A　340　kW　ORC　system　was　designed　and　tested　for　a　Low　Pressure　Saturated　Steam　(LPSS)　heat　source　which　is　an　abundant　industrial　waste　heat.　The　thermal　design　considered　four　working　fluids　with　R245fa　ultimately　selected　for　its　high　thermal　efficiency.　Many　thermal　simulation　conclusions　from　previous　researches　were　evaluated　but　found　to　be　improper　for　the　present　design.　Then,　the　main　system　components,　including　a　radial　turbine,　two　shell　and　tube　heat　exchangers,　and　a　shield　pump　were　designed　with　other　matching　components　selected　based　on　the　thermal　design.　The　effects　of　the　system　operating　parameters,　including　the　evaporating　temperature,　condensing　temperature,　super　heating　and　subcooling　were　analyzed　with　the　results　showing　that　the　thermal　optimization　must　consider　the　effects　of　the　operating　conditions　on　the　component　safeties　and　efficiencies.　Finally,　the　system　was　constructed　and　tested　near　the　design　condition　with　the　results　showing　that　the　maximum　generator　output　power　was　302　kW　with　a　thermal　efficiency　of　9.7%.　For　these　conditions,　the　isentropic　turbine　efficiency　was　80.7%　at　10,389　RPM.　Suggestions　for　LPSS-ORC　system　designs　are　given　to　improve　the　system　safety　and　component　design.　©　2020　Elsevier　Ltd