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1·There is also a refillable potable water storage tank below grade that's also manually pumped.

还有一种可饮用水也是储存于手动泵。

2·The potable water expansion tank shall be of drawn steel construction.

这种饮用水膨胀罐应该是拉制钢结构。

3·The potable water system consists of a water tank, quantity indication, pressurization components, and distribution tubing.

饮用水系统由一个水箱、流量指示器、增压组件及分配管道组成。

4·Note: the potable water expansion tank shall be installed in the cold water service pipe line on the supply side of the water heater.

注：饮用水膨胀罐应该安装在热水器的供水端的冷水维修管道上。