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Discuss Problems with small bore pipe and an old central heating system in the The Welcome Wagon :) area at PlumbersForums.net

jh2254

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6
The small bore pipe to 4 radiators was completely clogged up. One radiator stone cold , others barely luke warm. Those plumbers that bothered to quote said ‘power flush’ but would not guarantee any success. So I tackled it myself, ripped up the floor boards and traced back the small bore that joined onto the 15mm pipe in the upstairs (under the floor boards). Opened the pipe from the 15mm to small bore connection and out glugged what you see in the picture - it was an inch thick! Bought some small guage garden wire and began rodding the pipes from the kitchen. Eventually managed to get the wire up 8 foot , but still no water flow. Then rodded down from above. After 5 hours of rodding each 8 foot pipe length I broke through ! Did this for all 4 radiators , both flow and return. I reassembled and ran cleaner through for 2 weeks. Drained and put inhibitor in. After a few days all 4 radiators clogged again !
So I fitted a magnaclean to the flow on one of the radiators and wow 🤩 what a difference it made to catching the magnetite before it entered the flow pipe into the radiators.
Now just got to attach another magnaclean to two other radiators that are served by the same bit of pipe and hopefully that will solve the problem.
The last radiator I will tackle later.
Fortunately I have enough space between the ceiling and the floor boards upstairs to fit a magnaclean (I dont use the drain hole in the magnaclean but a large syringe to empty the container and the magnaclean stands vertical no problem!).
Would appreciate forum members opinions on whether I should have done anything different ! Has this solution been used before!
And the answer was not to move house !
What a nightmare it’s been !
Thank you.
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oz-plumber

Esteemed
Plumber
Messages
3,067
Nice work.
With that much muck in the system, I would be keeping a close eye on the radiators.
They might start pinging leaks!!
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Messages
31,249
Solutions
2
X 800 in for a week and run the system then mains flush it out one rad at a time eg close all but one trv / lockshield and open a drain off etc
 

jh2254

Messages
6
Thanks. Yes I did use
X 800 in for a week and run the system then mains flush it out one rad at a time eg close all but one trv / lockshield and open a drain off etc
x800 for about 2 weeks but I should have done mains flushing of each rad. That’s where I think I went wrong 😑. I just closed one valve on each rad and then opened the drain valve and let it flush through at system pressure (gravity). Will need to do again I think. Thanks.
 

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