Manufacturers of membrane elements produce unified membrane modules, differing by configuration of membrane cartridges, operating pressures and throughput capacities. Choice of a relevant number of membrane modules and selection of a relevant equipment package provide for the required capacity of the plant.
Depending on the objective, single - stage and multistage membrane plants are available. Multistage configurations of plants are applied for gas treatment processes with recirculating flow of the permeate gas and higher output of the product gas (retentate) per plant.