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What escutcheon size for 1 3/4" OD pipe? IPS confusion abounds

MotorapidoMotorapido Member Posts: 205
Help clear my confusion on the size of steam riser pipe escutcheon I need to order for risers measuring 1 3/4" OD. I'm not clear on the difference between IPS and nominal sizing. For instance, an amazon listing shows the following:
Floor and Ceiling Plate Split Flange, Fits 1-1/2 Inch IPS Galvanized Pipe or 2 Inch Copper Pipe.
What do I look for in product descriptions that will confirm that the flange escutcheon will be a nice, very close fit to the 1 3/4" OD of my steam risers?

Comments

  • JUGHNEJUGHNE Member Posts: 7,914
    Go to a big box or plumbing hardware store, pick up a 1 1/2" nipple, go to the section that might have the flanges. See how they fit.....maybe even buy them there while they are still in business.... before all the stores are crushed by Amazon. :|
    ethicalpaul
  • MotorapidoMotorapido Member Posts: 205
    Home Cheapo and Blowes were very limited in their selection. They had many tiny escutcheons in the tub/sink/toilet plumbing section, but in the iron pipe aisle, all they had in a larger size are marked as 2 inch, and they show way too much slop between the ID of the escutcheon and the OD of the pipe. When I look online, I see references to IPS sizes and to iron versus copper pipe. Very confusing. I'm ordering a boatload of them (cleaning up and preparing a rental property for sale and you gotta have pretty pipe escutcheons everywhere, right?) and I don't want to order the wrong size.
  • Jamie HallJamie Hall Member Posts: 14,943
    1 3/4 inch does not correspond to any iron pipe size. 1 1/2 inch iron is 1.900 inches in diameter. 1 1/4 is 1.690.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
    ethicalpaul
  • YoungplumberYoungplumber Member Posts: 279
    For copper add 1/8 to the nominal pipe size that's your od. There are many charts available online to look up iron pipe size od. For iron pipe size 1-1/4" you should be able to wrap your thumb and index finger around and have them touch but not by much. 1-1/2" won't quite touch. 2" won't even be close. 
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 8,123
    @Motorapido

    for 1 1/4", 1 1/2" and 2" the OD is "about" a 1/4" larger than the nominal size. The nominal size is "about" the inside diameter. There are plenty of charts you can download
  • EdTheHeaterManEdTheHeaterMan Member Posts: 1,636
    edited January 13

    1 3/4 inch does not correspond to any iron pipe size. 1 1/2 inch iron is 1.900 inches in diameter. 1 1/4 is 1.690.

    That depends on how many coats of paint are on the pipe. If it has been there long enough that 1-3/4 pipe might only be a 1/2" riser LOL :smiley:

    Order 1-1/4 and 1-1/2 from amazon and return the one(s) you don't use. Also, check out Supplyhouse.com They have a liberal return policy. (not a Democratic Liberal... Just Liberal the way we used to mean it)
    Edward Young
    Retired HVAC Contractor from So. Jersey Shore.
    Cleaned & services first oil heating system at age 16
    Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air

    If you make an expensive repair and the same problem happens, What will you check next?
  • MotorapidoMotorapido Member Posts: 205

    1 3/4 inch does not correspond to any iron pipe size. 1 1/2 inch iron is 1.900 inches in diameter. 1 1/4 is 1.690.

    So to put the question another way, for one-pipe steam, is the most frequently occurring OD of risers to radiators 1.90 or 1.69? My tape measure informed my lousy eyesight that the riser pipe measures 1.75. I'll guess that the pipe is then 1 1/4 IPS with a true OD of 1.690. Think that's correct?
  • Jamie HallJamie Hall Member Posts: 14,943
    Probably is. However, one simply can't say "the most common pipe size" for one pipe steam. The better installers used what was needed. Others used what was on the truck (or wagon!).
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • YoungplumberYoungplumber Member Posts: 279
    @Motorapido did you miss the part where I told you you could tell with your fingers? 
  • PC7060PC7060 Member Posts: 193
    PlumbingSupply.com has good selection with handy conversions for different pipe schedules
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