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Proper sampling is critical when determining the value of a cargo. Risk associated with inaccurate evaluation of cargo is managed by selecting the proper Mechanical Sampling System. By installing, operating, and properly maintaining the Mechanical Sampling System and verifying its ongoing performance, a Mechanical Sampling System will give accurate data.
Mechanical Sampling is preferred over manual sampling because there is no human discretion involved, thus minimizing bias. The Mechanical Sampling System is more expensive to purchase, install, and maintain, but its increased accuracy and precision are well worth the cost, especially if large amounts of coal are handled annually.
Mechanical Sampling Systems must be properly designed and should be performance (bias) tested and be subject to an ongoing quality assurance program. This should include periodic critical inspections (audits) and maintenance of statistical process control charting to monitor and to control its operational performance.
SGS Services for New Mechanical Sampling Services
To design an effective Mechanical Sampling System, detailed information about the location of the Mechanical Sampling System and the material to be sampled is needed (including its top size, surface moisture content and material handling characteristics). A site visit is often required to ensure your Mechanical Sampling System design meets the design criteria defined by ASTM, ISO or other specific specifications. General points that SGS considers when designing an Mechanical Sampling System are:
- Cutter widths should be at least 2.5 times (3 times is preferred) the top size of the material
- Chutes should have angles that promote material flow
- There should be no choke points in the conveyors and chutes
- The Mechanical Sampling System should be as compact as possible, but be maintained easily and safely
- The Mechanical Sampling System should be as airtight as possible to prevent drafting. This will prevent moisture bias
- The Mechanical Sampling System should have access doors to observe the system’s performance. These allow verification that the cutters are cutting the entire stream material, are moving at an appropriate speed and are not plugged
- Reliability, expense, and practical operational considerations must be optimized
SGS has 25 years experience designing, installing and commissioning client-dedicated, site-specific Mechanical Sampling Systems. There are 300 SGS-designed systems operating in more than 20 countries worldwide and SGS can design a reliable, bias-free Mechanical Sampling System for your operation as well. Experienced SGS sampling technicians, familiar with industry standards related to proper operation of Mechanical Sampling Systems, are located in all major coal producing areas.
SGS Services for Existing Mechanical Sampling Systems
SGS can provide the following services for your Mechanical Sampling System:
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