I installed a heating oil line recently. Code required type L or M (not refrigeration) tubing, and flare or soldered fittings. I used some 1/2" OD Type L, and in one place I used a flare fitting. I've done flares on soft tubing before, but doing this tubing was hard as heck. It took a lot of torque to get a flare, and the flare was prone to crack or come out off-kilter. It took several tries to get a halfway decent flare. Unfortunately, halfway decent was not enough, and the fitting has developed a slow leak. Am I doing something wrong? Can type L be flared? Does it need to be annealed somehow first? Do I need a better tool (the one I have is a fairly cheap tool)? Or should I solder on a short piece of soft tube and flare that?
Thanks,
Kelly