Prep Series 2020 Week 15 #7

9/20/2020

JG: Please see my question and solution attached. The question references space which infers the quantity of agent. It does not ask for concentration. Based on concentration the solution is correct. But by assuming an ambient temp of 70 degree F, the ranking order would be differ from the solution. Which is related to space/quantity of agent, what the question asks. Am I missing something?
What are your thoughts?

TH: I just wanted to check with you about this question. Isn't the quantity of agent also dependent on the specific volume of the agent? That lead me to put the answers I had after reviewing the Table A.5.5.1 and Table A.5.5.2 volume requirements. I checked for varying temps (70F and 10F) and still ended up with the same order I input in the screenshot below.

2 Comments

Chris Campbell

9/22/2020 12:11:06 pm

I believe the question should specifically state whether the agents should be ranked by weight or by volume.

If by weight, I agree with the general premise of both comments - while the design concentration is certainly a variable, so is the specific volume of each agent, which also varies with temperature. Each of these variables would need to be considered in the analysis.

If by volume, then then the design concentration is the only variable and the provided solution is correct.

Joe Meyer

9/23/2020 11:08:45 am

Agreed - thanks for the input. The question is updated to clarify that it is asking for volume and not weight.

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