Pressure chart

Maxwell, J.B. and L.S. Bonnel (1955), Vapor pressure charts for petroleum engineers. Esso Research and Engineering Co., NJ. 

Appendixes Appendix 1 defines the basis used for defining stress-intensity values. Appendix 2 contains external-pressure charts, and Appendix 3 has the rules for bolted-flange connec tions these two are exact duplicates of the eqiiivalent appendixes in Division 1. 

The widespread availabihty and utihzation of digital computers for distillation calculations have given impetus to the development of analytical expressions for iregression equation and accompanying regression coefficients that represent the DePriester charts of Fig. 13-14. Regression equations and coefficients for various versions of the GPA convergence-pressure charts are available from the GPA. 

It follows then, that knowing the stoichiometry and having a vapor pressure chart, one can determine the LEL and flash point. Also if either the LEL or flash point is known, a vapor pressure chart can be used to estimate the other. 

These physical property tables give three vapor pressure points that can be connected on your favorite Cox type vapor pressure chart for a quick approximation of the whole range. These three points are ... 

T, = Inlet temperahire at relieving conditions, K. Note For the special case where a PR valve is being sized for fire, T, may be estimated by raising the midboiling point of the liquid to the inlet pressure P, using vapor pressure charts. 

A vaporizer is to heat the mixture to 190°F at 110 psia. Data from vapor pressure charts such as [48] ... 

Use the vapor composition and the Clausius/Clapeyron equation in reverse to roughly estimate AHvap. This requires two points on the vapor pressure chart. 

P = pressure at a selected point on vapor pressure chart... 

Brown, G. G., and Badger, P. A., Brown-Coats Vapor Pressure Chart for Hydrocarbons, ... 

The chart shown in Fig. 3.4, is called a Cox, or vapor-pressure, chart. It shows the pressure developed by pure-component liquids, at various temperatures. The interesting aspect of this chart is that the sloped... 

Temperature, F (non-linear scale) Figure 9.1 Vapor-pressure chart. 

Are we missing the pressure PT in the flash drum shown in Fig. 9.2 Let s calculate this pressure, using the bubble-point equation and the vapor pressure chart shown in Fig. 9.1 ... 

A rapid and easily applicable method has been found for indicating the effect of pressure on the composition and boiling point of an azeotropic system. The method is based on the use of the Cox vapor pressure chart (I) on which the log of vapor pressure is plotted as a function of l/(t° C. + 230) to give a straight line over a wide range of pressures. 

Generally, a heat-transfer fluid should be noncorrosive to carbon steel because of its low cost. Carbon steel may be used with all the organic fluids, and with molten salts up to 450°C (842 °F) [6]. With the sodium-potassium alloys, carbon, and low-alloy steels can be used up to 540°C (1000 F), but above 540°C stainless steels should be used [6]. Stainless steels contain 12 to 30% Cr and 0 to 22% Ni, whereas a steel containing small amoimts of nickel and chromium, typically 1.85% Ni and 0.80% Cr, is referred to as a low alloy steel [6]. Cryogenic fluids require special steels. For example, liquid methane requires steels containing 9% nickel. To aid in the selection of a heat-transfer fluid. Woods [28] has constracted a tenperature-pressure chart for several fluids. 

Line up point B figured in step 3 with another pressure (chart C)... 

The bubble-point temperature may be calculated by trial and error as the value of Tbp that satisfies this equation all that is needed is a set of relationships for p T), such as the Antoine equation or vapor-pressure charts or tables. Once Tbp is known, the composition of the vapor phase can easily be determined by evaluating the partial pressures of each component from Equation 6.4-3 and determining each vapor-phase mole fraction as y, = pj P. 

Examine the volume-pressure chart for toluene in Appendix J, Fig. J.l. If a cylinder contains toluene with a volume of 2.1 ftVlb mol at a pressure of 30 psia, is the toluene all liquid, all vapor, or a mixture of the two phases ... 

The use of shortcut methods to estimate vapor/liquid equilibria is best illustrated by the following example where the only estimating tool you have is a vapor pressure chart. 

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