Safety Technology Exchange Edition: Daily Question (2016.5.6)
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Type: Fill-in-the-blank question. Question: [Safety Techniques for Hot Work] The acceptable standard for hot work analysis is as follows: 1. When the lower explosive limit of the gas or vapor being tested is greater than or equal to 4%, its concentration should not exceed ____ (volume percentage)； 2. When the lower explosion limit of the gas or vapor being tested is less than 4%, its concentration shall not exceed ____ (volume percent). Answer: 0.5% ； 0.2%
1. 0.5% 2. 0.2%
1. When the lower explosion limit of the gas or vapor being tested is 4% or higher, its concentration shall not exceed _0.5%___ (volume percentage)； 2. When the lower explosion limit of the gas or vapor being tested is less than 4%, its concentration shall not exceed __0.2%__ (by volume).