Type testing

A representative prototype tank shall be subjected to tests as specified below. For this purpose service
equipment may be replaced by other items if necessary.

The prototype shall be inspected for compliance with the design type specification. This shall include
an internal and external visual inspection and measurement of the main dimensions.

The prototype, equipped with strain gauges at all locations where a comparison with the design
calculation is required, shall be subjected to the following loads and the strains shall be recorded:
- Filled with water to the maximum filling degree. The measuring results shall be used to
calibrate the design calculation according to 6.9.2.5;
- Filled with water to the maximum filling degree and subjected to accelerations in all three
directions by means of driving and braking exercises with the prototype attached to a vehicle.
For comparison with the design calculation according to 6.9.2.6 the strains recorded shall be
extrapolated in relation to the quotient of the accelerations required in 6.8.2.1.2 and measured;
- Filled with water and subjected to the specified test pressure. Under this load, the shell shall
exhibit no visual damage or leakage.

The prototype shall be subjected to the ball drop test according to EN 976-1:1997, No. 6.6. No visible
damage inside or outside the tank shall occur.

The prototype with its service and structural equipment in place and filled to 80% of its maximum
capacity with water, shall be exposed to a full engulfment in fire for 30 minutes, caused by an open
heating oil pool fire or any other type of fire with the same effect. The dimensions of the pool shall
exceed those of the tank by at least 50 cm to each side and the distance between fuel level and tank
shall be between 50 cm and 80 cm. The rest of the tank below liquid level, including openings and
closures, shall remain leakproof except for drips.

Type approval

The competent authority or a body designated by that authority shall issue in respect of each new type
of tank an approval attesting that the design is suitable for the purpose for which it is intended and
meets the construction and equipment requirements of this chapter as well as the special provisions
applicable to the substances to be carried.

The approval shall be based on the calculation and the test report, including all material and prototype
test results and its comparison with the design calculation, and shall refer to the design type
specification and the quality assurance programme.

The approval shall include the substances or group of substances for which compatibility with the
shell is provided. Their chemical names or the corresponding collective entry (see 2.1.1.2), and their
class and classification code shall be indicated.

In addition, it shall include design and threshold values (such as life-time, service temperature range,
working and test pressures, material data) specified and all precautions to be taken for the
manufacture, testing, type approval, marking and use of any tank, manufactured in accordance with
the approved design type.

Inspections

For every tank, manufactured in conformity with the approved design, material tests and inspections
shall be performed as specified below.

The material tests according to 6.9.4.2.2, except for the tensile test and for a reduction of the testing
time for the bending creep test to 100 hours shall be performed with samples taken from the shell.
Samples manufactured in parallel may only be used, if no cutouts from the shell are possible. The
approved design values shall be met.

Shells and their equipment shall either together or separately undergo an initial inspection before
being put into service. This inspection shall include:
- a check of conformity to the approved design;
- a check of the design characteristics;
- an internal and external examination;
- a hydraulic pressure test at the test pressure indicated on the plate prescribed in 6.8.2.5.1;
- a check of operation of the equipment;
- a leakproofness test, if the shell and its equipment have been pressure tested separately.

 

For the periodic inspection of tanks the requirements of 6.8.2.4.2 to 6.8.2.4.4 shall apply. In addition,
the inspection in accordance with 6.8.2.4.3 shall include an examination of the internal condition of
the shell.
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