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Discuss expansion pipe on a open vented system in the Central Heating Forum area at UKPlumbersForums.co.uk.

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  1. oldplumber john

    oldplumber john New Member

    Can you please tell me the possible problems caused by the vent pipe dipping into the F&E tank below the waterline.
     
    Last edited: Jun 30, 2016
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

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  3. joni os

    joni os Plumber

    Air lock on bend creating venting and filling problems, if pump on high point of system trapped air could cause noisy pump and early failure.
     
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  4. oldplumber john

    oldplumber john New Member

    have 12 rads on the system , 3 not working properly so I repiped the cold feed and vent too close couple 150mm behind the pump that is fitted to the primary flow pipe then into a threeport valve , when I fired up the system the vent and the coldfeed got hot ,I was wondering if the dipped vent into the F&E might have caused this heat up ? . it's an old system and i'm wondering now if there might be a sludge block to these rads , the flow to these rads get's hot so far but the return is cold , the pipework is all hidden in stud work and rises high but now iv'e resited the pipework it should push any air do you not think ?
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    pipes to rads in 10mm also there should be free space between the vent and water line
     
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  6. joni os

    joni os Plumber

    Keep the vent above the water and test with a pump you know is working correctly.
     
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  7. GQuigley67

    GQuigley67 Trusted Plumber GSR

    Make sure the pump is the right way around also, pump pumping the wrong way can cause the cold feed and tank to get hot.
     
    • Like Like x 2
  8. Millsy 82

    Millsy 82 Plumber GSR

    You can get gravity circulation up through the vent as in effect you have created a circuit for it to go round.
     
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  9. oldplumber john

    oldplumber john New Member

    Thank you all for your advice it's been of great use to me and has stirred the old grey memory bank
     
  10. Simon 45

    Simon 45 Member

    Hi
    Is it possible the radiators may need be re balanced, someone may haved adjusted the valves without your knowledge.
     
    Last edited: Aug 5, 2016
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