calc p drop gas1

8/13/2019 Calc p Drop Gas1

http://slidepdf.com/reader/full/calc-p-drop-gas1 1/7

Table A. Equivalent length, (L/D ) EQ of valves and pipe fittings.

No. Item name & type Condition (L/D) EQ No. Item name & type Condition (L/D) EQ

1 Globe valve 6 Butterfly valve Fully open 40A Plug type seat Fully open 340B No bevel w/pin guide Fully open 450 7 Cock valveC Y patern 60 degrees Fully open 175 A Straight Fully open 18D 45 degrees Fully open 145 B Three way, straight flow Fully open 44

C Three way, to branch Fully open 1402 Angle valve

A Plug type seat Fully open 145 8 ElbowB No bevel w/pin guide Fully open 200 A LR 90 degrees 20

B SR 90 degrees 303 Gate valve C SR 45 degrees 16

A Wedge, double, plug disc Fully open 13B 1/2 open 260 9 Standard TeeC 1/4 open 900 A Straight flow 20

B To branch 604 Check valve

A Swing 135 10 Street ElbowB Clearway swing 50 A 90 deg. 50C Globe, lift or step 340 B 45 deg. 26D Angle, lift or step 145E In line ball check valve 150 11 Single mitter bend

A 45 deg. 155 Foot valve B 90 deg. 58

A With strainner & poppet 420B With leather hinged 75 12 Return bend 50

Table B. Flow Resistance, K for several geometriesNote : (D1/Do) 2 or (D2/Do) where D1 or D2 is smaller diameter and flow is referred to upstream

No. Item name & type Condition K No. Item name & type Condition K

(D1/Do)2

D2/Do

1 Reducer 0.1 0.37 Open end (to ambient or infinite end space)0.5 0.220.9 0.02 7 Nozzle ( angle 7 - 15 deg.) 0.4 45

0.6 8.52 Sudden contraction 0 0.5 0.8 2.5

0.5 0.250.9 0.05 8 Sharp nozzle 0.2 70

0.5 103 Sudden enlargement 0 1 0.9 1

0.5 0.250.9 0.01 9 Mitter bend Lb/D

0 1.24 Orifice or perforated plate 0.2 50 2 0.4

0.5 3.9 6 0.470.9 0.15

Or separated sheet calculation5 Infinite contraction 0 0.5

6 Infinite enlargement 0 1

Lb

Do D1

DoD1

D2Do



Item Unit Qty. Piping system componentsNumber of piping system components

1 Gas data Valve & fittings2 Gas name Air Item code no. (L/D)i EQ Qty.

3 Volume flow (m3/hr) m3/hr 120 340 A.1.A 340 1

4 Pressure kg/cm2A 5 0 A.1.B 450 05 Temperature C 40 0 A.1.C 175 0

6 K 313.16 0 A.1.D 145 0

7 Viscosity cP 0.02 0 A.2.A 145 0

8 MW 28.97 0 A.2.B 200 0

9 k 1.4 26 A.3.A 13 2

10 Pcr kg/cm2A 38.454 0 A.3.B 260 0

11 Tcr K 132.8 0 A.3.C 900 0

12 Pred 0.130 0 A.4.A 135 0

13 Tred 2.358 0 A.4.B 50 0

14 Z, from chart 1 0 A.4.C 340 0

15 R 0.29 0 A.4.D 145 0

16 Density kg/m3 5.46 0 A.4.E 150 017 0.9 a = 0.9 (1000.k.T.Z.R) 0.5

m/s 319.2 0 A.5.A 420 0

18 Pipe data 0 A.5.B 75 0

19 Inside pipe diameter, D mm 52.48 0 A.6 40 020 Pipe length, L m 50 0 A.7.A 18 021 Inside surface roughness, mm 0.045 0 A.7.B 44 022 Material surface roughness data 0 A.7.C 140 023 Material 0 A.8.A 20 024 Drawn tube, glass, plastic 0 A.8.B 30 025 Forged, structural steel 0 A.8.C 16 026 Commercial s teel 0 A.9.A 20 027 Galvanized iron 0 A.9.B 60 028 Cast iron 0 A.10.A 50 029 Concrete new smooth/coarse 0 A.10.B 26 030 Water mains, old 0 A.11.A 15 031 Sewer, ol d 0 A.11.B 58 032 0 A.12 50 033 Pressure drop calculation 0 Other 0 034 Pipe (L/D) 952.74 Total (L/D) EQ

