Water volume and pressure question

[check]

Avoid PVC in general. A continuous run of coil pipe flows best and will never give trouble.

I agree. PVC is an old technology that is past its time. PEX is so much better, withstands freezing, is so very flexible, and will last and last and not become brittle over time.

 

[charlz]

One advantage to PVC is gophers don't eat it... they love to munch on the black poly pipe... and probably PEX.

 

[Gary Fowler]

I agree. PVC is an old technology that is past its time. PEX is so much better, withstands freezing, is so very flexible, and will last and last and not become brittle over time.

Any time you have tubing that has to have a fitting stuck into it is going to slow down the flow. You would have to run 1" PEX to get a 3/4" flow thru it.
For my rock filled soil, I will stick to schedule 40 PVC and use the blue glue. It dries faster than the clear, a little water doesn't affect the joint either. It is especially effective when tying into existing lines that may tend to drip a bit of water when joining. I always hated trying to keep the kinks, dips and dives out of rolled tubing when laying it in a ditch.

 

[EddieWalker]

Make sure you have schedule 40. It does not come with belled ends, normally. The belled stuff is schedule 10 and schedule 20. It works fine for irrigation systems but the PSI rating is not for water service and it fractures real easy.

Ron

Not sure where you are getting your data, but 20 foot sticks of schedule 40 PVC is very common with the belled ends. I've installed thousands of feet of it and I've never heard of it not having the belled end to slide them together.

Schedule 40 PVC is the best choice for this application in my opinion, and if installed properly, will be there forever. Purple primer and heavy duty clear cement. Nothing else is as good for jointing them together. You don't actually glue them together, the purple primer actually softens the PVC and then the cement melts them together. Once cured, the joint is stronger then the pipe itself.

If he was going with larger pipe, like 2 inch or more, then the best choice would be pipe with gaskets that slide together.

I like PEX and would use it if the price was right for a continuous run. Black Poly is a low cost pipe that tends to fail more often then any other type of pipe in the ground. In my area, it's no longer allowed do to all the problems the water districts have had with it breaking. Remember, when the ground is wet and it freezes, it moves. Black Poly breaks after a few years and is a constant problem all winter long in areas it's been used.

Eddie

 

[RalphVa]

I ran 3/4" poly for 1100 ft to my garden down below and a "pumping station" for a 12v pump. I looked up the friction drop for a normal 1 to 5 gpm flow rate. It's insignificant.

3/4" is fine. I was a chemical engineer for 31 years. We did dozens of these type of calculations all the time.

Ralph

 

[charlz]

I like PEX and would use it if the price was right for a continuous run. Black Poly is a low cost pipe that tends to fail more often then any other type of pipe in the ground. In my area, it's no longer allowed do to all the problems the water districts have had with it breaking. Remember, when the ground is wet and it freezes, it moves. Black Poly breaks after a few years and is a constant problem all winter long in areas it's been used.

Eddie

That's interesting... does your ground typically have sharp rocks? Black poly is used a lot here for sprinklers... one advantage is if there is some water in it during the winter it will expand instead of breaking like PVC will.

 

[Egon]

U

Any time you have tubing that has to have a fitting stuck into it is going to slow down the flow. You would have to run 1" PEX to get a 3/4" flow thru it.
For my rock filled soil, I will stick to schedule 40 PVC and use the blue glue. It dries faster than the clear, a little water doesn't affect the joint either. It is especially effective when tying into existing lines that may tend to drip a bit of water when joining. I always hated trying to keep the kinks, dips and dives out of rolled tubing when laying it in a ditch.

A point restriction is different than a full length restriction.

 

[SPIKER]

One possibility is to add a pressure tank to the end of the line when you need higher flow for a bit, then it does it's thing and keep flow going for an extra few gallons.

M

 

[SPYDERLK]

Any time you have tubing that has to have a fitting stuck into it is going to slow down the flow. You would have to run 1" PEX to get a 3/4" flow thru it.
For my rock filled soil, I will stick to schedule 40 PVC and use the blue glue. It dries faster than the clear, a little water doesn't affect the joint either. It is especially effective when tying into existing lines that may tend to drip a bit of water when joining. I always hated trying to keep the kinks, dips and dives out of rolled tubing when laying it in a ditch.

A point restriction is different than a full length restriction.

Yaay Egon! :thumbsup:

 

[Billrog]

My choice would be shc. 40 PVC ( not the farmer one but the heavy one) or municipal tubing and mular (?) couplers the second choice the fittings are expensive but I have never had one fail and they can be easily loosened after many yrs. in the ground they are compression fittings and no restriction. If you plan on tying in more water lines to the run 1" would be a good choice for the main line other wise 3/4" will do .