Page 18 - Coal Quality Testing

Quality India

Sampling e. About 30 kg of the sample is next wagon the spot is in the
collected from each truck by
middle of the wagon and in the
Methodology drawing 6 increments of approx. third wagon at the other end
and this sampling procedure
5 kg each with the help of
shovel/scoop is repeated for subsequent
The step-by-step methodology of third- wagons
party sampling and analysis is as below – f. All the samples collected from
every truck in accordance with e. Before collecting the samples,
paragraph (b) above is mixed the spot is levelled and at
Sample Collection by Road
together to form a single gross least 25 cm of coal surface is
Coal is dispatched from trucks at loading sample removed/scrapped from the top
points. The collection of samples is and the place is levelled for an
carried out as per collection methodology g. Daywise single gross sample is area of 50 cm by 50 cm
stated below: formed for samples collected
round the clock from 00:00 f. About 50 kg of the sample is
a. Samples of coal are collected hours to 23:59 hours collected from each selected
at the loading point round the wagon in the rake by drawing 10
clock for the coal dispatch from increments of approx. 5 kg each
road mode Collection of samples from with the help of shovel/scoop
the Railway Siding:
b. The first sample of coal is g. Samples collected from all the
collected randomly by QCI from a. In case of dispatch by rail each selected wagons in a rake is
the first eight trucks at the rake of coal supplied to the mixed to form a gross sample.
entry point. Once a sample is purchaser from the delivery h. Item (d) to (f) is applicable
collected from the first truck as point is considered as a lot for for coal supplied in all types of
stipulated above, samples of the purpose of sampling wagons
coal are collected from every
8th truck after the truck from b. Each rake is divided into h. In case of the rake having live
which the first sample has been approximately equal sub-lots as overhead traction line, the
collected under: power supply in the overhead
traction is switched off to
c. In the event such 8th truck does No. of wagons in Number of facilitate collection of samples
not belong to the contracted the rake sub-lots from the wagons pursuant to
quantity, then the next truck Up to 30 wagons 4 points (d) to (f) above
belonging to contracted >30 wagons up to 50 wagons 5
quantity is be deemed as the >50 wagons and above 6
8th truck and a sample is
collected from such truck. The c. From each of the sub-lots, Sample
same process is repeated for one wagon is selected as per a Preparation
| Oc t ober - Dec ember 2 0 19 d. The spot at the top of the truck d. In each wagon selected for The preparation of sample is carried out
every 8th truck thereafter
random table in BIS Standards
(IS: 436 (Part I/Section I)
1964) or its latest version for
collection of increments
is levelled and at least 25 cm
as per BIS standards ((IS: 436 (part I/
of coal surface is removed/
Section I) – 1964))
scrapped from the top and the
The gross sample collected at the
sampling, the sample is drawn
place is levelled for an area of
collection point by the QCI is divided into
from the spot in a manner so
50 cm by 50 cm for collection of
two portions. One portion (one fourth of
samples
that if in one wagon the sample
18 is collected at one end, in the the gross sample) called Part-1 is used for