The operational equipment of bulk containers designed to be emptied by tilting shall be capable of
withstanding the total filling mass in the tilted orientation.
Any movable roof or side or end wall or roof section shall be fitted with locking devices with securing
devices designed to show the locked state to an observer at ground level.
Filling and discharge devices shall be so constructed and arranged as to be protected against the risk
of being wrenched off or damaged during carriage and handling. The filling and discharge devices
shall be capable of being secured against unintended opening. The open and closed position and
direction of closure shall be clearly indicated.
Seals of openings shall be so arranged as to avoid any damage by the operation, filling and emptying
of the bulk container.
Where ventilation is required bulk containers shall be equipped with means of air exchange, either by
natural convection, e.g. by openings, or active elements, e.g. fans. The ventilation shall be designed to
prevent negative pressures in the container at all times. Ventilating elements of bulk containers for the
carriage of flammable substances or substances emitting flammable gases or vapours shall be
designed so as not to be a source of ignition.
Inspection and testing
Containers used, maintained and qualified as bulk containers in accordance with the requirements of
this section shall be tested and approved in accordance with the CSC.
Containers used and qualified as bulk containers shall be inspected periodically according to the CSC.
Containers used as bulk containers shall be marked with a Safety Approval Plate in accordance with
Requirements for the design, construction and approval of BK1 or BK2 bulk containers other than containers conforming to the CSC
NOTE: When containers conforming to the provisions of this section are used for the carriage of
solids in bulk, the following statement shall be shown on the transport document:
"Bulk container BK(x) approved by the competent authority of ……". (see 22.214.171.124.17)".
Bulk containers covered in this section include skips, offshore bulk containers, bulk bins, swap bodies,
trough shaped containers, roller containers, and load compartments of vehicles.
NOTE: These bulk containers also include containers conforming to the UIC leaflets 591, 592 and
592-2 to 592-4 as mentioned in 7.1.3 which do not conform to the CSC.
These bulk containers shall be designed and constructed so as to be strong enough to withstand the
shocks and loadings normally encountered during carriage including, as applicable, transhipment
between modes of transport.