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["Lynda" <lurine AT softcom.net>]

Well, I went to the "tutorial" and then asked DH (landscape designer and 
irrigation specialist) about it because it didn't sound right.

You do NOT want to use Class 200, or Class anything.  It is known in the 
industry as "eggshell."  Lot of sunlight, using a saw without holding your 
mouth the right way, if buried, someone or something (critters) walking on 
top of it and it will crack.  It doesn't last, it won't take pressure.

Around any of the bigger valves (3" and up), use a Schedule 80.  The rattle 
from the bigger valves when they turn on (they shake, hard!) will crack the 
Schedule 40 over time and sometimes over very little time.

Lynda
----- Original Message ----- 
From: "Gene GeRue" <genegerue AT ruralize.com>
> So you, too, oversize pipe. I wonder what percentage of us do. I ran
> two-inch up to the barn, from whence it will go up the hill to a
> storage tank for gravity feed. I am right now studying sizes and
> capacities. While I typically oversize on the theory of bigger is
> better and who knows if one forgot to take some factor into
> consideration and who knows what future use might change the
> requirements, I am about to install about six hundred feet of pipe
> which, plus fittings and about a dozen hydrants, which adds up to a
> fair piece of change, so I am doing a bit more research with an eye
> to not going too far overboard.
>
> At: http://www.irrigationtutorials.com/sprinkler22.htm I just learned
> that Schedule 40 has a wall thickness that diminishes capacity.
>
>
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