 1 – Summary of gas families and groups as a function of the Wobbe indices
Gas families and groups Gross Wobbe index at 15 °C and 1 013,25 mbar
Test gases
The composition and principal characteristics of the different test gases corresponding to the gas families or groups are given in Tables 2 and 3
In particular cases specified in the individual appliance standards, gas G 24, whose characteristics are given in
Table 3, may be used but only at the normal test pressure
The calorific values of third family gases can be represented in megajoules per cubic metre, as detailed in Table 2, and can also be converted to megajoules per kilogram of dry gas, as indicated in Table 3.
!The values in Tables 2 and 3, measured and expressed at 15 °C, are derived from EN ISO 6976:2005."
The conditions for the preparation of the test gases are given in annex A
!Table 2 – Characteristics of the test gases a for the first and second families, gas dry at 15 °C and 1 013,25 mbar
Test gases Designation Composition by volume
% c MJ/m 3 MJ/m 3 MJ/m 3 MJ/m 3 Gases of the first family b
Incomplete combustion, flame lift and sooting limit gas
N2 = 24 Light back limit gas G 112 CH4 = 17
N2 = 24 Gases of the second family b
Incomplete combustion and sooting limit gas
C3H8 = 13 Light back limit gas G 222 CH4 = 77 42,87 28,53 47,87 31,86 0,443
H2 = 23 Flame lift limit gas G 23 CH4 = 92,5 41,11 31,46 45,66 34,95 0,586
Over heating limit gas d G 24 CH4 = 68 47,01 35,70 52,09 39,55 0,577
H2 = 20 Group L Reference gas light back limit gas
Incomplete combustion and sooting limit gas
N2 = 13 Flame lift limit gas G 27 CH4 = 82 35,17 27,89 39,06 30,98 0,629
Incomplete combustion and sooting limit gas C3H8 = 13
Light back limit gas G 222 CH4 = 77 42,87 28,53 47,87 31,86 0,443
H2 = 23 Flame lift limit gas G 231 CH4 = 85 36,82 28,91 40,90 32,11 0,617
N2 = 15 Over heating limit gas d G 24 CH4 = 68 47,01 35,70 52,09 39,55 0,577
H2 = 20 a For gases used nationally or locally, see B.5 b For other groups, see B.5 c See also Annex A d Limit gas used only for certain types of appliance, specified in the individual appliance standards
!!Table 3 - Characteristics of the test gases a for the third family, gas dry at 15 °C and 1 013,25 mbar
Test gases Designation Composition by volume
% d MJ/m 3 MJ/m 3 MJ/kg MJ/m 3 MJ/m 3 MJ/kg Gases of the third family b
Groups B/ P Incomplete combustion and sooting limit gas
Flame lift limit gas G 31 C3H8 = 100 70,69 88,00 46,34 76,84 95,65 50,37 1,550 and B Light back limit gas G 32 C3H6 = 100 68,14 82,78 45,77 72,86 88,52 48,94 1,476 Group P Reference gas,
Incomplete combustion, flame lift and sooting c limit gas
Light back and sooting limit gas c
G 32 C3H6 = 100 68,14 82,78 45,77 72,86 88,52 48,94 1,476 a For gases used nationally or locally, see B.5 b For other groups, see B.5 c The appliance standards may only specify one sooting limit gas d See also Annex A
The characteristics of second family gases at reference conditions different from 15 °C for metering and combustion can be determined using the coefficients specified in EN ISO 13443:2005, Annex A For instance, Table 4 provides the characteristics of reference gases from the second family at 0 °C for both metering and combustion at a pressure of 1,013.25 mbar (dry gas).
!Table 4" – Characteristics of the reference gases of the second family at 0 °C and 1 013,25 mbar
Gas group Test gas Designation Composition by volume
Group L Reference gas, light back limit gas
The values of the test pressures, i.e the static pressure to be applied at the gas inlet connection to the appliance whilst in operation, are given in Tables 6 and 7
NOTE For Tables 6 and 7, the test conditions will be specified in the individual appliance standards
For the combustion test in still air using gas G 21, the appliance is initially set to gas G 20, achieving a 5% increase in nominal heat input when a gas pressure governor is present, and a 7.5% increase when it is absent After this adjustment, gas G 21 is substituted for G 20 without changing the initial settings.
