Can the exhaust gas from atmospheric pressure storage tanks be discharged into a low-voltage system?

By applying a nitrogen seal pressure to the atmospheric-pressure tank and sending it to the low-pressure system

The typical design pressure for atmospheric storage tanks is 1.35 Kpa (the set pressure of the breather valve). For non-methane hydrocarbons, a VOCs recovery system is required; a nitrogen blanketing system must be installed before the gases can be sent to the VOCs recovery system (using an exhaust fan to create negative pressure). Low-wattage devices cannot be used in this process.

Hello, may I ask which specification outlines this?

When the breather valve of an atmospheric storage tank operates, it may draw in air. Could this air, when discharged into a low-pressure system, form an explosive atmosphere? The usual practice is to recover the liquid through low-temperature condensation – and then release it into the atmosphere after adsorption by activated carbon.

The nitrogen seal pressure is too low, preventing entry into the exhaust piping network. Additionally, the main component of the nitrogen-sealing gas is nitrogen itself, which is non-flammable; releasing it into the flare system means disposal at high altitudes, which is not recommended. For details, please refer to the relevant specifications

SH30095.2/5.3 clauses

Sure. However, the following points must be ensured: 1. The oxygen content in the gas must not exceed 2%. 2. Ensure that the calorific value of the gas is greater than the value specified in the standards. 3. Ensure that the pressure of the gas is higher than that of the low-pressure gas pipeline network.

The following points need attention: 1. The gas drawn in by the breather valve of a atmospheric pressure storage tank should not be air; nitrogen is acceptable to prevent the formation of explosive substances. 2. It is necessary to check whether the pressure in the low-voltage system is stable and whether backflow is possible; if backflow occurs, the exhaust gas from the atmospheric pressure storage tank will contain flammable gases that are not part of this system’s emissions. 3. Consider the layout of the exhaust pipeline (whether there are liquid pockets), whether the exhaust gas contains components that are prone to condensation or crystallization, and how to prevent such phenomena. 4. Check whether the components of the exhaust gas are similar to those in the low-voltage system, whether any other side reactions may occur, and whether it complies with the principles of centralized gas treatment