I submitted it the Edward Rouse firm for review and comment and for a fee they reviewed it, made a minor correction, and then, as their letter states, “Because of the low water supply we had to calculate real tight.” See Figure 3 for the first page of my hand calculation, for a gridded sprinkler system, using a slide rule. My first hydraulic calculations, with a slide rule and the 1975 or l976 National Fire Protection Association, Installation of Sprinkler Systems, NFPA 13, were small systems, but in 1976 I tried a gridded system calculation. Mine was a National Fire Sprinkler Corporation ‘Fire Rule’, see Figure 2, and it was going to, and did, replace the friction loss tables.įigure 2 – Slide Rule and Friction Loss Table Many of you reading this have never seen a slide rule, let alone a hydraulics slide rule, but we used slide rules in high school and my first year of college.
We submitted drawings on a project or two and then I purchased a hydraulics slide rule. Rouse, Incorporated, that would perform the calculations if you submitted them drawings. Warner decided he wanted to utilize hydraulic calculations to be competitive and we became aware of an engineering firm in Minneapolis, Minnesota, Edward H. Both of those tasks were quite boring for a third year engineering student, so I blew through them and ask for a project to design. Someone else had designed the system and he thought if I copied it I’d better understand it. I started with a blank drawing and drew the little circles, connected the circles, and really had no idea what those represented.
Don Warner hired me as a sprinkler system designer (I really knew nothing about the industry) and I worked with Don and Carroll Mitchell (a fantastic superintendent and sprinkler fitter) for about four years.ĭon gave me a copy of the ‘Red Book’, see Figure 1, and told me to read it, also gave me a warehouse project to ‘copy the sprinkler system’ so I’d learn it as I copied it. My parents, as most would, told me to find a job and within a few weeks I found employment with Blackhawk Automatic Sprinkler Company in Waterloo, Iowa. In 1975 I left college and returned home to decide whether or not I wanted to continue down the path as a Civil Engineering student.
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