1. Compressed Gas Cylinders Limits
Below are the regulatory quantity limits for compressed gas cylinders in each control area. Flammable compressed gas is defined as a gas with an LEL < 13% or a range > 12 % between the LEL and UEL, regardless of the LEL. The maximum amounts are:
1. 1000 cubic feet of flammable gas
2. 30 gallons of a liquified flammable gas
3. 1500 cubic feet of oxidizer gas
4. 150 lbs (one cylinder) of anhydrous ammonia
- These quantities are doubled if storage is within approved cabinets, gas cabinets, fume hoods.
- These quantities are doubled if storage is within buildings equipped throughout with an automatic sprinkler system.
- If both of these conditions are met, these increases can be applied accumulatively.
- No flammable gas cylinder storage is allowed in the service corridors.
- One reserve cylinder is permitted to be stored next to an "in use" cylinder but it must be included in the count.
- All other cylinders not "in use" need to be stored outside.
- Cylinders in storage or in a manifold are all included in the maximum amount.
The quantity restrictions above are from the ICC code.
There are other restrictions for compressed gas supply systems detailed in NFPA 45, 50A and 55 that need to be reviewed as the final design proceeds.
Nominal volumes (cubic feet) of hydrogen gas cylinders are B=200, C=72 and D-1=33.
Nominal weight of contents (lbs) of liquified n-Butane are LP5=24 and LP2.5=12.
2. Flammable and Combustible Liquids Limits
In General, the Laboratory Buildings are classified as BUSINESS occupancy and the Process Buildings (307 & 702) are classified as H2 High Hazard. A control area is an area isolated from adjacent rooms by fire separation ( rated door, fire wall, etc.).