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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.
jFixedtubesheet construction with ein OD tube on 15/i6in triangular pitch provides 36 percent more surface.
§Fixedtubesheet construction with 1in OD tube on 1din triangular pitch provides 18 percent more surface.
For an allsteel 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 alloypressure extra is the alloy extra times the shellside pressure extra/100. For channel and floatinghead cover the combined alloypressure extra is the alloy extra times the tubeside pressure extra/100. For tube sheets and baffles the combined alloypressure extra is the alloy extra times the higherpressure extra times 0.9/100. (The 0.9 factor is included since baffle thickness does not increase because of pressure.)
NOTE: To convert poundsforce 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.
jFixedtubesheet construction with ein OD tube on 15/i6in triangular pitch provides 36 percent more surface.
§Fixedtubesheet construction with 1in OD tube on 1din triangular pitch provides 18 percent more surface.
For an allsteel 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 alloypressure extra is the alloy extra times the shellside pressure extra/100. For channel and floatinghead cover the combined alloypressure extra is the alloy extra times the tubeside pressure extra/100. For tube sheets and baffles the combined alloypressure extra is the alloy extra times the higherpressure extra times 0.9/100. (The 0.9 factor is included since baffle thickness does not increase because of pressure.)
NOTE: To convert poundsforce 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 1114 Base Quantity Extra Cost for Tube Gauge and Alloy
Dollars per square foot
TABLE 1114 Base Quantity Extra Cost for Tube Gauge and Alloy
Dollars per square foot

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