Note this version of the analysis is taking into account how much of each type of barb is in the device. All probabilities in tables and the Red plane 3D plots are the combined probabilities that no one of that Barb type will fail.
4 large pump barbs in the device
The above plot shows all of our data points temperature and pressure are on the x and y axis. While the z-axis is how long the barb lasted (in days) without a failure, the higher the better. Because we didn’t run the test indefinitely we have some test barbs that never failed, they are marked in Red, the rest are in blue.
The purple/blue/yellow plane represents the models best guess at how long barbs will last for different temperature and pressure conditions. I only showed the plane for high pressures and high temperatures because the model quickly starts to predict that the barbs won’t fail for years. This makes it so that you can’t see the differences in our experiments. For example the below graph will give the models “plane” predictions for lower temps.
The below table shows the probability of all 4 of the Large Pump barbs lasting 3 years under different temperature and pressure conditions.
| Temperature (°F) | Pressure (PSI) | Years | Probability of No Failure |
|---|---|---|---|
| 80 | 15 | 3 | 0.976 |
| 88 | 15 | 3 | 0.943 |
| 95 | 15 | 3 | 0.883 |
| 80 | 18 | 3 | 0.967 |
| 88 | 18 | 3 | 0.925 |
| 95 | 18 | 3 | 0.848 |
| 80 | 20 | 3 | 0.960 |
| 88 | 20 | 3 | 0.910 |
| 95 | 20 | 3 | 0.819 |
The below plot shows the probability of all 4 of the large pump barbs lasting 3 years under different temperature and pressure conditions. Here higher is better, please, please keep in mind that the z-axis is only showing you a specific range
2 bottom interface barbs in the device
All of the graphs are the same type as the large pump barbs, so I won’t go into detail on how to read them again.
| Temperature (°F) | Pressure (PSI) | Years | Probability of No Failure |
|---|---|---|---|
| 80 | 15 | 3 | 0.993 |
| 88 | 15 | 3 | 0.985 |
| 95 | 15 | 3 | 0.968 |
| 80 | 18 | 3 | 0.991 |
| 88 | 18 | 3 | 0.980 |
| 95 | 18 | 3 | 0.957 |
| 80 | 20 | 3 | 0.989 |
| 88 | 20 | 3 | 0.975 |
| 95 | 20 | 3 | 0.949 |
2 One-way barbs in the device
| Temperature (°F) | Pressure (PSI) | Years | Probability of No Failure |
|---|---|---|---|
| 80 | 15 | 3 | 0.998 |
| 88 | 15 | 3 | 0.996 |
| 95 | 15 | 3 | 0.991 |
| 80 | 18 | 3 | 0.998 |
| 88 | 18 | 3 | 0.995 |
| 95 | 18 | 3 | 0.988 |
| 80 | 20 | 3 | 0.997 |
| 88 | 20 | 3 | 0.993 |
| 95 | 20 | 3 | 0.986 |
4 Test chamber barbs in the device
We assume that the test chamber barbs are the same as the Bottom Interface barbs. They have similar designs and behaved similarly in our phase 1 testing.
| Temperature (°F) | Pressure (PSI) | Years | Probability of No Failure |
|---|---|---|---|
| 80 | 15 | 3 | 0.987 |
| 88 | 15 | 3 | 0.970 |
| 95 | 15 | 3 | 0.936 |
| 80 | 18 | 3 | 0.983 |
| 88 | 18 | 3 | 0.959 |
| 95 | 18 | 3 | 0.916 |
| 80 | 20 | 3 | 0.979 |
| 88 | 20 | 3 | 0.951 |
| 95 | 20 | 3 | 0.900 |
4 Large Pump barbs in the device
2 Bottom interface barbs in the device
2 One way valve barbs in the device
4 Test chamber barbs in the device
| Temperature (°F) | Pressure (PSI) | Years | Probability of No Failure |
|---|---|---|---|
| 80 | 15 | 3 | 0.955 |
| 88 | 15 | 3 | 0.897 |
| 95 | 15 | 3 | 0.793 |
| 80 | 18 | 3 | 0.940 |
| 88 | 18 | 3 | 0.865 |
| 95 | 18 | 3 | 0.734 |
| 80 | 20 | 3 | 0.927 |
| 88 | 20 | 3 | 0.838 |
| 95 | 20 | 3 | 0.690 |
These numbers only makes sense if we say that the barbs act independently from each other and that one failing or struggling has no effect on the other barbs.
End of Report