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The Weighing Equipment (Automatic Rail-weighbridges) Regulations 2003

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regulation 9(3)

SCHEDULE 6E+W+S(Prescribed limits of error)

The maximum permissible errors for weighing-in-motion shall be as specified in Table 1.

Table 1

Accuracy classPercentage of mass of single wagon or total train, as appropriate
Initial verificationIn-service
0.2±0.10%±0.2%
0.5±0.25%±0.5%
1±0.50%±1.0%
2±1.00%±2.0%

On initial verification of an automatic rail-weighbridge weighing coupled wagons, the errors of not more than 10% of the weighing results taken from one or more passes of the test train may exceed the appropriate maximum permissible error given in Table 1 but shall not exceed two times that value.

Application of maximum permissible errors (weighing-in-motion)E+W+S

Wagon weighing (Clause 2.8.2.1 of Part 1 of OIML R 106)

The maximum permissible error for coupled or uncoupled wagon weighing, shall be one of the following values, whichever is greater:

  • • the value calculated according to Table 1, rounded to the nearest scale interval;

  • • the value calculated according to Table 1, rounded to the nearest scale interval for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings), or

  • • 1 d.

Train weighing (Clause 2.8.2.2 of Part 1 of OIML R 106)

The maximum permissible error for train weighing shall be one of the following values, whichever is greater:

  • • the value calculated according to Table 1, rounded to the nearest scale interval;

  • • the value calculated according to Table 1, for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings) multiplied by the number of reference wagons in the train (not exceeding 10 wagons) and rounded to the nearest scale interval, or

  • • 1 d for each wagon in the train but not exceeding 10 d.

The maximum permissible errors on static weighing for increasing or decreasing loads shall be the appropriate values in Table 2.

Table 2

Maximum permissible errorsLoad (m) expressed in numbers of scale intervals
±0.5d0 �?� m �?� 500
±1.0d500 < m �?� 2 000
±1.5d2 000 < m �?� 10 000

Scale interval (d) (Clause 2.3 of Part 1 of OIML R 106)E+W+S

For a particular method of weighing-in-motion and combination of load receptors, all weight indicating and printing devices on an automatic rail-weighbridge shall have the same scale interval.

The relationship between the accuracy class, the scale interval and the maximum wagon weight divided by the scale interval shall be as specified in Table 3.

Table 3

Accuracy classD (kg)(maximum wagon weight)/d
minimummaximum
0.2�?� 501 0005 000
0.5�?� 1005002 500
1�?� 2002501 250
2�?� 500100600

The scale intervals of the indicating or printing devices shall be in the form of 1 × 10k, 2 × 10k or 5 × 10k, “k” being a positive or a negative whole number or zero.

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