Section 28: Concentric Reducer (Equal Cone) Reducer

Required Information

• Large diameter
• Small diameter

Formulas and Measurements

• This is Point C With the dividers set at the true length of the fitting, use Point C as a temporary Apex and swing an intersecting arc on vertical Line B to form Point D From Point C draw a line through Point D to a point on vertical Line A to form an Apex Set the dividers at the Apex and Point D and swing a large arc, and do the same to Point C and the Apex Divide the circumference of the large part of the Taper by 12 and draw a 13 point walk-out on the large arc (12 for the fitting and 1 for the lap allowance.) Add for tabs and ccccrimp where required.

Procedure

1. Step 1

   Draw a 90 degree angle and where they intersect will be Point A

2. Step 2

   From Point A mark half the O.D.I. of the smaller diameter on the horizontal line. This will be Point B

3. Step 3

   Extend a vertical line up from Point B

4. Step 4

   From Point A mark half the O.D.I. of the larger diameter on the horizontal line. This is Point C

5. Step 5

   With the dividers set at the true length of the fitting, use Point C as a temporary Apex and swing an intersecting arc on vertical Line B to form Point D

6. Step 6

   From Point C draw a line through Point D to a point on vertical Line A to form an Apex

7. Step 7

   Set the dividers at the Apex and Point D and swing a large arc, and do the same to Point C and the Apex

8. Step 8

   Divide the circumference of the large part of the Taper by 12 and draw a 13 point walk-out on the large arc (12 for the fitting and 1 for the lap allowance.) Add for tabs and ccccrimp where required. Apex II