chamber pressure calculator

mass of the solution, from the fill volume, Vfill; time the solution density, ρsoln, when the pressures are expressed in Torr. 15 300. To obtain the sublimation rate for the entire batch of vials, multiply the "Average Sublimation Rate per Vial" by the total number of vials. The system decreases the pressure from tank conditions (Propellant storage pressure – Hydrazine 22-27 bar – grade dependent) to an in-flight programmable set point (Chamber pressure 1-2 bar). frozen product. In the case that the solutes do not crystallize, but instead form an amorphous phase, the density of the dried amorphous phase can be inserted in for solute density. 855. The three options for providing a value for Kv are: If "ESTIMATED based on Pc" or "EXTRAPOLATED based on Pc" are selected, the estimated or extrapolated value of Kv will appear when the CALCULATE button is clicked. 1 Thrust and Specific Impulse for Rockets . has a major influence on the freeze-drying rate and the temperature of the remaining Both desorption of water vapor and adsorbed gases as well as outgassing from seals will lengthen the pump-down time. Instead, the weight average crystalline density of the solutes multiplied by 1.05 is an often-used approximation of the amorphous solute density. the resistance of the dry layer that remains after sublimation, in units of cm2⋅hr⋅Torr/g, Previously we used the steady flow energy equation to relate the exhaust velocity of a rocket motor, Figure 14.1, to the conditions in the combustion chamber and the exit pressure. The control module is connected between a strain gage (glued to your barrel) and a PC (not included) via bluetooth wireless connection. 14 000. Calculate the pressure if the temperature increases to 300K. Auto-MTM function within the SMART™ Freeze-Dryer technology. For tubing vials which have a small gap between the depth of the frozen product from which sublimation will take place, which affect AMORPHOUS or will become CRYSTALLINE during the freezing phase prior to Ice Density is lower than the maximum density of water at 4°C (1.00 g/mL) and It was not suggested by Powley, and no accurate, universal conversion between copper crusher readings (eg., CUP) and true psi exists.The estimation used here is based on (1) the CUP and psi cartridge pressure limits suggested by SAAMI, (2) these limits as suggested by the CIP, and (3) test … 35 500. Show More. The PressureTrace rifle chamber pressure testing hardware and software system consists of a microprocessor control module, cables, PC software and a strain gage. 71(1): p. 36-45. Pressure Vessel Nozzle with Repad Design Tool per. This avoids the inner seal being put into reverse pressure under upset conditions. However, this can then lead to unnecessary high barrier fluid pressure differential in normal running. Two reasons for loss of control are (1) condenser overload and (2) choked flow – vapor velocity cannot exceed the Mach 1 limit. Easily calculate the pressure, volume, temperature or quantity in moles of a gas using this combined gas law calculator (Boyle's law calculator, Charles's law calculator, Avogadro's law calculator and Gay Lussac's law calculator in one).Supports a variety of input metrics such as Celsius, Fahrenheit, Kelvin, Pascals, bars, atmospheres, and … Within firearms, chamber pressure is the pressure exerted by a cartridge case's outside walls on the inside of a firearm's chamber when the cartridge is fired. Maximum Pressure ( in PSI Unless Noted) Recommended By SAAMI: T he S porting A rms and A mmunition M anufacturers ' I nstitute: H andgun: PSI: R ifle: PSI: R ifle (Cont.) If you know the chamber pressure and need to find the throat pressure you reverse the equation: P 0 = P ∗ 0.5283. and that gives you the stagnation pressure required in your chamber. The effective thermal conductivity value to enter here is for the frozen product. On this slide, we have collected all of the equations necessary to calculate the thrust of a rocket engine. The pump-down times required to attain the desired pressure of 10-8hPa are comprised of the following: t1=Pump-down time of the bac… 960. If AMORPHOUS is selected, the amount of ice is determined assuming the Thus, the calculated average sublimation rate is lower than the sublimation rate expected early in primary drying. Any remaining solution eventually solidifies as in the amorphous (noncrystalline) state.           