Dumb Plumbing question

[jason the filter freak]

Whats the diffrence between schedule 80, schedule 40? What does it mean to me in terms of reef equipment?

[lanman]

Whats the diffrence between schedule 80, schedule 40? What does it mean to me in terms of reef equipment?

 

I bet Dandy knows!

 

bob

[dandy7200]

lol^

 

"Schedule" refers to the thickness of the pipe wall and, therefore, how much pressure it will hold, or in our low pressure environments how much abuse it can take without breaking.

 

Schedule 40 is rated for 140 psi.

 

Schedule 80 is rated for 200 psi.

 

The outside diameter (O.D.) is the same on Schedule 120, 40 and 80, so an expensive Schedule 80 fitting could be used on Schedule 120 or 40 pipe, if that's all that was available. As the wall of the pipe gets thicker, the inside diameter (I.D.) gets smaller. With fittings, the outside diameter gets larger.

 

Heres a nice chart with and probably way more information than you need but it comes in handy sometimes especially when you need to make your own fittings.

 

ASTM D1785

[jason the filter freak]

So would that matter at all on a set of drains, or olny returns for a closed loop, even on a closed loop I couldn't see ending up with 200 psi... or am I just not seeing the whole picture here

[Black Mammoth]

You would be fine with Schedule 40. The problem is that most big stores carry everything in 80. Usually I can't find all the parts I need in 40. To give you another idea, your water lines in your house run around 60psi. Most lines are either CPVC or copper. Your drain lines are out of PVC.

[dandy7200]

With our setups we are more concerned with lateral force than internal pressure. Thick wall = strong.