Operating pressure of stainless steel medical and chemical equipment

The operating pressure of stainless steel equipment in pharmaceutical and chemical manufacturing is a crucial parameter in equipment design and operation management, directly affecting the equipment's structural strength, sealing performance, and operational safety. Common stainless steel equipment used in pharmaceutical production, fine chemical processing, and chemical handling includes reactors, storage tanks, mixing tanks, heat exchangers, and process piping. The operating pressure varies depending on the production process and the equipment's intended use. Commonly used 304 and 316L stainless steels possess good mechanical properties and corrosion resistance; however, the stainless steel material itself does not directly determine the pressure the equipment can withstand. Actual pressure resistance is also related to factors such as the equipment's diameter, cylinder thickness, end cap structure, welding quality, and design temperature. Generally, ordinary pressure storage tanks are primarily used in conditions close to atmospheric pressure. Some process storage tanks and conveying systems may require the ability to withstand certain positive or negative pressures, while reactors, pressure vessels, and high-pressure process equipment require specialized design based on specific production requirements. For example, the operating pressure of some stainless steel reaction equipment may range from tens of kilopascals to hundreds of kilopascals or even megapascals, making a uniform numerical value inappropriate. For equipment requiring vacuuming, the ability to resist instability under external atmospheric pressure should be a primary consideration to prevent deformation of the tank or cylinder due to excessive negative pressure. Therefore, when determining the operating pressure of stainless steel in pharmaceutical and chemical equipment, a comprehensive analysis should be conducted, taking into account the characteristics of the medium, production process, equipment structure, and relevant design specifications, to clearly define the normal operating pressure, design pressure, and allowable pressure variation range.

 

The operating pressure of stainless steel in pharmaceutical and chemical equipment should be strictly controlled within the range specified in the equipment's technical documents, and dynamically monitored in conjunction with temperature changes, medium properties, and equipment operating status. For stainless steel reactors and sealed storage tanks, pressure gauges, pressure sensors, safety valves, or other suitable protective devices should be configured according to process requirements to ensure timely detection and intervention in case of pressure abnormalities. During equipment startup, pressure should be gradually increased according to operating procedures to avoid rapid pressure changes that could cause excessive instantaneous loads on welds, flanges, and seals. Before stopping operation or performing maintenance, pressure relief, evacuation, and safety isolation should be completed according to regulations, and relevant operations should only commence after confirming that the internal pressure of the equipment has dropped to a safe level. For equipment exposed to corrosive media, the cylinder, welded joints, pipe interfaces, and seals should be inspected regularly to prevent localized corrosion, cracks, or seal failure that could reduce the equipment's pressure-bearing capacity. It is particularly important to note that operating pressure, design pressure, and test pressure are different concepts and cannot be substituted for each other. The safe pressure of equipment cannot be inferred solely from the stainless steel grade or plate thickness. For pharmaceutical and chemical equipment legally subject to pressure vessel regulation, it should be used, inspected, and maintained in accordance with applicable regulations, technical standards, and design documents. By rationally determining the operating pressure, improving pressure monitoring and protection measures, and maintaining regular inspections and operating records, the risks of overpressure, leakage, and equipment damage can be effectively reduced, ensuring the stability and safety of pharmaceutical and chemical production processes.