Fire Suppression
Hydrostatic Test Due Date
When does this cylinder need its next hydrostatic test? Plug in the type and manufacture or last test date.
NFPA 10 hydrostatic test intervals
| Cylinder type | Interval |
|---|---|
| Wet chemical (Class K) | 5 years |
| AFFF / FFFP foam | 5 years |
| CO2 (DOT) | 5 years |
| Stored-pressure dry chem (ABC) | 12 years |
| Stored-pressure water | 12 years |
| Halon 1211 | 12 years |
| Clean agent (Halotron, FK-5-1-12) | 12 years |
| Dry powder (Class D) | 12 years |
FAQ
What's a hydrostatic test? +
Pressurize the empty cylinder with water to 5/3 of its working pressure. Hold, measure expansion. Cylinders that exceed acceptable expansion or show leaks fail and must be condemned.
Who can do it? +
Only DOT-licensed test stations with proper equipment. Not field-service.
What if the date stamp is missing or illegible? +
Cylinder must be condemned and replaced. No way to prove compliance.