【Common Issues in Haichuan Pipeline Design】--For acid and alkali pipelines, don’t forget to design safety protection devices at the flanges

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Code for Construction of Industrial Metal Piping Engineering GB50235-2010 7.5.10 For cast iron pipes whose working medium is acid or alkali, safety protection devices at the flanges should be installed promptly after the leakage test is passed. In industrial environments where acid and alkali pipelines are handled, using flange guards is a common safety measure. The following are some specifications related to protective covers for acid and alkali pipeline flanges: Material selection: Corrosion-resistant materials suitable for contact with acid and alkali media should be chosen to manufacture the flange protective covers, such as polypropylene (PP), polyvinyl chloride (PVC), or polytetrafluoroethylene (PTFE). These materials can resist acid and alkali corrosion, ensuring the reliability and durability of the protective cover. Dimensions and design: The dimensions and design of the flange guard shall comply with relevant engineering and safety specifications. Ensure that the protective cover fully covers the flange connection area, and has sufficient height and width to prevent acidic or alkaline liquids or splashes from entering the working area through the cover. Visual transparency: The flange cover should have sufficient transparency to allow operators to observe the operation of the pipeline and detect any abnormalities. The selection of transparent materials and the proper cleaning of the cover are very important for maintaining a good view. Installation and fixation: The installation of the protective cover shall comply with relevant mechanical engineering standards, and it must be securely fixed to the pipe flange. The installation of the protective cover should be carried out before the pipeline system is put into use, and it must undergo appropriate testing and verification to ensure its effectiveness and safety. Ventilation and venting: The flange guards in acid and alkali piping systems should take into account the requirements for ventilation and venting. This helps to remove pressure and gas from inside the pipes, reducing the risk of corrosion and the accumulation of hazardous substances. The design of the ventilation system shall meet relevant safety requirements. Regular inspection and maintenance: The protective covers for acid and alkali pipeline flanges need to be regularly inspected and maintained to ensure their integrity and performance. Regular cleaning should be carried out in accordance with the manufacturer’s instructions or safety regulations, and the wear and damage of the cover should be checked; damaged components must be replaced promptly. Please note that specific regulations and requirements may vary by region and industry. In practical applications, it is recommended to refer to local safety standards and industry guidelines to ensure that the design and use of flange guards comply with relevant specifications and requirements.