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3.4.1 All equipment in this code shall be protected by overvoltage.
3.4.2 The overvoltage protection of the equipment connected with the atmosphere must be in accordance with the following requirements.
1 Shall be open at the top，and should be communicated directly with the air；
2 The sectional area of the vent shall not be less than the larger value between the inlet and outlet dimensions of the equipment（net circulation area）；
3 Airtight vent must not be prohibited；
4 The overflow port shall be installed，and the section area of the overflow port shall not be less than the inlet dimension.
3.4.3 Overvoltage protection for equipment that does not interconnect with the atmosphere shall be in accordance with the following requirements：
1 Overpressure relief devices shall be installed for equipment with overpressure during operation；
2 The installation of overpressure relief device shall conform to the relevant provisions of GB 150.1 Pressure Vessels-Part 1 ： General Requirements .