Section 8: Equal Reducing Rubber 90 Degree Elbow

Required Information

• Insulation thickness

Formulas and Measurements

• Using that measurement, swing an arc to form Cut-line A Multiply the O.D. of the small pipe (insulation included) by Pi, and then divide by 2 and then add one inch.
• Label this Multiply the O.D. of the large pipe (insulation included) by Pi and then divide by 2, and then add one inch.
• Label this Draw a line from Point 1 to Point 2 and divide that line into two equal parts.
• This point is Apex B Set dividers from the Apex B point to number 1 and draw an arc to number 2 to form Cut-line B

Procedure

1. Step 1

   Draw a 90 degree angle

2. Step 2

   Square the fitting from weld to weld using a framing square. Using that measurement, swing an arc to form Cut-line A

3. Step 3

   Multiply the O.D. of the small pipe (insulation included) by Pi, and then divide by 2 and then add one inch. Mark this measurement on the vertical line, using Cut-line A as a starting point. Label this

4. Step 4

   Multiply the O.D. of the large pipe (insulation included) by Pi and then divide by 2, and then add one inch. Mark this measurement on the horizontal line using Cut-line A as a starting point. Label this

5. Step 5

   Draw a line from Point 1 to Point 2 and divide that line into two equal parts. Label that division

6. Step 6

   At Point 3 draw a 90 degree line perpendicular to Line 1 -2 to an intersecting point on the extended vertical line. This point is Apex B

7. Step 7

   Set dividers from the Apex B point to number 1 and draw an arc to number 2 to form Cut-line B