1073-040 Silence - what is the next step up.

[Gbear]

I had been considering using one of the 1073-040 Silence Return pumps to push water thru a string of reactors. I realize I'll be loosing flow with every addition. I'm currenlty using an Ehime 1262 but I want to add more bio-pellets but can't keep them moving if I do.
The 040 seems fairly similar spec wise and I don't expect it would do much different. So I could add more reactors with another 040 size pump or I could go bigger. The Tunze pumps are very efficent so I am starting here.

What is the next step up for pressure rating within the Tunze line?

Thanks,
Stu

 

[rvitko]

I would agree with your assessment, the 1073.040 is in fact likely just marginally weaker against head pressure than a 1262. The 1073.050 is just a bit stronger, if head pressure is the main concern, feeding the output of a 1073.040 into the input of another would virtually double the pressure at the output of the 2nd 1073.040, from there it is a huge step up to the 1073.110 which is 1.5" plumbing.

 

[Gbear]

Roger, thanks very much. That is an option which had not come to mind.

I have no experience doubling up with pumps. Do they need to match very closely or is it better for the first pump to have a bit more flow rate so as to avoid starving the second one? The second one will be seeing more load (I think :crazy1 so perhaps it is already running slower anyway.
Not too sure here. I know you would favor the Tunze but in my situation am I better off with another Ehime if I go this route?

Stu

 

[rvitko]

Yeah, I have never done this either, it is shown in the Silence pump manuals and our last tech session they showed us that it actually gave fairly comparable results to running the 2 pumps separately as it compensated for the head pressure losses and simplified it to one return line. The pumps do have to be identical. If you already have the 1262 I see no reason you couldn't do the same with it, but I cannot be sure.

I think essentially the impellers serve as check valves and sequentially boost the pressure of the charge from the last pump. I get an industrial surplus catalog that has a lot of odd pumps and sequential pumps are not so unusual in various industrial applications, they even make pumps with single motors running multiple heads for just this purpose.