Color Inspiration: Fire Hydrants

Fire hydrant coloring may be due either to purely practical criteria or more artistic. In America, the AWWA and NFPA recommend hydrants be colored chrome yellow for rapid identification apart from the bonnet and nozzle caps which should be coded according to their available flow. Class AA hydrants (>1500gpm) should have their nozzle caps and bonnet colored light blue, Class A hydrants (1000-1499gpm), green, Class B hydrants (500-999gpm), orange, and Class C hydrants (0-499gpm), red. This aids arriving firefighters in determining how much water is available and whether to call for additional resources, or locate another hydrant. Other codings can be and frequently are used, some of greater complexity, incorporating pressure information, others more simplistic. In Ottawa, hydrant colors communicate different messages to firefighters; for example, if the inside of the hydrant is corroded so much that the interior diameter is too narrow for good pressure, it will be painted in a specific scheme to indicate to firefighters to move on to the next one. In many localities, a white or purple top indicates that the hydrant provides non-potable water. Where artistic and/or aesthetic considerations are paramount, hydrants can be extremely varied, or more subdued. In both instances this is usually at the cost of reduced practicality.

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Thanks to Lex for the topic suggestion.