I have a question regarding the setting pressure of the boiler steam safety valve

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Seeing such a passage **************************************************************************************** The opening of the safety valve is governed by relevant regulations; it can be opened under the following conditions. The opening pressure of the boiler superheater safety valve is defined as follows: (1) when the rated steam pressure is less than 1.27 MPa, working pressure + 0.02 MPa and working pressure + 0.04 MPa ； (2) Rated steam pressure greater than 1.27 MPa but less than 3.82 MPa, with a starting pressure that is 1.04 times and 1.06 times the operating pressure ； (3) When the rated steam pressure is greater than 3.82 MPa, the opening pressure is 1.05 times the operating pressure and 1.08 times that pressure. The opening pressure of the economizer safety valve is 1.5 times the operating pressure. The opening pressure of the safety valve of a pressure vessel shall not exceed the design pressure of the vessel. **************************************************************************************** I searched and found something similar in DLT 959-2014, the \"Technical Regulations for Safety Valves in Power Station Boilers\", but the scope doesn’t match. I wonder if anyone knows where that passage came from; please give me some guidance. O(∩_∩)O Thank you!