Lochinvar Noble NKC-199 leak at pump connection

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Le John
Le John Posts: 251
in THE MAIN WALL

Hello all. What type of gasket does the grundfoss pump connections use. There is a leak on the inlet side side of the pump right at the threads. I’ve tightened the brass nut but it still leaks.

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Comments

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Posts: 4,902
    edited November 14

    It's probably a flat, fiber gasket.

    If you don't have a replacement handy, remove it and if it's in decent shape, coat it with a thin layer of teflon dope and replace it. Also check the mating surfaces of the pump and opposing flange to make sure they're smooth.

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    Le John
  • hot_rod
    hot_rod Posts: 28,756

    most likely a fiber washer They are a compression set material and not really reusable once they are compressed.

    In a bind you could remove, dry and try a thin pipe dope coating

    That looks like a composite body circulator so you don’t want to crank too hard on it

    That also looks like the 1” size G thread I have used rubber water meter gaskets as a replacement. Find them at plumbing and Ace hardware

    IMG_3606.jpeg

    Or get a piece of gasket material from an auto part and use an Exacto knife to cut a new gasket. They have Fel-Pro fiber, or some red rubber material

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Alan (California Radiant) ForbesLe John

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