Vapor Accumulation in Pump Recycle Line

Hi Ali,

You said: When pump is tested on recycle by keeping its discharge valve closed,time delay in achieving its desire pressure is observed due to vapor accumulation in the line.

1. What kind of vapor are you talking about? You failed to specify.
2. What is the temperature of the lube oil?
3. What is the inlet pressure? Does this differ from normal?
4. What is the outlet pressure? Does this differ from normal?
5. If it is water vapor, how is it getting in the oil to begin with?
6. How much time delay?
7. Is this a sudden change in the normal operation of this pump?
8. If so, what is the usual time to reach the desired pressure?

Are you absolutely SURE that the time delay is caused by vapor accumulation? If so, what makes you think so?

My comments are as follow:

1. Air is accumulating in recycle line since it is not completely dip in lube oil console from where the pump is taking suction.

Actually oil is not filling the line above the level of oil in the console as shown below which result in air accumulation.

2.Discharge pressure is 12 kg/cm2.

3.Time delay is of 90 sec.previously pump instantly achieve its desire pressure of 12 kg/cm2.

4. Yes we sure that air is accumulating in the line.

Hope my point is clear now.

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I am going to bed shortly and may not get back to you until tomorrow.

Hi Mikerho!

Configuration of pump is shown above.

We are sure that oil/air vapors are accumulating the recycle line.

We run the pump several times by keeping its discharge valve closed.

On 1^st attempt, time taken by the pump to achieve its desire pressure of 12 kg/cm² was 90 sec which reduced to 25 sec in 2nd attempt. On 3rd attempt pump instantly attained its final pressure, which shows that oil vapors are accumulating the line.

Temperature of oil console is around 62 ⁰C.

Hope now the attachment is visible to you.Waiting for your comments on that.

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