(With the DGR, how should we truncate. At how many decimal places?)
Q.
Please guide us how to apply the truncation of values, at how many decimal places. As an example, here we have 1.3 kg of UN1993 Flammable liquid which must be converted into Litres as it is a liquid. The density is 0.81 so we have calculated the volume by dividing 1.3 kg by density 0.81 and arrived at a volume of 1.6049382 ….L. Now how should we make our declaration. Should we declare it as 1.6 L? Or, 1.605 L? Or, 1.7 L? Kindly guide us. (30 Sep 22)
A.
Basically, it is rare that DGR suggests a “rounded down”. The basic rule is “rounded up”. Declaring as 1.6 L is an error. The volume 1.6049382 ….L is larger than 1.6 L. The most accurate figure to declare is 1.605 L. Declaration made for 1.7 L is not an error.

There are many other cases of truncation. Let me explain.

As a starter, we have the “Q” value we must calculate when we intend to forward multiple packages in one single outer packaging, I.e. All packed in one. The “Q” value must not be greater than 1.0. 1.0000001 is unacceptable because it is larger than the limit 1.0. Refer to 5.0.2.11 (g) (h) Notes: 2. where it says: The calculated “Q” value must be rounded up to the first decimal place and entered on the DGD (see 8.1.6.9.2 (g)). LQ packages have the same rules, I.e. 2.7.5.6 (e) Notes: 1.

There is a rule in UN specification package markings in 6.0.4.2.1 (d) where it says for single packagings for liquids, a number indicating relative density, rounded off to the first decimal for which the design type had been tested must be shown. Also in (e) for single packagings for liquids, the hydraulic test pressure which the package was shown to withstan, in kPa rounded down to the nearest 10 kPa.

With the Radioactive Material label there is a box where we must enter the Transport Index (10.7.3.3.3). The rule reads the Transport Index must be rounded up to one decimal place, e.g. 1.04 becomes 1.1.

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