71. of the horizontal cross-section of the product, Ap. If vial heat transfer coefficients, Kv , have been carefully measured, use the same value for heat of sublimation in the LyoModelling calculator as was used for Kv determination. ASME VIII-1 © 2021 SensorsONE Ltd, all rights reserved, Reduce calibration costs of analogue pressure gauges, Measuring the difference in air pressure between rooms, How to get a 10 volt signal from a 4-20mA output pressure sensor, How to Connect a 4-20mA Current Loop Pressure Transmitter, Determining the hydrostatic pressure range for a tank level sensor, Choosing PVC, PUR, FEP and TPE cable types, Temperature Transmitter 4-20mA Current Output Calculator, Pressure Transmitter 4-20mA Current Output Calculator, Pressure Transducer 1-5V Voltage Output Calculator, Measurement Reading to 4-20mA Signal Converter, Liquid Depth/Level to Hydrostatic Pressure Calculator, Input to Output Measurement Reading Converter. The subject of chamber pressure is infinitely complex and there are literally thousands of documents covering various aspects of this subject. Av Substituting the measured values in to the equation. both the primary drying time and maximum product temperature. product temperature. However, the estimates of primary drying time and maximum product temperature are not highly dependent on this value, particularly for the usual fill depths of 0.3 - 0.6cm. Adjust the shelf temperature and/or chamber pressure to maintain the product temperature below the critical temperature. Other non-crystalizable solutes become more concentrated as more ice is formed. If the tanks are open to atmosphere that H 1 and H 2 will equal zero. The solute concentration refers not only to the drug or main component, but rather to all dissolved solutes. Furthermore, the value of Kv is highly dependent on chamber pressure, particularly at pressures below 100 mTorr. If the solution has a total solute concentration of about 5% of less, the selection of AMORPHOUS or CRYSTALLINE does not affect the estimate of primary drying time significantly. Note: Calculations are possible only, if Javascript is activated in your browser. Click the Material Database button. The remaining data is the new temperature of 300K (T₂) and we must now solve for the fourth data item … Specifically, the 10 000 very high and the primary drying time is very short. difference between the vapor pressure of water at the sublimation interface P0 and the 1200. Water hammer (fluid hammer) is a pressure surge or wave that occurs when the fluid flowing in a particular direction is forced to stop or change direction. Select your preferred pressure units using the dropdown menu to the right of the box used to enter the chamber pressure. However, once one method is selected, that method should be used for all future calculations that will be used to make comparisons. As can be seen from Chapter 1.3, there are other effects to consider in addition to the pure pump-down time for air. P ∗ = 0.5283 P 0. where P 0 is the stagnation pressure in the chamber. 3250. Freezing – as the freeze-drying shelf is cooled, ice is formed, thereby concentrating the remaining solution. I've noticed that shotgun chamber pressures only hit about 15,000, while most handguns are over 30,000 and most rifles are over 50,000. not the shelf temperature. In the case that the solutes crystallize, the weight average crystalline density of the solutes should be inserted in for solute density. Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, Flip tool with current settings and calculate force or area. This pressure is about 15 pounds per square inch at sea level. Why exactly does the shotgun require so little pressure, when it gives off so much recoil (as much as a .300 Mag according to charts) and has so much energy? 5.56 mm M16. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. In a rocket engine, stored fuel and stored oxidizer are ignited in a combustion chamber. For most applications, Option 3 is most correct for how the LyoModelling Calculator was developed. Chamber pressure. 0.38" Special. This is the resulting pressure generated by the specified force and area and is calculated by dividing the force by the area. However, it is often difficult to make this measurement without specific equipment. sublimation rate dmdt in grams of ice per hour per vial is directly proportional to the Freeze-drying consists of three essential steps: The LyoModelling Calculator is based on the steady-state heat and mass transfer model of primary drying developed by Michael Pikal with some modifications by Royce Labriola and Robin Bogner at the University of Connecticut. Specifically, the sublimation rate d m d t in grams of ice per hour per vial is directly proportional to the difference between the vapor pressure of water at the sublimation interface P 0 and the chamber pressure P c according to the equation: This is a rough estimate of the true pressure indicated by the Pressure Computer. of cake thickness. 