Ignition and crosslighting tests must be conducted at an inlet pressure of 0.7 times the normal pressure (pn) utilizing the reference gas(es) for both the first and second families.
!!Table 5" – Test pressures where no pressure couple exists a
Appliance categories having as index Test gas Pn pmin pmax
For test pressures related to gases distributed nationally or locally, refer to Table B.5 Appliances in this category can operate without adjustment at supply pressures ranging from 28 mbar to 30 mbar Tests with gases G 31 and G 32 are conducted at a normal pressure of 29 mbar, which is more stringent than any gas typically distributed, ensuring coverage of normal variations in gas supply For further details, see definition in section 6.1.2.2.
!Table 6"" – Test pressures where a pressure couple exists
!Appliance categories having as index
Test gas pn Pmin pmax
The specified pressure range of 28 mbar to 30 mbar allows for the use of appliances in this category without adjustment Although the pressure of 112''148 corresponds to low Wobbe index gas, no tests are conducted at this pressure For further details, refer to section B.6.
Appliance categories
General
Appliances are classified into categories defined according to the gases and the pressures for which they are designed
The definition of the categories follows from 6.1.2, 6.1.3 and 6.1.4
In every country, the marketing of gas categories is influenced by local distribution conditions, including gas composition and supply pressures Furthermore, specific categories are designated for use with particular types of appliances, as outlined in the respective standards.
The marketing conditions for various appliance categories and their associated supply pressures in each country are detailed in Tables B.1, B.2, and B.3 Additionally, Table B.4 outlines the categories marketed both locally and nationally, along with the relevant gases and specific supply pressures listed in Table B.5 Table B.6 provides specific conditions applicable to certain countries.
NOTE See also annex C: Guidelines for extension to other categories.
Category I
Appliances of category I are designed exclusively for the use of gases of a single family or of a single group
6.1.2.1 Appliances designed for use on first family gases only
Category I 1a : appliances using only gases of group a of the first family at the prescribed supply pressure (this category is not used)
6.1.2.2 Appliances designed for use on second family gases only
Category I 2H : appliance using only gases of group H of the second family at the prescribed supply pressure
Category I 2L : appliances using only gases of group L of the second family at the prescribed supply pressure
Category I 2E : appliances using only gases of group E of the second family at the prescribed supply pressure
Category I 2E+ : appliances using only gases of group E of the second family, and operating with a pressure couple without adjustment on the appliance The appliance gas pressure regulating device, if it exists, is not operative at pressures in between the two normal pressures of the pressure couple
Category I2N: appliances using only second family gases at the prescribed supply pressure and that automatically adapt to all gases of the second family
!Category I2R: appliances having a pressure regulator which can be manually adjusted in order to utilize each of the following gas groups: H, E, L and LL (see Table B.6)."
6.1.2.3 Appliances designed for use on 3 rd family gases only
Category I 3B/P : appliances capable of using the third family gases (propane and butane) at the prescribed supply pressure
Category I 3+ : appliances capable of using gases of the third family (propane and butane) and operating with a pressure couple without adjustment of the appliance However, for certain types of appliance specified in the particular standards, adjustment of the primary combustion air may be permitted when changing from propane to butane and vice versa No gas pressure regulating device is permitted on the appliance
Category I 3P : appliances using only gases of group P of the third family (propane) at the prescribed supply pressure Category I 3B : appliances using only gases of group B of the third family (butane) at the prescribed supply pressure
Category I3R refers to appliances equipped with a manually adjustable pressure governor that can operate using all gases from the third family These appliances are designed to adapt to the specific local distribution conditions of various gases within this group.
