The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is expected to be negligible, select the suitable material to be used for this purpose. Assume frictional pressure drop of 5 psi across the heat exchanger.
To select the suitable material for the purpose of delivering water into a boiler, we need to consider factors such as temperature, pressure, and corrosion resistance.
In this case, the water is being delivered at a temperature of 70 °F and a pressure of 35 psig. Since corrosion is expected to be negligible, we can focus on other factors.
First, let's identify the potential materials that could be suitable for this application:
1. Stainless Steel: Stainless steel is known for its corrosion resistance, making it a suitable choice for water delivery systems. However, the selection of the specific grade of stainless steel will depend on the temperature and pressure conditions.
2. Copper: Copper is another material that is commonly used for water delivery systems. It has excellent thermal conductivity and is also corrosion resistant to water. However, it may not be suitable for higher temperatures or higher pressures.
3. PVC (Polyvinyl Chloride): PVC is a common material used for piping systems due to its affordability and corrosion resistance. It is suitable for water delivery at lower temperatures and pressures. However, it may not be suitable for higher temperatures or higher pressures.
To make a final material selection, we need to consider the given conditions. The water temperature is at 70 °F, which is relatively low. The pressure is at 35 psig, which is also not extremely high.
Based on these conditions and considering the cost-effective option, PVC (Polyvinyl Chloride) can be a suitable material for this purpose. PVC pipes can handle the given temperature and pressure conditions and provide sufficient corrosion resistance in this particular case.
Please note that the final material selection should be made in consultation with an engineer or relevant experts, taking into account specific system requirements and local regulations.