Discussion on low-temperature brittle fracture of seamless steel pipes

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Hello everyone. The material used for the pipelines in our facility to transport low-temperature propane is A671 Gr CC60 CL22 EFW 12MM ASME B36.10M. In other words, it refers to carbon steel pipes of type (A671) that are welded by electrofusion (EFW), with a wall thickness of 12MM as specified in the standards set by the American Society of Mechanical Engineers (ASME) – B36.10M. These pipes have undergone stress-relief treatment (CL22). The propane flowing through these pipes is at a low temperature of around -40°C under normal operating conditions; during summer operations, it is necessary to pre-cool the pipelines. The maximum ambient temperature in this area is 37°C. So, are there any requirements regarding pre-cooling for this type of steel pipe? For example, in an extreme scenario where the temperature drops suddenly from its highest value to its lowest value, with a temperature difference of over 70 degrees, could this cause the pipes to become brittle? Are there specific standards and regulations to prevent brittle fracture?