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Thread: Replacing old galvanized water supply line from meter to entry at house

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    DIY Senior Member k9mlxj's Avatar
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    Default Replacing old galvanized water supply line from meter to entry at house

    Hi there,


    Was looking into some irrigation issues earlier this week. Some folks suggested I still have old galvanized water supply line underground going from the water meter by the side strip area outside the house to the entry in the backyard at my house. Changing that old pipe out would remove the restrictive flow along that pipe due to rust in the galvanized pipe and restore water pressure to my house.

    The total run from the water meter to the current entry pt in the backyard is 60 ft. Will be under the concrete in the last 7 feet and one 90 degree right turn for another 7 ft (underground), and there'd be a switch right after it comes up above ground next to the stucco wall just outside the garage.


    Couple of questions:

    - I wonder how far down does the water supply line go under the dirt? I see at the water meter perhaps it's a feet or two under. Does it go down deeper as the galvanized pipe goes thru' the sidewalk and into the backyard area of my house?

    Or it stays around 2 feet deep under the ground level and heads straight into the house?


    - what kind of pipe material would folks recommend to change out to? I talked to a plumber. He preferred heavy gauge 1" copper pipe as the supply line over Schedule 80 PVC. Any recommendation of one kind over the other? Is black polyethylene ABS? And, what'd be needed for either material (which kind of copper, which kind of PVC/CPVC, what kind of joint/solder, etc.)?


    - I overheard there's some kind of machine where plumbers can use to pull the existing galvanized pipe out and insert new water supply line at same time w/o digging out from the dirt. Perhaps someone knowledgeable can explain a bit how this works?

    The last 14 ft (see 2nd paragraph) before it gets into the entry of the house it'd be under concrete. Would this machine work, or the concrete would need to be cut to open up this area to replace the galvanized pipe?


    I overheard there's a machine folks use to dig up trenches for irrigation piping. I wonder if that machine can also be used to dig up the dirt to expose the galvanized pipe. So no need for hand digging?



    Here is the current local plumbing city info:

    http://www.sanjoseca.gov/DocumentCenter/View/1770
    http://www.sanjoseca.gov/DocumentCenter/View/10321


    Thx much... .

    If a galvanized water service is removed, the electrical panel must be grounded first

    http://www.kirklandwa.gov/depart/Fir...PageMode=Print
    Last edited by Terry; 06-21-2013 at 10:02 AM.

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