What types of hydrants are commonly encountered in NFPA 13E scope, and what climates influence their use?

• A. Wet-barrel and dry-barrel hydrants (with combinations also used); climate influences freezing risk and operability requirements
• B. Only dry hydrants in all climates
• C. Hydrants are not used in NFPA 13E
• D. Subterranean hydrants are the primary type in all climates

Answer: (B)

The main idea here is how hydrant type is tied to climate and what keeps water available without freezing. Wet-barrel hydrants hold water in the barrel and deliver it quickly when opened, which is great where freezing isn’t a big issue and fast response matters. Dry-barrel hydrants keep the water supply underground and the above-ground part stays dry; the hydrant drains after use to prevent freezing, making them preferable in cold climates where groundwater and underground lines are protected from freezing.

Because of these differences, you commonly see both wet-barrel and dry-barrel hydrants, and sometimes combination or adaptable hydrants, depending on local weather and maintenance considerations. NFPA 13E guidance supports selecting hydrants that fit the climate and operability needs, rather than sticking to one type for all situations.

So the idea is that hydrants come in both wet-barrel and dry-barrel varieties (with possible combinations), and climate influences which type is used because freezing risk and reliable operation drive the decision. The notion that only one type is used in all climates isn’t accurate.