When performing a periodic gauge glass blow down to insure that the glass is free and operating correctly, what action is performed first?
Close the bottom shut off valve and open the drain valve to clear out the bottom connection to the gauge glass.
Close the top shut off valve and open the drain valve to clear out the bottom connection to the gauge glass.
Close the bottom shut off valve and open the drain valve to clear out the top connection to the gauge glass.
Close the top shut off valve and open the drain valve to clear out the top connection to the gauge glass.
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