Pressure and differential pressure instruments shall be located above the taps for gas, boiling liquids and noncondensable vapors and below the taps for non-boiling liquids and condensable vapors.

• 压力仪表和差压仪表的位置应高于气体、汽化液体和非冷凝蒸气的接口，但低于非冷凝液体和冷凝蒸气接口。