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F&T's on wet return and dry return? Where else can we put one?

Double D
Double D Member Posts: 442
1-1/4" F&T on the wet return and 3/4" on the dry return. A little double trapping going on. Feed line bullheaded, high low fire burner on Webster vapor system using Pressuretrols. Ect.ect.ect. Time for some Vaporstats.


  • MilanD
    MilanD Member Posts: 1,160
    edited January 2018
    I suggest throttling down the make-up from the condensate receiver tank if it's wired to a float on the boiler. This will prevent steam from collapsing on intro of make up water, and keep the boiler steaming and the op pressure constant. I've done it on our lgb7. Keeps the gauge pegged to 4 oz regardless of the call for water pump.
  • Steamhead
    Steamhead Member Posts: 16,714
    Assuming the radiators have traps, you don't need an F&T on the dry return. If there is steam in the dry return, fix the bad radiator traps or crossover traps (if used).
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • Sailah
    Sailah Member Posts: 826
    Is the trap in the first pic on left a Trane 66CL?
    Peter Owens
  • Double D
    Double D Member Posts: 442
    @MilanD I do plan to throttle the tank down. I did mention it to the owner. There is a ball valve being used for throttling now but when I arrived it was wide open. I suggested a globe valve along with a swing check to replace the spring check presently there. I also mentioned there may not be a need for the tank at all.

    @Steamhead The radiators all have traps. I did mention the F&T should not be there, this is a case of double trapping but the owner said he does get steam coming out of it. I did do a quick search for crossover traps and didn't find any but I will need to go back and do a thorough search. There is also an F&T on the wet return.

    @Sailah The trap in the first pic is a 1-1/4" Hoffman 57 on the wet return. There is a 3/4" Hoffman on the dry return in the 4th pic.
  • Sailah
    Sailah Member Posts: 826
    Oh ok I thought it looked like a trane 66 and was going to say those need to be orientated differently. But the pic was a little blurry so I couldn't see it was a Hoffman. Carry on!
    Peter Owens