Universal type online collecting mechanism for in-service flanges

Abstract

The invention discloses a universal type online collecting device for in-service flanges. The universal type online collecting device comprises a C-shaped belt with a notch part, and at least one ring-shaped fastening belt, wherein the inner surfaces at the two axial ends of the C-shaped belt separately define inner sealing surfaces which are in contact and sealing with a pair of flange outer-diameter cylindrical surfaces which are in butt joint with each other; at least one fastening surface is formed on the outer surface of the C-shaped belt; the ring-shaped fastening belt is fastened on the fastening surface, so that the inner sealing surfaces of the C-shaped belt separately press the pair of the flange outer-diameter cylindrical surfaces which are in butt joint with each other, and therefore, a collecting cavity is formed among the inner surface of the C-shaped belt, the outer ring surfaces of ring-shaped gaskets pressed on the pair of the flange sealing end surfaces as well as bolt supporting inner end surfaces of the pair of the flanges; and the notch part of the C-shaped defines a guide leaking hole of the collecting cavity.

Description

technical field [0001] The invention relates to the field of flange seal leakage detection, in particular to a general-purpose in-service flange seal online collection mechanism for the leakage collection of volatile organic compounds VOCs, toxic and harmful gases HAPs, and flammable and explosive gases. Background technique [0002] At present, the detection method of VOCs and HAPs leakage sources of equipment and pipeline components is LDAR, which is based on portable flame ionization (FID), catalytic oxidation or combustion method, infrared absorption method (IR or NDIR) or photoionization (PID) instrument. Methods of regular inspection and timely maintenance. Portable instruments consume a lot of power, and cannot perform online real-time monitoring of flange seal leakage sources. [0003] For this reason, Chinese Patent Application Publication No. CN101692353A discloses a leak-detectable constant-stress sealing gasket at present, which combines figure 1 As shown, it i...

AI Technical Summary

Problems solved by technology

[0005] 1. The flange seal leakage collection ring and the main seal ring are on the same gasket. To collect the leakage of the flange seal, the existing flange bolts must be removed and the existing gasket must be replaced. Even if the original gasket The current sealing performance or technical indicators do not exceed the requirements stipulated in the national standard or industry standard, and the cost is high

[0006] 2. If the size of the auxiliary seal ring used to collect the leakage of the main seal is out of tolerance, the performance of the main seal will be affected, and more accurate bolt pre-tightening force is required, which is not convenient for on-site installation and construction

[0007] 3. Due to the existence of leakage or leakage guide hole 7, the thickness of this constant stress gasket is 0.5-1.0mm thicker than that of commonly used gaskets such as metal wound gaskets, and because the first sealing ring 3 (main seal) and the second sealing ring 4 (Auxiliary seal) is generally non-metallic such as graphite. When it is installed in the flange gap in service on site, the main and auxiliary seal rings are easily damaged and thus lose the sealing or collection function; if the leak guide hole 7 is too small, it is easy to be damaged Mass fluid or tar clogged, loss of leakage function, may damage the auxiliary seal in the long run

[0008] 4. Not suitable for concave / convex and tenon / groove flange sealing surface types

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