Blind plate it is a flange without a hole in the middle, used to seal the pipe opening. In appearance, blind plate is generally divided into plate blind plate, 8-shaped blind plate, insert plate, and pad ring (insert plate and pad ring blind to each other). There are many types of sealing surface, including plane, convex surface, concave and convex surface, tenon groove surface and ring joint surface. Materials are carbon steel, stainless steel, alloy steel, copper, aluminum, PVC and PPR, etc。
Flange blind is the connecting device of two large diameter pipes, usually two flanges and a number of fastening bolts. Large flanges are made of steel. Low carbon steel has good plasticity and low strength. After adding an appropriate amount of carbon, it will become hard, and the plasticity will decrease and the strength will increase. Flange connection may need to withstand very high tensile, compressive, torsional, shear strength, carbon steel flange is a better choice. Generally used in the pipeline, in that case, loose bolts can rotate the pipeline on both sides, and then tighten it can be more convenient to disassemble the pipeline is made of carbon steel flange called carbon steel flange。
With the rapid development of foreign and domestic pipeline construction, the pipeline pressure test has become an essential important link. Before and after the pressure test, it is necessary to sweep the line through the ball of each section of the pipeline, the frequency is generally 4 ~ 5 times. Especially after the pressure test, it is difficult to clean the stored water in the pipeline, and the cleaning times will be more. There are some problems in the construction method of repeated welding head at ball receiving place: one is to increase the labor intensity of workers; Second, the repeated welding head method has high consumables, large equipment needs more times, and high cost. In order to solve the problems of high labor intensity, high consumable material, need for large equipment and high cost when using repeated welding head method in ball sweeping after pressure test of long distance pipeline, a new construction method of quick opening flange blind plate is put forward. The construction method introduces the structure, working steps and strength check of the fast opening blind plate。
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