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connected in series mechanical seal cooling water to cover the upper part, when the temperature is too high, the water spray cooling cover mechanical seal. 4 The effect of reconstruction rehabilitation programs as described above, in April 2000, in the propylene pump P4005, P4006 series is installed on an improved mechanical seal, with DB-10 transformer oil as a seal in the isolation solution, test a success, and has been operating for three years no leakage, can solve the problem of propylene pump seal. After the transformation of propylene pumps: (1) Run a long cycle, reducing the gas separation unit unscheduled stop. (2) safe. One end of the mechanical seal media leaks, the leak sealing oil leaking into the medium, in the overflow tank after the low-pressure gas into the gas tank recovery system is not the formation of mixed gas in the field, do not pollute the scene. (3) anti-pressure fluctuations and strong technology system. When the pump pressure instability, mechanical seal occurs when the axial moving string, the auxiliary 0-ring seals when sliding on the shaft oil lubrication, not easy to damage, can better maintain the seal. (4) better low temperature performance. Atmospheric pressure, water freezes at 0 ~ C start, expand, easy to freeze mechanical seal, DB-10 transformer oil no higher than a freezing point of 10%, in a lO ~ C without freezing, not freezing mechanical seal . Also, do not use water as a spacer to eliminate the phenomenon of taking scale, the scale will not be stuck in the closed part of the problem caused by seal failure. (5) economic benefit is obvious: 1) Series sealed long life, reducing the consumption of spare parts, accessories cost a year can save about l0 million; 2) run-time with seal oil for isolation from the circulation of foreign emissions to replace the cooling liquid water, reduced water consumption; 3) The media to not leak, the pump run without steam driven media leaks, saving steam. Since June 2000 began, one after another the other light hydrocarbon series mechanical seal on the pump for similar improvements,[link widoczny dla zalogowanych], are basically achieved the desired effect. The rehabilitation programs for other light hydrocarbon pumps also have promotional value. 5, operation and maintenance and storage tanks, storage tanks and flowlines Road to the valve open, so that seal oil into the series mechanical seal, mechanical seal on the series out of tubing union apart, to be exported out of the oil pipe and then plug the connector to prevent the first mechanical seal in tandem when driving there is gas,[link widoczny dla zalogowanych], resulting in seal from the circulation, burn seal. (2) pump run-time support system should pay attention to check the seal to observe the flow of oil, the oil should flow from the tank into the lower part of the mechanical seal from the tank back into the side of the upper tank. When the flow direction should pay attention not to add oil to the tank to prevent the oil level below the mouth when the tubing leading mechanical seal without oil circulation and burned. (3) running out of oil seal shaft sealing temperature should not exceed 60 ℃. (4) The tank pressure should not exceed 0.2MPa. After the transformation, storage tanks connected to the system with low-watt, oil storage tank pressure is approximately zero, running in good condition. (5) should be started immediately after the centrifugal pump outlet valve is opened, in the case of a closed discharge valve, pump run time can not exceed 5rain, in order to avoid pump overheating, burn seal. Tandem mechanical seal 6 on the idea of further transformation of (1) increase the flow of oil seals, pressure to reduce dynamic and static friction ring seal surface of the mixing of heat and heat pump loop, reducing the temperature series mechanical seal. Do not use water spray to cool the mechanical seal cover to prevent water from entering the bearing housing. (2) Installation of leak alarm system. Install relief valve in the storage tank, pressure reducing valve and pressure switch,[link widoczny dla zalogowanych], the implementation of real-time monitoring of seal leakage. Trace occurs when the seal leaks, from the media at the end of a seal leak gas from the top of seal oil into the storage tank, storage tank from the top and then discharged through the relief valve to the low-watt system recovery from the gas tank, pump continue normal operation; occurs when a large number of seals leak, from the media at the end of a sealed storage tank leaked gas so that the pressure increases, triggering the alarm device on the pipeline, to remind the operator to immediately stop the pump. At the same time the relief valve closed, the gas pipeline by-pass emissions by the vacuum valve to the low-watt system. References: [1] Chen before, Cui Derong. Design and manufacture of mechanical seals and use of [M]. Machinery Industry Press, 1993. [2] Gu Yongquan. Fluid seals [M]. Petroleum University Press, 1990. Tandem mechanical seal test run before Note: About the Author: Jiang rate dimension (1963.), Male, engineer,[link widoczny dla zalogowanych], is engaged in security technology and management (1) mechanical seal assembly after the sealing of oil filled sealed container management work, communication Address _414014 Yueyang Baling Petrochemical Company olefin plant.
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