Refresher Practical Problems Practice Test

The water demand of a wall hydrant in a plumbing system is typically assessed based on common usage scenarios in residential or commercial settings. A wall hydrant is designed to provide sufficient flow for tasks such as washing cars, filling large containers, or irrigation purposes.

In this context, a demand of 8 gallons per minute (gpm) is a reasonable estimate. This amount allows for effective functionality without excessive pressure drop or strain on the plumbing system. It balances the need for adequate water supply for various tasks typically associated with wall hydrants, ensuring that the system can handle simultaneous uses and maintain performance.

The other choices—4 gpm, 6 gpm, and 10 gpm—either underrepresent or overestimate the standard demand found in practical applications. A demand of 4 gpm might not suffice for typical tasks, while 10 gpm may exceed what is typically needed for a wall hydrant, thus potentially leading to inefficiencies or complications in the plumbing system.