Which standard specifies the flange sealing surface of the 3-groove type?
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Gentlemen, which standard specifies the flange sealing surface of the 3-groove type? It wasn’t found in the standards for 20592-2009. But the equipment flanges of many manufacturers are like this.
The 3-groove flange sealing surface you mentioned is usually a structural type found in lens gasket flanges or special high-pressure sealing flanges. The standard GB/T 20592—2009 \"Steel Pipe Flanges, Gaskets, and Fasteners\" does not specify the sealing surface configuration for flanges with three grooves. In fact, this type of 3-groove sealing surface is commonly found in equipment or flange seals used in high-pressure or hydrogen-related applications within the oil and petrochemical industries. It usually appears in special technical designs or certain engineering specifications (such as the standards set by Sinopec and CNPC, or construction design manuals), rather than being a standard sealing surface format as defined by national or industry standards. Therefore, the structure resembling three sealing grooves that you see may stem from the following situations: 1. Corporate technical specifications or proprietary design standards (such as internal standards of companies like CNPC, Sinopec, Shell, Mobil, etc.) ； 2. Proprietary technical documents required for engineering design or specific projects ； 3. Some specific standards for chemical and petrochemical pressure equipment are cited (such as the HG series of chemical industry standards, SH petrochemical standards, and enterprise-specific technical regulations), rather than the general standard GB/T 20592**. If you need to determine the origin, it is recommended to refer to industry standards such as SH3406, SH3065, HG/T20615, and HG/T20592. - Standards specific to certain projects or enterprises, especially internal technical documents for use in special operating conditions (such as those involving high pressure, high temperature, or highly hazardous materials). In summary, the sealing surfaces of such flanges are usually not the standard types specified in GB/T 20592-2009, but rather follow special requirements set by the industry or individual companies. .
This should be a convex flange with three water lines machined on it.
Which standard specifies the sealing type for these 3 water lines?