A rubber band is wrapped around two pipes as shown. One has radius $3$ inches and the other has radius $9$ inches. The length of the band can be expressed as $a\pi+b\sqrt{c}$ where $a$, $b$, $c$ are integers and $c$ is square free. What is $a+b+c$?

[asy]
size(4cm);
draw(circle((0,0),3));
draw(circle((12,0),9));
draw(3*dir(120)--(12,0)+9*dir(120));
draw(3*dir(240)--(12,0)+9*dir(240));
[/asy]
1. **Identify the components of the rubber band:**
   - The rubber band wraps around part of the circumference of each circle and stretches between the two circles.
   - The smaller circle has a radius of \(3\) inches.
   - The larger circle has a radius of \(9\) inches.
   - The centers of the two circles are \(12\) inches apart.

2. **Calculate the length of the rubber band around each circle:**
   - The rubber band touches each circle at two points, creating two arcs and two straight segments.
   - The angle subtended by the arc at the center of each circle can be found using the geometry of the problem.

3. **Determine the angle subtended by the arc:**
   - Let \(\theta\) be the angle subtended by the arc at the center of the smaller circle.
   - The distance between the points where the rubber band touches the smaller circle and the larger circle forms a right triangle with the radii of the circles.
   - Using the Pythagorean theorem, the distance between the points of tangency is:
     \[
     \sqrt{(12)^2 - (9-3)^2} = \sqrt{144 - 36} = \sqrt{108} = 6\sqrt{3}
     \]
   - The angle \(\theta\) can be found using the tangent function:
     \[
     \tan(\theta) = \frac{6\sqrt{3}}{6} = \sqrt{3}
     \]
     \[
     \theta = \arctan(\sqrt{3}) = \frac{\pi}{3}
     \]

4. **Calculate the arc lengths:**
   - The arc length on the smaller circle is:
     \[
     \text{Arc length} = \frac{\pi}{3} \times 3 = \pi
     \]
   - The arc length on the larger circle is:
     \[
     \text{Arc length} = \frac{\pi}{3} \times 9 = 3\pi
     \]

5. **Calculate the straight segments:**
   - The length of each straight segment is \(6\sqrt{3}\).
   - There are two such segments, so the total length of the straight segments is:
     \[
     2 \times 6\sqrt{3} = 12\sqrt{3}
     \]

6. **Sum the lengths:**
   - The total length of the rubber band is the sum of the arc lengths and the straight segments:
     \[
     \text{Total length} = \pi + 3\pi + 12\sqrt{3} = 4\pi + 12\sqrt{3}
     \]

7. **Identify \(a\), \(b\), and \(c\):**
   - Comparing with the given form \(a\pi + b\sqrt{c}\), we have:
     \[
     a = 4, \quad b = 12, \quad c = 3
     \]

8. **Calculate \(a + b + c\):**
   \[
   a + b + c = 4 + 12 + 3 = 19
   \]

The final answer is \( \boxed{ 19 } \)