DUNGS SBO / CO - Gas Orifices (US/CA)

[{"filename":"sbo-co_manual_us_261485.pdf","text":"SBO and CO Gas Orifice\n Flow Metering Devices USA CDN\n Installation Instructions\n\n\n\n Table of Contents\n Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . Page 1\n Attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1\n Screwed Brass Orifices (SBO) . . . . . . . . . . . . . Page 2\n Carbon Steel Orifices (CO) . . . . . . . . . . . . . . . . Page 2\n Sizing an Orifice . . . . . . . . . . . . . . . . . . . . . . . . . Page 3\n Screwed Brass Orifices (SBO) . . . . . . . . . . . . . Page 3\n Screwed Brass Orifices (SBO) . . . . . . . . . . . . . Page 4\n Carbon Steel Orifices . . . . . . . . . . . . . . . . . . . . . Page 5\n Carbon Steel Orifices . . . . . . . . . . . . . . . . . . . . . Page 6\n Correction Factor Calculation . . . . . . . . . . . . . Page 6\n Installation of SBO Orifices . . . . . . . . . . . . . . . Page 7\n Installation of CO Orifices . . . . . . . . . . . . . . . . . Page 7\n Requirements for Straight Pipe Lengths . . . . Page 8\n\n\n\n Attention\n The installation and maintenance Check the ratings in the speci-\n of this product must be done fications to make sure that they\n under the supervision of an ex- are suitable for your application.\n perienced and trained specialist.\n Never perform work if gas pres- [V] [A]\n sure or power is applied, or in [Hz] [VA]\n the presence of an open flame.\n\n Please read the instruction be- On completion of work on the SBO\n fore installing or operating. Keep Safety and CO Gas Orifices, perform a\n the instruction in a safe place. You\n first leakage test.\n\n\n O.K.\n find the instruction also at www.\n dungs.com If these instructions\n are not heeded, the result may\n be personal injury or damage to\n property.\n\n\n\n\n MC • Karl Dungs, Inc. • SBO, CO Gas Orifices • Edition 2025.05 • P/N 261485\n\n\n\n\n Explanation of symbols\n 1, 2, 3 ...\t = Action\t\t\n • = Instruction\n1…8\n\f Screwed Brass Orifices (SBO)\n 1/2 - 2” NPT; rated 250 PSI\n\n• Low cost metering device permits accurate setting of burner\n air and gas flow for optimum efficiency.\n• +/- 1 % accuracy depending on location, measurement\n accuracy and proper use of correction factors.\n• One piece machined brass connection\n• Includes brass hex-head screws to plug holes when mea-\n surements are not being taken.\n• Metal tag chained to orifice clearly shows orifice pipe size\n and part number.\n• For temperatures up to 300 °F.\n• 1/8” NPT pressure taps.\n\n Carbon Steel Orifices (CO)\n 2 1/2 - 24”; rated 250 PSI\n• Low cost metering device permits accurate setting of burner\n air and gas flow for optimum efficiency.\n• Can be socket-welded to pipes or mounted between\n flanges (Karl Dungs does not sell mating flanges).\n• +/- 1 % accuracy depending on location, measurement\n accuracy and proper use of correction factors.\n• One piece zinc-plated, carbon steel.\n• Includes brass hex-head screws to plug holes when mea-\n surements are not being taken.\n• Metal tag chained to orifice clearly shows orifice pipe size\n and part number.\n• For temperatures up to 1200 °F.\n• 1/8” NPT pressure taps.\n• Fits to ANSI Class 150 & 300 Flanges.\n\n\n\n\n MC • Karl Dungs, Inc. • SBO, CO Gas Orifices • Edition 2025.05 • P/N 261485\n\n\n\n\n 2…8\n\f Sizing an Orifice\n • Use the tables on pages 3 and 4 for sizing a threaded orifice. • Select the orifice by either pressure drop or by flow. Apply\n Use the tables on page 5 and 6 for sizing a flanged, carbon correction factors where needed.\n steel orifice.\n • The tables show the air flow in SCFH in hundreds and the\n corresponding pressure drop in In. W.C.\n\n Screwed Brass Orifices (SBO)\n Pipe Model Pressure Drop (“W.C.)\n Size NPT Number\n 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0\n 1/2” SBO-G-3 0.33 0.46 0.56 0.65 0.73 0.80 0.86 0.92 0.98 1.03\n 1/2” SBO-H-1 0.54 0.76 0.94 1.08 1.21 1.32 1.43 1.53 1.62 1.71\n 1/2” SBO-I-5 0.87 1.22 1.50 1.73 1.93 3.12 2.29 2.45 2.60 2.74\n 1/2” SBO-J-7 2.14 3.02 3.70 4.27 4.77 5.23 5.65 6.04 6.41 6.75\n 1/2” SBO-F-1 3.60 5.09 6.24 7.20 8.05 8.82 9.52 10.18 10.80 11.38\n 3/4” SBO-K-1 0.16 0.22 0.27 0.31 0.35 0.38 0.41 0.44 0.47 0.49\n 3/4” SBO-J-3 0.31 0.44 0.54 0.62 0.69 0.76 0.82 0.88 0.93 0.98\n 3/4” SBO-A-1 0.52 0.73 0.89 1.03 1.15 1.26 1.36 1.46 1.55 1.63\n 3/4” SBO-B-5 0.82…