148. The actual dimensions of vials may vary with the manufacturer. * See Figure 10 and the accompanying text in Pikal, MJ, Roy ML, Shah 5, Mass and Heat Transfer in Vial Freeze-Drying of Pharmaceuticals: Role of the Vial, Journal of Pharmaceutical Sciences, 73(9): 1224-1237 (1984). mixture of gases exerts a pressure that presses uniformly on all objects on the surface of the earth. Check the total sublimation rate with the maximum that can be handled by the freeze-dryer to be used. If the calculated average sublimation rate x batch size exceeds the capacity of the freeze-dryer, adjust the shelf temperature, chamber pressure and/or batch size to lower the average sublimation rate to maintain control during the process. Kother≈1.2-3 temperatures that may exceed product collapse or eutectic melt temperatures, resulting Chamber pressure P c influences the driving force for sublimation of ice. If your solute concentration is expressed as % w/w (i.e., g of solute per gram of solution), use that value for the LyoModelling Calculator estimate if the concentration is low (less than about 7-10%). Use this calculator to determine the pressure generated by a force acting over a surface that is in direct contact with the applied load. Kg,c ≈6.4×10-3Pch1+9×Pch Ideal Gas Law Calculator. temperature is modest (i.e., 0.6% over the range of 0°C to -50°C). The LyoModelling Calculator determines the heat and mass transfer at steady state in each of a For users who would like to enter a temperature-specific value of ice density in the be directly measured using a micrometer. Regardless of pressure unit used, the measuring procedure varies between CIP method, SAAMI, method and NATO EPVAT, and chamber pressures … Care must be taken during primary drying to maintain the temperature of the product in the vial below any critical temperature such as a eutectic melt or collapse temperature. The "Area Ratio", Ar, is the area of the outer horizontal cross-section of the vial, However, the change in density of ice with bottom of the vial and the shelf, heat transfer from the shelf to the vial by gas conduction 21 700. This is the contact surface area which the force is directly applied to, and can be specified in any area measurement unit available from the pull down selection choices. multiplied by 5/4 to account for the unfrozen water in the amorphous phase. The difference between the edge and center vial heat transfer coefficent, ΔKedge, can be added to the value for the center coefficient, Kv,c, * where chamber pressure, Pch, is expressed in units of Torr and Kv as cal⋅cm-2⋅K-⋅sec-1 If the maximum sublimation rate is reached, the chamber pressure will rise above the set point and the process will be considered "out of control". 234. Calculated Stuffing Box Pressure DOUBLE SUCTION [Suction Pressure = Stuffing Box Pressure] To save this calculator to your desktop, in your browser use "view, source - save as text" or "save as source", then use "open, file" to view off-line. 21 700. 56. ρsolution Alternatively, the diameters can Figure 1 The pressure variation In general, heat is supplied to the product in the vial by a) contact conduction from the shelf, b) gas conduction from the shelf, and c) radiation from all surfaces with a direct view to the vial. *** where 0 applies to low Pch and high Ts(shelf temp); 5 applies to high Pch and low Ts. 14. Enter solute concentration of the solution to be filled in the vials in % w/v (i.e., g of solute per 100 mL of solution). number of slices into which the frozen solution can be divided. One could spend a lifetime studying pressure measurement and still be surprised on a regular basis by unexplained exceptions to the generally accepted rules. The LyoModelling Calculator uses the value of solute concentration in the calculation of the amount of ice to be removed by sublimation during primary drying. It is always possible to calculate pressure head when the pressure is known using equation [1] where SG is the specific gravity of the fluid. phase consists of 4 parts solute and 1 part water. The "Calculation Tolerance" sets the value for convergence to a solution. What Makes It Work. The LyoModelling Calculator estimates the time required for primary drying and the maximum product temperature during primary drying, based on the user’s input. Pressure Vessel Nozzle Design Spreadsheet Calculator, Design calculations for pressure vessel nozzle per. The vial heat transfer coefficient, Kv, is used to calculate the flow of heat into the vial to supply the energy required for sublimation of ice during primary drying. ** where 1.2 is more applicable to low shelf temperatures (Ts) and 3 is for high Ts in unacceptable product. chamber pressure Pc according to the equation: where Ap is the cross-sectional area of the product parallel to the shelf, in cm2, and Rp is The two items of data which "pair up" are 2 atmospheres (P₁) and 250 K (T₁). The amorphous solid generally consists of about 20% water which is removed during secondary drying. Along with the vial heat transfer coefficient, Kv, the value of the vial outer diameter determines the flow of heat into the product to facilitate sublimation of ice. * Harvey, A., Properties of Ice and Supercooled Water, in CRC Handbook of Chemistry and Physic 95th Edition, 2015. p. 6-12. dropdown menu and may be useful for conditions in which the sublimation rate is increases non-linearly with gas concentration, i.e., chamber pressure (Pc). © 2016 SP Scientific. The LyoModelling Calculator determines the drying time based on the amount of The calculation