EN 14470
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DIN EN 14470 |
|---|---|
| Area | Osh |
| title | Fire resistant storage cabinets - Part 1: Safety cabinets for flammable liquids; Part 2: Safety cabinets for pressurized gas cylinders |
| Brief description: | Storage of flammable liquids and gas bottles |
| Latest edition | Part 1: 2004-03; Part 2: 2006-11 |
| ISO | - |
The EN 14470 is a divided into two parts European standard for "Fire safety storage cabinets." Part 1 of the standard " Safety cabinets for flammable liquids" has been in force in Germany since 2004. In 2006, EN 14470-2, the second part of the standard "Safety cabinets for pressurized gas cylinders ", was introduced. In Germany, the EN 14470 standard replaces the previous national standards DIN 12925-1 and 2 from 1988 and 1998, respectively.
Goal of the norm
The standard was put into effect within the framework of European harmonization with the aim of bringing the various national safety regulations to a uniform level. It is therefore mandatory for all member states of the European Union .
Contents of the standard
EN 14470 specifies requirements for the construction of the cabinet as well as its ability to withstand external fire exposure. The main requirements include:
- In the event of fire, cabinet doors must be completely self-closing from every position (closing time max. 20 seconds)
- In the event of fire, self-foaming fire protection seals seal the safety cabinet.
- Built-in door locking systems must release locked doors at a temperature of 50 (−10) ° C.
- The cabinets must be equipped with air intake and exhaust openings which enable the cabinet to be connected to a technical ventilation system and thus prevent the accumulation of dangerous gas-air mixtures. The ventilation openings must close automatically at a temperature of 70 ° C (± 10 ° C). If no technical ventilation is used, it is mandatory to create appropriate explosion protection zones around the cabinet.
The temperature release element (fusible link) used to automatically close the doors and air openings must be placed in freely circulating air so that it can heat up quickly. In the event of a fire, foaming fire protection seals seal the safety cabinet in the area of the door joints. Design specifications for the rear and side walls of the safety cabinet as well as the introduction of a bottom tray (part 1) and specifications for the safe handling of pressurized gas cylinders (part 2) are also specified in the standard.
The standard also regulates the tests to be carried out for the approval of safety cabinets for storing flammable liquids (Part 1) and safety cabinets for pressurized gas cylinders (Part 2).
The standard includes four different types of safety cabinets:
- Type 15, 30, 60, 90 - safety cabinets for flammable liquids
- Type G15, G30, G60, G90 - safety cabinets for pressurized gas cylinders
The number in the type of the safety cabinet represents the fire resistance in minutes. During this period, no increase in temperature of more than 180 Kelvin is permitted in the interior of the cabinet (Part 1 “Safety cabinets for flammable liquids”). In pressurized gas cylinder cabinets (Part 2 “Safety cabinets for pressurized gas cylinders”), the temperature rise over the entire test period must not exceed 50 Kelvin on the surface of the cylinder valve holder.
Fire chamber tests
The fire resistance class is determined by fire chamber tests - these tests are carried out by independent test institutes. In the standard, the exact procedure of the tests, such as B. the arrangement and installation of the test equipment, the position of the cabinet, as well as the aspects that must be included in the final test report are defined.
In the fire chamber test, the front of the cabinet, the side walls and the ceiling are heated with flames in accordance with the standard temperature-time curve ( EN 1363-1). As the temperature rises, the temperature is continuously recorded at various measuring points in the cabinet. The fire chamber is set up in such a way that the doors, walls and the roof of the tested cabinet experience the same heat conditions, but without the flames directly touching the cabinet body.
If there are different sizes of a cabinet model, each size must be tested individually; only small changes may be made without re-examination.
Web links
- Table of contents of DIN EN 14470-1: 2004-07 at Beuth-Verlag
- Table of contents of DIN EN 14470-2: 20061-11 at Beuth-Verlag (English)
Individual evidence
- ↑ New standard for pressurized gas cylinder cabinets - EN 14470-2 , chemistry specialist portal
- ↑ Safety cabinets according to EN 14470-1 ( Memento of September 26, 2005 in the Internet Archive ), Bavarian Fire Brigade Association , February 2005
- ↑ Risk minimization according to standards - the European regulations for safety cabinets for the storage of flammable liquids and pressurized gas cylinders , GIT Labor-Fachzeitschrift 06/2011, p. 166–167 (PDF file, 184 kB)