Get a piece of filler wire and put half it's length inside the top of the pipe, call it the x-axis. Bend the outer half of the wire straight up to a 90 deg. angle, call it the y-axis. The angle measured from this y-axis to the face of the bevel is the bevel angle. Put another way, measure from the perpendicular line relative to the length of pipe, to the bevel. Industry standard is a 37.5 deg bevel. Now keep your bent filler wire handy and use as a gauge to check bevel angle. The angle of the wire is 90 deg minus the 37.5 deg = 52.5 deg.
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Measure the length of the pipe and the inner Dia of the pipe. 2 x pi x Radius x length is the inner surface area
They can measure the circumference of the pipe and divide it by pi or 3.14 to get an approximate answer
measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
2*pi*r*L where r is (outer) radius of the pipe (in case of the outer surface) nd L is the length of the pipe.
Reinforcing pads mirror the pipe that they are being welded to in size, thickness, and material. To measure the diameter of the pad, measure the pipe at a cross section.