Pipe sizes

Vortex precession meters feature no moving parts and a relatively high frequency digital output. They are used in the measurement of gas and Hquid flows, generally in pipe sizes 80 mm and smaller. 

With respect to pipe size, piping systems may be divided into the following three classes. 

In order to select the pipe size, the pressure loss is calculated and velocity limitations are estabHshed. The most important equations for calculation of pressure drop for single-phase (Hquid or vapor) Newtonian fluids (viscosity independent of the rate of shear) are those for the deterrnination of the Reynolds number, and the head loss, (16—18). 

The first five methods are apphcable only after rigorous circuit analysis and when piping layouts and isometric drawings or scale models are available for quantity takeoff (e.g., pipe size, length, and specification, flanges and valve count, etc.). 

The Dickson N method [R. A. Dickson, Chem. Eng., 54, 121-123 (November 1947)] is a variation of the detailed price takeoff. Various circiiits for each type of pipe are completely priced for a base size. Another chart gives an N faclor for all other pipe sizes. Multiplying the cost of the circuit for the base size by the appropriate N factor yields the estimated cost of the new circuit of the desired pipe size. The method depends for its accuracy on periodic repricing of the base-size circiiits in order to keep the base charts up to date. 

Figure 9-42 is a plot of the number of labor-hours of field erec tion time per joint against the nominal pipe size of shop-fabricated carbon steel and low-alloy pipe. The unit of work measurement used in this... 

Nominal pipe size, in Outside diameter, in Schedule no. Wall thickness, in Inside diameter, in Cross-sectional area Circumference, ft, or surface, fF/ft of length Capacity at 1-ft/s velocity Weight of plain-end pipe, Ih/ft... 

Iron Pipe, ANSI B36.10—1975, with permission of the same pubhsher. Decimal thicknesses for respective pipe sizes represent their nominal or average wall dimensions. Mill tolerances as high as 121/4 percent are permitted. 

Nominal pipe size Outside diameter of flange Thickness of flange, minimum Diameter of holt circle Diameter of holts No. of holts Length through huh ... 

Expanded joints (Fig. 10-138) are confined to the smaller pipe sizes of ductile metals. A smooth finish is required on the outside of the pipe and on the faces of the ridges inside the bore. Pipe and bore must have the same coefficient of thermal expansion. Furthermore, it is essential that the pipe metal have a lower yield point than the metal... 

Standard pipe size, in Nominal outside diameter, in (mm) Average outside diameter tolerances, in (mm), all minusf Nominal wall thickness, in (mm) Tolerance, in (mm)f Theoretical weight, Ih/ft (kg/m) Theoretical weight, Ih/ft (kg/m)... 

Standard pipe size, in Inside diam. after lining, in Thickness of lining, in Weight, per ft, Ih Standard pipe size, in Inside diam. after lining, in Thickness of lining, in Weight per ft, Ih... 

Pipe size, in (mm) Pipe outside diameter, in (mm) Cone outside diameter, in (mm) Wall thickness, in (mm) Cone angle. Approximate weight per foot, lb (kg)... 

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