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It means the temperature which a substance may reach normally in the process of using it, and a temperature of a substance in an abnormal condition due to wrong operation is not referred to as normal operating temperature. Normal operating temperature generally varies within a range. When it is necessary to fix normal operating temperature, in many cases, normal operating temperature is fixed at a safer temperature in view of the purpose of the regulations. For example, in the case of setting the design pressure of a container, a standard for normal operating pressure should be set for the pressure at the highest normal operating temperature; and in the case of selecting materials for Designated Equipment used at an extremely low temperature, the lowest normal operating temperature should be selected.