What is the appropriate exhalation pressure value for the breather valve of a 31% hydrochloric acid storage tank?

For the storage of 31% hydrochloric acid, considering safety and chemical properties, the vent valve should be properly configured to control internal pressure, thereby preventing the container from being damaged or experiencing vapor leakage due to excessive pressure differences between the inside and outside. Under normal circumstances, the exhaust pressure setting for breather valves is typically in the range of 2 to 5 kPa (0.02 to 0.05 bar), with the specific value determined based on the design standards and safety requirements of the storage tank. The saturated vapor pressure of 31% hydrochloric acid is approximately 1.5 to 2 kPa at room temperature. This value is derived from experimental data by considering changes in the concentration and temperature of the hydrochloric acid solution. When setting the vent valve, it is necessary to ensure that its pressure setting is suitable for the saturated vapor pressure of hydrochloric acid, in order to safely and effectively maintain pressure balance within the storage tank. .

The design pressure range for atmospheric pressure tanks should not exceed 2 Kpa; it is recommended to set the opening pressure of the breather valve at +1.5 Kpa

Our hydrochloric acid tank vent is connected to the exhaust gas absorption tower

Without a breather valve, there will be some volatilization losses; if the costs are not calculated in great detail, this design is also acceptable.

It still needs to be designed based on the saturated vapor pressure of hydrochloric acid at room temperature. Thank you

The hydrogen chloride pressure is relatively high, so it needs to be absorbed in the exhaust gas.