6 Support spacing Values are based on a 1⁄2 - inch (12 mm) deflection at midspan. Nominal Single Span1 Continuous Span2 Pipe Size Gases 1.003 1.25 Gases 1.00 1.25 ( in) (mm) ( ft) (m) (ft) (m) ( ft) (m) ( ft) (m) (ft) (m) ( ft) (m) 2 50 14.4 4.4 9.7 3.0 9.3 2.8 21.5 6.6 14.5 4.4 13.9 4.2 3 80 17.7 5.4 11.1 3.4 10.6 3.2 26.4 8.0 16.6 5.1 15.8 4.8 4 100 20.0 6.1 12.1 3.7 11.5 3.5 29.9 9.1 18.1 5.5 17.2 5.2 6 150 24.9 7.6 14.6 4.5 13.9 4.2 37.2 11.3 21.9 6.7 20.8 6.3 8 200 23.8 7.3 13.9 4.2 13.2 4.0 35.6 10.9 20.8 6.3 19.7 6.0 10 250 26.9 8.2 15.4 4.7 14.6 4.5 40.2 12.3 23.0 7.0 21.9 6.7 12 300 29.3 8.9 16.7 5.1 15.9 4.8 43.8 13.4 25.0 7.6 23.7 7.2 14 350 31.3 9.5 17.6 5.4 16.7 5.1 46.8 14.3 26.3 8.0 25.0 7.6 16 400 33.5 10.2 18.7 5.7 17.8 5.4 50.1 15.3 27.9 8.5 26.6 8.1 1) For fluid temperatures above 78°F (25°C), the span lengths decrease by 0.2 in/°F (9 mm/°C). 2) For intermediate spans. End spans may be calculated by multiplying the single span length by 1.8. 3) Fluid specific gravity. Minimum Maximum Minimum Nominal Bending Deflection Length Required Pipe Size Radius1 per 39-ft Joint for 10° Change ( in) (mm) ( ft) ( m) ( deg) ( ft) ( m) 2 50 75 23 302 132 4 3 80 100 30 20 20 6 4 100 150 46 15 27 8 6 150 200 61 10 40 12 8 200 300 91 7 + 2 = 93 57 - 13 = 444 12 10 250 350 107 6 + 2 = 8 67 - 13 = 54 16 12 300 400 123 5 + 2 = 7 80 - 13 = 67 20 14 350 450 137 4 + 2 = 6 100 - 13 = 87 27 16 400 500 152 3 + 2 = 5 133 - 13 = 120 37 1) At rated pressure. Sharper bends may create excessive stress concentrations. Do not bend pipe until adhesive has cured. 2) 2 - 6 inch: pipe only. 3) 8 - 16 inch: pipe deflection plus 2° Pronto-Lock II coupling deflection. 4) 8 - 16 inch: pipe minimum minus 13-ft (4 m) effect of Pronto-Lock II coupling deflection. Bending radius
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