Category II
Appliances of category II are designed for use on gases of two families
6.1.3.1 Appliances designed for use on gases of the first and second families
Category II 1a2H : appliances capable of using gases of group a of the first family and gases of group H of the second family The first family gases are used under the same conditions as for category I 1a The second family gases are used under the same conditions as for category I 2H
6.1.3.2 Appliances designed for use on gases of the second and third families
Category II 2H3B/P : appliances capable of using gases of group H of the second family and gases of the third family The second family gases are used under the same conditions as for category I 2H The third family gases are used under the same conditions as for category I 3B/P
Category II 2H3+ : appliances capable of using gases of group H of the second family and gases of the third family The second family gases are used under the same conditions as for category I 2H The third family gases are used under the same conditions as for category I 3+
Category II 2H3P : appliances capable of using gases of group H of the second family and gases of group P of the third family The second family gases are used under the same conditions as for category I 2H The third family gases are used under the same conditions as for category I 3P
Category II 2L3B/P : appliances capable of using gases of group L of the second family and gases of the third family The second family gases are used under the same conditions as for category I2L The third family gases are used under the same conditions as for category I3B/P
Category II2L3P refers to appliances designed to utilize gases from Group L of the second family and Group P of the third family The operational conditions for the second family gases align with those specified for category I 2L, while the third family gases are used under the same conditions as those for category I 3P.
Category II 2E3B/P : appliances capable of using gases of group E of the second family and gases of the third family The second family gases are used under the same conditions as for category I 2E The third family gases are used under the same conditions as for category I 3B/P
Category II 2E+3B/P : appliances capable of using gases of group E of the second family and gases of the third family The second family gases are used under the same conditions as for category I 2E+ The third family gases are used under the same conditions as for category I 3B/P
Category II 2E+3+ : appliances capable of using gases of Group E of the second family and gases of the third family The second family gases are used under the same conditions as for category I 2E+ The third family gases are used under the same conditions as for category I 3+
Category II 2E+3P : appliances capable of using gases of group E of the second family and gases of group P the third family The second family gases are used under the same conditions as for category I 2E+ The third family gases are used under the same conditions as for category I 3P
Category II2R3R appliances are designed to operate with pressure governors, utilizing all gases from the second family and related gases, as well as all gases from the third family These appliances can be manually adjusted to accommodate various gases from the second family based on local distribution conditions The usage of second family gases aligns with the conditions specified for category I 2R, while third family gases are used under the same conditions as category I 3R (refer to Tables B.6 to B.8).
Category III
Appliances of category III are designed for use on gases of three families
This category is not in general use
The categories III accepted in specific countries are given in annex B (see B.4).
Operations permitted for a change of gas or pressure, adjustment and regulating devices
The individual appliance standards will specify
the operations permitted for a change of gas or of pressure ;
NOTE As far as possible the permitted conversion operations should be limited so as to ensure that the conversion may be effected without difficulty
the conditions applicable to adjustment and regulation devices
7 Choice of test gases and test pressures
According to the appliance category
the tests are carried out with the gases given in Table 7;
the test pressures are chosen from Tables 5 and 6, as appropriate, as a function of the test gas and in accordance with the requirements given in the individual appliance standards
!!Table 7" – Test gases corresponding to the appliance categories a b
Category Reference gas Incomplete combustion limit gas
Lift limit gas Sooting limit gas
For the test gases categorized for national or local markets, refer to Table B.4 Tests involving limit gases are conducted using the injector and adjustments specific to the reference gas group of the limit gas The heat inputs must be equivalent and adhere to the tolerances outlined in the appliance standards Additionally, since burner adjustments automatically change with different test gases, it is essential to evaluate all phenomena, such as incomplete combustion, sooting, light back, and flame lift, across all test gases.
The marking of a category comprises:
in Roman numerals, the number of utilizable gas families;
in an Arabic numeral suffix, the number assigned to the gas family considered, i.e 1 for the first family, 2 for the second and 3 for the third;
in the suffix following that numeral, the capital letter or letters designating the utilizable gas group or groups, respectively
The suffix in the Roman numeral indicates the compatibility of the appliance with various gas families, allowing for use with different gas groups without the need for adjustments or adaptations.
When an appliance can utilize gases from groups E or B/P, which include more restricted groups defined by a Wobbe number range, the supply pressure can be adjusted based on the pressure couple principle This condition for the relevant gas group is indicated by a "+" sign after the letter E or by the digit 3 for group B/P, where the group symbol is substituted with the digit 3, representing the third family.
Conditions for preparation of the test gases
The gases utilized for testing must closely match the composition outlined in Table 2 To prepare these gases, specific guidelines must be followed.
The Wobbe index of the gas utilized must remain within ± 2% of the specified value in the table for the corresponding test gas, accounting for measurement instrument errors.
