Must pressure vessels be equipped with safety valves or rupture discs?
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According to Appendix B of GB150 \"Pressure Vessels\" – Overpressure Relief Devices, clause B1.1 states that \"when overpressure occurs during the operation of the vessel, an overpressure relief device must be installed in accordance with the requirements of this appendix.\" If the design pressure of the container is much higher than the highest operating pressure that may be reached at its top, overpressure will not occur during operation; can a pressure vessel be designed without an overpressure relief device? For example, in a nitrogen buffer tank, shut-off valves are installed at both the inlet and outlet. The maximum operating pressure of nitrogen is 0.7 MPa.g, while the design pressure of the buffer tank is 1.0 MPa.g. Since the design pressure is much higher than the maximum operating pressure, is it then unnecessary to install a safety valve? Of course, since there are valves for both import and export, if the valves are closed and a fire occurs, it is still possible for the buffer tank to experience overpressure. But should such extreme situations be taken into consideration? If a safety valve is not installed, can it pass the inspection by the special inspection agency?
In accordance with GB150 \"Pressure Vessels\", all pressure vessels that may experience overpressure during operation must be equipped with overpressure relief devices, such as safety valves or burst discs. Even if the design pressure is higher than the maximum operating pressure, a safety valve is still necessary if there is a possibility of pressure increase under closed conditions (for example, if a valve closes accidentally and temperatures rise or other factors come into play). It is also necessary to consider extreme situations such as fires, as this relates to the safety of equipment and personnel. If a safety valve is not installed, the inspection by the Special Inspection Agency generally will not be approved. Therefore, it is recommended to install an overpressure relief device to ensure safety. .
Thank you for the answer! Considering extreme situations and to pass the inspections successfully, safety valves are actually installed.
For safety reasons, safety attachments should be installed. It’s not necessary, but it can’t be missing.
Mm-hmm, the design includes a safety valve.
Most safety measures for pressure vessels are designed to protect the safety of those vessels themselves; what really needs to be protected is the safety of the upstream and downstream systems as well as the process systems. As a result, the setting for the opening pressure of safety valves is kept quite low. There is a significant risk associated with high-pressure systems being connected to low-pressure equipment. Therefore, it is advisable to separate nitrogen sealing and nitrogen purging at the source level
Pressure vessels usually require safety valves or rupture disks to ensure that pressure can be released in a timely manner in case of overpressure, thereby preventing equipment damage or safety accidents. The specific requirements are determined based on the type of pressure vessel, its application scenario, and relevant standards and specifications.
I think it should still be installed. The installation of a safety valve is itself a protective measure for abnormal operating conditions; normal operating conditions should not be taken into consideration when making this decision
Is 0.7 to 1.0 definitely much larger? Your value is truly “large” – far beyond the range. If the design pressure is 10.0 MPa, that would be fine. Conduct a Hazop analysis; other safety measures can ensure that the analysis has been carried out, so they may not be necessary.