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•Modified from E. N. Sieder and G. H. Elliot, Pet. Refiner, 39(5), 223 (1960).

fTotal extra is 0.7 x pressure extra on shell side plus 0.3 x pressure extra on tube side.

jFixed-tube-sheet construction with e-in OD tube on 15/i6-in triangular pitch provides 36 percent more surface.

§Fixed-tube-sheet construction with 1-in OD tube on 1d-in triangular pitch provides 18 percent more surface.

For an all-steel heat exchanger with mixed design pressures the total extra for pressure is 0.7 x pressure extra on shell side plus 0.3 x pressure extra tube side.

For an exchanger with alloy parts and a design pressure of 150 lbf/in2, the alloy extras are added. For shell and shell cover the combined alloy-pressure extra is the alloy extra times the shell-side pressure extra/100. For channel and floating-head cover the combined alloy-pressure extra is the alloy extra times the tube-side pressure extra/100. For tube sheets and baffles the combined alloy-pressure extra is the alloy extra times the higher-pressure extra times 0.9/100. (The 0.9 factor is included since baffle thickness does not increase because of pressure.)

NOTE: To convert pounds-force per square inch to kilopascals, multiply by 6.895; to convert square feet to square meters, multiply by 0.0929; and to convert inches to millimeters, multiply by 25.4.

•Modified from E. N. Sieder and G. H. Elliot, Pet. Refiner, 39(5), 223 (1960).

fTotal extra is 0.7 x pressure extra on shell side plus 0.3 x pressure extra on tube side.

jFixed-tube-sheet construction with e-in OD tube on 15/i6-in triangular pitch provides 36 percent more surface.

§Fixed-tube-sheet construction with 1-in OD tube on 1d-in triangular pitch provides 18 percent more surface.

For an all-steel heat exchanger with mixed design pressures the total extra for pressure is 0.7 x pressure extra on shell side plus 0.3 x pressure extra tube side.

For an exchanger with alloy parts and a design pressure of 150 lbf/in2, the alloy extras are added. For shell and shell cover the combined alloy-pressure extra is the alloy extra times the shell-side pressure extra/100. For channel and floating-head cover the combined alloy-pressure extra is the alloy extra times the tube-side pressure extra/100. For tube sheets and baffles the combined alloy-pressure extra is the alloy extra times the higher-pressure extra times 0.9/100. (The 0.9 factor is included since baffle thickness does not increase because of pressure.)

NOTE: To convert pounds-force per square inch to kilopascals, multiply by 6.895; to convert square feet to square meters, multiply by 0.0929; and to convert inches to millimeters, multiply by 25.4.

TABLE 11-14 Base Quantity Extra Cost for Tube Gauge and Alloy

Dollars per square foot

TABLE 11-14 Base Quantity Extra Cost for Tube Gauge and Alloy

Dollars per square foot

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