Collection of samples from loaded wagons (Rail and MGR. Rake-wise, grade-wise and consumer-wise coal supplied from one Delivery Point shall be considered as one lot, in case of supplies by rail.
Collection of samples from loaded wagons (Rail and MGR. (a) Rake-wise, grade-wise and consumer-wise coal supplied from one Delivery Point shall be considered as one lot, in case of supplies by rail.
(b) In case of Coal dispatches through MGR the sample collected from each rake (source wise, grade wise and Consumer wise) loaded from the respective Delivery Point during the day shall be pooled together to form a gross sample for the day.
(c) Each Rake shall be divided into a no. of sub-lots in a manner that the quantity of Coal / number of wagons in such sub-lots is more or less equal. One sample shall be collected from each sub- lot. The number of sub-lots shall be determined as under: Up to 30 wagons 4 >30 wagons up to 50 wagons 5 >50 wagons and above 6
(d) Each sub-lot consists of one (1) wagon selected as per random table given in IS:436 (Part I/Section I) 1964 for collection of sample/ increments.
(e) In each wagon selected for sampling, the sample shall be drawn from one spot in such a manner so that if in the first randomly selected wagon, the sample is collected at one end, in the next random wagon the sampling spot will be in the middle of the wagon and in the third random wagon, the sampling spot will be at the other end and this sampling procedure shall be repeated for all subsequent random wagons.
(f) Before collecting the samples, the sampling spot will be leveled and at least 25 cm of Coal from the surface shall be removed / scrapped and the place will be leveled for an area of 50 cm by 50 cm.
(g) About 50 kg of sample shall be collected from each selected wagon in the lot by drawing 10 increments of approx. 5 kg each with the help of shovel / scoop.
(h) Any stone / shale of size more than that specified in Annexure III shall be remove/ discarded from the sample;
(i) Samples thus collected from all the selected wagons in a lot shall be mixed together to form one gross sample per lot.
(j) In case live overhead traction line exists in the siding, Third Party Agency shall ensure that the power supply in the overhead traction is essentially switched off before commencement of sample-collection process from loaded wagons.
