To perform leakproofness performance testing on Drip Torches in accordance with quality assurance procedures and federal laws.
What is leakproofness testing?
Drip Torches are sealed and completed submerged under water with a minimum of 3 psi internal pressure applied to ensure that the tank does not leak.
Why do we test these tanks?
Drip Torch tanks are tested to ensure that the fuel mixture is secure even under pressure caused by vapor build-up in real-world application. End-users expect that the fuel container will not leak, and the US Forest Service and Department of Transportation requires it.
When do we test tanks?
Every Drip Torch tank is tested after welding and any time that it leaves and returns to our facility (supplier processing like powder coating). This is to ensure that the tank was properly welded and that nothing happened to the tank when outside of our controlled environment. We are required by law to test each and every tank at least once (production testing), and then a sample of tanks annually under stricter conditions.
- Install a clean Tank Cover Gasket into the gasket recess of the drip torch.
- Secure the testing device to the drip torch, ensuring that the Lock Ring is snug plus 1/4 turn.
- Close the pressure relief valve.
- Apply between 5 psi and 10 psi to the drip torch.
INSPECTION POINT: Allow the pressure gauge to stabilize and note the tank pressure.
- If the stabilized pressure is less than 3 psi, repeat steps 4 and 5 to ensure a minimum tank pressure of 3 psi.
- If the pressure gauge does not stabilize and continues to drop in pressure, repeat steps 1-5. If the process yields the same result, stop testing and notify a member of the Quality Management Team for inspection of the testing device.
- Completely submerge the drip torch in the water so that the lock ring is under water. With production testing, you are just submerging the tank long enough to check for leaks. Annual performance testing requires a minimum submersion of five minutes.
INSPECTION POINT: Check for a loss of tank pressure and for any bubbles from the tank or openings that would signify a leak.
- If a leak is detected from the tank, mark the tank in the area that is leaking and segregate the tank as nonconforming.
- If any leaks are detected from the closure, or there is a loss of tank pressure without any identified bubbles, repeat steps 1-6 and ensure a proper seal on the closure mating surface. If the process yields the same result, stop testing and notify a member of the Quality Management Team for inspection of the testing device.
- Remove the tank from the water, release tank pressure by opening the pressure relief valve, and remove the testing device.
The Drip Torch tank passes the test if there is no leakage of air from the tank.
Leakproofness performance testing is governed by 49 CFR § 178.604.