scope:

The guideline VDI 2290 is applicable for the assessment of the technical leak tightness of flange joints used for liquid and gaseous media for that requirements in terms of emission restriction according to the TA Luft (German Technical Guidelines on Air Quality Control) have been specified. It applies without restriction to metal flanges in KHS (e.g. made of materials according to DIN EN 1092-1 to -4 of steel, cast iron, copper and aluminium) up to a maximum operating temperature of 400 °C. VDI 2290 is not applicable to flange joints of the KNS and for flanges for that no sealing constants can be determined, e.g. enamelled flanges made of glass, plastic materials or with plastic liners.

The guideline VDI 2290 applies to flange joints in pipings, on plants and valves used in all industrial sectors, in particular in the chemical and petrochemical and the petroleum-refining industry.

It does not apply to piping or flange joints designed without bolts. It is not applicable to socalled compact flange joints without seals or with a liquid seal.

In addition to the guidelines VDI 2200 and VDI 2440, the design criteria for technically tight flange joints under operating conditions are defined.

The aim of this guideline is to accurately define the status of emission reducing technology in accordance with the TA Luft for flange joints, and in particular number 5.2.6.3 of the TA Luft with regard to the requirement for a technically tight flange joint. The leak tightness classes required for a technically tight flange joint in accordance with number 5.2.6.3 of the TA Luft are defined.

Like the guideline VDI 2200, guideline VDI 2290 is intended for all manufacturers of flange joints, project engineers, design engineers and operators of machines and plants in that liquid or gaseous media are conveyed, stored and/or processed or respectively used as heat transfer medium. The guideline is not only a recommendation for manufacturers of flanges, bolts and seals and for assembly and maintenance technicians. In addition, it can support authorising and supervisory bodies in the execution of their work.