EXTERNAL GEAR PUMP .EXCESIVE VACUM PRESSURE

[Pedro1976]

GOOD MORNING:

I´m looking for some ideas to solve a problem with a external gear pump.

The gear pump is used in a vessel to move gas oil between several storage tanks.

We install a new pump after remove the previous that was the same pump type.

That is the problem that I found:

The pump start properly and start to move liquid, after a few minutes the pump make a overload sound and electric proteccion stop the electric motor .

I have found excesive vacum in inlet side an also vacum in outlet pipe.

After a few minutes if i start the pump again the process will be the same.

I have checked the elecetric motor and the turn direction an is ok.

I have cleaned the inlet filter and It was ok.

I haven`t founded any air filtration.

As I have several tanks ; I changed aspiration and discharge tanks and the results ,is always the same.

I have made this check with the relieve valve almost total open (as the manufacture indicate inthe first starter). If I tighten (or regulate a little) the relief valve, the pump overload if few seconds.

As I´m alone at sea I will apreciate any Idea about how to solve the problem.

Kind REgards

 

[LittleInch]

Can you provide any details of the pump (manufacturer / type etc)

You say this is a replacement. Is it EXACTLY the same?

Can you describe the system or sketch it? Vacuum in inlet AND outlet side doesn't seem possible. Flowrates, pipe sizes, pipe lengths etc

This sounds like the pump is either over sized and hence the pressure rises when you try and pump or something else has plugged the lines?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.