1. A cast iron pipe is to carry 60 m³ of compressed air per minute at a pressure of 1 N/mm². The velocity of air in the pipe is limited to 10 m/s and the permissible tensile stress for the material of the pipe is 14 MPa. Find the diameter of the pipe and its wall thickness. 2. A tank has volume of 5m³ and contains water at 20°C. Assuming a density of 990 kg/m³, calculate the weight of water in the tank. What is the specific weight in N/m³ using a value of 9.81 m/s² for gravitational acceleration? → Given that, Specific weight (N/m³)= weight volume 3. Valve actuators are devices used to position valves. They can be used to fully open and shut a valve, or in an application that requires constant and precise control, such as regulating the flow of fuel to a gas turbine, modulate the position of the valve. Give differences between pneumatic, electrical and hydraulic valves actuators. 4. Explosion vents are openings through which explosion gases are vented. They are typically used for venting deflagrations in atmospheric storage tanks and large enclosures. A single pipe flow a high pressure fuel at UTHM Biodiesel plant has internal surface area for 20 ft² and maximum design pressure of 600 psi. Calculate the vent area of the piping when the venting equation constant is 1.5. ,Given ܀ A₁ = CAS Pred A₁ = vent area, ft² C=venting equation constant (0.05 to 0.02 depending on fuel) As internal surface area of enclosure, ft² Pred maximum design pressure of enclosure, psi