BS EN 16905-2:2020 pdf free download – Gas-fired endothermic engine driven heat pumps Part 2: Safety.
a) The metallic material shall be heatproof and anti-corrosion or of which the surface is given an anti- corrosion treatment.
b) The material other than metal shall be resistant to combustion gas and drain water.
5.2.4 Thermal insulation material, etc.
The thermal insulation material, sound absorbing material, etc. of the periphery of an engine shall be that which does not burn or naturally burns out within 10 s when it burns.
5.2.5 Vibration-proof material
The vibration-proof material which supports an engine shall be oilproof, heatproof and durable.
5.2.6 Materials and thicknesses of walls or tubes under water pressure of pressure class 3
5.2.6.1 General
The characteristics of the materials and the thicknesses of walls under pressure shall comply with the requirements of 5.2.6.2, 5.2.6.3 and 5.2.6.4. If other materials and/or other thicknesses are used, these shall have an equivalent level of fItness for purpose.
5.2.6.2 Materials
Materials for parts under pressure shall be appropriate for their duty and envisaged use. The following materials satisfy these criteria:
— steels that have the properties and chemical composition detailed in Table 1;
— cast irons that have the mechanical properties detailed in Table 2;
— the non-ferrous materials detailed in Table 3 and Table 4.
6 Operational requirements
6.1 General requirements
Except where otherwise stated, the operational requirements are verified by test of the GEHP appliance as defined in Clause 7.
Possible operational states of individual components have to be safe.
Failures of individual components, the possibility of an uncontrolled formation of flammable mixtures, the uncontrolled ignition of flammable mixtures as well as the uncontrolled leakage of flammable mixtures have to be avoided by using sufficient measures.
NOTE Due to the development of new technology, other solutions than those described in the following clauses are possible if these solutions provide specific instructions and at least an equivalent level of safety soundness.
6.2 Soundness
6.2.1 Soundness gas carrying circuit
The gas carryng circuit shall be soundness.
Soundness is assured, when the airtightness test is performed in accordance with 7.2.1, shall conform to each of following items.
a) The amount of internal air leakage which leaks through a shut-off valve shall be 100 cm3/h or less with the operation stopped.
b) There shall be no external leakage from a gas inlet connection to the engine inlet.
6.2.2 Soundness of the heating water circuit
6.2.2.1 General
The GEHP appliance and/or their sections shall withstand a hydraulic test according their classification as stated in 4.3.
6.2.2.2 GEHP appliance for class 1 and 2
Under the test conditions of 7.2.2.2, there shall be neither leakage during the test, nor permanent visible distortion, at the end of the test.