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DEAR ALL,
We are using the water ring vacuum pump for charging the solvents in reactors, nutsch filtration and distillation in chenmical plant. during the process we are facing the problem of frequent tripping of pump. As i know the one reason of tripping is increase in flow rate. whats are other reason of tripping?
Reply me
Thanks
Amit Biniwale
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Problem In Water Ring Vacuum Pump
Started by Guest_Guest_amit biniwale_*, Dec 23 2004 03:45 AM
3 replies to this topic
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#1
Guest_Guest_amit biniwale_*
Guest_Guest_amit biniwale_*
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Posted 23 December 2004 - 03:45 AM
#2
Art Montemayor
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Posted 23 December 2004 - 12:54 PM
Amit:
As I understand it, you are transferring solvents into reactors, filters, and distillation equipment by pulling a partial vacuum on the equipment, shutting off the vacuum source and opening the solvent line into the equipment. If the initial vacuum is not enough to charge the required solvent, you open the vacuum source again and allow more solvent in. (during the latter vacuum pull you are drawing out heavier vapor than the initial air). This is the usual way of charging hazardous, toxic, or expensive chemicals into a vessel. By initially evacuating the vessel to the maximum partial vacuum, you avoid having to draw out chemical vapors during this phase.
If your LR (Liquid Ring) pump is “tripping out” it could be due to a process overload or an electrical trip. If the process is to blame, then the vapor flowrate taken by the pump must be greater than the rated or its vapor density is greater than rated. Either of these two circumstances will force the pump to draw more horsepower. The LR pump is usually rated for maximum vacuum, so the pressure drop across the LR pump is not an issue.
To specifically answer your question requires knowledge of how the LR pump was specified, how it was installed (HP capacity), and the actual process conditions imposed on it. Assuming that it is not an electrical trip, the pump motor must then be tripping due to a process overload. Consequently, the characteristics of the vapor being handled (density, flowrate) must exceed those that were originally specified prior to purchase. Take a good look at your specification and make the proper readings and analysis of your process. You will find your process bottleneck by doing the above. You must establish that you are working well below the maximum electrical power draw. If you don't find anything exceptional or suspicious in the process conditions, then look to finding something in the electrical installation.
Art Montemayor
As I understand it, you are transferring solvents into reactors, filters, and distillation equipment by pulling a partial vacuum on the equipment, shutting off the vacuum source and opening the solvent line into the equipment. If the initial vacuum is not enough to charge the required solvent, you open the vacuum source again and allow more solvent in. (during the latter vacuum pull you are drawing out heavier vapor than the initial air). This is the usual way of charging hazardous, toxic, or expensive chemicals into a vessel. By initially evacuating the vessel to the maximum partial vacuum, you avoid having to draw out chemical vapors during this phase.
If your LR (Liquid Ring) pump is “tripping out” it could be due to a process overload or an electrical trip. If the process is to blame, then the vapor flowrate taken by the pump must be greater than the rated or its vapor density is greater than rated. Either of these two circumstances will force the pump to draw more horsepower. The LR pump is usually rated for maximum vacuum, so the pressure drop across the LR pump is not an issue.
To specifically answer your question requires knowledge of how the LR pump was specified, how it was installed (HP capacity), and the actual process conditions imposed on it. Assuming that it is not an electrical trip, the pump motor must then be tripping due to a process overload. Consequently, the characteristics of the vapor being handled (density, flowrate) must exceed those that were originally specified prior to purchase. Take a good look at your specification and make the proper readings and analysis of your process. You will find your process bottleneck by doing the above. You must establish that you are working well below the maximum electrical power draw. If you don't find anything exceptional or suspicious in the process conditions, then look to finding something in the electrical installation.
Art Montemayor
#3
Guest_npp_*
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Posted 15 March 2005 - 09:56 AM
You don't state what type of sealing liquid used in the pump. I suppose it is water. In principt the sealing liquid vapor pressure at operating temperature should be lower than suction pressure. Otherwise the sealing liquid will vaporize at the suction and pumping capacity will be reduced to 0.
As state by Art, solvent vapor can be pulled to the pump and compressed to discharge pressure. The solvent vapor migh condense and stay in the sealing liquid as a missible or immissible mixture, if it has not been removed effectively. This causes increasing vapor pressure of sealing liquid and give the problem.
As state by Art, solvent vapor can be pulled to the pump and compressed to discharge pressure. The solvent vapor migh condense and stay in the sealing liquid as a missible or immissible mixture, if it has not been removed effectively. This causes increasing vapor pressure of sealing liquid and give the problem.
#4
drdave
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Posted 19 March 2005 - 11:42 AM
Amit,
Normally,water ring type vacuum pumps are specified with certain flow at certain vacuum developed AND invariably at given water injection rate.
In any case, Water injection rate goes beyond its specified value and if flow of fluid to be evacuated is also more than specified,It may trigger tripping.To avoid such simultaneous happenings of flow rises may be monitored with "RO" on motive fluid injection rate.Can you give these type of observations on your problem?????
Normally,water ring type vacuum pumps are specified with certain flow at certain vacuum developed AND invariably at given water injection rate.
In any case, Water injection rate goes beyond its specified value and if flow of fluid to be evacuated is also more than specified,It may trigger tripping.To avoid such simultaneous happenings of flow rises may be monitored with "RO" on motive fluid injection rate.Can you give these type of observations on your problem?????
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