Abstract:
Quality control chart is statistical tool to control production process
according to specific specification . It also used to know defects and
unneeded deviations in performance to know deviation causes and then
make a decisions to ensure continuous improve. The research problem is the
decline in the quality of petroleum products and its bad effect in human
health and the environment .the fuel contains sulfur which increase
pollution. The study aimed to evaluate petroleum products quality (diesel &
gas oil ) in Khartoum refinery using statistical control chart. The main
hypotheses is using statistical control method in petroleum products quality
more effective to know changes in production process compared to the
current system . The study followed the statistical approach by takingfrequent samples from products and prepare quality control chart for mean
using (X- bar , R- bar ( و )X-bar , S) . The result shows that the diesel
quality in Khartoum refinery does not meet the specification by test diesel
density and flash point . But the cetena number for diesel meet the
specification. The statistical control tests show that the Gas Oil density does
not , meet the specification . The study recommends using statistical control
chart to control petroleum product quality in Khartoum refinery for its
usability and accuracy in production decision making process Also it
recommends training for people who work in refinery quality control to use
statistical control chart and continuously update petroleum products
specification limits to meet international development.
TheThe researcher recommend a study in title the use of 6 Sigma to control
the quality of petroleum products to be an extension for this study.
