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Recommended operating Ratings Axial Tensile Loads Axial Compressive Bending Parallel Plate Loading Max. (Lbs) Loads Max. (Lbs)") Radius Min. Torque Max. ASTM D2412 (Ft) Entire (Ft Lbs) Stiffness Pipe ... ModulusSize Temperature Temperature Temp. Entire Temp. Factor Stiffness 2 1,280 930 4,160 2.420 51 90 71 311 2.6 3 2,601 1,887 8,408 4.900 76 270 174 226 2.6 4 3,110 2.260 10.070 5.860 97 420 142 86 2.6 6 6,230 4,520 20,140 11,730 142 1,200 443 85 2.6 8 8,570 6,220 27.720 16.150 183 2.200 569 49 2.6 10 13,930 10,110 45,030 26,230 227 4,450 955 44 2.6 12 19.050 13.820 61.600 35.890 269 7,250 1,460 40 2.6 14 27,160 19.710 87.830 51,160 308 11.800 2.810 52 2.6 16 35,020 25.410 113.220 65.960 352 17.400 4,030 50 2.6 18 40,990 29,750 132,530 77,210 391 22,700 4,750 43 2.6 20 46,350 33.630 149.850 87,300 433 28,500 4,960 32 2.6 24 64,110 46,530 207,290 120.760 520 47,400 7,430 28 2.6 (''Compressive loads are for short columns only. Proper pipe support spacing depends on the temperature 6. Avoid excessive vertical loading to minimi=e bending and weight of the fluid in the pipe. The support spacing table is stresses on pipe and fittings. based on unrestrained continuous beam theory using the pipe 7. Provide adequate axial and lateral restraint to ensure line bending modulus derived from long-term beam bending tests.The stability during rapid changes in flow. maximum spans lengths were developed to ensure a design that limits mid-span deflection to' 2inch and dead weight bending to'Ja Maximum Support Spacing for Uninsulated Pipe of the ultimate bending stress. Any additional loads on the piping Continuous Pipe Spans (Ft.)0)(2) system such as insulation, wind. seismic, etc. requires further Pipe Size Gas consideration. Restrained(anchored) piping systems operating at elevated temperatures may result in guide spacing requirements 2 12.6 12.0 11.4 19.1 that are shorter than unrestrained piping systems- In this case,the 3 15.0 13.5 12.6 22.1 maximum guide spacing governs the support span requirements 4 15.9 15.1 14.3 25.2 for the system. Pipe spans near elbows require special attention. 6 19.2 18.3 17.3 30.8 Both supported and unsupported elbows are considered in the following tables and must be followed to properly design the piping 8 21.1 20.0 19.0 35.0 10 23.2 22.0 20.9 38.9 system. There are seven basic rules to follow when designing piping 12 25.1 23.9 22.6 42.414 27.4 26.0 24.7 45.3 16 29.2 27.7 26.3 48.4 1. Do not exceed the recommended support span. 18 30.4 28.9 27.4 51.1 2. Support heavy valves and in-line equipment independently. 20 31.4 29.8 28.3 53.9 3. Protect pipe from external abrasion at supports. 24 1 34.1 32.4 30.7 59.0 4. Avoid point contact loads. Consult factory for insulated pipe support spacing. Maximum mid-span deflection with a specific gravity of 1.0. 5. Avoid excessive bending. This applies to handling. transporting, initial layout,and final installed position. 5