Flow problems on heating system

Discussion in 'Plumbers' Talk' started by bathroom boy, Jan 16, 2010.

  1. bathroom boy

    bathroom boy New Member

    Changed pump but still not good, 2 port valve suspect after pump,drained down and fitted valve, now this is where it gets wierd, I have drained and refilled many a system, anyway system refuses to fill, i suspect blockage in the f&e pipe, tried to blow out to no avail, spilt pipe prior to primaries and really filthy water came out not what you would expect from a system thats just been drained down,rodded out remaining, boxed it all up and managed to get downstairs rad (site of drain down) to fill, but still having problems filling upstairs rads, no movement of air when attempting to bleed.
    Will try and force fill it, I have worked on stuborn systems before but this is strange, system is approx 30yrs old with many original rads, could it possibly be sludge related? System is 22 primaries tapering down to 15m/m and 10m/m branches to all rads.
     
  2. Captain Leaky

    Captain Leaky New Member

    Sounds like a blockage! Have fun!
     
  3. bathroom boy

    bathroom boy New Member

    Thats what i,m thinking but where and how did it develop?
     
  4. Captain Leaky

    Captain Leaky New Member

    Youu drained down!

    Start at the top, check the first tee where the header tank joins the system.
     
  5. spongeblob

    spongeblob New Member

    Check to see if youve got manifolds on the circuit,these are a sod for blocking up,normally quicker replace/repipe. Once youve got that amount of ***** in a system,its better to repipe sections for customers benefit. Good Luck
     
  6. bathroom boy

    bathroom boy New Member

    Done that it's clear, some really dirty water came out
     
  7. bathroom boy

    bathroom boy New Member

    No manifolds just branches
     
  8. bathroom boy

    bathroom boy New Member

    Would a powerflush sort this out?
     
  9. spongeblob

    spongeblob New Member

    Not necessarily,like Leaky said check the cold feed,wont try and tell you how to suck eggs..but try a magnet on pipes,if it sticks then you know where the crud is,also worth bunging x800 in for a few days,then powerflush.
     
  10. EXPERTGASMAN

    EXPERTGASMAN New Member

    Would a powerflush sort this out?

    BB, the most likely area of problem is tbe connection of the cold feed into the system.

    There may be an air separator or just a tee. Use a magnet around these areas, and you may fin a pull. In any case, drain down and cut out section, and replace if necessary
     
  11. bathroom boy

    bathroom boy New Member

    Tried the magnate and sure enough return pipe to boiler is full of sludge, put a mains pressure hose on f&e pipe but nothing is moving, any suggestions.Thanks
     
  12. spongeblob

    spongeblob New Member

    x800 descaler,or repipe
     
  13. spongeblob

    spongeblob New Member

    God knows what the boilers like inside?
     
  14. bathroom boy

    bathroom boy New Member

    Return pipe to boiler seems to solid for at least a couple of yards, had drain cock above boiler open (which yesterday I thought was u/s)and hose on f&e at mains pressure just prior to tee, but totally blocked solid, looks like it's going to be a big job.
     
  15. spongeblob

    spongeblob New Member

    Just remember one thing!!!!! its not your fault,all you have to do now is get it working properly.Good Luck
     
  16. bathroom boy

    bathroom boy New Member

    Is there any way of clearing the blocked pipe or will it have to be cut out?
     
  17. HOTDOG ø

    HOTDOG ø Active Member

    cut it out, clearing it just moves the sludge somewhere else.
     
  18. bathroom boy

    bathroom boy New Member

    Would it not be cheaper to replace the whole system, it is 30yrs old, original rads probably full of sludge, cylinder coil is fed also in 10m/m and magnet picking up sludge in this also.
     
  19. doing a bit

    doing a bit New Member

    to clear a section of pipe try one of the drain clearing springy things, some attach to a drill, worth a go ??
     

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