Pex Tubing

  • We are currently upgrading MFK. thanks! -neo
Dan Feller;3428503; said:
The difference is in the fittings. ABS and DWV PVC fittings are considerably different from PVC, CPVC, or PEX fittings.

In drain fittings tees and wyes are directional, they have an "up" and "down" (except clean-out tees, which are omnidirectional). Ells come in long, medium, and short radius sweeps. There are also specialized drain fittings such as a low-heel tee and various flanges.
Again,10 years in a plumbing warehouse,I know all of this.The warehouse I work in sells CPVC drain fittings.
This thread however,is not about drainage.
 
fishbum;3428536; said:
Again,10 years in a plumbing warehouse,I know all of this.The warehouse I work in sells CPVC drain fittings.
This thread however,is not about drainage.

You're right, sorry for the derail, but I had never heard of CPVC drainage fittings before. I looked them up and Spears does make "LabWaste" CPVC Corrosive Waste Drainage System, but that's pretty specialized stuff and pretty darned expensive. It would be a special-order product at any of the local plumbing supply outlets around here. You learn something new every day!

Again, my apologies to the O.P. for the derail. PEX is the best product out there for water supply in most pressure systems.
 
To derail this even further,I have seen Crestline CPVC drainage fittings as well.Just smaller ones,1/2" and 3/4".I'm not sure what those would be used for.But I can't seem to find any info on them.I haven't seen them for a while,so maybe they have been discontinued.
We happen to carry the acid,or lab waste fittings(Spears),and sell them on a fairly regular basis.
 
I still think that pex would be best for an open wall in a fishroom.

And I think I've seen fittings for cpvc. All that the chlorine is put in for is so that it makes the pipe more flexible and brittle and less prone to cracking.
 
Sheesh:chillpill:
If I had not had and still have, nothing but good experiences with CPVC, I would never have brought it up. I would not suggest anything I have not personally used and had success with.

To write this off as crap, and of no use in any form..Well, that is just being silly and of no value in a discussion among adults.

Previous personal experiences, pointing out any shortcomings you have encountered would be a benefit for me as well as any others looking to this forum for advice.
 
KaiserSousay;3439778; said:
Sheesh:chillpill:
If I had not had and still have, nothing but good experiences with CPVC, I would never have brought it up. I would not suggest anything I have not personally used and had success with.

To write this off as crap, and of no use in any form..Well, that is just being silly and of no value in a discussion among adults.

Previous personal experiences, pointing out any shortcomings you have encountered would be a benefit for me as well as any others looking to this forum for advice.

Sorry, I thought I had mentioned the problems associated with CPVC.

To be more clear:

Benefits of CPVC:
*Cheap
*Widely available at hardware/home improvement stores (pressure fittings and pipe)
*Relatively easy to work with

Drawbacks of CPVC:
*Weak joint strength
*Prone to crack/shatter over time as it becomes brittle
*Less flow for a given nominal size (PEX shares this drawback)
*Much less rigid than PVC

Benefits of PEX:
*Extremely strong and durable
*Very nonreactive, especially when using plastic fittings
*Flexible
*Available in straight lengths or coiled

Drawbacks of PEX:
*Cost
*Requires specialized tools (except the "push-in" type fittings, which are very expensive and less reliable than insert fittings)
*Less than full flow due to small I.D. and insert fittings

I hope this helps! :)
 
Dan Feller;3440059; said:
Sorry, I thought I had mentioned the problems associated with CPVC.

To be more clear:



I hope this helps! :)

Thank You
 
Dan Feller;3440059; said:
*Less than full flow due to small I.D. and insert fittings

I know you are meaning that in general but......


Behind a fishwall it wouldn't really matter how big the pex is because it wouldn't be ran through a framed wall.

Also in most houses water lines are ran through ceilings and floors and then vertically through the wall studs so size as long as its smaller than 2" o.d.

Atleast I would think so i'm not contractor or engineer.
 
Darkness9876;3441026; said:
I know you are meaning that in general but......


Behind a fishwall it wouldn't really matter how big the pex is because it wouldn't be ran through a framed wall.

Also in most houses water lines are ran through ceilings and floors and then vertically through the wall studs so size as long as its smaller than 2" o.d.

Atleast I would think so i'm not contractor or engineer.

Yes, I meant for a given size tubing.

The nominal size for copper and PVC is the actual I.D.. For instance 1/2" PVC or copper has an inside diameter of one half inch.

CPVC and PEX are designed to have the same O.D. as copper but have a greater wall thickness. Therefore 1/2" CPVC or PEX has an inside diameter of less than one half inch.

The flow is reduced further by PEX insert fittings, a 1/2" PEX fitting has an I.D. of only 11/32", a 3/4" PEX fitting has an I.D. of just over 1/2".

You're right that you can always go up a size, but the cost goes up, too.
 
I hate things that are measured diffrently. Really!

Like exhaust tubing!

But As i said in a fish wall it would prolly work.

In old construction it would be a pita!
 
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