35 Gas velocity in pipe, V m/s 15.40836 Reynold no., Re 2.21E+08 Other restriction component37 Relative roughness, /D 0.000857 Item code no. Ki Qty.38 Friction factor, f 0.02 0 B.1 0 039 Pressure drop, P LOSS kg/cm2 0.316 0.5 B.2 0.5 140 Check gas velocity at valve/orifice 1 B.3 1 141 Globe vlv seat, full open m/s 40.2 20 B.4 20 142 OK 0 B.5 0 043 Gate, …….% open,(L/D)eq.&vel 260 35.1 0 B.6 0 044 OK 0 B.7 0 045 Orifice, K & vel . 20 68.91 0 B.8 0 046 OK 0 B.9 0 0

47 Note : Velocity at smallest area V1 = 0.9 a {f(L/D)} 0.5 for 0 Other 0 048 valves and V1 = 0.9 a (K) 0.5 for orifice Total flow resistance, K

49

0.0450.150.25

(mm)

21.5

PRESSURE DROP CALCULATION SHEETFOR GAS

366

0.0015 - 0.00250.025

0.025/0.2513




1 Gas data Valve & fittings2 Gas name CO2 Item code no. (L/D)i EQ Qty.


4 Pressure kg/cm2A 16 0 A.1.B 450 05 Design P kg/cm2 2 0 A.1.C 175 0

6 Temperature C 40 0 A.1.D 145 0

7 K 313.16 0 A.2.A 145 0

8 Viscosity cP 0.015 0 A.2.B 200 0

9 MW 44.01 26 A.3.A 13 2

10 k 1.3 0 A.3.B 260 0

11 Pcr kg/cm2A 74 0 A.3.C 900 0

12 Tcr K 304.4 0 A.4.A 135 0

13 Pred 0.216 0 A.4.B 50 0

14 Tred 1.029 0 A.4.C 340 0

15 Z, from chart 0.93 0 A.4.D 145 0

16 R 0.19 0 A.4.E 150 0

17 Density kg/m3 28.53 0 A.5.A 420 0

18 0.9 a = 0.9 (1000.k.T.Z.R) 0.5m/s 240.7 0 A.5.B 75 0

19 Pipe data 0 A.6 40 020 Inside pipe diameter, D mm 77.92 0 A.7.A 18 021 Pipe length, L m 65 0 A.7.B 44 022 Inside surface roughness, mm 0.045 0 A.7.C 140 023 Material surface roughness data 220 A.8.A 20 1124 Material 0 A.8.B 30 025 Drawn tube, glass, plastic 0 A.8.C 16 026 Forged, structural steel 120 A.9.A 20 627 Commercial s teel 0 A.9.B 60 028 Galvanized iron 0 A.10.A 50 029 Cast iron 0 A.10.B 26 0

30 Concrete new smooth/coarse 0 A.11.A 15 031 Water mains, old 0 A.11.B 58 032 Sewer, ol d 0 A.12 50 033 0 Other 0 034 Pressure drop calculation Total (L/D) EQ

35 Pipe (L/D) 834.1936 Gas velocity in pipe, V m/s 17.473 Other restriction component37 Reynold no. in pipe, Re 2.59E+09 Item code no. Ki Qty.38 Relative roughness, /D 0.000578 0 B.1 0 039 Friction factor, f 0.0175 0.5 B.2 0.5 140 Pipe pressure drop, P LOSS kg/cm2 1.26 1 B.3 1 141 Orifice pres.drop, P ORI kg/cm2 0.74 042 PORI / Po 0.046 0 B.5 0 043 Trial diameter ratio, note 1) 0.615 0 B.6 0 044 Y, fig. 9 or note 2) 0.984 0 B.7 0 0

45 V1, (V/ 2) m/s 46.20 0 B.8 0 046 Required C, eq. (20) 0.660 0 B.9 0 0

47 0 Other 0 048 Total flow resistance, K

49 Note : 1). Trial until value of C conform with C curve

50 of orifice in figure 6 or 8.

