But this book proposes a cryogenic temperature range of 50°C to 196°C, based on the British Standard (BS 6364) for cryogenic services. Another cryogenic valve standard, Manufacturers Standardization Society of Valve and Fitting MSS SP 134, sets the range at 100°C to 255°C.Thus, cryogenic temperature ranges vary from one standard to another and from one project to another. Temperatures between 29°C and 46°C are considered merely low temperatures.Fig. 2.2 summarizes the process of LNG extraction from natural gas at cryogenic temperatures.