by M. L Stoop Chemical Industry, Ltd The Hague, Holland
I COSTS A
W O R K B O O K
Costs of Bubble Plate Towers in Europe
E
F E A T U R E
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D E C A U S E tower costs in chemical plant construction often comprise a large percentage of the total capital installed cost, presented here are some charts plotted from data re cently accumulated for this class of equipment. Curves are idealized, representing average installed costs (U. S. dollars), accurate for cost estimating purposes. For obtaining costs of alloy bubble plates the following ranges of cost factors can be applied to the base carbon steel cost. Metal
Factor Range
410 S S 304 SS
1.6-2.3 2.0-2.5
2.2-3.0 3.0-4.0 Monel Factor selected varies approximately with size of bubble plate. 316 SS
Similarly, installed costs for alloy towers can be factored from carbon steel costs, using the following table. Here too factors are approximately proportional to size and thickness of towers. The range of factors can be explained on the basis that labor for assembling towers remains substan tially constant with size. Further more there is no difference in erec tion costs for a carbon steel tower or an alloy tower, but there is a great difference in purchase costs between them.
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Tensile strength
Metal 410 304 316 Monel
Towers of equal wall thickness 2.7-3.4 3.3-4.4 3.6-5.0 4.7-6.5
17.750 17.750 19.750 10.750
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W e i g h t s o f b u b b l e plates in pounds p e r t r a y f o r indicated diameters a n d thicknesses
Mill
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P'R'ICÉ'P'ER'BU ÎBL.E PI
'A-inch cladding on C.S. base material 2.2-2.8 2.3-3.0 2.6-3.4 2.9-3.8
2
DIAMETER IN FEET
III
Factors Extra tensile strength specification 2.3-3.0 2.5-3.5 3.0-3.8 3.8-5.2
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Number o f b u b b l e caps p e r t r a y f o r varying tray and bubble cap diam eters
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DIAMETER IN FEET
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11 Mil
III 1 111 Mil
DIAMETER IN FEET
C a r b o n steel t o w e r shell installed costs per f o o t o f height f o r diameters a n d w a l l thicknesses indicated (including nozzles, manways, 2 disked heads, a n d supports)
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S 6 7 8 9 10' DIAMETER I N F E E T
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Installed costs o f c a r b o n steel b u b b l e ptates
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W
O R K B O O K F E A T U R E S 71 A
