Is there a flexible pipe suitable for a secondary hot water circulatory system?

[BruceK]

I'd be grateful for some advice please.
I'm doing a stable conversion which requires a secondary circulatory system. The plumber (yes, he is qualified) initially didn't realise this and when questioned, didn't actually appear to know what a secondary system was! He did come back to install one though, but I've now discovered (just in time before the ceilings are boarded over), that the pipework he's fitted, using JG flexible pipe and fittings, is unsuitable for a secondary circulatory system. Replacing his runs in solid copper is going to be a nightmare because part of the system passes through I beams (so will involve lots of short lengths joined together). Does anyone know of a flexible pipe which would be suitable for a secondary hot water system so I can just pull it through to replace the JG stuff?
Thankyou in anticipation.

 

[cjg]

sorry, only used all copper for 2nd circulatory system.

 

[BruceK]

Thanks cjg. I've just read another thread on this site about it. It appears that a MCLP tube would be okay, though I'd prefer copper really.

 

[ShaunCorbs]

Mlcp is fine for src

 

[BruceK]

Mlcp is fine for src

Thanks Shaun. I was hoping it would be.

 

[ShaunCorbs]

Thanks Shaun. I was hoping it would be.

Just make sure it’s double / thick insulated min 25mm

Mlcp is all the best bits of copper in a flexible form

 

[fowlerboi]

My theory is that Polypipe claim their pipe isn't suitable, presumably from reading the literature because they don't want the pipework/fittings to remain at high temperatures continuously. They do say that even timer/thermostat controlled systems aren't suitable but I personally think they've just said that as a precaution. Or that there is something they can't achieve to get the suitable British standard

The same pipe is used to carry 80*c water for heating systems for long periods of time so I can't see how leaving a secondary return on for let's say 4 hours at 60*c in the evening would cause any damage.

Having said that. I'm extremely risk averse so wouldn't try it at a customers expense but would definitely setup a jig to try it if I can get my hands on some old/spare parts

 

[BruceK]

My theory is that Polypipe claim their pipe isn't suitable, presumably from reading the literature because they don't want the pipework/fittings to remain at high temperatures continuously. They do say that even timer/thermostat controlled systems aren't suitable but I personally think they've just said that as a precaution. Or that there is something they can't achieve to get the suitable British standard

The same pipe is used to carry 80*c water for heating systems for long periods of time so I can't see how leaving a secondary return on for let's say 4 hours at 60*c in the evening would cause any damage.

Having said that. I'm extremely risk averse so wouldn't try it at a customers expense but would definitely setup a jig to try it if I can get my hands on some old/spare parts

Thanks for the comments fowlerboi. Like you I can't see any justification for not using it but don't want to experiment in case it does go pear shaped. At least I can use the existing holes with MCLP so it's not all bad.