A liquid sample of LPG is transferred from the source into a sample container by purging the container and filling it with liquid, then providing a minimum 20 percent outage by venting liquid, so that 80 percent or less of the liquid volume remains. Samples of liquefied petroleum gases are examined by various test methods to determine physical and chemical characteristics. Analytic result may be used for quantity calculation, transportation, preservation of LPG and product assessment. Therefore, the method of taking LPG sample in order to examine is very important and can't make a mistake.