The constituents for preparing the mixtures must meet specific purity standards: nitrogen (N₂) should be at least 99%, hydrogen (H₂) at least 99%, and methane (CH₄) at least 95% Additionally, the total content of hydrogen, carbon monoxide, and oxygen must be below 1%, while the total content of nitrogen and carbon dioxide should not exceed 2% Furthermore, propene (C₃H₆), propane (C₃H₈), and butane (C₄H₁₀) must each have a minimum purity of 95%.
The final mixture can have the same composition as one made from components meeting specific conditions, even if those conditions are not strictly required for each component Consequently, it is feasible to create a mixture by beginning with a gas that already contains several components in appropriate proportions.
However, for gases of the 2 nd family:
For tests using reference gases G 20 or G 25, a gas from group H, L, or E can be utilized, even if its composition does not meet the specified criteria This is acceptable as long as, after adding propane or nitrogen as needed, the resulting mixture achieves a Wobbe index within ± 2% of the value listed for the corresponding reference gas in the table.
for preparation of the limit gases another gas may be used as the base gas instead of methane
for limit gases G 21, G 222, G 23 and G 24, a natural gas of group H may be used;
for limit gases G 27 and G 231, a natural gas of group H , L or E may be used;
for the limit gas G 26, a natural gas of group L may be used
The final mixture, achieved by incorporating propane or nitrogen, must maintain a Wobbe index within ± 2% of the specified value in Table 2 for the corresponding limit gas, while the hydrogen content of the mixture should also align with the values outlined in Table 2.
1) A mixture of iso/n butane is permitted Appliance standards may be more precise on the composition of the mixture and the purity of the gases.
General
In each country in which this standard applies, appliances may be marketed only if they comply with the particular national supply conditions of that country
To facilitate the correct selection of appliances during testing and sales, a summary of various national situations is provided in Tables B.1, B.2, B.3, B.4, and B.5.
In accordance with !EN ISO 3166-1:2006", the names of countries shall be represented by the following codes:
CZ Czech Republic LV Latvia
GB United Kingdom SE Sweden
Categories listed in the body of the standard marketed in the different countries
Tables B.1.and B.2 give the national situations concerning the marketing in the various countries of the appliance categories listed in the body of the standard
The information given in these tables indicates only that these categories may be sold throughout the whole of the country concerned and B.4 has to be consulted for confirmation
In all cases of doubt, the local gas supplier should be consulted in order to identify the precise category applicable
!Table B.1 – Category I (single categories) marketed
The SK categories are designated for specific types of appliances as outlined in their individual standards Certain categories apply exclusively to appliances that undergo the on-site EC verification procedure, in accordance with Annex II, Article 6 of the Gas Appliance Directive (90/396/CEE) Additionally, there is a category specifically for appliances installed in touring and motoring caravans.
The symbol (?) placed alongside the names of the countries means that the country concerned has not indicated its choice of category
!Table B.2 – Category II (double categories) marketed
Country code II1a2H II2H3B/P II2H3+ II2H3P a II2L3B/P II2L3Pa II2R3Ra II2E3B/P II2E+3B/
Certain categories are designated for specific types of appliances as outlined in individual standards, while other categories apply exclusively to appliances that undergo the on-site EC verification procedure.
According to Annex II, Article 6 of the Gas Appliance Directive (90/396/EEC), appliances designed for group H gases of the second family can utilize air and commercial propane gas mixtures with a gross Wobbe index ranging from 46 MJ/m³ to 51.5 MJ/m³ at a supply pressure of 15 °C and 1,013.25 mbar, without the need for additional testing.
The symbol (?) placed alongside the names of the countries means that the country concerned has not indicated its choice of category.
Appliance supply pressures corresponding to the categories given ! !in B.1 and B.2"
Table B.3 gives the conditions in the various countries concerning the supply pressures to appliances in the categories given !in B.1 and B.2"
The normal pressures are identified by the reference gas or gases of the gas group
For the first family, the normal pressure is identified by the sole reference gas G 110
FR g h xf xf x x xb x xb x x x xb
For specific non-domestic appliances, a pressure of 17.5 mbar is required This applies only to certain types of non-domestic and industrial appliances Additionally, it is relevant for gas appliances used in boats and leisure accommodation vehicles Certain categories are applicable exclusively to specific appliances that undergo the on-site EC verification procedure, as outlined in Annex II, Article 6.
