1. Peruse the Water Reticulation Code of Australia and carry out the activities as indicated below:
Draw up a table entitled ‘Pipe Materials'. For ductile iron, steel, Glass-Reinforced Plastic -GRP, polyethylene and PVC pipe systems, list details of the following :
- Lining/coating
- Diameter range
- Two types of joints
- Max. working pressure (i.e. for smallest diameter)
- One major constraint on use.
2. The pump in the Figure 1 pumps water 18m up into the tank. What type of valve should be installed to prevent return of the flow in the line automatically if the pump is shut off?
3. Sketch and explain the use of a gate valve and a needle valve.
4. Provide a sketch depicting a schedule 80 and schedule 180 carbon steel pipe.
5. It has been established that as you go to higher altitudes (within the troposphere) the density of air decreases, explain why does this occur.
6. Explain the variation of the density of air in the stratosphere
7. Consider a gas recipient filled with gas at atmospheric pressure. Explain the variation of density with temperature.
8. A hot water pump pumps water from a tank (known as the condensate) up to a storage tank. The temperature and pressure on the suction side of the pump (low pressure side-i.e. entrance side of the pump) are 150o F and 27KPa. Are these conditions safe to prevent boiling of the water? Why is it that efforts are to be made to prevent boiling of the water?
9. a-In the system depicted in Fig.1 where would you place a strainer, and a filter. b-Depict it on the figure. c- Explain the difference between the strainer and a filter.
10. Consider a cylinder with the top end open to the atmosphere. The top end is fitted with a piston, which is inserted in the cylinder as per the figure 2. The piston weight is 88N. Assume there is no leakage of air, nor heat added to the system, and determine how far down will the piston drop? The area of the cylinder is 1.2 x 10-3 m2
