Method for gradual sealing of a gas

The invention relates to a method for gradual sealing of a gas in a compressor arrangement (100, 200, 300, 400) having a plurality of compression stages (I-VI), sequentially connected to each other via a main line (1), in which compression stages the gas conducted through the main line (1) is compressed from a suction-side pressure level to a pressure-side pressure level and heated from a suction-side temperature level to a pressure-side temperature level via said compression, wherein a return volume of the gas conducted through the main line (1) is extracted at least temporarily from the main line (1) downstream of one of the compression stages (V), supplied to a decompression, and supplied back into the main line (1) upstream of the same compression stage (V). According to the invention, the pressure-side pressure level of the compression stage (V), downstream of which the return volume is extracted from the main line (1), is a supercritical pressure level, the decompression of the return volume occurs to a subcritical pressure level, the return volume is supplied to the decompression to the pressure-side temperature level of the compression stage (V), downstream of which the return volume is extracted from the main line (1), and the return volume is cooled only after the decompression and before and/or after the return into the main line (1). The invention further relates to a compressor arrangement (100, 200, 300, 400).