The Gas Appliance Directive (90/396/CEE) outlines specific national categories and groups related to gas appliances For detailed information on national categories, refer to section B.4, while section B.5 provides insights into specific national groups and pressures Additionally, section B.6 details the specific national pressures applicable to these appliances It is important to exercise caution when using appliances categorized as I3P(B/P), as they operate within the pressure range specified in section B.6.
The symbol (?) placed alongside the names of the countries means that the country concerned has not indicated its choice of category
Special categories marketed nationally or locally
The national and local conditions of gas distribution, including gas composition and supply pressures, determine the specific categories outlined in B.4.2 that are marketed in various countries Table B.4 presents these categories along with the associated test gases for each country, while Table B.5 details the characteristics of these test gases and their corresponding test pressures.
!Table B.4 – Test gases corresponding to categories marketed nationally or locally
Lift limit gas Sooting limit gas
Category Reference gas Incomplete combustion gas
Light back limit gas Lift limit gas Sooting limit gas Country
Category Reference gas Incomplete combustion gas
Light back limit gas Lift limit gas Sooting limit gas Country
The G 32, G 23, G 31, and G 30 categories apply exclusively to specific types of appliances as outlined in their respective standards For detailed pressure specifications, refer to section B.6 These categories have been valid in Denmark since October 2007 and are applicable only to appliances with a capacity of less than 12 kW, operating at a standard pressure of 37 mbar for both butane and propane.
B.4.2 The definitions of the categories in Table B.4 are derived in the same way as those categories listed in 6.1 The characteristics of the gases distributed regionally are given in Table B.5
B.4.2.1.1 Appliances designed for the use of gases linked to the first family
Category I 1b : appliances using only gases of group b linked to the first family, at a fixed supply pressure (this category is not used)
Category I 1c : appliances using only gases of group c linked to the first family, at a fixed supply pressure (this category in not used)
!Category I 1Lm : appliances using only of group Lm gases linked to the first family at the prescribed supply pressure (this category is not used)."
Adjusting the gas rate is optional when replacing a gas from one group with another within the first family and its associated gases.
B.4.2.1.2 Appliances designed for the use of gases of the second family and the gases linked to it
Category I2E(S) appliances are designed to operate exclusively with gases from group E, similar to those in category I2E+ These appliances are equipped with a gas pressure governor, which is factory-adjusted and sealed to ensure compatibility with G 20 gas at a pressure of 20 mbar.
Category I2E(R) appliances are designed to operate exclusively with gases from group E, similar to category I2E+ These appliances include a gas pressure governor, factory-set for G 20 at 20 mbar However, installers can adjust the settings for G 25 at 25 mbar, unless the appliances are permanently connected to a gas supply network within the Ei range.
!Category I 2LL : appliances using only gases of group LL linked to the second family, at a fixed supply pressure
The appliance can be adjusted to a lower nominal value, provided that the gross Wobbe index of the second family gas does not exceed the upper limit of 43.7 MJ/m³.
Category I 2ELL refers to appliances designed to utilize gases from group E of the second family, as well as gases from group LL associated with the same family The operational conditions for gases from group E are identical to those specified for category I 2E, while the gases from group LL are also used under the same conditions as outlined for their respective category.
Category I 2Esi appliances are designed to operate exclusively with gases from group E of the second family, functioning under the appropriate pressure of a pressure couple When substituting a gas from the Es range (with a gross Wobbe index between 44.8 MJ/m³ and 54.7 MJ/m³) for a gas from the Ei range (with a gross Wobbe index between 40.9 MJ/m³ and 44.8 MJ/m³), it is essential to adjust the burner settings and potentially replace injectors, restrictors, and atmosphere control devices.
Category I 2Er appliances are designed to operate exclusively with gases from group E of the second family, functioning effectively with a pressure couple without the need for adjustments While optional, specific adjustments to the burner gas rate may be made when replacing a gas from the Es range of group E (with a gross Wobbe index between 44.8 MJ/m³ and 54.7 MJ/m³) with a gas from the Ei range of group E (with a gross Wobbe index between 40.9 MJ/m³ and 44.8 MJ/m³) If such an adjustment is performed, it is essential to readjust the appliance to its original settings before reverting to the use of gas from the Es range of group E.
