Laserfiche WebLink
<br />RFP 24-057 <br /> <br />587 -0702 <br /> <br />I <br /> <br />Nominal Duct Diameter (inches) <br /> <br />Duct Stiffness (psi) <br /> <br />1-8 <br />10 <br />12-16 <br />18 and larger, buried <br />18 and larger, other locations <br /> <br />36 <br />18 <br />9 <br />10 <br />5 <br /> <br />Buried duct and fittings will be designed in accordance with Appendix A of <br />AWWA C950 to withstand the simultaneous application of either the following <br />external loading and internal pressure or the following external loading and internal <br />vacuum, whichever produces a stiffer pipe: <br /> <br /> Field External <br /> Duct Size Load Internal Pressure Internal Vacuum <br /> inches Ib per If psia in. water column <br /> 6 1450 25 20 <br /> 8 1150 25 20 <br /> 12 1600 25 20 <br /> 14 1900 25 20 <br />I 16 1850 25 20 <br />18 2400 25 20 <br />24 2750 25 20 <br /> 30 1875 25 20 <br /> 36 6500 25 20 <br />C. Temperature and Pressure: All duct, fittings, and appurtenances will be suitable for <br /> the following conditions: <br /> <br />DesiQn Temperature. OF <br /> <br />Minimum <br />Maximum <br />Internal pressure, psig <br />Internal vacuum, inches <br />water column <br /> <br />10 <br />120 <br />25 <br /> <br />20 <br /> <br />D. Coefficient of Thermal Expansion: All ductwork, fittings ~md appurtenances will have <br />a coefficient of thermal expansion not exceeding: <br /> <br />9.6 x 10.e inlin OF for centrifugally cast pipe, <br />10.5 x 10.e in/in OF filament wound pipe. <br /> <br />I <br /> <br />E. <br /> <br />Expansion Joint Performance: Expansion joints will be furnished in sufficient <br />number to accommodate the coefficient of thermal expansion increased by a factor <br />of two. The minimum and maximum air temperatures will be OOF and 115~, <br /> <br />15892-2 <br />