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High-pressure vessel flange sight glasses and sandwich flange sight glasses are named high-pressure vessel flange sight glasses in the Ministry of Chemical Industry's standards. Due to the influence of construction technology, this construction method will embed two flat flanges and clamp a layer of glass. This design is often called a flat flange sight glass; because its laminated glass is fixed by a flange, it is also called a sandwich flange sight glass.

The tube sheet is on both sides of flange fastening bolts, they are the same bolts, and the pressure on the gasket on both sides of the tube sheet is the same, and they are under force at same time.

A threaded flange is a type of pipe flange with internal threads on its bore, allowing it to be screwed onto a pipe with corresponding external threads, eliminating the need for welding for connection.

In 2023, Wenzhou Shuangneng Stainless Steel Flange and Pipe Fitting Manufacturer in Zhejiang Wenzhou pioneered a high-demand project, crafting corrosion-resistant stainless steel flanges for offshore oil rigs. Faced with rising industry needs for durable marine components, the team employed advanced forging techniques and rigorous pressure testing, delivering 5,000 units within 8 weeks, ensuring compliance with international safety standards and reinforcing their leadership in precision manufacturing.