Plumbing question

BlueAbyss · #1 05-28-2009, 08:29 AM

Quote:

Originally Posted by Myka

Personally, I will use vinyl tubing for my drain lines, but not my return lines. I don't like to use them for anything with any pressure as I've had them pop before, even with clamps. I use them without clamps on the drain though.

Hmm, this is something I hadn't considered. I wanted to have a section of flexible tubing on my 'return'... did the tubing pop, as in come off the barbs even with the hose clamps, or pop as in tear through the sidewall?

Myka · #2 05-28-2009, 04:45 PM

Came off the hose barb, clamp and all. Since the hose barb is plastic you can only get it "so" tight without cracking it, plus the walls of the 1" tubing are very thick. I had to heat the tubing in boiling water to even get it over the hose barb, and then clamped the crap outta it. I tried removing it once, and couldn't get it off without boiling water, and couldn't exactly get that in the right place!!

I gave up, and the return pump blew it off for me! Not good. There was a lot of back pressure though because there was a ball valve holding back the return pump. There's no way the sidewall would tear. It's really thick.

mike31154 · #3 05-28-2009, 05:12 PM

One thing to keep in mind with the clear vinyl is that any light source will promote 'growth' inside the line, requiring periodic cleaning. This is ok as long it's accessible, which in most situations should be the case. On the other hand, you 'can' see what's going on inside the vinyl tubing as opposed to pvc or other tubing, where it's a mystery until there's a problem.

golf nut · #4 05-28-2009, 06:44 PM

Also be very careful with math, a typical 3/4 barbed fitting doesn't have a 3/4 hole in it, I just measured one at.566 inside diameter that is a huge restriction when it comes to choking a 3/4 outlet pump. almost a 50% loss.

NHRA · #5 06-10-2009, 04:51 AM

When I built my system I used rigid 1' PVC and a very flexable and reenforced PVC. No hose clamps were required on the flexable PVC to nylon hose barb connections. This system has been running for a year and a half without even a drop leaked. The hose is a little expensive but I feel well worth it. It also has a bend radius of 3" for the 1" with no possibility of collapsing.

www.greenlinehose.com part#G941BW-100 for 1"

banditpowdercoat · #6 06-10-2009, 05:02 AM

Quote:

Originally Posted by Mr OM

Also be very careful with math, a typical 3/4 barbed fitting doesn't have a 3/4 hole in it, I just measured one at.566 inside diameter that is a huge restriction when it comes to choking a 3/4 outlet pump. almost a 50% loss.

3/4" NPT ID, .755" 50% less .375 3/4" barbed fitting ID .566. It's more like 30% less, but who's counting HAHAHA

golf nut · #7 06-10-2009, 01:26 PM

Quote:

Originally Posted by banditpowdercoat

3/4" NPT ID, .755" 50% less .375 3/4" barbed fitting ID .566. It's more like 30% less, but who's counting HAHAHA

You might want to do the Math again Dan, you are dealing with areas, it is a 43% reduction.

I know 3/4 is half of 1 1/2 but when it comes to pipe and volume the 3/4 will reduce the flow of a 1 1/2 pipe by 75%.

banditpowdercoat · #8 06-10-2009, 02:17 PM

OK, Paul, Ya, your right... DOH. I wasnt thinking pipes HAHA. Couple to many Adult beverage's last night