Calc Example (Imper) HOT WATER

8/14/2019 Calc Example (Imper) HOT WATER

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Table 1 Friction loss for all pipe segments.

SECTION

L1 500 6 5.68

L2 500 6 5.68

L3 500 6 5.68

L4 500 6 5.68

L5 500 4 12.77

L6 400 4 10.22

- - -

L7 400 4 10.22

- - -

Table 2. Friction loss for fittings.

SECTION FLOW (Usgal/min) TYPE QTY

L1 500 Entrance 1

L1 500 Butterfly 1

L2 500 Butterfly 1

L3 500 Butterfly 2

L3 500 Elbows 2

L4 500 Elbows 5

L4 500 Butterfly 1

L5 500 Elbows 4L5 500 Tee 1

L6 400 Elbows 3

- - -

L7 400 Pipe exit 1

- - -

Table 3. Friction loss of the equipment.

FLOW(Usgal/min)

DIA(in)

VELOCITY(ft/s)

Sub-total HFP1-7

Total HFP1-2

Sub-total HFF1-7

Total HFF1-2


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Note: p control valve = 10 ft fluid


L2 500 Filter 1

L3 500 1

L7 400 1

Table 4. Pressure head loss due to the check valve

TYPE FLOW (Usgal/min) QTY DIA (in)

Tilting disc 500 1 6

Total static head

2803 2841 38.00

Velocity head difference between the outlet and inlet of the system

0 0 0.00 0.00

Tank pressure head difference between the outlet and inlet of the system

H1 H2 H2 H1 (ft fluid)

0 0 0.00

Table 5. Summary of the calculation results of the total head.

Component Sign (ft fluid) Results

Pipe friction head loss + 16.78

Heatexchanger

Controlvalve

TotalH

EQ1-2

z1

z2

z2-z

1(ft fluid)

v1

v2

v12/2g v

22/2g

HFP1-2


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Fittings friction head loss + 12.18

Equipment friction head l + 28.86

Check valve head loss + 1.69

Total static head + 38.00

Velocity head difference + 0.00

Tank pressure head differ + 0.00

Total head (ft fluid) = 97.52

Table 6 Power to the pump shaft calculation results

0.98 97.52 500 0.71

Table 7 Summary of the pump data.

Pump Manufacturer Goulds

Pump Model 3175 3X6-12

Type End suction, direct drive

Suction dia. (in) 6

Discharge dia. (in) 3

Impeller speed (rpm) 1750

Operating head (ft) 97.3

Operating Flow (Usgpm) 500

Pump efficiency (%) 71.3

Predicted efficiency (%) 77

Specific speed

Suction specific speed

Temperature rise (F)

Fluid type Water

Viscosity (cSt) 1.1

Temperature (F) 150

Specific gravity 0.98

Specific heat (Btu/lb-F) 1

Brake horsepower (hp) 16.9

Selected horsepower (hp) 20

Frame 256 T

Pump shut-off head (ft) 122

52

NPSH required (ft abs.) 6NPSH available (ft abs.) 15.3

Max. impeller size (in) 12

HFF1-2

HEQ1-2

HCHECK

z2

z1

v22/2g v

12/2g

H1

H2

HP

SPECIFICGRAVITYSG

TOTALHEADH

P(ft fluid)

FLOWq(Usgal/min)

PUMPEFFICIENCY

System high point (ft) zhigh


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Min. impeller size (in) 9

Selected impeller size (in) 10.7

Calculate the N.P.S.H. available and check against the N.P.S.H. required

Table 8 Pressure head loss due to pipe friction

SECTION

L1 500 6 5.68

L2 500 6 5.68

- - -

Table 9 Pressure head loss due to fittings friction


L1 500 Entrance 1L1 500 Butterfly 1

L2 500 Butterfly 1

- - -

Table 10 Pressure head loss due to equipment


L2 500 Filter 1

Suction static head

2803 2802 1.00

N.P.S.H.avail.

