Alpha22
Well-Known Member
Doing a little re-plumbing on the diesel lines on my boat. Whats best, copper or brass olives???
Why two different materials for the same job?
Cheers.
Why two different materials for the same job?
Cheers.
Copper or Brass Olives
- Thread starter Alpha22
- Start date
rafiki_
Well-Known Member
From first principles, copper will be easier to compress, but not as reilient as brass. It could be something to do with the piping material, and the pressure required to be held at the joint. Modern electronic high pressure fuel systems will need stainless steel piping, not the copper of years gone by. I'm not sure of the jointing methodology of these, but they may have to withstand 1800+ bar.
kashurst
Well-Known Member
I am assuming you are using copper or copper alloy pipe. You will be OK with either but I'd use brass as its a bit tougher and won't mind being disassembled a few times.
ccscott49
Well-Known Member
1800 bar??? 27000 psi? are you quite sure?
I know my injectors are set @ 175 bar, mebbes a zero too far?
By the way, they only need high pressure piping on the high pressure side, not the supply side.
Latestarter1
Well-Known Member
Ignore the comments regarding high pressures, safe to say that you are re-plumbing your supply or return lines correct?
Your question actually has me worried, yes you can get copper or brass olives for domestic copper tube and it actually makes little difference unless you want to mess with biodiesel and we do not want to go there do we. If you are considering small bore central heating copper tube, that is OK as it is thick wall, until you get to 15mm copper which is NOT as it is thin wall tube and has no place in a marine fuel system.
Domestic small bore compression fittings are just about acceptable, however if you want to do the job properly use Wade fittings http://www.wadefittings.com/page/wade-compression-fittings as they comply with BS 2051 Part 2
You have not mentioned the power of your engine, make sure that you do not use smaller diameter for supply or return than specified in manufacturers installation guidelines. Never forget that even if your engine was installed by original builder no certainty that they got it right in the first place!
rafiki_
Well-Known Member
Apologies for red herring, but you did not state what engine, or part of plumbing you are addressing. Modern commom rail or EUI engines use delivery pressures of 1800 - 2000 bar. If yours is not one of these, then thats fine. We can't be mind readers on here, and the more info you give, the better answer you will get.
Alpha22
Well-Known Member
My apologies for lack of detail.
It is the low pressure supply side. It is all 8mm thick walled.
The engine is a Bedford 330, so not exactly high tech.
When someone 'improved' the fuel system some time ago they put 'kinks' in some of the pipework. Also there are compression 'joiners' for no apparent reason. Potential leak points.
The plan is to replace the bits of pipe and joints with one pipe, bent nicely using tools, not hands!
Thanks for the input.
It is the low pressure supply side. It is all 8mm thick walled.
The engine is a Bedford 330, so not exactly high tech.
When someone 'improved' the fuel system some time ago they put 'kinks' in some of the pipework. Also there are compression 'joiners' for no apparent reason. Potential leak points.
The plan is to replace the bits of pipe and joints with one pipe, bent nicely using tools, not hands!
Thanks for the input.
