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하각현(GAK-HYEON HA),정일석(ILL-SEOK JEONG),김상복(SANG-BOK KIM) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The revision of ANSI/HPS N13.1-1999 differs significantly from the ANSI/HPS N13.1-1969 in that it is now a performance-based standard rather than one based on prescriptive rules. There are two important aspects of performance addressed in the new approach. First, the concept of acquiring a representative sample is not based on rules for sample location and multi-point extraction, but rather on the premise that at any location where the contaminant concentration and fluid momentum can both be demonstrated to meet numerical criteria for acceptable mixing, a representative sample can be obtained by extraction from a single point in that profile. Second, numerical criteria are also used to provide the basis for a decision on whether a sampling system will deliver a representative sample to collector or detector. Essentially the concept of isokinetic sampling has been replaced by numerical criteria for the sampling performance of extraction nozzle and transport line designs.