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(ºf + 460) p2 = downstream (outlet) pressure in psia psia = absolute pressure. Dimensional flow coefficient (cv and kv) calculation. The determination of the cv of gas is carried out in accordance with international standards and the gas (calculation of thermal energy) regulations, as amended in 1997. G = specific gravity (air=1.0) t = flowing temperature absolute (ºf + 460) q = 34.3 cv p g the rate of flow of a liquid or gas through a valve depends upon numerous factors such as Qg = gas flow rate in standard cubic feet per hour (scfh) p1 = upstream (inlet) pressure in psia (absolute pressure) p2 = downstream (outlet) pressure in psia (absolute pressure) psia = absolute pressure.
Cv Calculation For Gas Metric. To convert mass flow to volume, use the following equation: = mass flow in lbs/min r = universal gas flow constant (1545 ft lbf/(lb mol)(°r)) divided by m.w. Qg = gas flow in standard cubic feet per hour p1 = upstream (inlet) pressure in psia t = absolute temperature in ºr. The assumptions are such that cv is 38.76mj/m3, with a mj to kw conversion of 3.6.
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X t 816 x p g 1 cv = q 962 (s.g. Calculation of pressure loss using the c v method a c v value is defined as the rate of flow of water in us gallons per minute at 60°f at a pressure drop of 1 psi across the equipment. This is psig (gauge pressure) plus 14.7 (atmospheric pressure) G = specific gravity (air=1.0) t = flowing temperature absolute (ºf + 460) q = 34.3 cv p g the rate of flow of a liquid or gas through a valve depends upon numerous factors such as The flow of water through a valve at 60°f in us gallons/minute (gpm) at a pressure drop of 1lb/in². You can use 40.0 as a default number if you don’t have the exact figure.
The relationship between c p and c v for an ideal gas.
With an imperial meter the part units are. Cv is the flow coefficient in imperial units. In the following section, we will find how c p and c v are related, for an ideal gas. Following is a complete gas rating chart for metric meters. This is our valve c v calculator. C v & flow calculator.
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To convert mass flow to volume, use the following equation: Flow coefficient is an imperial measurement and is defined as: Flow coefficient, cv, and flow factor, kv, are values used to specify the hydraulic capacity of a control valve. Q p = n c p ∆t. The c v values, using us customary units are far more widely reported than k v values, using metric units.
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Convert from cubic feet to kilowatt hours (multiply by 31.6586). It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º. Cv =200 √1.8/5 = 200 √.36 = (200)(0.6) = 120 from cv table: From cv table, the corresponding valve position is 70% open. M3/hr x 35.3 = ft3/hr
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Units by dividing it by 54.9. It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º. The c v values, using us customary units are far more widely reported than k v values, using metric units. (metric units) the flow coefficient k. To convert mass flow to volume, use the following equation:
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Is the standard flow rate which. Converting from ft3/hr to m3/hr: Specific gravity (1 for water) v: The assumptions are such that cv is 38.76mj/m3, with a mj to kw conversion of 3.6. In effect this means that the fluid data for the fluid zone associated with the control valve must be defined for the approximate pressure condition at the outlet.
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With a metric meter the part units of gas are highlighted in red and those digits are often separated by (i.e. Subtract the new meter reading from the previous reading to work out the volume of gas used. Cv = (25 gpm) (1 / (1 psi))1/2. In effect this means that the fluid data for the fluid zone associated with the control valve must be defined for the approximate pressure condition at the outlet. The flow of water through a valve at 60°f in us gallons/minute (gpm) at a pressure drop of 1lb/in².
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Qg = gas flow rate in standard cubic feet per hour (scfh) p1 = upstream (inlet) pressure in psia (absolute pressure) p2 = downstream (outlet) pressure in psia (absolute pressure) psia = absolute pressure. C v & flow calculator. To the right hand side of) a decimal point. The cv of the gas at each local distribution zone is continually measured by the national grid who sends this figure to your gas supplier, who then uses it for their calculations. Cv is the flow coefficient in imperial units.
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3.2 flow coefficient cv (imperial units). From cv table, the corresponding valve position is 70% open. Qg = gas flow in standard cubic feet per hour p1 = upstream (inlet) pressure in psia t = absolute temperature in ºr. When p2 is less than 1/2 p1, use 1/3 p1, for p2 in formula. Please contact us if the fluid specification requires viscosity correction.
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To correctly model the pressure drop for the entered cv or kv value the density of the gas used in the calculation must be the density of the gas at the outlet of the valve/component. This value is equal to the change in enthalpy, that is, q p = n c p ∆t = ∆h. Units by dividing it by 54.9. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. K = q / sqrt
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C v calculator for valve sizing. Calculation of pressure loss using the c v method a c v value is defined as the rate of flow of water in us gallons per minute at 60°f at a pressure drop of 1 psi across the equipment. Qg = gas flow in standard cubic feet per hour p1 = upstream (inlet) pressure in psia t = absolute temperature in ºr. The flow of water through a valve at 60°f in us gallons/minute (gpm) at a pressure drop of 1lb/in². Converting from m3/hr to ft3/hr:
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To correctly model the pressure drop for the entered cv or kv value the density of the gas used in the calculation must be the density of the gas at the outlet of the valve/component. Is the standard flow rate which. Converting from ft3/hr to m3/hr: The cv of the gas at each local distribution zone is continually measured by the national grid who sends this figure to your gas supplier, who then uses it for their calculations. ※2 calculation of viscosity correction is necessary when the fluid is liquid and the kinematic viscosity is 20 mpa・s or more and the calculated cv value is 0.01 or less.
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From cv table, the corresponding valve position is 70% open. C v calculator for valve sizing. Head drop (high of fluid) δp: Converting from ft3/hr to m3/hr: The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:
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