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INSULATION SIZING GUIDE Conventional valve-shaped block insulation can These flow capacity recommendations are not affected occasionally be used for both angle and globe valves. by the length of the pipe line. These are approximate However,fabricated insulation shapes are recommended. optimum sizes based on power costs versus the If not available locally, Hansen can recommend a investment costs of piping and its total installed cost. source of high quality, economical valve insulation. Piping sized to this capacity will have a 1°F (0.6°C) For exterior valve insulation dimensions refer to Sales pressure drop for the following equivalent lengths: Drawing 5002-28. suction lines . . . . . . . 700 diameters EXTENDED NECK VALVES discharge lines . . . . . 1400 diameters liquid lines . . . . . . . . . 2400 diameters Hansen bonnets with extended necks, 1/2" thru 4" (13mm-100mm), meet or exceed the recommended low Example:275 feet(84m)of 3" (80mm)pipe and equivalent temperature insulation thickness dimensions of the IIAR fittings amount to 1100 diameters, pressure drop for a Piping Handbook. In addition, the stem and packing suction line handling 81.5 tons (287 kW) at 20°F (-7°C) nut trim are upgraded to 316 stainless steel materials. is 1100/700 times 1°F (0.6°C) drop, equals 1.6°F (1°C) Stainless steel trim is recommended for environments or 1.8 psi (0.12 bar). where severe corrosive conditions exist. (Add an "E" Example: Hansen valves have about 145 diameters of suffix to the model number, for example AWE200C or equivalent flow resistance,or 145/700=0.2°F(0.12°C)of GWE150H.) equivalent pressure drop at the suction line capacities shown for a valve in a suction line. The rationale for the vapor line sizing was developed by William V. Richards in two papers: "Refrigerant Vapor Line Sizing Not Dependent of Length,"16th International Congress of Refrigeration,IIR, Paris,1983;and"Practical Pipe Sizing for Refrigerant Vapor Lines," Sixth Annual Meetings, IIAR, San Francisco, 1984. FLOW COEFFICIENTS NOMINAL SIZE ANGLE GLOBE FLOW COEFFICIENT EQUIVALENT LENGTH FLOW COEFFICIENT EQUIVALENT LENGTH INCH MM Cv Kv FEET METERS Cv Kv FEET METERS 1/2" 13 6.0 5.2 3.7 1.1 4.0 3.5 8.4 2.6 3/4" 20 9.0 7.8 8.4 2.6 8.0 6.9 11 3.2 1" 25 19 16 7.2 2.2 15 13 12 3.5 11/4 32 21 18 27 8.2 16 14 46 14 11/2" 40 53 46 10 3.0 41 35 16 5.0 2" 50 80 69 23 7.0 67 58 33 10 21/2" 65 173 150 13 3.8 163 141 14 4.3 T. 80 205 177 28 8.5 195 169 31 9.3 4" 100 320 277 47 14.3 290 251 57 17 5" 125 600 519 44 13.3 575 497 47 14 6" 150 820 709 61 18.5 1 790 683 66 20 8" 200 1440 1240 82 25.1 1380 1190 90 27 10" 250 2450 2120 93 28.4 2350 2030 101 31 12" 300 3400 2940 119 36.2 3270 2830 128 39 14" 350 4600 3980 113 1 34.4 4350 3770 126 38 16" 400 5640 4880 155 47.3 1 - - - - 18" 450 6500 5620 222 67.6 - - - - .3 G359d NOV 2019