KINNEY KT VFP Series, Инструкция по установке, эксплуатации, обслуживанию и ремонту, Страница: 8 / 24

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6. Adjust the Gas Ballast (See the Gas Ballast section). The small gas ballast valve can be set to quiet the pump during blank off
conditions and left open if an ultimate vacuum of 0.05 to 0.10 torr is acceptable.
7. Run the pump at blank off for 5-10 minutes and then with full gas ballast for 10-15 minutes before opening the suction of the
pump to a higher air pressure.
STOPPING THE PUMP
1. Close isolation valve.
2. Open the vent valve while the pump is still operating.
3. Close gas ballast valve.
4. Stop pump. NOTE: The vent valve must be opened for at least ten seconds before removing power from the pump. This will
allow all the oil in the pumping chamber to be transferred into the oil separator housing.
5. Shut off cooling water.
6. Close vent valve.
HANDLING LARGE QUANTITIES OF WATER
Use of the gas ballast valve enables Tuthill Vacuum & Blower Systems pumps to handle small to moderate amounts of water and
other vapors in the suction gas stream. See the Gas Ballast section.
For applications where the vapor load exceeds that which can be handled by the gas ballast valve, consult Tuthill Vacuum & Blower
Systems about Vapor Handling Systems, which can usually be retrofitted to existing pumps.
KT-Series pumps can accumulate ¾ to 2 ½ gallons of water depending on model, in the reservoir before the water level reaches the
oil line pickup where it could circulate through the pump. If water or other condensate collects in the oil reservoir the water should
be drained before the level reaches the oil line pickup. To drain water from the pump crack the oil drain valve and leave it open until
any water accumulation has drained out. Drain the water as often as necessary.
GAS BALLAST
The gas ballast valve is shown in Figure 1. Gas ballast is used while the pump is running, to prevent internal condensation of oil
insoluble vapors such as water, alcohol or acetone and to quiet the hydraulic noise when running pump at blank-off conditions.
When gas ballast is used, the ultimate pump pressure increases, more oil mist is created in the pump discharge, and power
consumption increases slightly (within the standard motor rating). Pump noise can be generally eliminated by using a small flow of
gas ballast with only slight increase in ultimate pump pressure.
Continuous use of gas ballast is recommended where the process pressure requirements can be met with the gas ballast valve
open; otherwise, intermittent use of gas ballast between process cycles is suggested. If use of gas ballast at neither of these times
is tolerable it is advisable to run the pump, using gas ballast, when process work is not being done such as overnight.
Use the gas ballast valve as follows:
1. Continuous gas ballast. With the pump operating, open the gas ballast valve until the ultimate pressure is slightly below that
needed for the process. Operate the pump in this manner continuously to aid in preventing oil contamination.
2. Intermittent gas ballast during processing. With the pump operating, fully open the gas ballast valve during periods when this
will not affect the process (work preparation, recycling, etc..). This will aid in cleaning the oil.
3. Continuous gas ballast when not processing. With the pump operating, but isolated from the process, fully open the gas ballast
valve. If convenient, operate the pump overnight in this manner to clean badly contaminated oil. Gas ballast will remove vapor
contamination but will not remove solids such as varnish.
If it is necessary to clean the oil using gas ballast in the short period, the time needed can be estimated as follows: Open the gas
ballast valve fully and operate the pump for a short period (15 to 20 minutes). Close the gas ballast valve for 1 to 2 minutes and
observe the pressure change. Use the “pressure change versus time” as a rough guide to estimate the total time required to obtain
the desired blank-off pressure.