Square to Square Transition

Page 94

Square to Square

Transition

Information Required: Include insulation in

measurements a. small square dimensions,

b. large square dimensions, c. true height

Step 1: Draw both elevation and plan views.

On the plan view draw lines to the various

points as shown in figure 2 and label those

points as shown. Also on the elevation view

draw a center line dividing the fitting in half.

Step 2: From the plan view take

measurements from B-1 and transfer it to

the elevation view. This measurement is

placed on the horizontal line going from the

center line to the right. Do the same for

points A2 and A3. As this is an equal sized

fitting we only need to measure on quarter

of the fitting. Label these 3 points as shown.

Step 3: To start the layout, draw a line the

width of the large square, divide this line

into 2 equal parts and label as shown in

figure 3. From point B draw a 90-degree

vertical line, this will be the center line.

Step 4: From the elevation view set dividers

at slant height B1 and transfer this set to

the layout going from point B to an

intersecting point on the center line to form

point 1.

Step 5: Draw a 90-degree horizontal line to

each side of point 1. These lines to each

side will be half the dimension of a small

square side. The ends of these lines will be

labeled point 2.

Step 6: From both points 2, swing arcs to

either side using half the small square

dimensions.

Step 7: From the elevation view set dividers

at slant height A3 and transfer to the layout

using A as the apex and going to an

intersection point on the last arcs drawing.

Label this as point 3.

Step 8: Set dividers at slant height B1 and

swing arcs off to the side of point A using

point 3 as an apex. Then using half the

square dimension, set dividers at point A

and swing an intersecting arc to the last arc

drawn to obtain point C.

Step 9: Connect all points to form half the

fitting. For the other half add a lap.