The maximum flow rate of release for portable tanks and cylinders shall be calculated based on the total release from the cylinder or tank within the time specified in Table 6004.2.2.7.5. Where portable tanks or cylinders are equipped with approved excess flow or reduced flow valves, the worst-case release shall be determined by the maximum achievable flow from the valve as determined by the valve manufacturer or compressed gas supplier. Reduced flow and excess flow valves shall be permanently marked by the valve manufacturer to indicate the maximum design flow rate. Such markings shall indicate the flow rate for air under normal temperature and pressure.
RATE OF RELEASE FOR CYLINDERS AND PORTABLE TANKS
| VESSEL TYPE | NONLIQUEFIED (minutes) | LIQUEFIED (minutes) |
| Containers | 5 | 30 |
| Portable tanks | 40 | 240 |