The tanks shall be fitted with the following additional service equipment:
(a) The outlet of a pump/exhauster unit shall be so arranged as to ensure that any flammable or
toxic vapours are diverted to a place where they will not cause a danger;
(b) A device to prevent immediate passage of flame shall be fitted to all openings of a vacuum
pump/exhauster unit which may provide a source of ignition and which is fitted on a tank used
for the carriage of flammable wastes, or the tank shall be explosion pressure shock resistant,
which means being capable of withstanding without leakage, but allowing deformation, an
explosion resulting from the passage of the flame;
(c) Pumps which can deliver a positive pressure shall have a safety device fitted in the pipework
which can be pressurised. The safety device shall be set to discharge at a pressure not
exceeding the maximum working pressure of the tank;
(d) A stop-valve shall be fitted between the shell, or the outlet of the overfill prevention device
fitted to the shell, and the pipework connecting the shell to the pump/exhauster unit;
(e) The tank shall be fitted with a suitable pressure/vacuum manometer which shall be mounted in
a position where it can be easily read by the person operating the pump/exhauster unit. A
distinguishing line shall be marked on the scale to indicate the maximum working pressure of
the tank;
(f) The tank, or in case of compartmented tanks, every compartment, shall be equipped with a
level indicating device. Sight glasses may be used as level indicating devices provided:
(i) they form a part of the tank wall and have a resistance to the pressure comparable to that
of the tank; or they are fitted external to the tank;
(ii) the top and bottom connections to the tank are equipped with shut-off valves fixed
directly to the shell and so arranged that carriage with the valves in an open position is
prevented;
(iii) are suitable for operation at the maximum working pressure of the tank; and
(iv) are placed in a position where they will not be liable to accidental damage.

The shells of vacuum-operated waste tanks shall be fitted with a safety valve preceded by a bursting
disc.
The valve shall be capable of opening automatically at a pressure between 0.9 and 1.0 times the test
pressure of the tank to which it is fitted. The use of dead weight or counterweight valves is
prohibited.
The bursting disc shall burst at the earliest when the initial opening pressure of the valve is reached
and at the latest when this pressure reaches the test pressure of the tank to which it is fitted.
Safety devices shall be of such a type as to resist dynamic stresses, including liquid surge.
The space between the bursting disc and the safety valve shall be provided with a pressure gauge or
suitable tell-tale indicator for the detection of disc rupture, pinholing or leakage wich could cause a
malfunction of the safety valve.

Inspection

Vacuum-operated waste tanks shall be subject every three years for fixed tanks or demountable tanks
and at least every two and a half years for tank-containers and tank swap bodies to an examination of
the internal condition, in addition to the tests according to 6.8.2.4.3.

REQUIREMENTS FOR THE DESIGN, CONSTRUCTION, INSPECTION AND TESTING OF BULK CONTAINERS

(Reserved)

Application and general requirements

Bulk containers and their service and structural equipment shall be designed and constructed to
withstand, without loss of contents, the internal pressure of the contents and the stresses of normal
handling and carriage.

Where a discharge valve is fitted, it shall be capable of being made secure in the closed position and
the whole discharge system shall be suitably protected from damage. Valves having lever closures
shall be able to be secured against unintended opening and the open or closed position shall be readily
apparent.

Code for designating types of bulk container

The following table indicates the codes to be used for designating types of bulk containers:

Types of bulk containers

Code

Sheeted bulk container

BK1

Closed bulk container

BK2

Flexible bulk container

BK3

 

In order to take account of progress in science and technology, the use of alternative arrangements
which offer at least equivalent safety as provided by the requirements of this chapter may be
considered by the competent authority.

Requirements for the design, construction, inspection and testing of containers conforming to the CSC used as BK1 or BK2 bulk containers

Design and construction requirements

The general design and construction requirements of this sub-section are deemed to be met if the bulk
container complies with the requirements of ISO 1496-4:1991 "Series 1 Freight containers-
Specification and testing – Part 4: Non pressurized containers for dry bulk" and the container is
siftproof.

Containers designed and tested in accordance with ISO 1496-1:1990 "Series 1 Freight containers-
Specification and testing - Part 1: General cargo containers for general purposes" shall be equipped
with operational equipment which is, including its connection to the container, designed to strengthen
the end walls and to improve the longitudinal restraint as necessary to comply with the test
requirements of ISO 1496-4:1991 as relevant.

Bulk containers shall be siftproof. Where a liner is used to make the container siftproof it shall be
made of a suitable material. The strength of material used for, and the construction of, the liner shall
be appropriate to the capacity of the container and its intended use. Joins and closures of the liner shall
withstand pressures and impacts liable to occur under normal conditions of handling and carriage. For
ventilated bulk containers any liner shall not impair the operation of ventilating devices.
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