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1. A process control valve with an equal percentage plug is used to control an actuator...
A precision flow adjustment valve (needle valve) is used to control the flow of steam in...
A precision flow adjustment valve (needle valve) is used to control the flow of steam in a ½ inch diameter (0.0127 m) pipe that is 60 m long. The pressure drop across the pipe is 16.71 kPa when the valve is half closed. Determine the loss coefficient, KL , of the valve. The average volumetric flow rate through the pipe is 0.00206 m3/s. (Steam at 200 kPa and 300 C, 0.086*10-3 Pa*s)
57. A common application of control systems is in regulating the temperature of a chemical process...
57. A common application of control systems is in regulating the temperature of a chemical process (Figure P6.13). The flow of a chemical reactant to a process is controlled by an actuator and valve. The reactant causes the temperature in the vat to change. This temperature is sensed and com- pared to a desired set-point temperature in a closed loop, where the flow of reactant is adjusted to yield the desired temperature. In Chapter 9, we will learn how a...
1. When the directional control valve in the system below returns to its centre position, the...
1. When the directional control valve in the system below returns to its centre position, the cylinder rod moves in a given direction. Is this direction extension or retraction? During this movement determine the force and velocity. The piston and rod diameters are 3-in and 1-in respectively. The pump flow rate is 2-gpm and the system pressure is 1000psi. REIXA
The valve shown is the type used in the control of water in large conduits. Model tests are to be done, using 20oC water as the fluid in both the model and the prototype, to determine how the valve wi...
The valve shown is the type used in the control of water in
large conduits. Model tests are to be done, using 20oC water as the
fluid in both the model and the prototype, to determine how the
valve will operate under wide-open conditions. The prototype size
is 2 m in diameter at the inlet and the model inlet diameter is 0.5
m. What flow rate is required for the model if the prototype flow
rate is 15 m3 /s?...
The Figure below (Figure 3) shows a pipe system with a valve and two reservoirs
QUESTION3 The Figure below (Figure 3) shows a pipe system with a valve and two reservoirs. A pump transports a constant flow rate of Q = 0.1 m3/s of water from reservoir A to reservoir B. At four sections the pipe has bends and the roughness of the pipe is ks = 1.5 mm. The pipe has a diameter D = 34 cm and a total length L = 500 m. The water level in reservoir B is Δh=4.67 m above...
i would appriciate your help. thanks Question 4-(20 marks) (a) Briefly describe the characteristics of an operationa...
i would appriciate your help. thanks
Question 4-(20 marks) (a) Briefly describe the characteristics of an operational amplifier (op-amp) and describe two examples of where It can be used in signal conditioning circults (b) (4 marks) The level of liquid In a vertical cylindrical tank is controlled by a two-position level controller. The following data was recorded for the tank and flow system over a period of stable operation tank diameter. inlet flow rate (inlet valve open5 /min inlet flow...
Question 2 A complete mix activated sludge process is to be used for biological treatment. Assume...
Question 2 A complete mix activated sludge process is to be used for biological treatment. Assume the following for the activated sludge process: • Plant influent BODs of 156 mg/L • Sludge age is 8 days Biomass yield (Y) of 0.54 kg biomass / kg BOD • Endogenous decay rate (kd) = 0.05 day! • Ks=10 g BOD/m3 Biomass concentration (X) of 2700 mg/L • recycle biomass concentration (Xr) of 12,000 mg/L The fresh flow rate treated is 1000 m²/day...
A gas absorption process is used to purify sour natural gas before being sold to user....
A gas absorption process is used to purify sour natural gas before being sold to user. In the current process, sour natural gas stream, G1, containing 15 mole% of carbon diaoxide (CO2) and the remaining methane (CH4) is fed to the bottom of the absorption column and leaves the top column as stream G2. The stream G1 is in contact with fresh amine solvent, stream L1, which is fed from the top of the column. The stream, L2, in which...
Q6. marks) Consider an electromagnetic flowmeter which is used to measure the average volumetric flow rate of a pro...
Q6. marks) Consider an electromagnetic flowmeter which is used to measure the average volumetric flow rate of a process fluid in pipe of 0.1 m diameter. The velocity profile is symmetrical and can be assumed uniform. The flux density in the liquid is 1.4 Wb/m2. The output from the fow meter is given to an amplifier of gain 10 and the internal resistance developed due to the fluid between the electrodes is found to be is 200 kf2. The input...
(b) A Newtonian liquid of viscosity 0.1 N s m2 is flowing through a pipe of...
(b) A Newtonian liquid of viscosity 0.1 N s m2 is flowing through a pipe of 25 mm diameter and 20 m in length, and the pressure drop is 105 Nm2. As a result of a process change a small quantity of polymer is added to the liquid and this causes the liquid to exhibit non-Newtonian characteristics; its rheology is described adequately by the power-law model and the flow index is 0.33. The apparent viscosity of the modified fluid is...
57. A common application of control systems is in regulating the temperature of a chemical process (Figure P6.13). The flow of a chemical reactant to a process is controlled by an actuator and valve. The reactant causes the temperature in the vat to change. This temperature is sensed and com- pared to a desired set-point temperature in a closed loop, where the flow of reactant is adjusted to yield the desired temperature. In Chapter 9, we will learn how a...
1. When the directional control valve in the system below returns to its centre position, the cylinder rod moves in a given direction. Is this direction extension or retraction? During this movement determine the force and velocity. The piston and rod diameters are 3-in and 1-in respectively. The pump flow rate is 2-gpm and the system pressure is 1000psi. REIXA
The valve shown is the type used in the control of water in
large conduits. Model tests are to be done, using 20oC water as the
fluid in both the model and the prototype, to determine how the
valve will operate under wide-open conditions. The prototype size
is 2 m in diameter at the inlet and the model inlet diameter is 0.5
m. What flow rate is required for the model if the prototype flow
rate is 15 m3 /s?...
i would appriciate your help. thanks
Question 4-(20 marks) (a) Briefly describe the characteristics of an operational amplifier (op-amp) and describe two examples of where It can be used in signal conditioning circults (b) (4 marks) The level of liquid In a vertical cylindrical tank is controlled by a two-position level controller. The following data was recorded for the tank and flow system over a period of stable operation tank diameter. inlet flow rate (inlet valve open5 /min inlet flow...
Question 2 A complete mix activated sludge process is to be used for biological treatment. Assume the following for the activated sludge process: • Plant influent BODs of 156 mg/L • Sludge age is 8 days Biomass yield (Y) of 0.54 kg biomass / kg BOD • Endogenous decay rate (kd) = 0.05 day! • Ks=10 g BOD/m3 Biomass concentration (X) of 2700 mg/L • recycle biomass concentration (Xr) of 12,000 mg/L The fresh flow rate treated is 1000 m²/day...
Q6. marks) Consider an electromagnetic flowmeter which is used to measure the average volumetric flow rate of a process fluid in pipe of 0.1 m diameter. The velocity profile is symmetrical and can be assumed uniform. The flux density in the liquid is 1.4 Wb/m2. The output from the fow meter is given to an amplifier of gain 10 and the internal resistance developed due to the fluid between the electrodes is found to be is 200 kf2. The input...
(b) A Newtonian liquid of viscosity 0.1 N s m2 is flowing through a pipe of 25 mm diameter and 20 m in length, and the pressure drop is 105 Nm2. As a result of a process change a small quantity of polymer is added to the liquid and this causes the liquid to exhibit non-Newtonian characteristics; its rheology is described adequately by the power-law model and the flow index is 0.33. The apparent viscosity of the modified fluid is...
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