( ft fluid ab.s ) = HS

+ HA

Hva

HS

= -(HF1-S

+HEQ-S

) + v1

2/2g + (z1-z

s+ H

1)

N.P.S.H.avail.( ft fluid abs ) = -(HFP1-S

+ HFF1-S

+HFEQ1-S

) + v1

2/2g + (z1-z

s+ H

1) +

FLOW

(Usgal/min)

DIA

(in)

VELOCITY

(ft/s)

Total HFP1-S

Total HFF1-S

TotalH

EQ1-2

z1

zS

z1-z

S(ft fluid)


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Tank pressure head at the inlet of the system

0

Velocity head at the inlet of the system

0 0.00

Atmospheric pressure head

SG

13.3 0.98 31.35

Vapor pressure head

SG

3.6 0.98 8.49

Table 11. Summary of the calculation results of the N.P.S.H. available.


Pipe friction head loss - 0.10

Fittings friction head loss - 1.50

Equipment friction head l - 7.07

Suction static head + 1.00

Tank pressure head + 0

Velocity head + 0.00

Atmospheric pressure hea+ 31.35

Vapor pressure head - 8.49

= NPSH 15.19

Calculate the pressure ahead of the control valve using method 1

H1

(ft fluid)

v1

v12/2g (ft fluid)

pA(psia) H

A(ft fluid abs.)

pva

(psia) Hva

(ft fluid abs.)

HFP1-S

HFF1-S

HEQ1-S

z1-z

S

H1

v12/2g

HA

Hva

NPSHavail.

(ft fluid abs.)

HX = HP -(HFP1-X + HFF1-X + HFEQ1-X) + 1/2g (v12- vX2 )+ (z1 + H1 +zx )

H7

= HP

-(HFP1-7

+ HFF1-7

+ HFEQ1-7

) + 1/2g (v1

2- v7

2 )+ (z1+ H

1+

z

7)


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SECTION

L1 500 6 5.68

L2 500 6 5.68

L3 500 6 5.68

L4 500 6 5.68

L5 500 4 12.77

L6 400 4 10.22

- - -

Table 13. Pressure head loss due to fittings friction

SECTION FLOW (Usgal/min) TYPE QTYL1 500 Entrance 1

L1 500 Butterfly 1

L2 500 Butterfly 1

L3 500 Butterfly 2

L3 500 Elbows 2

L4 500 Elbows 5

L4 500 Butterfly 1

L5 500 Elbows 4

L5 500 Tee 1

L6 400 Elbows 3

- - -

Table 14. Pressure head loss due to equipment



L2 500 Filter 1

L3 500 1

Table 15. Pressure head loss due to the check valve

TYPE FLOW (Usgal/min) QTY DIA (in) Tilting disc 500 1 6

FLOW(Usgal/min)

DIA(in)

VELOCITY(ft/s)

Sub-total HFP1-7

Sub-total HFF1-7

Heatexchanger

TotalH

EQ1-7


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Static head

2803 2846 -43.00

Velocity head difference between points 1 and 7

0 10.22 0.00 1.62

Tank pressure head at the inlet of the system

0

Table 16 Summary of the results of the pressure calculation at point 7.


Total head + 9

Pipe friction head loss - 16.27

Fittings friction head loss - 10.56

Equipment friction head l - 18.86

Check valve head loss - 1.69

Total static head + -43.00Velocity head difference + v2 1/2g v7 2/2g -1.62

Tank pressure head + 0

= 5.51

= 2.34

Metod 2


SECTION

L7 400 4 10.22

- - -

z1

z7

z1-z

7(ft fluid)

v1

v7

v12/2g v

72/2g

H1

(ft fluid)

HP

HFP1-7

HFF1-7

HEQ1-7

HCHECK

z1 z7

H1

Pressure headat the control valve (ft

H7

Pressureat the control valve (psig)

p7

H7

= HFP7-2

+ HFF7-2

+ HFEQ7-2

+ 1/2g (v2

2- v7

2 ) + (z2+ H

2-z

7)

