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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.
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 to loading. The cargo cannot be assumed as safe for 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 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.
Description
For the test setup of the TML test, it is important that every test is performed in the same way. Every manual operation can make a difference between operators and thus influence the test results. When there is a difference in pressing (the sample) due to force difference, a difference can / will also arise through the manual operation of the table.
The speed at which the table will be raised may differ, each operator has his own turning speed and the interval between turning will be different.
We, therefore, advise against working with a manual tamper and a non-powered table. The differences due to manual action causes (non-intentional) too many variations/biases in the results which can lead to claims as the results can’t be reproduced.
From experience, we also see “automated” tables based on a simple motor that is set with a rotary knob offered by competitors.
Where this might be seen as a cheap alternative, the chance of 1 click/turn is more or less still considerable. These motors do not have a counter to keep track of how often the table has “fallen”, causing an operator to lose count and the test to have a deviation.
This cheap solution is still prone to variations/biases as the technology used isn’t 100% fail-proof.
On our engine, you will see a touch screen where the number of rpm can be set and the number of “drops”. These parameters can be seen on the screen, even when they have been entered.
This means the parameters are always visible before the machine starts working.
Flow Table
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Penetration Test
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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.
General Description
The transportable moisture limit flow table test is a method to determine the amount of cargo that is safe for transportation.
The sample is placed in a mould and tamped to replicate the amount of pressure during transportation. The mould is then removed and the tamped material is subjected to physical forces to determine the deformation.
Technical Features
The housing is made of steel plate varnished with powder coating RAL 5005.
Technical Data
Power supply | 220V ± 10% – 50/60Hz |
Weight | App. 38 kgs |
| Noise emission | ±80 dB(A) |
Ambient temperature | 5°C – 40°C |
| Atmospheric humidity | < 85% RH |
Installation
Before the installation, carefully examine the delivery for possible damage or missing parts. Open the box and take the machine out of the box. Check that the machine has not been visibly damaged during the transport.
Please keep the packing material for the duration of the guarantee period. In case of a complaint and return of the machine in unsuitable packing material, your guarantee claim will be lost.
Check that the main cord is compatible with the local standard, or connect a local plug to the machine.
If any kind of damage occurred during transport, immediately make a complaint to the carrier. Any incorrect delivery or missing parts should be reported to the dealer.
Selecting the Right Place
When selecting the right place for the machine, please consider the following:
– Put the device on a smooth and stable surface.
– Leave enough space beyond the device.
– Leave enough space around the device, that you will easily control and maintain it.
– Don’t use the device in surroundings, where there are fast temperature and humidity changes. Also, avoid places exposed to direct sunlight and places nearby heating devices.
– Avoid places, where the possibility of shocks and vibrations exists.
Note: The machine should not be placed so, that it is difficult to pull out the cord plug from the mains power supply.