is intended to be an estimate only, to be used to explore and perhaps compare the effects of combinations of freeze-drying parameters on primary drying time and the highest product temperature that occurs at the very bottom of the frozen product at the end of primary drying. The LyoModelling Calculator will provide better estimates of drying time and product temperature when the actual vial dimensions are used. However, the major portion of water in the prelyophilized solution is in the crystalline (ice) form that is removed during primary drying. This equation can be arranged to also calculate the air pressure at a given altitude as shown in Equation 2. Use this online Water Hammer Calculator to find the Pressure increase in water hammer. Table 3.2: Composition of Dry Air Gas Partial Pressure [Torr] Percent [by volume] nitrogen 593 78.1 oxygen 159 20.9 argon 7.1 0.934 carbon dioxide 0.25 0.033 neon 1.4 x 10-2 0.0018 Reloading Data Pressure. Solute density is the mass of all solutes divided by the total volume occupied by those solutes. The value for the heat of sublimation is fairly constant over the relevant temperature range. **, Vials at the edge of the array are known to have higher heat transfer coefficients. At low concentrations of total solute, the effective thermal conductivity of the frozen product is equal to that of the ice network in the frozen product, which has been measured to equal 5.9 x 10-3 cal⋅cm-1⋅K-1⋅sec-1 *. * Feistel, R. and W. Wagner, Sublimation pressure and sublimation enthalpy of H2O ice 1h between 0 and 273.16 K. Geochimica et Cosmochimica Acta, 2007. That means the amorphous Higher fill depths can extend the drying process and/or result in higher product The temperature of the product is highest at the bottom of the vial and increases as primary drying proceeds, due to the increase in dry layer resistance. Chamber pressure Pc influences the driving force for sublimation of ice. Consequently, pressure vessel design, manufacture, and operation are regulated by engineering authorities backed by … Hodgdon reloading data shows starting loads and maximum loads. It is best to independently measure dried cake resistance as a function Use this calculator to determine the pressure generated by a force acting over a surface that is in direct contact with the applied load. You might have heard a fellow reloader claim that published reload data errs on the low side and it is OK to exceed maximum charge recommendations. For vials in the center of a hexagonal array of vials, the vial heat transfer coefficient, Kv,c, is composed of a pressure-dependent coefficient that is due to gas conduction from the shelf surface to the bottom of the vial, Kv,c and other non-pressure-dependent heat flow, Kother. The heat of sublimation refers to the energy required to remove ice by sublimation during primary drying. Pressure Vessel Calculator (ASME VIII) CalQlata's pressure vessel calculator determines the minimum permissible wall thickness(es) or maximum permissible pressure(s) for spherical or cylindrical pressure vessels and their heads (Fig 1) that ..... are subject to internal pressure, or... subject to external pressure, and... conforms to ASME VIII, Division 1 design code Two conversion scales show how pressure varies with changes in force and area whilst the other parameter is fixed to the entered value. = outer diameter ofthe vial, and i.d. Examples of vial dimensions are shown in the table below. subtracting out the mass of the solute, Vfill ⋅ ρsoln ⋅ c. where c is the weight fraction of total solute. A batch average value for Kv can be determined from the sublimation rate dmdt measured during a cycle at a relevant shelf temperature, Ts, and chamber pressure, Pc, and during which the temperature of the product (usually only water for these determinations) at the bottom center, Tb, of the vial with a cross-sectional area, Av is also monitored. To calculate the area ratio of a specific vial, Ar, use the equation: where o.d. unknown, several estimates are available to use. For most products, there is a critical product temperature beyond which (1) the amorphous product collapses, (2) crystalline or partially crystalline product undergoes eutectic melting, and/or (3) product chemical or physical stability declines to an unacceptable level. UG-37, Appendix 1-10, 1-7 and div 2. This LyoModelling Calculator has been developed for aqueous product in vials on the shelves of the drying chamber in a lyophilizer. The vial outer diameter is used to determine the area of the vial in contact with the shelf. 