Pipes schedule number

Pipe schedule number = 1000P/S, approximately, where P is the internal pressure psig and S is the allowable working stress (about 10,000 psi for A120 carbon steel at 500°F). Schedule 40 is most common. 

Like compressors, pipes do not come in all possible sizes. To select an available size, use a table of standard pipe sizes and choose one close to the diameter estimated for the assumed velocity. The pipe Schedule Number is an indicator of... 

When using alloy pipe with greater tensile strength than carbon steel, the schedule numbers still apply, but may vary, because it is unnecessary to install thicker walled alloy pipe than is necessary for the strength and corrosion considerations. Schedules 10 and 20 are rather common for stainless steel pipe in low pressure applications. 

Nominal Pipe Size Inches Schedule Number Value of C2 Nominal Pipe Size Inches Schedule Number Value of C2 Nominal Pipe Size Inches Schedule Number Value of Cz... 

It is important to note that the IDs of all pipes of the same nominal size are not equal. This is because the OD remains constant and the wall thickness increases as the schedule number increases. For example, a nominal 1-inch Schedule 40 pipe has a 1.049-inch ID. The same size Schedule 80 pipe has a 0.957-inch ID, while Schedule 160 pipe has 0.815-inch ID. In each case, the OD is 1.315-inch and the wall thickness varies. The actual wall thickness is the difference between the OD and ID divided by 2. 

Pipes are often specified by a schedule number (based on the thin cylinder formula). The schedule number is defined by ... 

The dimensionless pipe wall thickness (times 1000) is known as the Schedule number of the pipe ... 

Using the actual dimensions of commercial steel pipe from Appendix F, plot the pipe wall thickness versus the pipe diameter for both Schedule 40 and Schedule 80 pipe, and fit the plot with a straight line by linear regression analysis. Rearrange your equation for the line in a form consistent with the given equation for the schedule number as a function of wall thickness and diameter ... 

The yield stress for carbon steel is 35,000 psi, and the working stress is one-half of this value. What schedule number would you recommend for a pipe carrying ethylene at a pressure of 2500 psi if the pipeline design calls for a pipe... 

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,... 

The required heat-transfer area of 19.5 m2 is based on an overall heat-transfer coefficient of 102 W/(m2 K). The best exchanger geometry for this application includes six internal baffles, one shell-side pass and two tube-side passes. The shell is fabricated from standard carbon steel piping of nominal pipe size 30, schedule number 80. The 112 tubes required are each 1.83 m long and 38.1 mm (1.5 in.) o.d. (BWG 12). The tubes must be fabricated from stainless steel type 250 for reasons of temperature tolerance. 

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

Sealing strips required 1 every 3 vertical tube rows -In/outlet branch nominal pipe size 4, schedule number 80 heat-transfer coefficient 570 W/(mJK)... 

The shell is constructed from carbon steel and will be fabricated from standard pipe of nominal size 30, schedule number 80. The 112 tubes required are 1.83 m (6ft) lengths and standard BWG 12. The tubes are made from stainless steel type 250 as recommended in the Australian Design Code AS1548 Design of Boilers and Pressure Vessels. 

Safety features for the tank include a pressure relief-valve system on the tank roof, to be opened when draining or adding to the tank contents. A bursting disc system also allows for pressure release in the event of pressure build-up. Amanhole providesaccessto the tank for internal maintenance. The product inlet line is standard nominal pipe size 1.5, schedule number 40S. This inlet is sized for the maximum production flowrates. The product outlet line is of standard nominal pipe size 6, schedule number 120. This line is sized such that a standard-size road tanker may be filled in 15 minutes. 

Inlet line Nominal pipe size 1.5. schedule number 40S Outlet line Nominal pipe size 6, schedule number 120 Manhole, bursting disc, pressure relief valve on roof No insulation... 

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). 

Iron and steel pipes were originally classified on the basis of wall thickness as standard, extra-strong, and double-extra-strong. Modem industrial demands for more exact specifications have made these three classifications obsolete. Pipes are now specified according to wall thickness by a standard formula for schedule number as designated by the American Standards Association. 

For temperatures up to 250°F, the recommended safe working stress is 9000 psi for lap-welded steel pipe and 6500 psi for butt-welded steel pipe. If the schedule number is known, the safe working pressure can be estimated directly from Eq. (14). 

Ten schedule numbers are in use at the present time. These are 10, 20, 30, 40, 60, 80, 100, 120, 140, and 160. For pipe diameters up to 10 in., schedule 40 corresponds to the former standard pipe and schedule 80 corresponds to the former extra-strong pipe. The original double-extra-strong pipe is not represented by a definite schedule number. 

Pipe sizes are based on the approximate diameter and are reported as nominal pipe sizes. Although the wall thickness varies depending on the schedule number, the outside diameter of any pipe having a given nominal size is constant and independent of the schedule number. This permits the use of standard fittings and threading tools on pipes of different schedule numbers. A table showing outside diameters, inside diameters, and other dimensions for pipes of different diameters and schedule numbers is presented in the Appendix. 

The pipe is butt-welded, and its schedule number is 40. Estimate the maximum steam pressure that can be used safely in this pipe. 

For shell diameters up to 24 in., nominal pipe sizes apply to the shell. Inside diameters are usually indicated, and schedule number or wall thickness should also be designated. In general, a shell thickness of f in. is used for shell diameters between 12 and 24 in. unless the fluids are extremely corrosive or the operating pressure on the shell side exceeds 300 psig. 

Here is a inciliod lo esiimate the maximum allowable pressure for ferrous piping according to ASME and ANSI codes without referring to the actual codes stress tables. In addition, specific pipe dimensions (O.D. and thickness) need not be known, as the schedule number and pipe material are all that are necessary. 

It was decided to use a bank of 2-in. schedule 80 pipes in parallel that are 40 ft in length. For pipe schedule 80, the cross-sectional area is 0.0205 ft-. The number of pipes necessary is... 

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