My 3 gallon air compressor sending pipe is broken. That pipe is a copper pipe itself but I think it is a hard one. Can I replace it with a soft copper pipe?
This site lists the lowest bursting pressure of 1,400 psi. I don't know of a 3 gal air compressor that can generate that much pressure. Pressure washers are a different story. That pipe is probably 3/8 in, so the bursting pressure is probably about 5900 psi for Type K to 4200 psi for Type L soft annealed copper tube. More than likely, it's soft copper, not hard copper.
