Using metal gasket as flange gasket

(1), two pieces of hook ring is fixed with bolts in the design, in order to prevent man-made shedding, injured people and flange sealing surface.

(2) the heat exchanger tube leakage occurs, because of heat exchanger fouling and corrosion to the damaged spare heat pipe heat exchanger tube update. With this method, in the event of a plurality of heat exchange pipe leakage, affecting the flow area and the heat transfer area, cut the pipe flange and replace all. The proposed fixed tube plate heat exchanger and the cylinder flange welding as a whole, namely in the cylinder is welded on the blind flange, blind flange on the open hole in a heat exchanger tube, which can reduce the number of leakage caused by design.

(3) due to the existence of many unfavorable factors, metal gasket is recommended to be used as flange gasket. The flange gasket should not have bumps, cracks, convex pits, wrinkles, burrs and other defects, especially not with the radial notch, does not allow the use of double oblique gasket and gasket, gasket installation, flange sealing surface defects must handle all affect the seal. Because the metal gasket of the dense pressure ratio of 110MPa, than the 3mm thick rubber asbestos gasket gasket 10 times (now the use of metal gaskets, the use of good results).

(4) the matters needing attention in the flange connection. Should pay attention to the connection flange: flange and cylinder assembly, check on the end surface of the cylinder body L-square, inclined end size can not be larger than 1 5mm; the flange and cylinder assembly, to check the verticality of flange bending ruler flange; the fixed tube plate assembly and the heat exchange tube, the same also to use the flange bending ruler check fixed tube plate and the heat exchange tube and baffle the verticality; the flange and the flange sealing surface should be parallel connection.

(5) in the tube plate welding heat exchange tube, in order to reduce welding deformation caused by the flange sealing surface, the floating head cover flange (not welding head) and hook ring tightening bolt, flange and tube plate of mark. On the basis of this, the additional steel is fixed and the welding deformation in the heat affected zone is reduced. The horse 5 transfer station heat exchanger floating side tube plate heat pipe from the sealing surface distance is small, heat effect of welding, easy to make in the welding heat exchange tube in the process of welding deformation of floating tube plate heat exchanger, influence degree of the sealing surface of the seal.