bsen14470-2-20xxfiresafetystoragecabinets—part2safetycabinetsforpressurisedgascylinders

bsen14470-2-20xxfiresafetystoragecabinets—part2safetycabinetsforpressurisedgascylinders内容摘要：

e type tests (for the storage of flammable liquids EN 144701 is applicable – the criteria for failure are different – see Annex A). 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13631:1999, Fire resistance tests — Part 1: General requirements EN ISO 13943:2020, Fire safety — Vocabulary (ISO 13943:2020) ISO 3864 (all parts), Graphical symbols Safety colours and safety signs 3 Terms and Definitions For the purposes of this document, the terms and definitions given in EN ISO 13943:2020 and the following apply. type specimen of a design manufactured with the characteristics intended for serial production type testing conformity testing on the basis of one or more specimens of product representative of the production EN 144702:2020 (E) 6 4 Classification A gas cylinder cabi shall be classified as one of the Types listed in Table 1. Table 1 — Fire safety cabi for pressurised gas cylinder Type classification Type Time taken for Ta to rise by 50 K min Test according to EN 13631:1999 Ventilation connection facility required G15 ≥ 15 Yes Yes G30 ≥ 30 Yes Yes G60 ≥ 60 Yes Yes G90 ≥ 90 Yes Yes a T is the temperature taken on the surface of the gas cylinder valve spanner flat. 5 Construction Fire protection The cabi shall be designed and constructed to ensure that, in the event of a fire, the contents of the cabi do not contribute any additional risks or spread the fire for at least 15 minutes. Ventilation Cabis shall be equipped with openings for inlet and exhaust air, which allows for connection of an exhaust air system to the cabi. In a ventilated cabi in which ventilation is taking place, with the doors closed, latched and locked, the following extraction rates shall apply:  when using flammable and fire supporting gas, at least 10 air changes of the cabi39。 s volume per hour。  when using toxic gas, at least 120 air changes of the cabi39。 s volume per hour. Under the above conditions the pressure drop shall not exceed 150 Pa. The ventilation system shall maintain a lower pressure in the cabi than in the surrounding atmosphere. Ventilation shall take place on the top and bottom of the cabi. Design of the air circulation system within the cabi shall ensure adequate purging from minor leakage. This shall be tested by visual inspection and by measuring the air flow and pressure drop while the cabi is empty. NOTE The inlet pressure drop and the number of air changes have been chosen to provide purging efficiency. In the event of a fire, the inlet and exhaust vents shall close automatically. The vents39。 closing system shall be tested as part of the fireresistance test in Annex A. EN 144702:2020 (E) 7 Gas cylinder restraining Within the cabi a suitable system shall be installed to prevent gas cylinders from falling over. The system shall be suitable for the quantity and dimensions of cylinders, which can be used in accordance with the user39。 s instruction manual. Insertion and removal of pressurised gas cylinders The cabi shall be constructed so that cylinders can be inserted and removed as safely as possible with minimum manual effort. For example, when cabi bases are above floor level a ramp and/or mechanical lifting equipment can be employed, however, these shall not be made of aluminium. Installation of gas pipelines (for gas cylinders in use) The number of pipe perations through the wall or roof of the cabi shall be restricted to the minimum necessary and a maximum of 3 for each cylinder. Unused holes/perations shall be sealed in accordance with the user39。 s instruction manual. The three holes should have a maximum diameter of 10 mm each. NOTE In order to maintain the fire resistance as tested and specified in accordance with Annex A (see ), it is remended that the pipes are made from stainless steel or from a material of similar thermal conductivity. Installation of electric cables (where appropriate) The number of perations through the wall or roof of the cabi shall be restricted to the minimum necessary and a maximum of 2 for each cylinder. Unused holes/perations shall be sealed in accordance with the user39。 s instruction manual. The two holes should be a maximum diameter of 20 mm each. 6 Fire resistance The fire resistance of the cabi for storing pressurised gas cylinders shall be determined by a type test. This type test is performed by heating the cabi in a furnace according to the timetemperature curve described in clause of EN 13631:1999 and measuring the temperature increase on the surface of an empty gas cylinder within the cabi. The temperature increase on the surface of the cylinder valve spanner flat (see Figure ) shall not exceed 50 K. Test details are given in Annex A. 7 Information to be supplied The cabi manufacturer shall supply with the cabi a user information manual, which includes at least the following: a) instructions for correct cabi installation。 b) maximum bined volumetric capacity of the gas cylinders stored within the cabi。 c) safety procedure instructions in the event of fire, particularly the minimum time, when after a fire, the doors can be safely opened。 d) instructions concerning the effect of gas pipes passing through (peration of) the walls and roof of the cabi, particularly the potential of reduced fire resistance。 e) instructions to correctly seal the unused gas pipe feeds through the cabi (peration to the cabi’s walls and roof)。 f) warning th。