试题与答案

危险化学品安全技术天然气集输管线放空时,易发生操作事故,下列操作方法,正确的是(

题型:单项选择题

题目:

危险化学品安全技术

天然气集输管线放空时,易发生操作事故,下列操作方法,正确的是(  )。

A.先点火后放空,在放空管口火焰高度降到1m以下时,立即关闭放空阀,以避免负压吸入空气

B.先放空后点火,在放空管口火焰高度降到1m以下时,立即关闭放空嘲,以避免负压吸入空气

C.先点火后放空,在放气管口火焰高度10m时,立即关闭放空阀,以避免负压吸入空气

D.先放空后点火,在放空管口火焰高度10m时,立即关闭放空阀,以避免负压吸入空气

答案:

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