Stainless Steel TP304 Pipe Cap Pipe Closed Pipeline Fittings

Pipe cap, other names: head, plug, cap, pipe cap, bulkhead. Mechanical use: pipe fittings welded on the pipe end or installed on the external thread of the pipe end to cover the pipe. Used to close the pipeline, the function is the same as the pipe plug. The form of the blind plate is similar, except that the blind plate can be disassembled and blocked, while the welded pipe cap cannot be disassembled.
The cap includes a convex cap, a cone shell, a variable diameter section, a flat cap and a shrinking port design. Convex tube caps include: hemispherical tube caps, oval tube caps, dish-shaped tube caps and spherical caps. The material can be divided into 20G, 20#, Q235, Q345, Q345D, 16Mn, 12Cr1MoVG, 15CrMo, 304, 304L, 316, 316L, 321, 2520, 310, 317 and other materials. Diameter: DN15-DN2020; wall thickness: SCH5-SCH160-XXS
Standard: ASME DIN JIS BS GB/T JB SH HG,
The details are as follows: GB/T12459-2005, GB/T13401-2005, ASME B16.9, SH3408, SH3409, HG/T21635, DL/T695, SY/T0510, DIN2617
Uses: water, beverages, beer, food, petrochemicals, nuclear power, machinery, medical equipment, fertilizers, shipbuilding, waterproofing, pipelines, etc.

Avoid splicing at r of the dish-shaped tube cap, which will cause thinning and high stress.

When splicing, the welding direction is only allowed to be radial and circumferential. Large caps may cancel this requirement in the future. The splicing distance should be required to be greater than 3δ and not less than 100mm (welding heat-affected zone is a high stress zone, and the chemical composition in this zone will be burnt. So avoid the high stress zone, which is related to the thickness According to practical experience, the stress attenuation length is greater than 3δ and not less than 100mm). However, refrigeration equipment is difficult to meet this requirement and has its particularity. For the heads formed after splicing, the splicing welds should be subjected to 100% radiographic or ultrasonic testing, and the qualification level follows the equipment shell. The final welding seam inspection level and proportion are the same as those of the equipment shell. If the equipment shell is tested at 20%, it is qualified as III. The bulkhead splicing weld and the final weld are also qualified as III, and the weld joint coefficient is 0.85

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