Copper or iron pipe?

[julianf]

re: brass

isnt DZR brass supposed to be better in chemicals?


Wikipedia -

Corrosion-resistant brass for harsh environments[edit]

Brass sampling cock with stainless steel handle.
The so-called dezincification resistant (DZR or DR) brasses, sometimes referred to as CR (corrosion resistant) brasses, are used where there is a large corrosion risk and where normal brasses do not meet the standards. Applications with high water temperatures, chlorides present, or deviating water qualities (soft water) play a role. DZR-brass is excellent in water boiler systems. This brass alloy must be produced with great care, with special attention placed on a balanced composition and proper production temperatures and parameters to avoid long-term failures.

No mention of bio and veg oil though.

[Soft top]

After 26 days........
From the left,
1. Bio with nothing in for reference.
2. Bio from same batch. Has a very slight hint of green which appeared within 2 days of inserting fitting but did not increase after that.
3. WVO. Went very green within a few days. It looks a bit clearer now but there is green slime on bottom of jar and on the fitting.
4. After my last post (11 days ago) I put a brass fitting into bio from the same batch. No change.

After looking at the samples I am happy to use the copper that I have. The bio that will be standing in the pipes will be from batches with a clear pass and will only sit in the pipes for a max of 2 weeks at a time. It seems that green slime is produced from something in wvo.

[rbdazza]

For what its worth I have a mixture of copper pipe and 'plastic' pipe on the bottom of my storage tank which have had bio sat inside them for over a year (obviously the bio is continually refreshed but they are always full) and the bio comes out the nozzle crystal clear still.

[slabster]

The main issue of material compatibility is the effect on the product. Worth testing the fuel I think.

Slabs