以下为句子列表：
英文: If installing the water heater in a closed water system, install a relief valve or expansion tank in the cold water line as specified under Closed System/Thermal Expansion.
中文: 如果是在一个封闭的水系统中安装热水器，按照“关闭系统/热膨胀”中的规定，安装一个安全阀或膨胀罐。
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英文: Install a diaphragm-type expansion tank that is suitable for potable water on the cold water supply line.
中文: 在冷水供应管道上安装一个适用于饮用水的隔膜型膨胀罐。
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英文: The expansion tank must have a minimum capacity of 1.5 U.S. gallons for every 50 gallons of stored water.
中文: 这种膨胀罐必须具有50加仑贮存水最小1.5加仑膨胀能力。
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