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Ex tanks problem

JobberJobber Member Posts: 7
Have boiler system with steel ex tanks. Pumping away from them with main pump but 4 boilers in the system have inducer pumps that pump towards the ex tanks. Has anyone seen this sort of set up? Having problems with ex tanks constantly water logging


  • TimcoTimco Member Posts: 2,826
    Air trol

    Do the tanks have those B&G Airtrol fittings with the tube that extends into the tanks?
    Working on steam and hot-water systems isn't rocket's actually much harder.
  • JobberJobber Member Posts: 7
    Air trol

    Yes they have airtrol fittings. Just thought it was odd that it is pumping away and towards ex tanks
  • TimcoTimco Member Posts: 2,826
    Air removal?

    Any air removal devises on the system?
    Working on steam and hot-water systems isn't rocket's actually much harder.
  • JobberJobber Member Posts: 7

    Yes there is a b and g in line air separator and the ex tanks are piped out he top of it and the feed water goes into the bottom
  • nicholas bonham-carternicholas bonham-carter Member Posts: 6,540
    Where's the air

    Where can the air in the tank go? Does it dissolve into the water?--NBC
  • JobberJobber Member Posts: 7

    That is a good question and the problem. I don't know where the air cushion goes but after a couple of weeks it's gone and the peg to off and the auto fill will put water in and the ex tanks need to be set
  • JobberJobber Member Posts: 7

    Suppose to say prv go off. Sorry
  • gennadygennady Member Posts: 680
    edited October 2013

    are those boilers piped as shown in attached diagram?
    Gennady Tsakh

    Absolute Mechanical Co. Inc.
  • JobberJobber Member Posts: 7
    Boiler piping

    Close but the booster pumps are on the supply side and it isn't primary secondary loop and it has steel ex tanks
  • VA_BearVA_Bear Member Posts: 50
    Automatic Air Bleeders

    Does the system have automatic air bleeders? Iron expansion tanks can lose air by redissolving air into the water and losing it from the air bleeders instead of recycling it back to the expansion tank, but that is usually a fairly slow process. Have you checked the tank and the air separator to tank piping for trace leaks, allowing the air to leak out above the water line? Dies the tank have a sight glass column? The valves are a common point of unnoticed air leaks when the valves are left open all the time as are the threads of the valve connections.
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