18.104.22.168 Compressed Gas Cylinders
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This category includes single or multiple gas cylinders. These may be attached to piping, anchored to carts for mobility, or stored for future use.
- Typical Causes of Damage
- Seismic Mitigation Considerations
Building Code Provisions
Since compressed gas cylinders are generally not permanently attached to the building utilities, they are considered “temporary or moveable equipment” and are exempt from the requirements of Minimum Design Loads for Buildings and Other Structures (ASCE/SEI 7-10).
When gas cylinders are connected to building utilities, ASCE/SEI 7-10 Chapter 13 requires anchorage for cylinders in Seismic Design Categories D, E, and F weighing over 400 pounds. Lighter cylinders may be exempt if the component Importance Factor Ip = 1.0. Cylinders that are exempt from the anchorage requirement are still required to be restrained to prevent damage between the gas cylinder and associated pipes.
Retrofit Standard Provisions
Seismic Rehabilitation of Existing Buildings (ASCE/SEI 41-06) classifies compressed gas cylinders as hazardous materials storage. Anchorage of compressed gas cylinders requirescompliance with the anchorage provisions of the standard when the performance level is Life Safety or higher. Prescriptive (non-engineered) anchorage approaches may be used.
Typical Causes of Damage
- Unanchored tanks may slide, overturn, and roll; connected piping may be damaged.
- Contents may be flammable or hazardous; leaking cylinders may be dangerous.
- Tank installations equipped with chains or straps are still susceptible to damage unless the chains or straps are properly secured around the tanks.
- Wall restraint detail shown at top of Figure 126.96.36.199-8 is a non-engineered detail for tank storage; this detail does not provide sufficient restraint for tanks attached to piping.
- Engineered details with additional restraints are required for tanks attached to piping; see corral detail at bottom of Figure 188.8.131.52-7 or scheme shown in Figure 184.108.40.206-2 and Figure 220.127.116.11-3.