Pipe flow schedule number

Nominal pipe size 30, schedule number 80 —Shell thickness 3 1 mm —Constructed from carbon steel —6 internal cross-flow baffles... 

Nominal Pipe Size, in. Outside Diameter, in. Schedule Number or Weight Wall Thickness, in. Inside Diameter, in. Surface Area Outside, Inside, ftyft Areas and Weights Cross-sectional Metal Flow Area, Area, in. in. Weight Pipe Ib/ft... 

Determine the value of the Reynolds number for SAE 10 lube oil at 100°F flowing at a rate of 2000 gpm through a 10 in. Schedule 40 pipe. The oil SG is 0.92, and its viscosity can be found in Appendix A. If the pipe is made of commercial steel (e = 0.0018 in.), use the Moody diagram (see Fig. 6-4) to determine the friction factor / for this system. Estimate the precision of your answer, based upon the information and procedure you used to determine it (i.e., tell what the reasonable upper and lower bounds, or the corresponding percentage variation, should be for the value of / based on the information you used). 

To use the Pipe Friction Manual chart, compute the velocity of the liquid in the pipe by converting the flow rate to cubic feet per second. Since there are 42 gal/bbl and 1 gal = 0.13368 ft3, 1 bbl = (42)(0.13368) = 5.6 ft3. With a flow rate of 500 bbl/h, the equivalent flow in ft3 = (500)(5.6) = 2800 ft3/h, or 2800/3600 s/h = 0.778 ft3/s. Since 6-in schedule 40 pipe has a cross-sectional area of 0.2006 ft2 internally, the liquid velocity, in ft/s, equals 0.778/0.2006 = 3.88 ft/s. Then, the product (velocity, ft/s)(internal diameter, in) = (3.88)(6.065) = 23.75. In the Pipe Friction Manual, project horizontally from the kerosene specific-gravity curve to the vd product of 23.75 and read the Reynolds number as 61,900, as before. In general, the Reynolds number can be found faster by computing it using the appropriate relation given in Table 6.1, unless the flow velocity is already known. 

Calculate the Froude numbers and flow conditions for the 2-, 4- and 6-inch (Schedule 40) vertical pipes having the following liquid and vapor flow rates and densities. 

The computer program PROG36 calculates the Froude numbers for the liquid and vapor phases. In addition, PROG36 will determine whether the pipe is self venting or whether pulsation flow is encountered. Table 3-13 shows the results for the 2-, 4-, and 6-inch (Schedule 40) pipes. Table 3-14 gives a typical input data and computer output for the 2-inch (Schedule 40) pipe. 

From the Colburn analogy, how much would the heat-transfer coefficient inside a 1-in. Schedule 40 steel pipe differ from that inside a 1-in. BWG 16 copper tube if the same fluid were flowing in each and the Reynolds number in both cases was 4 X 10 ... 

In using App. A.4, remember where it comes from each calculation such as that in Example 6.3 produced one table entry. By making such calculations for a large number of flow rates and pipe diameters, we can make up App. A.4. Thus, that appendix is simply Fig. 6.10, rearranged for the special case of 60°F water flowing in schedule 40 pipes. 

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