Hi I've just registered and it seems odd that I am also a Phil H,
I appreciate that this thread is a few months old but I think I have something to contribute.
I'm in the process of picking up model engineering after many years of building a Minnie which is all but complete. My aim is to finally build the boiler that was first attempted in 1973, there was a lot less information about then. I eventually bought a boiler from AJ Reeves (then in Moseley Birmingham – for which I no longer have the receipt) to overcome a stalled start. I will be joining my local ME society to get oversight of the boiler build, and meet like minded people, but for now, I am doing all the research to sort out a process for building my boiler, making various test pieces to confirm the methods before committing to the actual expensive build.
This lead me to your forum as I was searching for boiler tubes; having <> 20m of 10mm tube in my possession stamped "EN1057 (Kitemark) Streamline GB / Blue Label 10*0.7mm" & date stamped 3/09. The tube was purchased from Screwfix to relocate a radiator (I can locate the receipt in my old accounts). Being an ex BSI Assessor, I took the time to look-up the Blue Label spec. associated with the tube from Mueller Industries – this link (from Google) is actually a Jewson document – link http://assets.jewson.co.uk/product-docs/12341/12341.pdf, but refers to this tube – no doubt supplied to numerous plumbers merchants. Now this document appears to confirm Neil's post as the correct material – seamless 0.7mm wall CW024A tube. I took a sample of the tube, flattened it and it checked out at 0.7mm or 0.0275" or all but 22swg (0.028"
as required by the drawings. Being slightly larger than 3/8" I've made a simple reducing tool to form a short 3/8" diameter step at the end of a10mm tube, this eliminates reducing the wall thickness of the 3/8" 22swg tube to make a step to stop the tubes falling through partially reamed holes in the plate whilst silver soldering, I can simply ream the holes 3/8". I'm now at a loss as to how to proceed. If I buy tube it will be the same stuff as I have in my loft gathering dust, but will it have stamped identification on it?
PJH