flexible barrier pipe for tap connector hose?

[JohnD]

I want to take off a radiator and fit a magnaclean during a sludge-removal exercise

I understand that ordinary flexible hoses, such as washing machine hoses, allow oxygen to pass through, accelerating corrosion

is there a better alternative?

 

[oldbuffer]

1. If you are thinking of putting a Magnaclean between the flow (or return) connection of a radiator and the pipework:
1a. Assuming it is purely temporary, then it won't matter much what pipework you use.
1b. However, I doubt washing machine hoses are rated for central heating temperatures - most machines are cold fill.
1c. I would also doubt the crimped on plastic connectors would survive.
1d. Use JG Speedfit or Hep2O (or similar). You can get them in 3M lengths. Or copper.
2. Putting a Magnaclean in series with a radiator won't do anything for any other radiator or the system's pipework. Much better to fit one permanently on the return just before the boiler.

 

[Deleted member 267285]

Personally I’d use copper and compression tap connectors if what I’m understanding is correct, that you’re leaving the magnaclean in situ for a while?

 

[Justin Passing]

Washing machine hoses are great for mains-flushing, as they fit the (more common type of) rad valve union (3/4"). Not most TRV ones though. Either get a 1/2 to 3/4 bush or use a normal valve temporarily then you can fill though one and dump through the other. TRVs have tiny apertures in them do normal are better for this.
If you sketch out your system and turn boiler/ rad valves on and off etc, you can very effectively flush the system. If you have (air) in a rad and apply the mains, you can build up pressure, and then discharge at very high rate through one rad. It takes a little planning to do the lot efficiently. Don't forget the boiler is connected like a rad. It probably has iso valves, which quite often leak for a while afterwards - if not forever.

If you think about it, it's pushing down though the rad vertical channels if you start with air in it, which is good. That sludge can get bypassed in a normal flush if there's a clear channel along the bottom.

Any flush will leave the system full of oxygenated water so add an inhibitor.