BS EN 61340-4-4:2012+A1:2015

This part of IEC61340 specifies requirements for flexible intermediate bulk containers (FIBC) between 0,25m 3 and 3m 3 in volume, intended for use in hazardous explosive atmospheres. The explosive atmosphere may be created by the contents in the FIBC or may exist outside the FIBC. The requirements include: classification and labelling of FIBC; classification of inner liners; specification of test methods for each type of FIBC and inner liner; design and performance requirements for FIBC and inner liners; safe use of FIBC (including those with inner liners) within different zones defined for explosion endangered environments, described for areas where combustible dusts are, or may be, present ( IEC60079‑10‑2 ), and for explosive gas atmospheres ( IEC60079‑10‑1 ); procedures for type qualification and certification of FIBC, including the safe use of inner liners. NOTE1 Guidance on test methods that may be used for manufacturing quality control is given in AnnexC. The requirements of this standard are applicable to all types of FIBC and inner liners, tested as manufactured, prior to use and intended for use in hazardous explosive atmospheres: Zones 1 and 2 (Groups IIA and IIB only) and Zones 21 and 22 (see AnnexD for classification of hazardous areas and explosion groups). For some types of FIBC, the requirements of this standard apply only to use in hazardous explosive atmospheres with minimum ignition energy of 0,14mJ or greater and where charging currents do not exceed 3,0µA. NOTE2 0,14mJ is the minimum ignition energy of a typical Group IIB gas or vapour. Although more sensitive materials exist, 0,14mJ is the lowest minimum ignition energy of any material that is likely to be present when FIBC are emptied. 3,0µA is the highest charging current likely to be found in common industrial processes. This combination of minimum ignition energy and charging current represents the most severe conditions that might be expected in practice. Compliance with the requirements specified in this standard does not necessarily ensure that hazardous electrostatic discharges, e.g. cone discharges, will not be generated by the contents in FIBC. Information on the risks associated with cone discharges is given in AnnexE. Compliance with the requirements of this standard does not mitigate the need for full risk assessment. For example, metal and other conductive powders and toner powders may require additional precautions to prevent hazardous discharges from the powders. NOTE3 In the examples mentioned in the paragraph above, additional precautions may be necessary in the case of metal or other conductive powder because if the powder is isolated and becomes charged, incendiary sparks may occur, and in the case of toner powders, incendiary discharges may occur during rapid filling and emptying operations. IEC/TSTS60079‑32‑1 [1] 1 gives guidance on additional precautions that may be necessary. Test methods included in this standard may be used in association with other performance requirements, for example when a risk assessment has shown the minimum ignition energy of concern is less than 0,14mJ, charging currents are greater than 3,0µA, or the ambient conditions are outside of the range specified in this standard. Compliance with the requirements specified in this standard does not necessarily ensure that electric shocks to personnel will not occur from FIBC during normal use.