15mm copper pipe suitable for compressor?

[jordan1]

I'm looking to distance my compressor further away from the spray booth and fit an extra drain point, will standard 8mm or15mm domestic copper pipe stand 150psi working pressure?.
Cheers

 

[brightspark]

I'm looking to distance my compressor further away from the spray booth and fit an extra drain point, will standard 8mm or15mm domestic copper pipe stand 150psi working pressure?.
Cheers

use 15mm rather than 8mm as u will loose volume using the thinner pipe .ive got soft soldered yorkshire fittings on my comp between the pump and the tank which gets quite hot and have been on it for over 30 years

 

[jordan1]

use 15mm rather than 8mm as u will loose volume using the thinner pipe .ive got soft soldered yorkshire fittings on my comp between the pump and the tank which gets quite hot and have been on it for over 30 years

Yes, but copper pipe is now 'thin wall' compared to what it was then.

 

[Luke]

I use 15mm copper pipe between my tanks and regulator. No issues in 4 years.

 

[jordan1]

Thanks guys 15mm it is then.
Cheers

 

[rikrobson]

I use a flexible tap fitting from compressor to pipe then the pipe hard into the regulator.
I was initial surprised that the tap fittings form B&Q were rated at a high enough pressure, but they are

 

[brightspark]

half inch anealed copper pipe type m thinwall internal working presure is 247psi @400farenite drawn copper type m int working presure is 776psi @400f thats providing it hasnt been heated and anealed by heating and soldering joints. so compresion fittings would be used at the higher presure

 

[mangocrazy]

I'd be surprised if soldering copper would heat it sufficiently to anneal it. I was of the opinion that copper annealing takes at least 400 deg C to achieve, and more normally at700-800 deg C. Most lead-free solders have melting points in the 220-240 deg C region, so soldering of copper pipe shouldn't result in it reaching the kind of temperature where annealing takes place.

IMHO, of course...

 

[rikrobson]

depends on how hard you heat it i suppose

 

[the artfull-codger]

I have 15mm copper from my compressors with no problems both soldered & compression fittings, annealing is usually by heating to dull red heat [which if you were soldering it would burn the solder & ruin the joint] & the classic myth is that after heating to anneal, you have to quench in cold water,which is untrue as it does nothing at all, except the thermal shock removes most of the oxide & you can hold it quicker!!

slan go fol

 

[brightspark]

I'd be surprised if soldering copper would heat it sufficiently to anneal it. I was of the opinion that copper annealing takes at least 400 deg C to achieve, and more normally at700-800 deg C. Most lead-free solders have melting points in the 220-240 deg C region, so soldering of copper pipe shouldn't result in it reaching the kind of temperature where annealing takes place.

IMHO, of course...

have u ever wached plumbers with a blowtorch and even more i neednt say more

 

[langy]

15mm copper has served me well, all soldered.

 

[mangocrazy]

have u ever wached plumbers with a blowtorch and even more i neednt say more

Quite, but if you're doing it yourself that shouldn't be a problem, should it? Besides, if you apply too much heat to a solder joint you kill it anyway.

I think even the most ham-fisted plumber would hesitate at heating copper to dull cherry red (which is the kind of temperature needed for annealing).

 

[Luke]

I use a flexible tap fitting from compressor to pipe then the pipe hard into the regulator.
I was initial surprised that the tap fittings form B&Q were rated at a high enough pressure, but they are

Yes, I use a flexible tap hose from the compressor to the solid pipework, seems like a good idea given that the compressor vibrates a fair bit.

I use compression fittings, some do leak ever so slightly, but the cost is outweighed by the convenience and reusability of the compression fittings.

 

[the snooper]

Yes, I use a flexible tap hose from the compressor to the solid pipework, seems like a good idea given that the compressor vibrates a fair bit.

they are supposed to be good for about 145 psi