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Seamless steel pipe used in the piping system of pressure piping

Date:2019-01-31    View:543      Tag:Seamless steel pipe used in the piping system of pressure piping
Class-based Class I Ⅱ Ⅲ level 
design pressure / MPa design temperature / ℃ Design pressure / MPa design temperature / ℃ Design pressure / MPa design temperature / ℃ 
> ≤ 
steam and hot oil 1.6 300 O. 7~1.6 170~300 0.7 170 
fuel 1.6 150 O. 7 to 1.6 60 to 150 O. 7 60 
other media 4. O 300 1.6~4. O 200~300 1.6 200




Note: 1. When one of the design pressure and design temperature of the piping system meets the Class I specification in the table, it is defined as the Class I pipe system; when the design pressure and design temperature of the pipe system meet the Class II requirements in the table. It is designated as a Class II pipe system. 2. Other media are air, water, lubricating oil and hydraulic oil. 3. Ⅲ grade tubing seamless steel pipe can be manufactured in accordance with national standards recognized Chuanjian sector. (2) Seamless steel tubes for boilers and superheaters, whose wall temperature does not exceed 450 °C. (2) Dimensions (1) The size of the steel pipe should be preferred to the first group of ordinary steel pipe sizes in Table 1 of GB/T7395-1998. (2) The outer diameter of the steel pipe should be preferentially selected from the first series of GB/T7395-1998: the outer diameter of the standardized pipe. (3) Steel pipes of different sizes as specified in Table 1 of GB/T7395-1998 may be produced according to the requirements of the purchaser.

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