6 Buried installations Thrust blocks: most properly bedded installations do not require thrust blocks at ambient operating temperatures. Consult Ameron for information regarding blocking of buried pipelines for your specific application. Live loads: when properly bedded in compacted sand in stable soils and provided with at least 3 ft (1 m) of cover, Bondstrand 4000 will carry H20 wheel loadings of at least 16,000 lb (7250 kg) per axle. Field testing Bondstrand 4000 piping systems are designed for hydrostatic testing at 150% of rated operating pressure. Pneumatic testing is not recommended. Span lengths Recommended maximum support spacings for Bondstrand Series 4000 pipe at various operating temperatures. Values based on 0.5-inch (12 mm) deflection at midspan for fluid specific gravity = 1.0. Nominal Pipe Size Continuous Spans (ft) Single Spans (ft) ( in) (mm) 100 °F 150°F 200°F 250°F 100°F 150°F 200°F 250°F 2 50 13.6 12.9 12.0 10.8 9.1 8.6 8.0 7.2 3 80 15.6 14.7 13.7 12.4 10.4 9.8 9.1 8.3 4 100 17.9 17.0 15.8 14.3 12.0 11.3 10.5 9.5 6 150 20.0 18.9 17.6 15.9 13.4 12.6 11.8 10.6 8 200 22.3 21.1 19.6 17.7 14.8 14.0 13.1 11.8 10 250 23.6 22.3 20.8 18.8 15.7 14.9 13.8 12.5 12 300 24.7 23.4 21.8 19.7 16.5 15.6 14.4 13.1 14 350 26.0 24.6 22.9 20.7 17.3 16.4 15.3 13.8 16 400 28.0 26.5 24.6 22.2 18.6 12.6 16.4 14.8 1) Span recommendations include no provision for weights (fittings,valves, flanges, etc.) or thrusts (branches, turns, etc.). 2) Span recommendations are calculated for a maximum long-term deflection of 1/2 inch to ensure good appearance and adequate drainage. 3) Continuous spans are defined as interior (not end) spans that are uniform in length and free from structural rotation at the supports. Single spans are supported only at the ends and are hinged or free to rotate at the supports.
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