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BS EN 437:2021

BS EN 437:2021

$198.66

Test gases. Test pressures. Appliance categories

Published By Publication Date Number of Pages
BSI 2021 60
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This document specifies the test gases, test pressures and categories of appliances relative to the use of gaseous fuels of the first, second and third families. It serves as a reference document in the specific standards for appliances.

The document makes recommendations for the use of the gases and pressures to be applied for the tests of appliances burning gaseous fuels.

NOTE

Procedures for tests are given in the corresponding appliance standards. The test gases and the test pressures specified in this standard are in principle intended to be used with all types of appliances.

However, the use of some test gases and test pressures may not be appropriate in the following cases:

  1. appliances with nominal heat input greater than 300 kW;

  2. appliances constructed on site;

  3. appliances in which the final design is influenced by the user;

  4. appliances constructed for use with high supply pressures (notably direct use of the saturated vapour pressure).

In these cases, the specific appliance standards may specify other test conditions in order to establish compliance with their requirements.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 1 Scope
2 Normative references
3 Terms and definitions
9 4 Gases
4.1 Classification in gas families and groups
10 4.2 Test gases
14 5 Test pressures
16 6 Classification of appliances
6.1 Appliance categories
6.1.1 General
6.1.2 Category I
6.1.2.1 General
6.1.2.2 Appliances designed for use on first family gases only
17 6.1.2.3 Appliances designed for use on second family gases only
6.1.2.4 Appliances designed for use on 3rd family gases only
6.1.3 Category II
6.1.3.1 General
6.1.3.2 Appliances designed for use on gases of the first and second families
6.1.3.3 Appliances designed for use on gases of the second and third families
18 6.1.4 Category III
6.2 Operations permitted for a change of gas or pressure, adjustment and regulating devices
19 7 Choice of test gases and test pressures
20 8 Marking
21 Annex A (normative)Conditions for preparation of the test gases
22 Annex B (informative)National situations
B.1 General
B.2 Categories listed in the body of the standard marketed in the different countries
25 B.3 Appliance supply pressures corresponding to the categories given in B.1 and B.2
29 B.4 Special categories marketed nationally or locally
B.4.1 General
35 B.4.2 Categories
B.4.2.1 General
B.4.2.2 Category I
37 B.4.2.3 Category II
40 B.4.2.4 Category III
42 B.5 Test gases and test pressures corresponding to the special categories given in B.4
49 B.6 Special conditions
56 B.7 National and local gas distribution specifications relevant for defining appliance categories given in B.4
57 Annex C (informative)Guidelines for extension to other categories
58 Annex D (informative)Relationship between the distributed gases and the corresponding test gases

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BS EN 437:2021
$198.66