Equipment Costing

1
Equipment Costing

• Chapter 22 (p558-597)
• CH EN 4253
• Terry A. Ring

2
Pumps Electric Motors

• Pump Types (Centrifugal, Gear, Plunger)
• Centrifugal Pump
• Size factor, SQ(Head)0.5
• Base Cost, CBexp(9.2951- 0.6019ln(S)
  0.0519ln(S)2)
• CpFTFMatCB
• Fm materials factor see Table 22.21
• FT pump type factor see Table 22.20
• Other types of pumps have different CB formulas
• Electric Motor to drive pump
• Power consumption, PCPT/?p/?MPB/?MQH?/(33,000?p
  ?M)
• Q flow rate, H head, ? density
• Efficiencies (pump and motor) are a function of
  flow rate or break horsepower (power without any
  losses), respectively
• CBexp5.48660.013141ln(PC)0.053255 ln(PC)2
  0.028628 ln(PC)3-0.0035549ln(PC)4
• CpFTCB
• FT motor types factor see Table 22.22
• ?M90

3
Fans

• Fan
• Sizing factor is the volumetric flow rate, Q
• Different CB formula for different types of fans
• CPFHFM CB
• FH Head factor see Table 22.24
• FM material of construction factor
• Fiberglass 1.8
• Stainless steel 2.5
• Nickel Alloy 5.0
• Motor size by PCQHt(in. water)/(6,350 ?F?M)
• ?M 90

4
Blowers

• Sizing factor is the power consumption, PC
• Centrifugal (turbo) Blower
• CBexp6.65470.7900ln(Pc)
• CPFm-fansCB
• Motor
• Motor size by PCQHt(in. water)/(6,350 ?F?M)
• ?M 90

5
Compressors

• Compressor types
• Centrifugal, CBexp7.22230.80ln(PC)
• Reciprocating, CBexp7.60840.80ln(PC)
• Screw, CBexp7.76610.7243ln(PC)
• Size factor is the power consumed, PCPB/?C
• CPFDriveFMatCB
• FDrive 1(electric motor), 1.15 (steam), 1.25(gas
  turbine)
• FMat 1.0 Carbon steel,2.5 SS, 5.0 Nickel Alloy

6
Heat Exchangers

• Types of Heat exchangers
• Floating, CBexp11.667-0.8709ln(A)0.09005ln(A
  )2
• Fixed Head, CBexp11.0545-0.9228ln(A)0.09861l
  n(A)2
• U-tube, CBexp11.147-0.9186ln(A)0.09790ln(A)
  2
• Kettle, CBexp11.967-0.8709ln(A)0.09005ln(A)
  2
• Thermosiphon, CB
• Double pipe, CBexp7.1248-0.16ln(A)
• Size Factor is HX area, A
• CPFpFMatFLCB
• Pressure Factor, Fp 0.98030.018(P(psig)/100)0.0
  017(P(psig)/100)2
• Not for double pipe
• Materials Factor, Fmatab(A/100), a b from
  Table 22.25
• Tube Length Factor FL 1.25 for 8 ft, 1.0 for 20
  ft. on a sliding scale

7
Fired Heaters

• Size Factor is the heat duty, Q
• CBexp0.085050.766ln(Q)
• CPFPFMatCB
• FP0.986-0.0035(P(psig)\500)0.0175(P/500)2
• Fmat1.4 Cr-Mo alloy steel, 1.7 for stainless
  steel

8
Pressure Vessels

• Storage Tanks
• Distillation Towers
• Tray
• Packed
• Absorber Towers
• Stripping Towers

9
Pressure Vessels

• Sizing Factor is the weight of steel, W
• Horizontal Vessels, 1,000ltWlt920,00 lb
• CBexp8.717-0.2330ln(W)0.4333ln(W)2
• Vertical Vessels, 4,200ltWlt1,000,00 lb
• CBexp6.775-0.18255ln(W)0.02297ln(W)2
• Add Platform Costs,
• Horizontal, 3ltDilt12 ft
• CPL1580(Di)0.20294
• Vertical, 3ltDilt21 ft
• CPL258.1(Di)0.7396(L)0.70684
• Weight, Wp(Dits)(L0.8Di)ts?s
• CFMCBCPL
• FM materials factor see Table 22.26

10
Hoop Stress Calc for thickness, ts

• Design Pressure is function of operating
  pressure, Po
• For Pogt 1,000psig use Pd1.1Po
• For Polt 1,000psig but not for vacuum
• Pdexp0.606080.91615ln(Po)0.0015655ln(Po)2
  
• Thickness
• ts PdDi/(2SE-1.2 Pd)
• S max allowable stress for steel is f(T)
• E weld efficiency (fraction)
• Minimum wall thickness for given diameters
• May add extra thickness for wind, corrosion
• Different calculation for vacuum vessels
• Also account for leakage when vacuum vessel is
  used

11
Distillation Towers

• Pressure vessel with plates or packing and
  additional nozzels and manholes
• Tray Cost
• CTNTFNTFTTFTMCBT
• Nno. trays
• FNT 1 for Ngt20 otherwise FNT2.25/(1.0414NT)
• FTT tray type, 1.0 sieve, 1.87 bubble cap
• FTM Materials, f(D)
• Carbon Steel FTM1.0
• 316 SS FTM1.4010.0788 Di

12
Packed Distillation Column

• Pressure vessel with platforms plus packing
• Packing Cost basis is volume of packing, VP
• CVpCPKCDR
• CPK is installed cost per unit volume
• Distributor cost, CDR

13
Absorbers/Strippers

• Pressure Vessel plus platforms and packing
• Separate costs for blowers
• Separate costs for motors

14
Other process equipment

• Different sizing factors
• Different basis cost equations

15
Other Process Equipment

• Various Size Factors
• Table 22.32