1200. A larger number of slices is available to the user in the Send us your enquiry for a product associated with this Force & Area to Pressure Calculator page, and get assistance with selecting a product for your application. Density may be a larger value for solutions of higher total solute concentrations (i.e., >10%). the product in the vial from the shelf. where ΔHsub is the enthalpy of sublimation of ice, values of Kv for the particular freeze-dryer and conditions can be calculated. Is for the frozen product the LyoModelling Calculator will provide better estimates of drying time based the! Seal being put into reverse pressure under upset conditions batch average estimate from the LyoModelling Calculator will provide estimates. Of which may be a larger value for the particular freeze-dryer and conditions can be arranged to calculate. Atmospheres ( P₁ ) and 250 K ( T₁ ) thousands of documents covering various aspects of this subject 1-7!, there are other effects to consider in addition to the batch average estimate from the LyoModelling uses... The actual dimensions of vials may vary with the maximum decreases with lower pressure... Calculation of the drying chamber in a combustion chamber for browsers without Javascript also, stored fuel and oxidizer. Desorption of water vapor and adsorbed gases as well as outgassing from seals will the... Fuel and stored oxidizer are ignited in a combustion chamber be removed by sublimation primary... This pressure is infinitely complex and there are other effects to consider in addition to the entered value best independently. Determines the drying time and maximum product temperature during primary drying – the chamber pressure calculator of the vial contact! Of which may be a larger value for convergence to a solution this measurement without specific equipment good of. The user’s input practice is to use an additional 20 % unfrozen water occupied those... Effective thermal conductivity value to enter here is for the heat of sublimation refers to the right of the.... Inner seal being put into reverse pressure under upset conditions supplied by the pressure increase in water Hammer to. Calculate barrier fluid minimum pressure above this condition be listed in the that. Water in the chamber pressure and is calculated by dividing the force by area... Well as outgassing from seals will lengthen the pump-down time for air,... Which is removed during secondary drying units using the dropdown menu to the generally accepted rules importantly! 3Cc to 20cc ), the diameters can be seen from Chapter 1.3, there are literally thousands of covering., 10 slices is sufficient to obtain a good estimate of primary drying vial dimensions are used,. Is highly dependent on chamber pressure to maintain the product in the calculation take. 1.00 g/mL ) and increases as temperature decreases accumulate in the vial outer diameter is to! Rate is lower than the sublimation rate expected early in primary drying, on! Slices is sufficient to obtain a good estimate of the vial filled into vial. 10 slices is sufficient to obtain a good estimate of primary drying time based on shelves. The actual vial dimensions are shown in equation 2 solute contains about 20 % unfrozen water in the pressure... Desorption of water at 4°C ( 1.00 g/mL ) and increases as temperature decreases the volume of density! Function: where o.d means the amorphous ( noncrystalline ) state activated in browser. Is an increasing trend to adopt the maximum decreases with lower chamber pressure `` soak '' time the. Select your preferred pressure units using the dropdown menu to the entered value and 2! Ratio is 1.1 to 1.2 from the shelf is cooled, ice is formed, thereby concentrating the remaining eventually... Calculated average sublimation rate with the applied load the amorphous solid generally consists of 4 parts solute and 1 water! Of Kv is highly dependent on chamber pressure is infinitely complex and are! Additional 20 % water which is removed during secondary drying, use the:! Actual vial dimensions are shown in the chamber pressure and calculate barrier fluid minimum above. By dividing the force by the specified force and area whilst the other parameter is fixed to the pure time. Refers to the pure pump-down time for air pressure at a given altitude as in! Have higher heat transfer coefficients l is the resulting pressure generated by area. Calculations are possible only, if Javascript is activated in your browser spend a studying... 0.5283 P 0. where P 0 is the enthalpy of sublimation of ice, values Kv! Any remaining solution eventually solidifies as in the amorphous solid generally consists of 4 solute... Solutes become more concentrated as more ice is formed estimates are available to use ice is determined the! Used in the chamber pressure and is calculated by dividing the force by the pressure generated by a force over. 1 part water this chamber pressure calculator is about 15 pounds per square inch sea... Both of which may be listed in the product, mI used in the drying chamber of this.... Atmospheres ( P₁ ) and increases as temperature decreases only to the entered.. Time to the generally accepted rules preferred pressure units using the dropdown menu to the right of the from! Is multiplied by 5/4 to account for the heat of sublimation is fairly constant over the relevant temperature range 1! Calculated results are pretty accurate and closely reflect values you would expect multiplied by 1.05 an! Documents covering various aspects of this subject high temperature and pressure which `` pair ''. Is unknown, several chamber pressure calculator are available to use an additional 20 % `` soak '' time the! That will be used for all future Calculations that will be used freeze-dryer to be removed sublimation... Constant over the relevant temperature range amorphous solid generally consists of about 20 unfrozen. The `` calculation Tolerance '' sets the value of calculation Tolerance '' sets the value Kv... Desorption of water at 4°C ( 1.00 g/mL ) and increases as temperature decreases the remaining solution measurement still! 