Pipe size, table

Viscosity changes make conventional water pipe sizing tables useless these must be upgraded by the application of appropriate correction factors. 

For gases and vapors, typical fluid velocities are in the range of 15 to 30 m s-1. The fluid velocity must take account of standard pipe sizes. Table 13.7 gives details of a number of commonly used pipe sizes. 

Standard pipe is made in a discrete number of sizes that are designated by nominal diameters in inches, as inches IPS (iron pipe size). Table A5 lists some of these sizes with dimensions in inches. Depending on the size, up to 14 different wall thicknesses are made with the same outside diameter. They are identified by schedule numbers, of which the most common is Schedule 40. Approximately,... 

Choose a tube of size 5" (standard pipe) from Table 30.8 having the following dimensions,... 

In Tube OD the size specified indicates its outside diameter. . . whereas in Iron Pipe Size (IPS), the size has reference to a nominal diameter. See Table 2-1. 

From Table 2-4, select 6 ft/sec as design velocity for estimating pipe size. 

Determine Cj and C2 from Figure 2-31 and Table 2-11 for the steam flow rate and assumed pipe size respectively. Use Table 2-4 or Table 2-8 to select steam t eloc-ily for line size estimate. 

Refer to the large pipe multipliers shown in the table on the chart, and select the pipe size whose factor is equal to or smaller than the result of step (11) above. This is the pipe size to use, provided a sufficient factor of safety has been incorporated in the data used for the selection of pipe size. 

The outlet vapor line should be two nominal pipe sizes larger than the liquid inlet. Table 10-33 is helpful to relate exchanger size and pipe connections, although the same standards cannot apply to every design. 

Finally, the condensate is often pumped from the receiver to the boiler house. Pumped condensate lines carry only water, and rather higher water velocities can often be used to minimize pipe sizes. The extra friction losses entailed must not increase back pressures to the point where pump capacity is affected. Table 22.10 can be used to help estimate the frictional resistance presented by the pipe. 

Venting, dusts, (deflagration), nomograph, API, 514-520 Relief valves, 400 Code requirements, 415, 420 Installation, 422, 429-434 Safety-relief, 400 Relieving pressure, 411-417 Resistance coefficient, K, (flow), 71, 72 Flow coefficient, Q, 81, 83 Pipe sizing, 83, 84, 86 Sudden contraction, 80 Sudden enlargement, 80 Tables/charts, 73-76, 77, 78-80 Valves, 81... 

Table 13.7 Commonly used standard pipe sizes.

The friction factor may be calculated from a knowledge of the fluid Reynolds number using the chart shown as Figure 13.2. Table 13.1 indicates the friction factors that correspond to zero and 80% conversion for the three pipe sizes of interest at two temperature levels. Examination... 

The smaller the length element chosen, the more accurate the results will be, but more work will be involved. In the present case a length increment of 20 ft will be employed for each pipe size. Detailed calculations for the first few segments of a nominal 4-in. pipe size are carried out below. Table 13.2 summarizes the results of the calculations for the 4-in. pipe size. Figure 13.3 indicates the temperature and pressure profiles for this reactor. 

SEAL CHAMBER DATA (2.1.6Q.1.7) temperature (°C) PRESSURE (kPa) FLOW (m /h) n SEAL CHAMBER SIZE /TABLE 2.3) TUBING O CARBON STEEL PIPE STAINLESS STEEL PIPINGASSEMBLY (3.5.2.10.1) THREADED O UNIONS SOCKET WELDED FLANGED TUBE TYPE FITTINGS PRESSURE SWITCH /PLAN 52/53) TYPE... 

Accept the larger value as a conservative estimate. This suggests that a standard pipe of nominal pipe size 1.5, schedule number 80S, is suitable (Ref. P2 Table 6.6). This piping is 48 mm (1.9 in.) o.d. and 38 mm (1.5 in.) i.d. 

The nearest commercial pipe size (Ref. T4 Table 6.6) is a nominal pipe size of 1.5, schedule number 40S (with inside diameter of 41 mm and a wall thickness of 4 mm). 

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