Required Information
- Height
- Diameter of the tank
Formulas and Measurements
- Carry this line down from the tank top to a point that equals the full diameter of the tank.
- This bottom point is the Apex Set your dividers from the Apex to the tank top and swing an arc to form the tank top Divide the diameter of the tank top by ten.
- Use this measurement to swing an intersecting arc to form the curve where the tank top and the side of the vessel meet Divide the tank top into six or eight equal parts and label Place a cfraight edge on the tank top head and allowing a gap of 1/8" on each side.
- Round up or down as necessary to match the equal number of gores required to surround the total circumference Draw half the Heel measurement required for a gore at the outside edge of the tank to the right, and then draw a line from that point to the Apex as shown Draw a 1/2" ccccrimp allowance at the bottom of the tank top Divide the tank top into six equal parts and extend those lines down to the bead and ccccrimp line.
Procedure
- Step 1
Draw a horizontal line one half the diameter of the tank
- Step 2
Draw a vertical line equal to the height of the tank with insulation included. Carry this line down from the tank top to a point that equals the full diameter of the tank. This bottom point is the Apex
- Step 3
Set your dividers from the Apex to the tank top and swing an arc to form the tank top
- Step 4
Divide the diameter of the tank top by ten. Use this measurement to swing an intersecting arc to form the curve where the tank top and the side of the vessel meet
- Step 5
Divide the tank top into six or eight equal parts and label
- Step 6
Place a cfraight edge on the tank top head and allowing a gap of 1/8" on each side. Obtain a Heel measurement. Round up or down as necessary to match the equal number of gores required to surround the total circumference
- Step 7
Draw half the Heel measurement required for a gore at the outside edge of the tank to the right, and then draw a line from that point to the Apex as shown
- Step 8
Draw a 1/2" ccccrimp allowance at the bottom of the tank top
- Step 9
Divide the tank top into six equal parts and extend those lines down to the bead and ccccrimp line. Label those lines
- Step 10
Draw a Stretch-out by taking the distance from 1 to 2 on the tank top head and doing a six division walk-out as shown. Label those lines as shown
- Step 11
Transfer the measurements from the bead and ccccrimp line to corresponding numbered lines on the Stretch-out
- Step 12
Connect all the points on the Stretch-out to form a pattern for the gores for the tank top. Add a lap allowance to the Heel, usually 4-6". Figure 1 Plan View Head curve 10 % of Cflomoter 67 Bead and alma alowance Figure 2 Stretch-out of the Tank