In a flowline/riser system, large liquid slugs and gas surges can e formed by operational changes, flow conditions, and physical characteristics of the flow-line. These liquid slugs and gas surges can result in large oil- and gas-production losses when they arrived at a production platform. Slugging may cause high-level trips in separators and lead to unstable operation of topside facilities. A new slug-suppression system (SSS) uses a small separator with dynamically controlled valves at the gas and liquid outlets upstream of the production separator.