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CONTINUED | 7 <br />5.RECOMMENDED DESIGN <br />BEST PRACTICES: <br />5.1. Provide approximately 10 feet of pipe between <br />the regulator and generator gas inlet. This does not <br />have to be a single straight run. The pipe volume <br />decouples the dynamic response of the generator <br />throttle control system and the service regulator, <br />reducing the probability of oscillation and unstable <br />operation. <br />5.2. Avoid installing elbows or pipe swages <br />immediately upstream or downstream of a regulator, <br />unless specifically allowed by the regulator <br />manufacturer. This will increase the turbulence of the <br />gas flow, having a negative impact on pressure <br />regulation accuracy and stability. Regulator <br />manufacturers typically recommend 10 pipe <br />diameters of straight pipe run upstream and <br />downstream of a regulator. For example, on a <br />regulator with 2" diameter pipe fittings, 20" of straight <br />pipe should be fitted upstream and downstream of <br />the regulator. When field conditions prohibit meeting <br />both constraints, place the elbow on the high- <br />pressure side of the regulator. The straight run on the <br />low-pressure side is more critical for proper regulator <br />operation. <br />5.3. Avoid installing pipe swages immediately before <br />or after an elbow. The combined flow turbulence of <br />the swage and elbow in close proximity can cause <br />unexpectedly large pressure drops at high flow rates. <br />Table 2: Natural Gas Fuel Pipe Sizing <br />PIPE SIZE (inches) <br />KW 1.00"1.25"1.5"2"2.5"3"4"5"6" <br />25 10 95 220 739 <br />30 60 147 565 <br />40 25 75 315 790 <br />50 50 220 560 <br />60 25 145 390 1185 <br />70 5 75 225 710 <br />80 65 195 630 <br />100 40 140 460 <br />130 50 215 <br />150 30 150 <br />200 15 95 475 <br />250 62 315 1020 <br />300 35 255 850 <br />350 10 145 535 <br />400 107 452 <br />500 42 245 650 <br />625 120 395 <br />750 112 380 <br />NOTE: Pipe sizing is based on 0.5" H2O pressure drop for Naural Gas. Also sizing includes nominal number of elbows and tees. <br /> Please verify adequate service and meter sizing. <br />Natural Gas Supply System Design Guide for Generac Industrial Spark Ignited Generators <br />TABLE VALUES ARE MAXIMUM PIPE RUN IN (feet) <br />11"-14" W.C. 1,408,000 BTU's <br />Docusign Envelope ID: 2F58BEE5-DDBE-42EB-8DFA-5E2508488B04