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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
It's time to replace the 60-year-old buried water pipe that runs from meter to my house. It's nominal 3/4" galvanized steel, and developed an expensive leak very close to the house end. After that discovery, house water supply was switched to a garden hose connection from a gracious neighbor. Then back to my own water meter, through a kluge connection to old pipe upstream of the break.
I've been talking with plumbing contractors about digging up and replacing the whole 82-foot (25 m) run, which is about 18 inches deep in soil that never freezes. Directly-buried copper pipe is common around here, and that's what most of my shockingly-high bids are for. Most of my friends and family recommend PVC pipe to save money. Both are permitted by the 2016 California Plumbing Code and by my city (the AHJ = Authority Having Jurisdiction).
One contractor says he uses Schedule 80 (extra thick) PVC in new-house jobs all the time, and that it's better than copper. Last week I'd decided to go with Type K copper pipe, the thickest standard (0.065" wall). There are parts of the USA where Type K is mandatory for buried copper in domestic water service. But my local hardware stores and big-box stores carry only Types L and M (0.040" and 0.025" wall). I have 90 feet of 3/4" Type K waiting for me at Grainger in San Jose, at about $4.35 per foot, but the most recent contractor tells me it's a waste of money. He would upsize to nominal 1" type L, which he surely has tons of. I looked up tables of dynamic pressure drop, and he has a good point if I'll be using outdoor sprinklers for irrigation.
What's required, and/or used in practice, in other parts of the world?
Oh & by the way, copper pipe joints embedded or covered in concrete "shall be brazed using a filler alloy melting at not less than 1100° F."
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Here in UK we should insulate underground water pipes, however, I believe that medium density polyethylene tubing is current practice. no intermediate joints and no chemical leeching.
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Buried water pipe materials?
