BS EN 437:2021 pdf free

BS EN 437:2021 pdf free.Test gases –  Test pressures – Appliance categories.
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:
— appliances with nominal heat input greater than 300 kW;
— appliances constructed on site;
appliances in which the final design is influenced by the user;
— 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 3166-1:2020, Codes for the representation of names of countries and theirsubdivisions – Part 1: Country code (ISO 3166-1:2020)
EN ISO 6976:2016, Natural gas – Calculation of calorific values, density, relative density and Wobbe indicesfrom corn position (ISO 6976:2016)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http:JJwww,isoorg/nhp.BS EN 437 pdf free download.