The Impact of the Structure of the Sampler on the Representativeness of LPG Samples

摘要

This research paper describes the results of a research project on how the structure of the sampler for assembling and storage of LPG samples influences the representativeness of samples under study. The representativeness of the sample was compared to the quality parameters of the study sample for the given part of the cargo from which it was taken. This article refers to the traditional solution of the non-dismantable sampler and to the dismantable sampler applied as a new solution. This research describes the results of a research project on how the structure of the sampler for assembling and storage of LPG samples influences the representativeness of samples under study. The research was carried out in two directions: analysis of gas samples for the current PN-EN 589, PN-EN ISO 4257 standards and analysis of microscopic and macroscopic inner surface of the sampler. It was observed the formation of contamination layers in samplers. The chemical composition of the layers was examined and identified possible impact on changing the quality parameters of LPG. Based on the conducted research and analysis, the impact of the changed structure on the quality parameters of the LPG fuel and its representativeness in reference to the part of the cargo from which it had been taken can be assessed. Allow to conclude the thesis that the structure of the dismantable sampler followed internal cylinder surface treatment affects the representativeness of the samples collected and analyzed type of LPG gas. The construction of the sampler and possible of cleaning sampler is particularly important for qualitative parameters such gases as corrosive to copper and sulfur content of the total. Impurities that may be present in LPG, derived from refinery and petrochemical processes (ammonia, water, sulfur, methanol, higher hydrocarbons, dirt) and the distribution system are causing the occurrence of secondary reactions. Results occurring secondary reactions adversely affect the quality of the LPG. The researched solution on the dismantled sampler was patented, implemented, and applied in practice. The possibility to dismantle and thoroughly clean the sampler prior to sample collection enhances the certainty of obtaining highly representative samples and credible test results.