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Due to the particularity of the process medium in the synthetic butyl rubber device, the mechanical seal of the reactor or mixer frequently leaks. This article describes how a factory reduced the leakage rate of the mechanical seal by adding a throttling bush at the front end of the mechanical seal and arranging a reasonable flushing scheme.
Double cartridge mechanical seals have been widely used in agitator equipments in chemical production. Compared with single mechanical seals, double mechanical seals have better sealing performance. They can effectively prevent the leakage of dangerously toxic, flammable and explosive substances thus have an insurance effect.
In the synthetic butyl rubber device of a certain factory, the process medium in the agitator has the characteristics of deep cooling (about -100°C) and containing suspended particles (colloidal particles), which puts high requirements on the performance of mechanical seals. .
Phenomena analysis：
1. The polymerization kettle, degassing kettle, and stripping kettle in this plant are stirring shaft-bottom-inserted agitator), and its mechanical seal is EKATO back-to-back double mechanical seal S034GD series. The basic parameters of the said agitator are as follows.
1. The polymerization kettle, degassing kettle, and stripping kettle in this plant are stirring shaft-bottom-inserted agitator), and its mechanical seal is EKATO back-to-back double mechanical seal S034GD series. The basic parameters of the said agitator are as follows.
2. The mechanical seals of all above-said agitators did not leak frequently at the initial stage of operation.
3. Most of the mechanical seals installed in the agitators have such phenomenon: The primary seals of the mechanical seals failed before the secondary seals did, and after dismantling, it was found that the rotary faces and stationary seats of the mechanical seals of the polymerization kettles were broken, and the sealing surface of the rotary faces often carried glue; the front end of the degassing kettles' mechanical seals were glued, and their rotary faces and stationary seats were broken.
4. The O-rings of the mechanical seals of the polymerization kettles had been replaced with low-temperature-resistant materials many times before, but the leakage rate did not significantly reduce after such measures were taken.
5. Leakage often occurd during the time when the agitators wre stopped & restarted, and there was often a temperature change with the media in the agitators.
3. Most of the mechanical seals installed in the agitators have such phenomenon: The primary seals of the mechanical seals failed before the secondary seals did, and after dismantling, it was found that the rotary faces and stationary seats of the mechanical seals of the polymerization kettles were broken, and the sealing surface of the rotary faces often carried glue; the front end of the degassing kettles' mechanical seals were glued, and their rotary faces and stationary seats were broken.
4. The O-rings of the mechanical seals of the polymerization kettles had been replaced with low-temperature-resistant materials many times before, but the leakage rate did not significantly reduce after such measures were taken.
5. Leakage often occurd during the time when the agitators wre stopped & restarted, and there was often a temperature change with the media in the agitators.
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