I'm running a part of my "irrigation" with a hose and some couplers and
some sprinklers. It's way out of hand -- too many couplers, too many
sprinklers (but they're needed to cover the area). I cut back on manual
labor by getting some cheap end-of-season timers and setting them to
kick on and off at 15-minute intervals, but I've got an unreasonable
mess of hoses.

I think I want to lay a plastic pipe on the ground in the arc that the
lawn runs in, and put in tee-couplings every 4-6 feet, and then wherever
I want a sprinkler I can put on a cheap faucet or a simple hose tap and
run, say, six feet of hose instead of fifty. Lots less confusion, and
much easier to deal with when I need to mow the lawn around there.

I've never used PVC for this -- how can I figure out what size PVC to
use, is there a standard way to couple a hose to feed this main pipe,
and is there a standard way to fit the hose taps in along the way?

The whole stretch is a long hose-run away from my house, so I already
have an electric boost-pump that furnishes the area with about 90 PSI of
hose pressure, although not at very high volume. The hose out there is
3/4". So, I need to make sure that whatever I cobble together won't
explode into component parts when I put 90 PSI into it, with some
additional allowance for pressure increase when the pump is turned on.

Thanks for suggestions!

Edward