51 2). Y of flange taps orifice also can be calculated by :

49 Y = 1- ( 0.41+0.35 ).( P/Po)/ k

706

1.5

RESTRICTION ORIFICE DESIGNFOR GAS

(mm)0.0015 - 0.0025

0.0250.045

3

0.150.25

0.025/0.251




1 Gas data Valve & fittings2 Gas name NH3 Item code no. (L/D)i EQ Qty.


4 Pressure kg/cm2A 16 0 A.1.B 450 05 Design P kg/cm2 2 0 A.1.C 175 0

6 Temperature C 40 0 A.1.D 145 0

7 K 313.16 0 A.2.A 145 0

8 Viscosity cP 0.015 0 A.2.B 200 0

9 MW 17.03 26 A.3.A 13 2

10 k 1.31 0 A.3.B 260 0

11 Pcr kg/cm2A 112.8 0 A.3.C 900 0

12 Tcr K 406.1 0 A.4.A 135 0

13 Pred 0.142 0 A.4.B 50 0

14 Tred 0.771 0 A.4.C 340 0

15 Z, from chart 0.86 0 A.4.D 145 0

16 R 0.49 0 A.4.E 150 0

17 Density kg/m3 11.94 0 A.5.A 420 0

18 0.9 a = 0.9 (1000.k.T.Z.R) 0.5m/s 373.5 0 A.5.B 75 0

19 Pipe data 0 A.6 40 020 Inside pipe diameter, D mm 77.92 0 A.7.A 18 021 Pipe length, L m 65 0 A.7.B 44 022 Inside surface roughness, mm 0.045 0 A.7.C 140 023 Material surface roughness data 220 A.8.A 20 1124 Material 0 A.8.B 30 025 Drawn tube, glass, plastic 0 A.8.C 16 026 Forged, structural steel 120 A.9.A 20 627 Commercial s teel 0 A.9.B 60 028 Galvanized iron 0 A.10.A 50 029 Cast iron 0 A.10.B 26 0

30 Concrete new smooth/coarse 0 A.11.A 15 031 Water mains, old 0 A.11.B 58 032 Sewer, ol d 0 A.12 50 033 0 Other 0 034 Pressure drop calculation Total (L/D) EQ

35 Pipe (L/D) 834.1936 Gas velocity in pipe, V m/s 5.824 Other restriction component37 Reynold no. in pipe, Re 3.61E+08 Item code no. Ki Qty.38 Relative roughness, /D 0.000578 0 B.1 0 039 Friction factor, f 0.0175 0.5 B.2 0.5 140 Pipe pressure drop, P LOSS kg/cm2 0.06 1 B.3 1 141 Orifice pres.drop, P ORI kg/cm2 1.94 042 PORI / Po 0.121 0 B.5 0 0

43 Trial diameter ratio, 0.24 0 B.6 0 044 Y, fig. 9 0.962 0 B.7 0 0

45 V1, (V/ 2) m/s 101.12 0 B.8 0 046 Required C, eq. (20) 0.589 0 B.9 0 0

47 0 Other 0 048 Total flow resistance, K

49 Note : Trial until value of C conform with C curve of

50 orifice in figure 6 or 8.

51

49

1.5

0.150.25

0.025/0.2513

706

RESTRICTION ORIFICE DESIGNFOR GAS

(mm)0.0015 - 0.0025

0.0250.045

calc p drop gas1

Documents