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CONTACT USCoal buyers and sellers rely on ALS to deliver timely, accurate shipping certificates that describe the quality and quantity of individual coal export shipments. During coal loading at the export terminal, ALS personnel use automatic sample plants to obtain representative samples of coal. These samples are sized and analysed at the laboratory. The results then undergoing a rigorous validation process that ensures that the certificate truly reflects the characteristics of the coal shipment.
ALS has developed a world-leading automated certification platform that directly processes instrument data into certificates. Both coal sellers and buyers can be assured that the system delivers a true representation of the shipment.
Contact us for a demonstration of the certification system.
CONTACT USALS certifies the quality and quantity of coal that is loaded onto a vessel at a coal terminal. The delivery of this service is required to be both timely and accurate while the processes required to deliver the service are complex (as described below).
Superintending laboratories, like ALS, receive nominations from coal sellers to sample and analyze a shipment of coal. The coal seller provides documentation on the types of certificates required, the wording on certificates, the analyses that are required for that cargo, and the provisional date of loading. Once the instruction has been received, ALS prepares all the required documentation and begins to track the ship's arrival time.
During berthing, ALS sends inducted, trained, and competent sampling staff to the sample plant at the terminal. Some sample plants require the staff to have an MSIC (Maritime Security Identification Card). The sampling staff configure the automatic sampling system to obtain the required number of cuts and sub-lots to achieve an accurate representative sample. The mechanical sampling system typically comprises a falling stream cutter, various crushing units, and sample collection bins. Two types of samples are produced by the automatic sampling system:
Note that sub-lot sampling is performed to minimize the statistical errors associated with sampling. The largest statistical errors associated with an analytical result are due to sampling. By analysing each sub-lot separately and then weighting the analysis based on the mass of the sub-lots, the precision of analysis is improved.
The Physical and Chemical samples are processed separately.
The Physical Sample is sized through a set of calibrated screens. There may be contract penalties for >50 mm coal and for < 2mm coal (or other smaller size gates).
Each Chemical (sub-lots) Sample is weighed. It is then crushed to –4.75 mm and various sub-samples at cut out of the Chemical Sample using a rotary sample divider. These sub-samples include:
The secure automated certification platform comprises three components:
The ALS Superintending laboratories are accredited against ISO 17025 “General requirements for the competence of testing and calibration laboratories” by the National Association of Testing Authorities (NATA).
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