How to keep loc-line from moving

[azbigjohn]

The whole reason for using loc-line is the ability to bend it into shape, I realize.

I have a loc-line splitter to take my single return and make it cover both sides, but if all possible, I want the splitter to not move. It keeps Gallo g under the weight of the remains loc-line. So I get this:

When I want this:

Any ideas?

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[Syntax1235]

If the splitter is moving, maybe a few wraps of teflon tape to tighten it up where it screws into the bulkhead? Should work.


Do you really need that much locline?

 

[McArcher]

Too much locline. I would come out of the bulkhead with a pvc tee and then 6" or so of pvc in each direction. Then put a short run of locline on each end.

 

[805reef]

I agree, I think its too much locline, but if that's how you want it then that's your choice. I would try it with the tank filled with water. Maybe the water will reduce the gravity effect. I dunno... good luck!

 

[justingraham]

That's a lot of loc line

Like people above said use pvc then the ends loc line

 

[McArcher]

You are also sacrificing flow with that setup. Locline produces serious headlosses. You want to use as little as possible to achieve the flow patterns you are looking for.

 

[azbigjohn]

If the splitter is moving, maybe a few wraps of teflon tape to tighten it up where it screws into the bulkhead? Should work.


Do you really need that much locline?

I thought I was improving flow by removing the T and two 90 degree elbows doing it with less would use.... I could re-design it.

Too much locline. I would come out of the bulkhead with a pvc tee and then 6" or so of pvc in each direction. Then put a short run of locline on each end.

Thanks. I thought I was reducing resistance with th eloc-line, but it appears I was wrong.

I agree, I think its too much locline, but if that's how you want it then that's your choice. I would try it with the tank filled with water. Maybe the water will reduce the gravity effect. I dunno... good luck!

That's a lot of loc line

Like people above said use pvc then the ends loc line

You are also sacrificing flow with that setup. Locline produces serious headlosses. You want to use as little as possible to achieve the flow patterns you are looking for.

That is surprising to me. I has thought I would be reducing resistance by eliminating a T and 2 90 degree angles in PVC. I can re-do it using PVC by buying two loc-line threaded pieces. Here I thought I had found a better work around!

Thanks everyone for your thoughts and ideas!

 

[McArcher]

Your thought process was good, but you lost much more than you gained. Head losses are caused by several factors. The most important of which are "minor" losses and friction losses. The biggest contributing factor to either of these is velocity (which is why you should use the largest pipe that is reasonable for your application). Friction losses are pretty self explanatory and are caused by friction between the fluid and the walls of the pipe. Minor losses are caused by the fluid changing direction or changes in pipe size. When a pipe suddenly changes size, you have entrance or exit losses which are types of minor losses. Head losses in locline could be calculated either as a series of minor losses (exit loss followed by an entrance loss followed by exit loss... every time you add another segment: less segments = less losses) or as friction losses with a VERY high friction factor. If you extend the pvc pipe as far as possible before changing to locline, you have only the minor losses associated with the pvc tee (much lower headloss than locline tee or wye) and the transition between the pvc and the locline (plus the losses in the locline itself). I would not put pvc 90s on the ends of the pvc before the locline, just put a threaded coupling. You will eliminate the sag and you should get much more flow.

 

[azbigjohn]

Your thought process was good, but you lost much more than you gained. Head losses are caused by several factors. The most important of which are "minor" losses and friction losses. The biggest contributing factor to either of these is velocity (which is why you should use the largest pipe that is reasonable for your application). Friction losses are pretty self explanatory and are caused by friction between the fluid and the walls of the pipe. Minor losses are caused by the fluid changing direction or changes in pipe size. When a pipe suddenly changes size, you have entrance or exit losses which are types of minor losses. Head losses in locline could be calculated either as a series of minor losses (exit loss followed by an entrance loss followed by exit loss... every time you add another segment: less segments = less losses) or as friction losses with a VERY high friction factor. If you extend the pvc pipe as far as possible before changing to locline, you have only the minor losses associated with the pvc tee (much lower headloss than locline tee or wye) and the transition between the pvc and the locline (plus the losses in the locline itself). I would not put pvc 90s on the ends of the pvc before the locline, just put a threaded coupling. You will eliminate the sag and you should get much more flow.

Sounds like a plan! Just need to get a 2nd loc-line threaded end.

Thanks again!

 

[azbigjohn]

Well, plan "B" worked. I still have a little too much play in the older threaded attachment, but the much shorter run makes it matter less!