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Xuzhou Xinda Heat Transfer Equipment Co., Ltd.

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Society Heat Treatment Branch

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Analysis of heat exchanger flange sealing surface mat failure leakage reason

1 Effect of temperature
The horse 5 station undertakes the daily 1200m3 crude oil liquid quantity output task, for the smooth to transport oil to 8 2km far from the Yellow Jue united station, requires 70 C heat exchanger crude oil temperature 60 ~.
(1) the effect of temperature on material properties. The horse 5 station heat exchanger cover seal and floating tube plate is two pieces of circle hook hook stuck in the back of tube sheet, forming the hook flange, bolt connection, hook flange is cut into two overall after processing. Hook ring, bolts and other materials in the use process, for a long time in high temperature of 120 DEG C for 100 to the environment, reduce its mechanical properties, creep and stress relaxation phenomenon will occur (homogeneous hook different parts of its thermal expansion are different), the tension force of the bolt decreases. Cause the pressing amount of flange on the mat and the decrease of the leakage.(2) the effect of temperature on the gasket. The horse 5 station heat exchanger flange is the use of oil resistant asbestos rubber plate made of pad, gasket aging and long-term will cause it to lose because of the elastic cushion leakage in high temperature 55 to 120 DEG C under the action of.
(3) effect of temperature difference. The temperature difference between the heat exchanger flange, barrel, bolt, gasket, tube box exists, so that each part of the thermal expansion and contraction is not uniform, resulting in the horse 5 transfer station heat exchanger flange gasket leakage.
(4) effects of heat exhaustion. The heat exchanger in the work process, by repeated heating and cooling to produce greater thermal stress, especially the bolt under repeated this force structure is destroyed, the nut loose tightening force decreases, causing heat exchanger flange gasket leakage.
2 Effect of pressure fluctuation
(1) regularly with 1000m3 accident tank bottom water horse 5 transfer stations, large displacement of 8 2km long pipeline of wax, or upstream water increase, so when the pipeline transport a large amount of water, the viscous resistance is reduced, transported dry pressure decreases, at this time the pressure fluctuations, the pressure fluctuation was about 015 ~ 0 25MPa.
(2) increase the output displacement stem pressure, pressure fluctuation generated is about 015 ~ 0 25MPa
(3) caused by various faults frequent stop, start, pressure fluctuation generated between 0 ~ 2 5MPa. Heat exchanger flange, bolts and cushion deformation easily under the action of the pressure the alternating mat, caused by failure.Reason 3 aspects of design

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