The issue with the pipeline grade, B2F01~
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{:3_54:} I would like to ask everyone: in B2F01 and B2F02~B2F03, the numbers 01, 02, and 03 all refer to non-metallic gaskets. So why are there separate designations for 1, 2, and 3? Is it the gasket material they represent that’s different? So what are they respectively?
Reply to 1# caoyujiancs: The older generation of chemical engineering technicians all used this notation, where B stands for metal materials: carbon steel； 2 represents the nominal pressure: 1.6 MPa ； F stands for: the sealing surface is RF or F surface ； 01, 02, 03, up to 49: all indicate that the material of the sealing surface is an asbestos rubber gasket. As far as I know, it doesn’t really matter; it simply represents asbestos rubber gaskets. As for asbestos rubber gaskets, there is a certain difference in thickness ； If it is 50–60, it refers to a metal wound gasket or a metal clad gasket. For example, D4M50 refers to alloy steel, with a nominal pressure of 4.0 MPa, M or MF face, and a metal wound gasket. On the current PID diagram, it is shown as: L1B-H ； Pressure is indicated by letters: L stands for a nominal pressure of 1.0 MPa, 1 represents the serial number, B denotes carbon steel as the material, H indicates insulation; there is no indication for gaskets, while the type of gasket is shown in the axonometric diagram.
“For B2F01 and B2F02~B2F03, the numbers 01, 02, and 03 refer to non-metallic gaskets. These gaskets are used under different conditions (medium type, design temperature, pressure), and the specific material of the gaskets may vary; they could be asbestos gaskets or polytetrafluoroethylene gaskets, for example. The valves and pipes might also differ. For detailed information, it is necessary to refer to the table specifying the material grades for pipes provided by the design team, as it contains detailed regulations that show the subtle differences.
Reply to 2# sjxx30: Thank you~ We are still using the older method of representing pipes as you mentioned. The reason for asking this is that the design institutes now require quite precise specifications regarding the material of gaskets; specifically, for codes B2F01, 02, 03, it is necessary that these details be consistent in the floor plans, axonometric views, and PID diagrams. I would like to ask you: what is the basis for that new method of representation you mentioned? Are there any relevant **standards or chemical industry standards?
This post was last edited by sjxx30 on 2010-7-13 at 19:38. Reply to 4# caoyujiancs: Was it designed by your own company or by a design institute? Design institutes are now using new standards. **Standard: \"HGT 20519.1~20519.6-2009 Unified Regulations on the Content and Depth of Construction Drawings for Chemical Process Design\"