BS ISO 3087:2020 pdf download
BS ISO 3087:2020 pdf download.Iron ores – Determination of themoisture content of a lot.
B.1 General
B.1.1 In many countries, strict environmental regulations must be observed In the Iron ore and steel industry When water is sprinkled over iron ore during loading and/or unloading operations to prevent dust evolution, the moisture content of a lot shall be corrected, in accordance with the procedure specified in this annex. for the mass of water sprinkled.
This annex also describes a method for correcting the moisture content cia lot containing rainwater.
B.1.2 Water is sprinkled icr the following reasons:
a) environmental regulations at loading and/or unloading ports;
b) difficulty of handling iron ores due to ore characteristics, weather conditions, handling equipment, etc.
B.1.3 Correction for rainwater shall be made whenever rainfall occurs during the loading or unloading operations, and the moisture content of the lot is known to have been affected.
B.Z Corrections for sprinkled water
B.2.1 General
In the case of unloading a lot, sprinkled water refers to water sprinkled (or sprayed) In the vessel holds and/or on any sections extending to a point where samples are taken. In the case of loading eta lot, sprinkled water refers to water sprinkled in the holds and/or on the loading conveyers located after the point where moisture samples are taken.
l’wo methods of correction for sprinkled water are mentioned In this subclause. One refers to water added before the sampling point during unloading operations, the other to water added after the sampling point during loading operations.
B.2.2 Measurement of sprinkled water
The measurement of sprinkled water shall be made with a volumenometer having an accuracy of ±5%. The volume obtained shall be converted to a mass, to3, in tonnes. by multiplying it by the density of the sprinkled water.
NOTE Fresh water is asstimetl to have a density of 11/rn3.
B.2.3 Mass of lot
The mass of the lot, m4, In tonnes, as received or as despatched without sprinkled water or rainwater, or the mass of the lot, m5. in tonnes as received or as despatched containing sprinkled water or rainwater,
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 vessels hold(s), and/or onto the handling equipment during both loading and unloading operations.
Two methods of correction for rainwater are mentioned in this suhclause. 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) liatches: Thi’ 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.
