Taco 2218 tight fit..

john p_2

Need to know how many diameters of straight pipe are required (minimum) on the inlet & discharge side of the pump...I see nothing in regards to this with paperwork that comes with the pump.

Ironman

12" is recommended but not required on the inlet. If it were a large commercial pump, it would be a different story. Ya do what ya gotta do sometimes.

Joe Mattiello

you can practice the same installation recommendation used with commercial installations; 10 pipe diameters up, and 5 down. That should minimize turbulence at pump which could cause inefficiency in performance. Please contact me directly if you have additional questions.

hot_rod

As Bob mentioned above, what you should do and what actually gets installed and works, often differ.

A classic example is the internal check valves that pump manufacturers install or include. Those also should be a fair distance from the discharge, as per accepted piping practices, yet they get installed directly in the volute. I've not seen or heard of problems.


Or the pre-packaged GEO modules with two to four circs, often high head models, bolted flange to flange, yikes! Talk about a conflict of turbulence )

john p_2

Wow, 10 diameters (12"1/2") yikes! That's tough in my install.....but thanks , good info.

Rich_49

John is doing a 2 pipe buffer Bob's . his header between the boiler and tank is 1 1/4" , design load is under 70 k at design and he is extensively zoned , 5 or 6 zones I believe with a couple very small zones . He is re fitting with the buffer because of excessive cycling . Boiler is Utica SSC 75 , 60 gallon Utica H20 buffer . The VT is being used in Delta T mode and is being moved due to piping configuration

john p_2

Thanks Rich...

hot_rod

I would caution you about that header size, generously sized is the suggestion. You want the flow velocity in that header pipe as close to zero as possible. What is the required flow rate at design? Lets assume 7 gpm for that 70K boiler load.

I know it sounds overkill but 2" is a definite, 1-1/2 close, 1-1/4 a tad small perhaps, you may experience some unwanted or ghost flows or mixing.

Use the dimensioning on a hydrosep as a guide line. Our 1" sep, for example, rated for 11 gpm has a 3" barrel. That should get that flow velocity in the sep body down around .5 fps or less, under 1 fps for sure.

We have done a lot of engineering and flow testing on separator design to assure you get the results you need and expect, don't tempt fate.

Rich_49

1 1/4" is fine Bob . His average flows through the header are less than 4 gpm with very short excursions above that flow rate . 6.5 would be the absolute max flow with all zones calling at design . Maybe 2 hours a year . Thanks for the input