FLOW(Usgal/min)

DIA(in)

VELOCITY(ft/s)

Total HFP7-2


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Table 18. Pressure head loss due to fittings friction


L7 400 Pipe exit 1

- - -

Table 19. Pressure head loss due to equipment



L7 400 1

Total static head

2846 2841 -5.00

Velocity head difference between points 7 and 2

10.21 0 1.62 0.00

Tank pressure head at the outlet of the system

H2

0

Calculation results (method 2 pressure at the control valve inlet

Table 20 Results of the pressure calculation at point 7.


Pipe friction head loss + 0.51

Fittings friction head loss + 1.62

Equipment friction head l + 10.00

Static head + -5.00

Velocity head difference + -1.62

Tank pressure head differ + 0.00

Total HFF1-2

Controlvalve

TotalH

EQ7-2

z7

z2

z2-z

7(ft fluid)

v7

v2

v72/2g v

22/2g

HFP7-2

HFF7-2

HEQ7-2

z2 z7v

22/2g v

72/2g

H2


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= 5.51

= 2.34

Pressure head at thecontrol valve (ft of fluid)

H7

Pressure at the controlvalve

p7


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1.64 4 0.07

1.64 2 0.03

1.64 24 0.39

1.64 20 0.33

13.1 40 5.24

8.51 120 10.21

- - 16.27

8.51 6 0.51

- - 16.78

DIA (in) VELOCITY (ft/s)v2/2g (ft fluid) K

6 5.68 0.50 1 0.50

6 5.68 0.50 1 0.50

6 5.68 0.50 1 0.50

6 5.68 0.50 1 1.00

6 5.68 0.50 0.28 0.28

6 5.68 0.50 0.28 0.70

6 5.68 0.50 1 0.50

4 12.77 2.53 0.32 3.244 12.77 2.53 0.7 1.77

4 10.22 1.62 0.32 1.56

- - - - 10.56

4 10.22 1.62 1 1.62

- - - - 12.18

HFP

/L

(ft/100 ft pipe)

L(ft)

HFP

(ft fluid)

HFF

(ft fluid) = K x v2(ft/ s)2 / 2g(ft/s)2

HFF

(ft fluid)


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p (psi) SG p (ft fluid)

3 0.98 7.07 7.07

5 0.98 11.79 11.79

4.24 0.98 10.00 10.00

28.86

SG p (psi)

0.98 590 0.72 1.69

0.00

HEQ(ft fluid)

CV (gpm/psi-1/2 Hcheck(ft fluid) http://www.engine

CV = q/ (p/S

v22/2g v

12/2g (ft fluid)
http://www.engineeringtoolbox.com/flow-coefficients-d_277.htmlhttp://www.engineeringtoolbox.com/flow-coefficients-d_277.html


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16.92

BRAKEHORSEPOWERP(hp)

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1.64 4 0.07

1.64 2 0.03

- - 0.10


6 5.68 0.50 1 0.506 5.68 0.50 1 0.50

6 5.68 0.50 1 0.50

- - - - 1.50


3 0.98 7.07 7.07

7.07

A- H

va

HFP

/L

(ft/100 ft pipe)

L

(ft)

HFP

(ft fluid)

HFF

(ft fluid)

HEQ

(ft fluid)


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N.P.S.H.avail.( ft fluid abs ) = -(HFP1-S

+ HFF1-S

+HFEQ1-S

) + v1

2/2g + (z1-z

s+ H

1) + H


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1.64 4 0.07

1.64 2 0.03

1.64 24 0.39

1.64 20 0.33

13.1 40 5.24

8.51 120 10.21

- - 16.27

DIA (in) VELOCITY (ft/s)v2/2g (ft fluid) K6 5.68 0.50 1 0.50

6 5.68 0.50 1 0.50

6 5.68 0.50 1 0.50

6 5.68 0.50 1 1.00

6 5.68 0.50 0.28 0.28

6 5.68 0.50 0.28 0.70

6 5.68 0.50 1 0.50

4 12.77 2.53 0.32 3.24

4 12.77 2.53 0.7 1.77

4 10.22 1.62 0.32 1.56

- - - - 10.56


3 0.98 7.07 7.07

5 0.98 11.79 11.79

18.86

SG p (psi)0.98 590 0.72 1.69

HFP

/L

(ft/100 ft pipe)

