Question 1:
Design a pumping system that will transfer raw water from Reservoir A to Reservoirs B and C. A control valve shall be located in Line D-C next to Reservoir C to control the share of flow between Reservoir B and C.
The pump station shall contain a main suction isolation valve and at least three pumps. It shall be located some 200 m downstream of Reservoir A. The pumps shall be arranged and valves be provided and duty/standby pumps be selected as per "good design practice".
System operating modes:
MODE (I)
(Design condition)
- Normal flow rate from reservoir A to be 250 litres/second
- Discharge into Reservoir B to be 50 litres/s and into
Reservoir C to be 200 litres/s.
MODE (II)
(All flow to Reservoir C)
- The same number of pumps running as in MODE (I)
- Control valve in Line D-C set to cause all flow running into
Reservoir C, i.e. no water to be discharged into or drained from Reservoir B.
Tasks:
1. Draw a detailed system schematic for MODE (I), allowing for sufficient valves (no non-return valves in Line D-B) and at least three 90 degree bends per pipe section.
2. Show the selected pipeline diameters and their associated head losses (based on good engineering practice) in a table and justify the reasons for your component selection.
3. Show the expected pump operating points for MODE (I) and demonstrate these by showing pump performance and system resistance curves.
4. Determine the amount of the main suction isolation valve to be throttled in MODE
(I) in order to match an NPSH safety factor of 1.15 for the pumps.
5. Show pump operating points, system resistance curves and control valve settings for operation in MODE (II).
Question 2
From the information given below, calculate the total life cycle cost for each pipeline diameter and determine the optimum pipeline diameter.
Pipeline system parameters:
System flow rate, Q = 1000 l/s
Pipeline static lift, Hs = 500 m
Pipeline length, Lp= 80 km
Pipe friction factor, f = 0.02
System design life 30 years, NPV factor = 7.50
Cost of pumping power = $0.05/kWh
Hours of operation = 24 hours/day, 365 days/year
Pump set efficiency = 85%
Pipeline maintenance cost = $20,000 pa
Cost per pump station = $ 5,000,000
Number of pump stations = 2
Pipe diameter and costs
Pipe internal diameter Pipe supply and install cost
700 mm $600/m
800 mm $650/m
900 mm $700/m
1000 mm $750/m
In the calculation, you may wish to ignore losses in valves, fittings, inlet and outlet.
QUESTION 3:
Write a factsheet or a short essay/report of literature review on the current research and development in pumping technology. You may choose to focus on one of the following topics (other topics should be pre-approved by the course examiner):
- Strategies for energy efficiency of pumping systems
- Application and importance of pumping systems
You may need to cover:
- Introduction - importance of the issue
- Technology currently being investigated (the working principle, pros and cons)
- Future research
- Summary
You may base your essay on the materials assigned for this module and also any other information available on the internet and in the library. Concise and clear to the point presentation style are strongly encouraged. The report should be well structured with appropriate uses of headings (as suggested above) and sub-headings. The key points should be clearly emphasized and the extensive uses of bullet points (dot points) or tables are encouraged.
Marks will be allocated according to the following three criteria:
- General presentation and layout, grammar, spelling, referencing, logic of the presentation.
- Accuracy/appropriateness of factual materials
- Discussion/interpretation of materials
Length: A standard essay format of 2-4 A4 pages (including 3-5 references) would be appropriate.