Pressure vessels cannot withstand negative pressure; what methods and automatic controls can be used to prevent the occurrence of negative pressure?

Set pressure regulation and install a pressure replenishment valve, which adds gas when the pressure drops below a certain level. Select the gas components to be added based on actual operating conditions. Alternatively, a vent valve can be installed; when the pressure drops below a certain value, the vent valve closes to prevent the formation of negative pressure. Or both valves are installed

In production, there is a type of valve called a vacuum-breaking safety valve. It’s to protect the equipment from damage.

To prevent the occurrence of negative pressure, the following measures can be taken: 1. Design a reasonable structure: During the design process of pressure vessels, it is necessary to consider the structural strength of the vessel as well as the balance between internal and external pressures, thereby ensuring that no negative pressure is generated under normal operating conditions. 2. Install appropriate safety devices: Negative pressure valves or vacuum valves can be installed on pressure vessels; when negative pressure develops inside the vessel, these devices will open automatically to balance the pressure inside and outside, preventing the vessel from rupturing due to excessive negative pressure. 3. Use of an automatic control system: Negative pressure monitoring can be combined with an automatic control system; when the negative pressure exceeds the set safe range, the automatic control system can take action automatically, such as activating supplementary pressure or other appropriate measures, to maintain stable pressure inside the container. 4. Regular inspection and maintenance: For pressure vessels, it is very important to carry out regular inspections and maintenance in order to identify and fix any issues that could lead to negative pressure, thus ensuring the safe operation of the vessels. .

This post was last edited by Zhongyuanren on 2023-6-25 00:34 to set pressure regulation, and to install pressure relief valves and vent valves (controlled by valves A and B). When the pressure inside the pressure vessel is below the set value, the pressure relief valve is activated to supply gas to the vessel (the appropriate gas for supplementation is selected based on the actual operating conditions), and once the set pressure is reached, the pressure relief valve closes automatically ； When the internal pressure of the pressure vessel exceeds the set pressure, the relief valve automatically opens to release pressure. When the internal pressure returns to the set level, the relief valve closes automatically, preventing the occurrence of negative pressure.

Why does negative pressure occur? First, describe clearly the reason for the negative pressure. Fix the cause of the negative pressure; as long as no negative pressure is generated, that’s sufficient. Alternative solutions: Detection-alarm-control – Install pressure transmitters to monitor the pressure inside the container in real time, and trigger an alarm when the pressure approaches 0 ； After an alarm is triggered, the pressure valve opens to fill the container with pressure. When the pressure reaches a certain level, the pressure filling valve closes. Continue testing.

To prevent negative pressure from affecting pressure vessels that cannot tolerate it, the following methods and automatic control measures can be adopted: Design and select pressure vessels capable of withstanding negative pressure – in engineering design, pressure vessels that can withstand negative pressure should be chosen, so as to maintain the integrity of their structure even if negative pressure occurs during operation. Installing a vacuum valve: Installing a vacuum relief valve on a pressure vessel enables the balance of pressures inside and outside the vessel, preventing the formation of negative pressure. The vacuum valve can open automatically to release the air entering the container, thereby preventing a vacuum from forming inside it. Design of auxiliary equipment: Designing safety accessories such as level controllers, temperature controllers, and gas venting systems can help control the pressure inside pressure vessels and ensure that no excessive negative pressure is generated. Safety control system: A reliable automatic control system is used to monitor and control the pressure within pressure vessels, allowing for timely measures to be taken to prevent the occurrence of negative pressure. When the pressure exceeds the preset value or negative pressure occurs, the system should be able to issue an alarm in a timely manner or trigger corresponding actions to keep the pressure within a safe range. Regular inspection and maintenance: Periodically inspect and maintain pressure vessels to ensure they are in good working condition. If any damage or potential risk of negative pressure is detected, the relevant components need to be repaired or replaced promptly.

What is the reason for not being able to withstand negative pressure?

Why does negative pressure occur when there is a resistance to it? What an interesting paradox! We still need to solve the problem at its root!