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Control valve sizing
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Calculation Summary Document ID
705 - XXX - XXX
SF-EG301-002E
Client Reference #
Page
Prepared By: ANISH CHANDRAN
1
of
2
Date: 3-Feb-11
(Print & Sign)
Reviewed By:
Date:
(Print & Sign)
Approved By:
Date:
(Print & Sign) Note: Approval sign off requirement determined by Project Engineer and/or Project Manager.
Calculation Title:
Summary:
VALVE SIZING CALCULATION (For Estimation)
For WATER with inlet pressure of 314.7 psia and outlet pressure of 289.7 psia, and pipe line size of 8 inch, selected a valve of nominal diameter 4 inch. The valve has a CV value of 124 and a percentage opening of 70 degrees. NO CHOCKING PHENOMENON observed.
SF-EG301-002E Calculation Summary EXCEL
Jan 2011
Calculation Summary Document ID
705 - XXX - XXX
SF-EG301-002E
Client Reference #
Page
PURPOSE:
METHOD OF ANALYSIS:
COMPUTER CODE USED:
NOMENCLATURE:
REQUIREMENTS/COMMENTS:
DATA:
ASSUMPTIONS:
LEVEL OF ACCURACY:
SKETCH:
ANALYSIS:
RESULTS:
CONCLUSIONS/RECOMMENDATIONS:
APPENDIX:
SF-EG301-002E Calculation Summary EXCEL
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of
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CONTROL VALVE SIZING (for estimation)
EXCEL SHEET
NA
NA
NA
NA FOR A SINGLE PHASE FLOW (BASED ON FISCHER CONTROL VALVE HANDBOOK) FOR ESTIMATION PURPOSE
PURPOSE : To SIZE AND SELECT VALVES FOR SINGLE PHASE FLOW
REQUIREMENTS :
To SIZE VALVES FOR VALVE SIZE EQUAL TO OR GREATERT THAN LINE SIZE & WITH SINGLE PHASE FLOW
DATA : Media Valve size Pipe size Inlet Pressure
WATER 4 8
d D P1
inch inch psia
Outlet Pressure Discharge Minimum flow discharge
P2
psia
289.7
Q min
gpm
200
Operating flow discharge
Q operating gpm
650
Design flow discharge Temperature Specific Gravity of fluid
Q design
gpm °F
800
T Gf
314.7
70 0.5
Absolute Vapour pressure of fluid
(at inlet temperature)
Pv
psia
124.3
Absolute Critical pressure of fluid
(at inlet temperature)
Pc
psia
616.3
Recovery factor
(from page 5 - 195 of catalogue)
FL
0.82
Cv
224
CV of the proposed valve at 100% opening (from page 5 - 195 of catalogue) NOTE
Catalogue refers to FISCHER - ROSEMOUNT catalogue for easy - e valves Valve model selected is ED ; EQUAL PERCENTAGE (Ref Page : 5- 186) Valve has diameter of DN 100 (4"), Class #300, with shut off class II. Used for general process application with balanced trim and can withstand a temperature of upto 420° C (800 F)
PERCENTAGE VALVE OPENING CALCULATOR Take values from manufacturer's catalogue (enter here)
Calculated CV value
124
CV value just preceeding calculated CV value
18.3
% valve opening corrosponding to that value
30
CV value just succeeding calculated CV value
125
% valve opening corrosponding to that value
70
Percentage Valve opening corrosponding to calculated CV SELECTED % OPENING
69.6251 70
CROSS CHECKING VALVE SELECTION USING GAIN ACROSS APPLICABLE FLOW RATES (Enter the calculated % stroke for each case using the calculator sheet ) Flow Type
