(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 4 of 4

Thread: Piping type for recirc lines

  1. #1
    Home Builder ckl111's Avatar
    Join Date
    Apr 2009
    Location
    Ontario
    Posts
    65

    Default Piping type for recirc lines

    Do recirc lines require the copper pipes to be thicker? Type M or Type L ?

    I was wondering if the constant movement of water would slowly corrode pipe faster.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,679

    Default pipe

    It will, but mainly because the return circulation pipe is usually smaller so its velocity it higher, unless you install a valve BETWEEN the pump and heater, NOT BEFORE the pump, and close it until you have just enough flow to keep the line warm.

  3. #3

    Default

    How quickly might one expect errosion to penetrate the wall of copper tubing? In my proposed re-circulating system I'll be using Type L, 3/4" return line in a gravity flow system.

  4. #4
    Plumbing Designer FloridaOrange's Avatar
    Join Date
    Dec 2005
    Location
    SW Florida
    Posts
    1,317

    Default

    You should be fine with the 3/4" type L.

    I was just reading an ASPE article yesterday on recircing systems. The author recommends not going smaller than 3/4" due to velocity and using balancing valves to control the flow as hj suggested.

    Curious, on plans I always call for Type L copper for the water lines (when specifying copper anyway), do you typical use Type K?
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •