Section 29: Layout for a Cone or Taper

Required Information

• O.D. of Large insulation O.D. of Small insulation Length of fitting

Formulas and Measurements

• Label these Points A-G as shown Draw lines from these points to the original Apex point Establish Point G for the Stretch-out and swing arcs from Points F, E, D, C, B, and A using the original Apex as your swing point Set the dividers from 1 to 2 on the semi-circle and take this set to Point G and mark a point on Line F.

Procedure

1. Step 1

   Draw an elevation view and establish an Apex by drawing lines from both outside diameter lines to a point. This point is the Apex

2. Step 2

   Draw a half-circle on top of the elevation, trisect and label

3. Step 3

   Using Point 1 as a temporary Apex, swing arcs from all the numbered points of the semi-circle to points on the horizontal line of the large diameter fitting. Label these Points A-G as shown

4. Step 4

   Draw lines from these points to the original Apex point

5. Step 5

   Establish Point G for the Stretch-out and swing arcs from Points F, E, D, C, B, and A using the original Apex as your swing point

6. Step 6

   Set the dividers from 1 to 2 on the semi-circle and take this set to Point G and mark a point on Line F. Continue this walk-out and Step down one letter each time until you reach the Line A, then Step up one line at a time until you reach the Line G

7. Step 7

   Measure the slant heights of each lettered line and transfer these measurements to the corresponding lettered lines

8. Step 8

   Connect all lettered and slant height points to form the fitting

9. Step 9

   Add for ccccrimp and lap allowance where necessary