Required Information
- O.D.I.
Formulas and Measurements
- Do the same for the smaller O.D.I. on the right vertical line Draw a 90 degree vertical line between the 2 arcs and label it A Trisect or bisect the small arc into equal parts (in this case three) Draw parallel horizontal lines from the right bisected or trisected points on the 90 degree lines down to the Base Label the vertical Lines 1 to 4 starting at the Base Line, and extend those lines to the points on the small arc as shown in Divide half the circumference Into six equal parts and draw Line A at 90 degrees to vertical lines for the Stretch-out From Figure 3 set dividers on the Line A and Line 1 on the large arc.
- For the other half of the fitting add a lap For the body portion of the fitting, cut a piece of material half the circumference of the large O.D.I. and draw a Center Line as in From Figure 3 set dividers at Point 1 and Point 2 on the large arc and transfer this measurement to the Stretch-out as shown in Figure 3.
- Draw 90 degree lines on both sides of the Center Line through the points obtained and label those lines 1, 2, 3, 8 4 as in From Figure 3 set dividers at the Base Line and Point 4 on the large arc.
Procedure
- Step 1
Draw a Base Line with a 90 degree vertical line at each end. Plan enough room to draw the rest of the layout
- Step 2
Using half the O.D.I. of the large diameter insulation, draw a 90 degree arc on the left vertical line as shown in Figurel. Do the same for the smaller O.D.I. on the right vertical line
- Step 3
Draw a 90 degree vertical line between the 2 arcs and label it A
- Step 4
Trisect or bisect the small arc into equal parts (in this case three)
- Step 5
Draw parallel horizontal lines from the right bisected or trisected points on the 90 degree lines down to the Base
- Step 6
Label the vertical Lines 1 to 4 starting at the Base Line, and extend those lines to the points on the small arc as shown in
- Step 7
Divide half the circumference Into six equal parts and draw Line A at 90 degrees to vertical lines for the Stretch-out
- Step 8
From Figure 3 set dividers on the Line A and Line 1 on the large arc. Transfer this measurement to Line 1 on your Stretch-out. Do the same for the rest of the Stretch-out, by advancing to the next number up each time. For the other half of the fitting add a lap
- Step 9
For the body portion of the fitting, cut a piece of material half the circumference of the large O.D.I. and draw a Center Line as in
- Step 10
From Figure 3 set dividers at Point 1 and Point 2 on the large arc and transfer this measurement to the Stretch-out as shown in Figure 3. Do the same, but stepping up from 2 to 3, then 3 to 4. Draw 90 degree lines on both sides of the Center Line through the points obtained and label those lines 1, 2, 3, 8 4 as in
- Step 11
From Figure 3 set dividers at the Base Line and Point 4 on the large arc. Transfer this measurement to Line 4 on the Stretch-out in Figure 3. Do the same for 3 and 2. 1 is just to a point. Connect all the points to obtain half the hole cut-out for the other half of the fitting. Add for a lap. In some instances tabs may be required to lock the stem to the body