!Category I2S : appliances using only gases of group S linked to the second family at the prescribed supply pressure (this category is not used)
Category I2HS includes appliances designed to utilize gases from group H of the second family, as well as gases from group S associated with the same family The gases from group H are employed under conditions identical to those specified for this category.
I2H The gases of group S of the second family are used under the same conditions as for category I2S
Category I2M : appliances using only gases of group M linked to the second family at the prescribed supply pressure (this category is not used)
Category I2HM includes appliances designed to utilize gases from group H of the second family, as well as gases from group M associated with the same family The gases from group H are employed under conditions similar to those applicable to this category.
I2H The gases of group M of the second family are used under the same conditions as for category I2M
Category I 2Lw : appliances using only of group Lw gases linked to the second family at the prescribed supply pressure (this category is not used)
Category I 2Ls : appliances using only of group Ls gases linked to the second family at the prescribed supply pressure (this category is not used)
Category I 2Ln : appliances using only of group Ln gases linked to the second family at the prescribed supply pressure (this category is not used)
Category I 2ELw includes appliances designed to utilize gases from group E of the second family, as well as gases from group Lw associated with the same family The gases from group E of the second family are employed under conditions similar to those applicable to this category.
I2E The gases of group Lw of the second family are used under the same conditions as for category I2Lw
Category I2ELs refers to appliances designed to utilize gases from group E of the second family, as well as gases from group Ls associated with the same family These gases from group E are employed under conditions similar to those applicable to this category.
I2E The gases of group Ls of the second family are used under the same conditions as for category I2Ls
Category I2ELn includes appliances designed to utilize gases from group E of the second family, as well as gases from group Ln associated with the same family These gases from group E are employed under conditions identical to those applicable to this category.
I2E The gases of group Ln of the second family are used under the same conditions as for category I2Ln
Category I 2ELwLs refers to appliances designed to utilize gases from the E second family, as well as gases from groups Lw and Ls associated with the second family These E group gases are employed under the same conditions applicable to category I2E.
Lw and Ls are used accordingly under the same conditions as for category I2Lw and category I2Ls
Test gases and test pressures corresponding to the special categories given in B.4
The characteristics of the test gases corresponding to the gases distributed nationally or locally and the test pressures are given in Table B.5
The values in Table B.5 measured and expressed at 15 °C are derived from !EN ISO 6976:2005"
!Table B.5 – Test gases and test pressures corresponding to national or local situations, dry gas at 15 °C and 1 013,25 mbar
Gas family Nature of gas
Gases linked to the first family group b
Reference Incomplete combustion and sooting
Reference Incomplete combustion (methane-air)
DK Light back limit G 152 CH 4 = 40
Gas family Nature of gas
Gases linked to the second family group
Incomplete HU combustion and sooting limit gas
Gas family Nature of gas
Incomplete combustion and sooting limit gas
The composition of air consists of 20.95% oxygen (O₂) and 79.05% nitrogen (N₂) For reference gases G 20 and G 25, their characteristics at 0 °C are detailed in Table 4 In specific cases outlined in the relevant standard, the overheat limit gas G 24 is utilized only at normal test pressure Notably, gases G 2.302 and G 1.251 share the same composition but differ in pressure.
Special conditions
In Austria, all appliances classified as I3P and II2H3P, except for type A appliances, must pass a combustion test using the incomplete combustion limit gas G 30 at a standard pressure of 50 mbar, after adjusting the nominal heat input with gas G 31 at the same pressure.
Appliances of categories I2E+, I2E(R)B, I2E(S)B and I2N marketed in Belgium shall have successfully undergone a test for ignition, crosslighting and flame stability with the limit gas G 231 at the reduced pressure of 15 mbar
Appliances of category I2N and I2R shall have successfully undergone a test with the flame lift limit gas G 271 at a pressure of 25 mbar
Appliances of categories with index 2H and 2HS shall be tested with the test gases given for 2H in Table 5 but with the following pressures:
− pn = 25 mbar, pmin = 18 mbar and pmax = 33 mbar
− or both pn = 25 mbar, pmin = 18 mbar, pmax = 33 mbar and pn = 85 mbar, pmin = 73 mbar, pmax = 100 mbar."
