7 gas and liquid separation systems, odorization systems and pulsation dampening systems for the oil, gas, chemical, petrochemical and process industries, comprising; line separators, vertical gas separators, horizontal gas separators, mist extractors, dry scrubbers, filter-separators, absolute separators, pulsation dampeners, combination dampener separators, and o-ring closures; selective catalytic reduction systems and environmental and emission control systems, comprising; ammonia flow control units, ammonia injection manifolds, ammonia injection grids, transition ducting, external and interconnection piping, catalysts, and storage tanks