Plumbing Engineer April 2019/61
showing options for worst-case scenarios, data tables with values for calculation inputs, and details and notes provid- ing insight into the previous pages. Typically, engineers use calculations as a tool. However, some effort early on can help to make the calculation more than a sizing apparatus or justification; it could become part of the project timeline. Over the course of the project - from schematic design to contract administration - the calculations at each stage can help understand how the project evolved. Throughout the entire project, there may be other engi- neers who take over or are helping ease the timeline crunch. To aid in the clarity of the calculation package, it should include a cover sheet, the calculation and supplemental information applicable to that phase and calculation. This is the post-college version of a neatly enveloped answer in a box. l Emily Koussa is certified in plumbing design and a LEED accredited professional who brings more than a decade of experience to the indus- try. A graduate from Milwaukee School of Engineering, she currently resides on the mechanical engineering team at SmithGroup but exclusively focuses on plumbing. She can be reached at ekoussa@smithgroup.com. Comments for the calculation can be both hidden and visible. Visible comments help to clarify areas of a calcula- tion for the end user and reviewer, but hidden calculations should be used to guide the direct user of the calculation for how to properly input data, assumptions, type of data for the cell and supplementary information specific to the cell. Sometimes a hidden knock-knock joke or message is added to see if anyone is truly paying attention to the calculation. Finally, formulas are necessary to maintain the integrity of the calculation for both the direct user and end user of the calculation. It may be obvious how the pump head is calculated to the person creating the calculation, but when used as a teaching tool and sharing with peer reviewers or other trades, this level of detail should be made immedi- ately available so there is no confusion. The formulas can be worked into the calculation formally with text, added as a visible note or reference supplemental information that follows the calculation. Supplemental Information Providing supplemental material at the end of the cal- culation package conveys all the information not found in the calculation. It is information to help further understand the calculation. Relaying as much information for as much clarity as possible can reduce the time spent by the reviewer attempting to understand where the results were derived. Supplemental information may include flow diagrams
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