L(ft)

HFP

(ft fluid)

HFF (ft fluid)

HEQ(ft fluid)

CV (gpm/psi

-1/2

H

check

(ft fluid)


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-1.62

8.51 6 0.51

- - 0.51

v12/2g v

72/2g (ft fluid)

H7

= HP

-(HFP1-7

+ HFF1-7

+ HFEQ1-7

) + 1/2g (v1

2- v7

2 )+ (z1+ H

1+

z

7)

HFP

/L

(ft/100 ft pipe)

L(ft)

HFP

(ft fluid)


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4 10.22 1.62 1 1.62

- - - - 1.62


4.24 0.98 10.00 10.00

10.00

-1.62

HFF7-2

(ft fluid

HEQ7-2

(ft fluid)

v22/2g v

72/2g (ft fluid)

H7

= HFP7-2

+ HFF7-2

+ HFEQ7-2

+ 1/2g (v2

2- v7

2 ) + (z2+ H

2-z

7)


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Specified Data

C = Hazen-Williams roughness constant 141Stainless

Q = volume flow (gal/min) 500

dh = inside or hydraulic diameter (inches) 6

Calculated Pressure Loss

f = friction head loss in feet of water per 100 feet of pipe (ft H20 per 100 ft pipe) 1.80

Calculated Flow Velocity

v = flow velocity (ft/s) 5.68

g = 32.174 ft/s2


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eringtoolbox.com/flow-coefficients-d_277.html

)1/2
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va


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Pipe Water Loss Calculation for Water

Based on Darcy-Weisbach Kinematic Viscosity (ft2/sec) at 75F

hf=f*L/D*v^2/2g Roughness of StSt Pipe/ Tubing (ft)

Specific Gravity of Fluid

CHECK !!! :Valid for Relative Roughness 10^-6 to 10^-2 and Reynolds Number 5000 to 10^

Pipe Nominal Diameter 6.00

Pipe Length (ft) 4

Pipe Inside Diameter (in) 6.07 OK

Flow Rate (gpm) 500.00 Reynolds Number to low: Res

Kinematic viscosity (ft2/sec) 0 #VALUE!

Roughness (ft) 0 #VALUE!

Total Equivalent Length 4

Relative Roughness #VALUE! dimensionless

Velocity (fps) 5.55

Reynolds Number 0 dimensionless

friction factor #VALUE! dimensionless

friction head loss (ft) 0


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0.00001 0

0.00005 0

1.02

lts Invalid - Results Invalid

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Pipe Water Loss Calculation for Water

Based on Darcy-Weisbach Kinematic Viscosity (ft2/sec) at 75F 0

hf=f*L/D*v^2/2g Roughness of StSt Pipe/ Tubing (ft) 0

Specific Gravity of Fluid 1.02

CHECK !!! :Valid for Relative Roughness 10^-6 to 10^-2 and Reynolds Number 5000 to 10^8

Pipe Nominal Diameter 6.00

Pipe Length (ft) 4

Pipe Inside Diameter (in) 6 OK

Flow Rate (gpm) 500.00 OK

Kinematic viscosity (ft2/sec) 0 OK

Roughness (ft) 0 OK

Total Equivalent Length 4

Relative Roughness 0 dimensionless

Velocity (fps) 5.67

Reynolds Number 306236.78dimensionless

friction factor 0.02dimensionless

friction head loss (ft) 0.06


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0.0000093

0 SS

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ematic-viscosity-d_412.html

Calc Example (Imper) HOT WATER

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