Sunday, May 13, 2012


Capitation and the vapor bubble is a term often used to pump egagalan menerangkank due to steam {vapor] within the pump. Although both capitation and the vapor bubble occurs when there is gas in the pump, but each of them gives a different effect on pump operation.
            1. Capitation is the formation of steam bubbles pump suction section. Capitation often occurs when the pump is working close to the minimum required NPSH, and the pump loses suction
a heavy fluid pressure-cast fills the empty space formed by the bubbles that burst can cause damage to the pump, the outbreak of these bubbles cause noise, which can often be heard when the pump capitation.
to stop the capitation, NPSH available must be increased. This can be done to reduce the pumping capacity.
requred to reduce the required NPSH NPSH available and raise the suction pressure increase.
in other words can be explained that the capitation occurs when fluid enters the pump containing small bubbles of steam. steam is flowing through the impeller with the fluid and when the pressure rises at the pump, then some or all of the melt {vapor bubbles burst].
high centrifugal force arising from the outbreak of the vapor bubbles can cause vibration and strong and likely to damage the pump.
but it will cause noise and vibrating.
           2. vapor bubbles
The bubble vapor [vapor lock] what happens when the gas enters the pump and separate liquid besama fluid in the pump. Das it fills the whole or part of the pump.
It will compress the gas pump a little, but not large enough to mengalirkang as it came out to the pipe tap. This prevents the trapped gas liquids into the pump, consequently there is no fluid flowing through the pump. if the pump have a vapor bubble is called 'vapotr lock 'measurement instrument readings show the same press the suction pressure when the pump is going on, so come back in good condition, the steam must be removed from the pump.
In some ways this can be done by opening the vent valve when the pump is going on.
often pump must be stopped, and the house ventilated pump until the liquid therefrom keliar vent pipe, the pump can be run again.
Capitation or vapor bubbles occur when there is gas in the pump, little bubbles of the gas will menyebabkanka pitasi.
more bubbles of gas will cause the vapor bubbles [vapor lock]
Both can be prevented by preventing the entry of gas kepompa. This can be done by raising the pump suction pressure or high elevated surface vessel / tank is being pumped.

source: center for education and development of chemical industry
                              MEDAN 1987

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