Engineering Services for Mechanical Sampling （工程服务为机械抽样）.pdfVIP

SGS MINERALS SERVICES – T3 SGS 558 10-2013 ENGINEERING SERVICES FOR MECHANICAL SAMPLING SYSTEMS Mechanical sampling systems are If desired, when the precision for a critical part of the coal quality a design system is unknown, these determination system at mines, ports, standards provide factors for raw data. terminals, power plants and coke In addition, these standards allow for batteries. Systems must be designed, studying the variability of the coal. Then sited and operated, so as to produce using the data to calculate the number unbiased samples with industry standard of increments needed to attain a given precision. Sampling systems are often precision. As clients become more purchased and installed using competitive informed about the need to meet specific bidding. The key to effective competitive precision requirements, they are more bidding is sufficient technical description willing to determine the variability of the of the system so that the bids are all on material and designing systems to meet the same basis. specific minimum precision requirements. There are four key components in Using a proven procedure, SGS can ASTM and ISO recommend that the engineering mechanical sampling determine the number of primary systems be designed so that the sampling systems which include: increments and sub-lots needed to system precision can be tested. These • Defining the sample plan obtain objective levels of precision. This are your decisions, but they can have • Establishing a systems layout entails use of applied st