Tags: heat exchanger

Fired Heater Design

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Fired Heater Design

Direct-fired combustion equipment is that in which the flame and/or products of combustion are used to achieve the desired result by radiation and convection. Common examples include rotary kilns and open-hearth furnaces. Indirect-fired combustion equipment is that in which the flame and products of combustion are separated from any contact with the principal material in …

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Plate and Frame Exchangers

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Plate and Frame Exchangers

Plate-and-frame exchangers are an arrangement of gasketed, pressed metal plates aligned on carrying bars and secured between two covers by compression bolts. The pressed metal plates are corrugated in patterns to provide increased surface area, to direct the flow in specific directions, and to promote turbulence. The plates are gasketed such that each of the …

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Double Pipe Heat Exchangers

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Double Pipe Heat Exchangers

A double-pipe exchanger is made up of one pipe containing the tube fluid concentric with another pipe, which serves as the shell. The tube is often finned to give additional surface area. The double-pipe exchanger was developed to fit applications that are too small to economically apply the requirements of TEMA for shell and tube …

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Shell and Tube Heat Exchanger Sizing

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Shell and Tube Heat Exchanger Sizing

The required heat duty, film coefficients, conductivity, etc. for a shell and tube heat exchanger can be calculated using the procedures in Heat Transfer Theory, Approximate U-values are given in Table 2-8. In the basic heat transfer equation it is necessary to use the log mean temperature difference. In Equation 2-4 it was assumed that …

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TEMA Glasses and Tube Materials

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TEMA Glasses and Tube Materials

TEMA standards provide for two classes of shell and tube exchanger qualities. Class C is the less  stringent and is typically used in onshore applications and where the temperature is above ~20°F. Class R is normally used offshore and in cold temperature service. Table 3-2 shows the most important differences between a Class R and …

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Heat Exchanger Placement of Fluid

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The question always comes up of which fluid to put in the tubes and which fluid to put in the shell. Consider placing a fluid through the tubes when: 1. Special alloy materials are required for corrosion control and high temperatures. 2. Fluid is at high pressures. 3. Fluid contains vapors and non-condensable gases. 4. …

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Heat Exchanger Types

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Heat Exchanger Types

There are many different arrangements of the shells, tubes and baffles in heat exchangers. Figure 3-6 is a list of TEMA standard classifications for heat exchangers, which helps to describe the various options. Theseare best understood in conjunction with the example configurations given in Figures 3-7 through 3-9. The first letter designates the front end …

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