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An arrangement for access to the external cylindrical/barrel shaped surface (16b) of a gasket ( 16) in flange connections in a piping installation in which the piping installation comprises flange halves (1, 1') of the type in which a gasket (16) is positioned between the flange halves (1, 1') and t

An arrangement for access to the external cylindrical/barrel shaped surface (16b) of a gasket ( 16) in flange connections in a piping installation in which the piping installation comprises flange halves (1, 1') of the type in which a gasket (16) is positioned between the flange halves (1, 1') and the gasket ( 16) is designed to seal against seating surfaces (2a, 2c) formed by annular grooves (2, 2') in the opposite end faces of the flange halves (1, 1 '), and where annuli (22, 22') are defined by the end faces ( 16c) of the gasket (16) and the grooves (2, 2'), which thereby seal along the inner and outer periphery, and where at least one groove (14) runs from the annular groove (2, 2'), essentially in the radial, outward direction.

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What is claimed is: 1. An arrangement for detecting leakage from a flange connection, the arrangement comprising: opposing flange halves, each having an opposing end face; an annular groove formed in each end face, the annular groove having at least one seating surface; a gasket disposed between t

What is claimed is: 1. An arrangement for detecting leakage from a flange connection, the arrangement comprising: opposing flange halves, each having an opposing end face; an annular groove formed in each end face, the annular groove having at least one seating surface; a gasket disposed between the flange halves and in the respective annular grooves such that a seal is formed between the gasket and the respective seating surfaces, wherein a sealed annular gap is formed between the gasket and each groove; a radial groove formed in each end face and extending from the annular groove essentially in a radial, outward direction; a leakage indicator at least partially disposed between the end faces and in the respective radial grooves, the leakage indicator arranged to detect leakage from the respective annular gaps. 2. The arrangement of claim 1, wherein the radial grooves have a cross-section that varies. 3. The arrangement of claim 1, wherein the radial grooves have a combined depth that is essentially equal to half the length of an external surface of the gasket. 4. The arrangement of claim 3, wherein the external surface of the gasket is cylindrical. 5. The arrangement of claim 1, wherein each end face comprises an inner end face and an outer end face, the outer end face being depressed relative to the inner end face. 6. The arrangement of claim 5, further comprising a shoulder connecting the inner and outer end faces and wherein the respective radial groove extends through the shoulder. 7. The arrangement of claim 1, wherein the radial grooves are formed in the respective end faces and the respective end faces are substantially planar. 8. The arrangement of claim 1, wherein the gasket comprises a through-bore that connects at least one of the annular gaps with the radial grooves. 9. The arrangement of claim 1, wherein the leakage indicator comprises a pressure switch arranged to transmit a signal upon a pressure change in the annular gaps. 10. The arrangement of claim 1, wherein the leakage indicator comprises a connector pipe. 11. The arrangement of claim 1, wherein each annular groove has a cross-section that is trapezoidal. 12. The arrangement of claim 1, wherein each annular groove comprises inner and outer seating surfaces and the gasket forms a seal against the inner and outer seating surfaces along the inner and outer periphery of the annual grooves. 13. The arrangement of claim 12, wherein each annular groove further comprises an end face extending between the inner and outer seating surfaces, the end face defining part of the annular gaps. 14. The arrangement of claim 1, comprising a plurality of radial grooves formed in each end face and extending from the respective annular groove essentially in a radial, outward direction. 15. An arrangement for detecting leakage from a flange connection, the arrangement comprising: opposing flange halves, each comprising an opposing end face; an annular groove formed in each end face, the annular groove having at least one seating surface; a gasket disposed between the flange halves and in the respective annular grooves such that a seal is formed between the gasket and the respective seating surfaces, wherein a sealed annular gap is formed between the gasket and each groove; a radial groove formed in each end face and extending from the annular groove in a radial, outward direction; wherein each end face comprises an inner end face and an outer end face, the outer end face being depressed relative to the inner end face; a shoulder connecting the inner and outer end faces and wherein the respective radial groove extends through the respective shoulder. 16. The arrangement of claim 15, comprising a plurality of radial grooves formed in each end face and extending from the respective annular groove essentially in a radial, outward direction. 17. The arrangement of claim 15, wherein the radial grooves have a cross-section that varies. 18. The arrangement of claim 15, wherein the radial grooves have a depth that is essentially equal to half the length of an external surface of the gasket. 19. The arrangement of claim 18, wherein the external surface is cylindrical.