Home hot-water heaters contain relief devices to provide protection in the event that the heater controls fail and the water is heated to a high temperature. A typical water heater contains \(40 \mathrm{gal}\) of water and has a heat input of 42,000 Btu/hr. If the heater is equipped with a 150-psia capacity-certified spring relief device, compute the area required for the relief. Single-phase flow is expected. Assume no overpressure.

Also compute the relief vent size assuming all vapor relief. Assume \(20 \%\) backpressure.