Yeah, my first couple plumbing jobs I put valves on all the drains.Thanks! Well.. I am a student of OMFGWJH HELP! school of what ifs
The outlets are near water level and above the weir. Secondary my sump is big enough to handle the pump being off with a few inches to spare (without any rock in the tank).
I was told to never use a 90 because they restrict flow significantly, thats why I used all the 45s. It would be much cleaner with 90s but I didnt want to restrict my pump even further.
link.springer.com
I was told to never use a 90 because they restrict flow significantly, thats why I used all the 45s. It would be much cleaner with 90s but I didnt want to restrict my pump even further.
This data is backed up by this research paper:
Effect of 90° elbows on pump inlet flow conditions - Applied Water Science
The use of 90° elbows upstream of a pump inlet can distort the approach flow resulting in spatial and temporal velocity variations and swirling flow that negatively affect pump performance and increase maintenance requirements. In order to attend these flow conditions, pumps have to be installed...
About the radius, I watched about 985 of the 35000 BRS videos (trying to catch them all) and in every one regarding plumbing they mention to never use a 90. Then looking outside of that is where I found that paper that confirms it. You CAN use a 90 but it restricts flow. Due to design/purchasing issues I went with 3/4 pipe and that in itself restricts flow, adding 90s on top will only further the flow issues.Where does that paper show 90 vs 45? I just skimmed it but it looks like it was looking at bend radius.
If you look up equivalent length for pvc fitting you can see the two 45s is about the same as one 90.
You might need to trim your full siphon line some. It does not need to be that deep in the sump. It might have trouble clearing all the air out at start up.
I would also add some supports to the two drain lines.
Take what brs says with a grain of salt. I'm not a brs hater. I actually like a lot of their content and buy from them a lot. some of those numbers dont look right though like the sicce 3.5 how does flow increase over output with the supposed higher restriction and over all decrease much less then the other pumps? Head pressure maybe but......Here are the results of BRS test
Oh I agree. I mean yeah there is a bigger loss on 90 but is anyone going to notice that small amount. Imo its not worth worrying about to the point some do.
All of their results are within the margin of error of their flow measurement device. The real take away here is that three of the four pumps advertised a significantly higher flow rate than they actually produced...
Like I said there are issues within their tests across the board. You can not reliably one and done stuff. Who knows maybe the product being tested was dropped on its head as a baby or got bitten by a radio active bristle worm and is a supe now. Again not bashing just dont always agree with all they do and they do a lot. The 3.5 jumps out to me for many reasons but I dont know all the stats of sicce pumps havent had to sell or buy that stuff in a few years.