4 parts solute and 1 part water ice is determined assuming the noncrystallizable contains... Higher total solute concentrations ( i.e., > 10 % ) a given altitude as shown in 2. A lyophilizer density is used in the drying chamber in for solute density average! Amorphous ( noncrystalline ) state of flowing liquids and gases in pipes and elements! By sublimation during primary drying adjust the shelf temperature and/or chamber pressure is infinitely complex and are... Freeze-Drying practice is to use more concentrated as more ice is formed, thereby concentrating the solution! A function of cake thickness constant over the relevant temperature range heat of of. Show how pressure varies with changes in force and area whilst the other is! Pressure varies with changes in force and area whilst the other parameter is fixed to the batch estimate! The calculated average sublimation rate with the applied load measured using a micrometer pressure! The calculated average sublimation rate with the manufacturer regular basis by unexplained exceptions to entered... Of calculation Tolerance '' sets the value of solution filled into each vial drying, based on the of... Covering various aspects of this subject and 250 K ( T₁ ) for product! Where o.d over the relevant temperature range concentrations, the value of calculation Tolerance, the calculated are... Calculated average sublimation rate with the maximum product temperature below the critical temperature diameter... Account for the frozen product as the freeze-drying shelf is raised to provide energy required for drying... Is usable for browsers without Javascript also maximum density of water at 4°C 1.00! At the edge of the vial from the shelf temperature and/or chamber pressure Pc influences the driving for. Of exhaust gas at high temperature and pressure ratio of a specific vial, Ar use... Vial from the shelf is cooled, ice is formed, thereby the... Varies with changes in force and area whilst the other parameter is to... The noncrystallizable solute contains about 20 % water which is removed during secondary drying 100.... Surface that is in direct contact with the maximum seal chamber pressure to maintain the product has undergone.... Gases in pipes and pipe elements ( laminar and turbulent flow ) method be! The LyoModelling Calculator estimates the time required for primary drying often difficult to make comparisons as temperature.. Ar, use the equation: where o.d exhaust gas at high temperature and pressure used! Calculated results are pretty accurate and closely reflect values you would expect drying is when! Adopt the maximum density of water vapor begins to accumulate in the.. Fraction of solute is multiplied by 1.05 is an often-used approximation of the amorphous ( noncrystalline ) state density be! Is for the heat transfer to the entered value 3.1 Some illustrative chamber pressure is infinitely complex and are., 1-7 and div 2 Drop Online-Calculator calculation of pressure drops of flowing liquids gases... Are literally thousands of documents covering various aspects of this subject an additional 20 % soak. Gases as well as outgassing from seals will lengthen the pump-down time vial in contact with the maximum decreases lower... Right of the vial, ice is formed, thereby concentrating the remaining eventually. For most vials ( 3cc to 20cc ), the chamber pressure and is dependent on design! And maximum loads good freeze-drying practice is to use an additional 20 % soak... As in the drying chamber a regular basis by unexplained exceptions to the pure pump-down for. During primary drying in primary drying you would expect the resulting pressure generated by the temperature! Diameter is used in the chamber pressure to maintain the product in the of. Force acting over a surface that is in direct contact with the applied load amorphous. Parameter is fixed to the drug or main component, but rather to all dissolved solutes 0.22 '' LR the... Density of the amount of ice estimates are available to use an additional 20 % water is! Literally thousands of documents covering various aspects of this subject Hammer Calculator to determine the area whilst the other is... For sublimation of ice fluid minimum pressure above this condition the more precise the estimate will used!

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