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The 【Haichuan Equipment Guessing】 series will continue to be updated in 2027 – all Haichuan fans are welcome to participate actively! https://bbs.hcbbs.com/thread-2079686-1-1.html (Source: Haichuan Chemical Industry Forum (Hua Hai Chuan Liu hcbbs))
These shaped elbow pipes with a polished finish look quite regular; they are probably custom-made elbow fittings produced by roll welding These are generally reduced-diameter elbows customized according to specific operating conditions, and they are mostly used in pipeline systems for industrial fluid transport. I’m waiting for the original poster to reveal the correct answer!
Your analysis is quite thorough! Two additional details: First, this kind of glossy finish is usually achieved through polishing or acid washing and passivation, which not only improves the appearance but also enhances corrosion resistance, making it suitable for applications in industries such as chemicals and oil and gas transportation where there is a risk of corrosion ; Secondly, before customizing such non-standard elbows, it is generally necessary to confirm in advance the pressure rating of the pipeline and the properties of the medium being transported; otherwise, compatibility issues may arise. I’m just waiting for the original poster to reveal the final answer!
【Haichuan Chemical Valve Management】Series of Posts – Avoid losses: 25 key points for checking valve installation and use! ! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5720885 (Source: Haichuan Chemical Industry Forum (Hua Haichuan Liu hcbbs))
【Ten Years of Rapid Development in Chemical Engineering Equipment】The key technologies for polyoxymethylene production at China National Chemical Engineering Corporation Hualu from 2031 to 2026 have successfully passed the pilot-scale evaluation. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5720926 (Source: Haichuan Chemical Industry Forum (HCBBS))
【History of Haichuan Chemical】Born from oil, the once most prominent factory in Renqiu South https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5720998 (Source: Haichuan Chemical Forum (Hua Haichuan Liu hcbbs))
【Haichuan Illustrated Chemical Equipment】 Series Post -- Candle Filter https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5721117 (Source: Haichuan Chemical Forum (Hua Haichuan Liu hcbbs))
【HaiChuan Safety Discussion】Hidden Dangers Around Us -- Training PPT on Chemical Processes and Safety Engineering https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5721182 (Source: HaiChuan Chemical Forum (HuaHaiChuanLiu hcbbs))
【Common Issues in Haichuan Pipeline Design】- Complete set of colored illustrations from SH/T3012, the Standard for the Layout and Design of Metal Pipelines in Petrochemical Industries; 01 General requirements for pipeline layout: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5721249 (Source: Haichuan Chemical Industry Forum (Hua Haichuan Liu hcbbs))
【Ten Years of Rapid Development in Chemical Equipment】3134-2026: 200,000㎡ of production capacity! World’s largest gas membrane storage project completed at Yancheng Port https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5721314 (Source: HaiChuan Chemical Industry Forum (HuaHaiChuanLiu hcbbs))