Iwaki Pump Help

[scbauer]

do you have a picture of your setup? that way if there is something obvious, people can let you know.

I'm thinking that's what the picture is in the original post, just before water.

-Scott

 

[uncleof6]

There is no restriction to the intake of the pump unless you count the elbow before it.

Yes the elbow counts. Sounds and looks to me like the pump is cavitating. The inlet volute of the pump is too close to the 90° elbow. This causes turbulence, and a pressure differential at the inlet. Move the pump ~ 10" away from the elbow, or nose the pump in to the sump. In a non "straight shot" to the pump, I would also increase the inlet pipe to 1.25," that will reduce friction loss in the intake plumbing.

HTH,

Jim

 

[Sisterlimonpot]

Yes the elbow counts. Sounds and looks to me like the pump is cavitating. The inlet volute of the pump is too close to the 90° elbow. This causes turbulence, and a pressure differential at the inlet. Move the pump ~ 10" away from the elbow. In a non "straight shot" to the pump, I would also increase the inlet pipe to 1.25," that will reduce friction loss in the intake plumbing.

HTH,

Jim

That's a great idea and makes sense.

 

[runningnreefing]

Thank you all for your input. I think I found the problem. I am very surprised that there is such a fast build up because I just cleaned the pump a month ago. Also, I am not sure why the pump is so loud. Any ideas? Here are some pics.

 

[dahenley]

can you pull your impeller out of the housing?
is there any movement in the impeller around the shaft?
is there any evidence of the impeller rubbing on the inside of the pump housing.

 

[dahenley]

oh, and it looks like your using a 1inch sch80 ball valve. if you look on the inside of sch80 fittings, they are more restricted then standard sch 40 fittings. you might look into upping the size of your ball valve or swapping it over to a sch40. the little bit of restriction might be enough to cause you problems.