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Piping Loss Calculations: Input Values Head Loss, Given Piping and Flow

The document discusses head loss calculations for 4-inch and 6-inch pipes with laminar and turbulent flow. For turbulent flow, the 4-inch pipe has a head loss of 39 meters and costs $71,401 in the first year, while the 6-inch pipe has a head loss of 4.7 meters and costs $59,630. For laminar flow, the 4-inch pipe has a head loss of 22.7 meters and costs $60,200, while the 6-inch pipe has a head loss of 3.6 meters and costs $58,874. The 6-inch pipe is determined to be the most economical choice in both cases.

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jhon smith
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46 views1 page

Piping Loss Calculations: Input Values Head Loss, Given Piping and Flow

The document discusses head loss calculations for 4-inch and 6-inch pipes with laminar and turbulent flow. For turbulent flow, the 4-inch pipe has a head loss of 39 meters and costs $71,401 in the first year, while the 6-inch pipe has a head loss of 4.7 meters and costs $59,630. For laminar flow, the 4-inch pipe has a head loss of 22.7 meters and costs $60,200, while the 6-inch pipe has a head loss of 3.6 meters and costs $58,874. The 6-inch pipe is determined to be the most economical choice in both cases.

Uploaded by

jhon smith
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Piping Loss Calculations Turbulent Flow Solution

Input Values Head Loss, given


piping and flow
4" sch 80 6" sch 80
Pipe ID 0.0972 m Velocity 2.70 D= 0.0972 0.1541
Roughness 5E-05 m Re 2.62E+03 W= 22.3 kg/m 28.2
Length 200 m Geuss f 0.02000 hf= 39 m 4.7
Sum(K) 11 Iterate 0.05363
f to 0.04459 Pw=rho g HQ 19122 W 2304
Density 2500 kg/m^3 improve 0.04609 Ps=Pw/efficiency 38243 W 4609
Kin Visc 0.0001 m^2/s 0.04581 /1000 W/kW 38 kW 5
Final f 0.04586 *24*365 hrs/year 335012 kW/hr/year 40373
*$0.08/kWhr 26801 $/year 3230
Head 100.0 m Head 39.0
Flow 0.02000 m^3/s Flow 0.02000 Mass of pipe 4460 5640
Cost of Pipe 44600 56400

Power + Initial cost Year 1 71401 59630


adjusted to present value at 8% Power/1.08 Year 2 24816 2991
Power/1.08^2 Year 3 22978 2769

Total 119194 65390

The 6 inch pipe is most economical

Piping Loss Calculations Laminar Flow Solution


Input Values Head Loss, given
piping and flow
4" sch 80 6" sch 80
Pipe ID 0.0972 m Velocity 2.70 D= 0.0972 0.1541
Roughness 5E-05 m Re 2.62E+03 W= 22.3 kg/m 28.2
Length 200 m Geuss f hf= 22.7 m 3.6
Sum(K) 11 Iterate
f to Pw=rho g HQ 11130 W 1765
Density 2500 kg/m^3 improve Ps=Pw/efficiency 22260 W 3530
Kin Visc 0.0001 m^2/s /1000 W/kW 22 kW 4
Final f 0.02443 *24*365 hrs/year 194994 kW/hr/year 30924
*$0.08/kWhr 15600 $/year 2474
Head 100.0 m Head 22.7
Flow 0.02000 m^3/s Flow 0.02000 Mass of pipe 4460 5640
Cost of Pipe 44600 56400

Power + Initial cost Year 1 60200 58874


adjusted to present value at 8% Power/1.08 Year 2 14444 2291
Power/1.08^2 Year 3 13374 2121

Total 88018 63286

The 6 inch pipe is most economical

The most realistic assumption is probably laminar flow in the 6 inch pipe and turbulent flow in the 4 inch pipe.

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