What are the parameters of carbon steel pipe cap

Author : admin

Update time : 2022-03-01 14:55:47

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, as follows: GB / t12459-2017, GB / t13401-2017, ASME B16 9,SH3408,
SH3409,HG/T21635,DL/T695,SY/T0510, DIN2617
Purpose of carbon steel pipe cap: water, beverage, beer, food, petrochemical industry, nuclear power, machinery, medical equipment, chemical fertilizer, shipbuilding, waterproof treatment, pipeline, etc. avoid splicing at R, which will reduce thickness and high stress.
During splicing, only radial and circumferential weld directions are allowed. This requirement may be cancelled for large pipe caps in the future.
The splicing distance shall be greater than 3 δ， And not less than 100mm (the welding heat affected zone is a high stress zone, and the chemical composition in this zone will be burned. Therefore, it is necessary to avoid the high stress zone, which is related to the thickness. According to practical experience, the stress attenuation length is greater than 3 δ， And not less than 100mm). However, refrigeration equipment is difficult to meet this requirement, which has its particularity.
For the head formed after splicing, the splicing weld shall be subject to 100% radiographic or ultrasonic testing, and the qualification level shall follow the equipment shell.
The final formed weld detection level and proportion are the same as that of the equipment shell, which is high waste. For example: if the equipment shell is 20% tested, III is qualified. The bulkhead splicing weld and the final weld are also III qualified, and the welding joint coefficient is 0.85.

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