3 replies to this topic

[vsnlbom]

What is effect of high point in diaphragm pump suction. Will it effect pump performance if air is trapped. As per calculation NPSHA is more than NPSHr.

 

 

[breizh]

Hi,

With high point you are going to have air trapped ! 

You need to modify the routing of the piping  to ensure the suction line is flooded  or with a continuous slope .

Download this handbook , at the end of the document you will find drawings explaining the issues .

https://www.yamadapu...ndbook 2014.pdf

Good luck

Breizh 

[vsnlbom]

thank you. Pump vendor is not having problem with this pocket in suction, not sure on what basis vendor is making this statement. 

Hi,

With high point you are going to have air trapped ! 

You need to modify the routing of the piping  to ensure the suction line is flooded  or with a continuous slope .

Download this handbook , at the end of the document you will find drawings explaining the issues .

https://www.yamadapu...ndbook 2014.pdf

Good luck

Breizh 

[horatorres]

When I work with diaphragm pumps, the first thing to check is that air is not on the suction side, otherwise it will never discharge fluid, Second, air must be dry, without any drop  of water.

 

For instance Yamada diaphragm pumps are really excellent, they have a device in the body that let you to vent the air when you start up the pump in the inlet side, if you let air in the inlet line, neven will pump.

 

About the high point, i recommended you to eliminated, it avoid future troubles,,, 

 

 

Horacio