Transportable Moisture Limit Testing

Transportable Moisture Limit Testing

The transportation or transportable moisture limit is defined as:

It is the limit of a cargo which may liquefy, represents the maximum moisture content of the cargo, which is considered safe for the carriage in ships not complying with the special provision. It is derived from the flow moisture point (flow table test) or from data obtained from other test methods approved by the appropriate authority of the port state as being reliable.

The transportable moisture limit (TML) = 90% of FMP. If the FMP and the MC is known, the TML can be calculated by the ship command.

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The IMSBC Code requires that the shipper shall provide the master with a certification to confirm the TML and the actual moisture content of the cargo prior loading. The cargo cannot be assumed as safe for the transportation if the moisture content is not less than the transportable moisture limit (IMSBC code, section 7.3.1). If the moisture content is equal to the TML or is exceeding the TML, the cargo must be declared as unsafe. The certification presented to the master should not be older than seven days. If the certificate is older than seven days, the test for the moisture content of the cargo must be renewed and the cargo can only be loaded if the new certificate, approved by the authorities, states that the moisture content is below the TML.



transportable moisture limit calculations example

Flow Table

tml transportable moisture limit testing flow table (1)

transportable moisture limit testingtransportable moisture limit test equipment

Penetration Test

transportable moisture limit tml-penetration-test (1)
transportable moisture limit tml-penetration-test (1)
transportable moisture limit tml-penetration-test (3)transportable moisture limit tml-penetration-test (2)

The penetration test is generally suitable for mineral concentrates, similar materials, and coals up to a top size of 25 mm.
In this procedure, the sample, in a cylindrical vessel, is subjected to vertical vibration of 2 grams + 10% (g = gravity acceleration) for 6 minutes.
When the penetration depth of a bit put on the surface exceeds 50 mm, it is judged that the sample contains a moisture greater than the flow moisture point.
This procedure consists of a preliminary test to get an approximate value of the flow moisture point and a main test to determine the accurate flow moisture point.
When the approximate value of the flow moisture point is known, the preliminary test can be omitted.
We have fitted our vibration table according to this norm with the ability to produce a constant 2 grams + 10%. There is a large or small vessel available in combination with a 88 or 177 grams bit according to the norm.

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