Stainless steel caps (Stainless steel caps), also known as plug or head. Purpose: Welded to the pipe end or installed on the pipe end of the external thread to cover the pipe fittings. It is used to close the pipeline and has the same function as the plug.

The tube cap comprises a convex tube cap, a cone shell, a reducing section, a flat cap and a tightening mouth.

Convex pipe caps include: hemispherical pipe caps, oval pipe caps, dished pipe caps and spherical cap. From the point of view of force, the hemispherical tube cap in convex tube cap is gradually bad, but from the point of manufacturing difficulty, it is gradually better to manufacture.

Stainless steel: 304 304L 316 316L 321 2520 310, 317, etc.

: Diameter DN15-DN1200

Wall thickness: SCH5-SCH160

Standard: ASME DIN JIS BS GB/T JB SH HG

Uses: water, beverage, beer, food, petrochemical, nuclear power, machinery, medical equipment, chemical fertilizer, shipbuilding, waterproof treatment, pipeline, etc

Packaging: Wooden cases, carton services: provide technical advice, guidance installation, etc

The r of the disc tube cap avoids splicing, which will reduce the thinness and high stress.

When stitching, the direction of the weld is only allowed to be radial and circumferential. Large caps may remove this requirement in the future. The splicing distance should be greater than 3δ and not less than 100mm. (The welding heat affected zone is a high stress zone, and the chemical composition in the zone will be burned. So avoid the high stress zone, which is related to thickness. According to practical experience, the stress attenuation length is greater than 3δ and not less than 100mm). But refrigeration equipment is difficult to meet this requirement, has its particularity.

For the head formed after splicing, the splicing weld shall be subjected to 100% ray or ultrasonic detection, and the qualification level shall follow the equipment shell. The welding seam detection level and proportion of the final molding are the same as that of the equipment shell, which is a high waste.

Example: If the equipment housing is 20% tested, III qualified. The bulkhead splicing weld and final weld are also III qualified, and the welding joint coefficient is 0.85;

If the equipment housing is 100% tested, II qualified. The butt joint weld and the final weld are also II qualified, with a joint coefficient of 1

So although the bulkhead splicing 100% detection, but the qualification level is not the same, with the equipment shell.

But pay attention to the manufacturing process:

The correct way to do this is: blanking (marking) - small plate into large plate - molding - non-destructive testing

If it is not right to test before forming, it can not ensure that it is qualified after forming. So nondestructive testing is the final nondestructive testing.