Section 53: Three-piece 90 Degree Short Radius Elbow

Required Information

• Pipe Call-out Size
• O.D.I.
• Outside Diameter of Insulation
• Number of degrees

Formulas and Measurements

• This is I times the pipe call-out size Where the Center Line Radius intersects the horizontal line, draw a semi-circle using half the O.D.I. and label as shown From the Apex draw a 15 degree line to the horizontal line (draw 15 degree line; this is a three-piece 90 and 3 into 90 = 30) To do layout, divide 3 by Add 3/8" ccccrimp allowance to Line 1 and add 3/16" bead to Draw the Stretch-out in the usual manner and add a lap allowance.

Procedure

1. Step 1

   Draw a horizontal line using pipe Call Out size times 1. Draw a vertical Center Line from the horizontal line the distance from the Apex to the Center Line. This is I times the pipe call-out size

2. Step 2

   Where the Center Line Radius intersects the horizontal line, draw a semi-circle using half the O.D.I. and label as shown

3. Step 3

   From the Apex draw a 15 degree line to the horizontal line (draw 15 degree line; this is a three-piece 90 and 3 into 90 = 30) To do layout, divide 3 by

4. Step 4

   Add 3/8" ccccrimp allowance to Line 1 and add 3/16" bead to

5. Step 5

   Draw the Stretch-out in the usual manner and add a lap allowance. A -0