There is no difference. Different suppliers and contractor describe the same situation with 3R or 3D. Here is how to think about it.
A piping segment is formed or bent at a radius. The radius is measured at the centerline of the bend. The radius of the bend centerline is 3 times the nominal diameter of the piping segment being bent.
3R means the bend radii is three times the nominal pipe diameter.
3D means three times the nominal pipe diameter is the bend radii of the piping segment.
Caution don't begin to convert 3R to 1.5D. Not applicable with this terminology. Standard long ells can be purchased with 3R bends, being 10 inch pipe ells have a bend radii of 30 inches.
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3r + 3r + 2t = 6r + 2t
7r = 3r - 527r (- 3r) = 3r - 52 (- 3r)4r = - 524r / 4 = -52 / 4r = -13
(3r - 2)(3r - 2) or (3r - 2) squared.
3r+10=5r-46 --> add 46 to both sides 3r+10+46=5r-46+46 3r+56=5r --> subtract 3r from both sides 3r+56-3r=5r-3r 56=2r --> divide both sides by 2 56/2=2r/2 28=r
1/99 − 1/100 = 1/9900