Hangers shall be designated to support how many times the weight of water filled pipe?

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Multiple Choice

Hangers shall be designated to support how many times the weight of water filled pipe?

Explanation:
The main idea here is how hangers are rated to carry the pipe’s load. When a sprinkler pipe is in service, it’s filled with water, and that water adds a substantial, and sometimes changing, weight. Hangers are specified with a safety margin so they won’t fail under normal operation or transient events like water hammer, thermal movement, or minor seismic forces. The standard rating uses five times the weight of water-filled pipe. That means if a section of pipe weighs W per unit length when full of water, the hanger is designed to support 5W per unit length. This fivefold margin provides an appropriate balance between safety and material cost. A lower factor wouldn’t give enough headroom for surge or movement, while a higher factor would be more conservative than typically required. The weight of insulation isn’t included in this designation unless the code or manufacturer says so.

The main idea here is how hangers are rated to carry the pipe’s load. When a sprinkler pipe is in service, it’s filled with water, and that water adds a substantial, and sometimes changing, weight. Hangers are specified with a safety margin so they won’t fail under normal operation or transient events like water hammer, thermal movement, or minor seismic forces. The standard rating uses five times the weight of water-filled pipe. That means if a section of pipe weighs W per unit length when full of water, the hanger is designed to support 5W per unit length.

This fivefold margin provides an appropriate balance between safety and material cost. A lower factor wouldn’t give enough headroom for surge or movement, while a higher factor would be more conservative than typically required. The weight of insulation isn’t included in this designation unless the code or manufacturer says so.

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