Appliances of categories I 3B/P , II 2H3B/P and III 1a2H3B/P without pressure regulators marketed in Italy shall have successfully undergone a test for flame stability with the limit gas G 31 at a pressure of 45 mbar
Appliances of categories with index 3P(B/P) shall be tested with the test gases for 3B/P given in Table 5 but with the following pressures: pn = 37 mbar, pmin = 25 mbar and pmax = 45 mbar
Appliances of categories with index 2L shall be tested with the test gases for 2L given in Table 5 but with the following pressures: pn = 20 mbar, pmin = 17 mbar and pmax = 25 mbar."
Appliances classified as I2R, I3R, and II2R3R must be labeled in accordance with the national specifications for the reference gas and the nominal pressure pertinent to the destination country, as detailed in tables B.6, B.7, and B.8.
Adjustment Test pressures (mbar) Test gases
Gas Group Country Type of gas a
Supply pressure (mbar) p n p min p max Reference Incomplete combustion Light back Flame Lift Sooting
Additional methods for identifying gas types may be necessary (refer to CR 1472) This is applicable only to specific appliances that undergo the on-site verification process as outlined in Annex II, Article 6 of the Gas Appliance Directive (90/396/EEC) For certain non-domestic appliances, the supply pressure is set at 17.5 mbar, while it is currently 18 mbar for others When supplied under conditions similar to category I 2E(S), adjustments may be required for range Ei, as noted in B.5 Similarly, for category I 2E(R), adjustments for range Ei are also necessary, as detailed in B.6 Adjustments for ranges Es and Ei are required when supplied under conditions for categories I 2Esi or I 2Er.
Adjustment Test pressures (mbar) Test gases
Gas Group Country Type of gas a
Supply pressure (mbar) p n p min p max Reference Incomplete combustion Light back Flame Lift Sooting
Additional methods for identifying gas types may be necessary, as outlined in CR 1472 These methods apply only to specific appliances detailed in individual standards Certain appliances can operate without adjustments at supply pressures ranging from 28 mbar to 30 mbar, particularly for specific industrial and non-domestic appliances Testing with gases G 31 and G 32 occurs at a normal pressure of 29 mbar, which is more stringent than typical gas distributions, accounting for normal supply variations Appliance standards may only define one limit for sooting gas.
Adjustment Test pressures (mbar) Test gases
Gas Group Country Type of gas a
Supply pressure (mbar) p n p min p max Reference Incomplete combustion Light back Flame Lift Sooting
Table B.8 – Category II 2R3R ( con t inued )
Adjustment Test pressures (mbar) Test gases
Gas Group Country Type of gas a
Supply pressure (mbar) p n p min p max Reference Incomplete combustion Light back Flame Lift Sooting
Additional methods for identifying gas types may be necessary, as outlined in CR 1472 Appliances can operate without adjustments at supply pressures ranging from 28 mbar to 30 mbar, applicable to specific industrial appliances Certain appliances are subject to individual standards and must undergo the CE on-site verification procedure as per Annex II, Article 6 of the Gas Appliance Directive (90/396/CEE) For some non-domestic appliances, the required supply pressure is 17.5 mbar, and appliance standards may only define one sooting limit gas, applicable exclusively to specific non-domestic appliances.
Guidelines for extension to other categories
To ensure an appliance conforms to additional categories, it is essential to verify that it meets all the requirements of those new categories.
To establish the new category(ies), it is essential to compare the required tests with those conducted for the original category(ies) to identify any additional necessary tests.
These additional tests should be kept to the minimum necessary to ensure that the appliance would satisfy the requirements applicable to the new category(ies)
Individual appliance standards may give more detailed examples of circumstances in which such additional tests are required
National situation of countries whose national bodies are CEN affiliate members
AL Albania MK Republic of Macedonia
Categories listed in the body of the standard and marketed in the different countries" "
Table D.1 – Category I (single categories) marketed
Table D.2 – Category II (double categories) marketed Code II 1a2H II 2H3B/P II 2H3+ II 2H3P II 2H3B II 2H3R II 2L3B/P II 2L3P II 2E3B/P II 2E+3+ II 2E+3P II 2R3R
D.3 Supply pressures of the appliances
[1] EN ISO 13443:2005, Natural gas - Standard reference conditions (ISO 13443:1996 including Corrigendum