ISO 3087:2011 pdf free download – lron ores一Determination of the moisture content of a lot.
B.2.5 Calculation of moisture content corrected for sprinkled water added during loading operations after taking moisture samples
The moisture content of the lot, it’s, expressed as a mass fraction (%), corrected for sprinkled water, is given by Equation (B.2) and reported to the first decimal place.
1113 is the mass, in tonnes, of sprinkled water;
1115 is the mass, in tonnes, of the lot containing sprinkled water, as determined in B.2.3;
f refer to the note in B.2.4.
B.3 Corrections for rainwater
B.3.1 General
The moisture content of the lot shall be determined from the as-tested moisture content by allowing for the influx of rainwater into the vessel’s hold(s), and/or onto the handling equipment during both loading and unloading operations.
Two methods of correction for rainwater are mentioned in this clause. One refers to rainwater influx before the sampling point during unloading operations, the other to rainwater influx after the sampling point during loading operations.
B.3.2 Effective area caught in the rain
The effective area exposed to the rain shall be calculated by summation of the areas specified below, rounded to the nearest square metre.
a) Hatch(es) The open area, in square metres, of the hatch(es) through which the lot is exposed to the rain shall be calculated on the basis of the drawings provided on board the carrying vessel.
b) Surge hopper(s) The open area, in square metres, of the hopper(s) used during handling the lot and exposed to the rain shall be calculated on the basis of drawings of the hopper(s).
c) Belt conveyor(s) The open area, in square metres, of the belt conveyor(s) shall be calculated by multiplying the effective belt width by the length exposed to the rain during transportation of the lot between the vessel and the point where moisture samples are taken.
B.3.3 Duration of rainy periods
The duration of rainy periods shall be determined from the time of the opening of the hatches to completion of sampling.
B.3.4 Amount of rainwater
The amount of rainwater shall be determined by means of an approved rain gauge placed close to the loading or the unloading port. The amount of rainwater shall be measured to the nearest millimetre.
Four examples of test reports are shown in Tables Dl, D.2, D.3 and D.4. Table D.l is a test report for moisture measurement on a test portion. Table D.2 is mainly used for the calculation of the moisture content of a lot from partial samples obtained by mass-basis sampling, while Table D.3 is used for time-basis sampling. Table D.4 is a test report for determination of the moisture content of a lot on four test portions taken from the gross sample.