AN INTRODUCTION TO PETROLEUM REFINING AND THE PRODUCTION OF ULTRA LOW SULFUR GASOLINE AND DIESEL FUEL the crude oil, the higher its C/H ratio. Due to the chemistry of oil refining, the higher the C/H ratio of a crude oil, the more intense and costly the refinery processing required to prod uce given volumes of gasoline and distillate fuels An introduction to oil and gas production, transport, refining and petrochemical industry Håvard Devold. 2 characteristics and design issues. I have had many requests that downstream processes be included, and have restructured the book into Upstream, Midstream, Refining and The use of chemicals for oil and gas production operations shall comply fully with the requirements of the national environmental guidelines and standards for the petroleum industry Refining Regulations, 1974 and Petroleum Regulations 1969 as amended, any 2.0 DETAILED ENGINEERING DESIGN/APPROVAL TO CONSTRUCT A GAS PLANT FACILTY