Specializing in the R&D, manufacturing, and sales of pressure piping components since 1975.
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中文Detailed Principle of Necked Flat-Welded Flange Sealing
The two sealing surfaces of the bolt compress against the flange gasket, creating a seal—but this also leads to seal failure. To maintain the seal, immense bolt clamping force must be sustained, which in turn requires the bolts to be made larger. And larger bolts naturally demand correspondingly bigger nuts, meaning that even greater-diameter bolts are needed to provide adequate space for tightening the nuts.
2023-03-30
The two sealing surfaces of the bolt compress against the flange gasket, creating a tight seal—but this process also inadvertently leads to seal failure. To maintain that critical seal, immense bolt clamping force must be sustained, which in turn requires the bolts themselves to be made larger. And larger bolts naturally demand correspondingly bigger nuts, meaning that even greater bolt diameters are needed to provide sufficient space for tightening the nuts securely. However, as the bolt diameter increases, the flange it’s designed to support becomes more prone to bending—a problem that can’t be easily resolved. The only viable solution is to reinforce the flange by increasing its wall thickness. As a result, the entire assembly ends up being significantly bulkier and heavier, which poses a particular challenge in offshore environments, where weight remains one of the primary concerns that engineers simply cannot afford to overlook. Moreover, fundamentally speaking, flat-welded flanges are inherently an inefficient sealing solution. They force 50% of the bolt load into compressing the gasket, leaving only the remaining 50% available to actually maintain the system’s internal pressure.
Storage Knowledge for Anti-Corrosion Steel Pipes
1: To facilitate product management at the anti-corrosion plant and ensure convenient on-site application by construction units, all internally coated steel pipes must have a clear and visible qualification mark or label affixed to their outer surfaces after passing inspection.
2: After the production of internally coated steel pipes is completed, if external anti-corrosion treatment is required, re-labeling should be performed on the surface of the external anti-corrosion layer after the external coating process is finished.
3: Stacked lengths should have drainage ditches, and the pipes should be kept 150 mm above the ground to prevent rainwater from entering the pipes.
4: The interior of IPN8710 anti-corrosion steel pipes should be free of debris such as sand and gravel, as these can otherwise disrupt frontline construction and impair the efficient transportation of pipeline media.
Specializing in the R&D, manufacturing, and sales of pressure piping components since 1975.
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