Network Planning

NEWCASTLE UNIVERSITY School of Marine Science & Technology

2008 - 2009 MAR 2313

Network Planning The objective of this coursework is to practise and demonstrate understanding of the use of network planning in marine production. A network is constructed after the initial product work breakdown structure has been developed. This shows sequence and timing for the main planning units to be taken to the building dock or berth and erected in place. The network is then extended to show the main activities before erection begins. For the following example, create the network and answer the questions. A small shipyard has just received a new order. The preliminary work breakdown has identified the units and other interim products listed in the table. Using the information given construct a network for the erection of the planning units to complete the building of the ship in the dock, from first unit into the building dock to float out. S/N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Interim Product Cargo Unit 1 Cargo Unit 2 Cargo Unit 3 Cargo Unit 4 Cargo Unit 5 Cargo Unit 6 Lower fore end Upper fore end Deck cranes Lower Engine room Main Machinery Upper Engine room Aft end Superstructure Float out

Time to complete 2 days 4 days 4 days 4 days 4 days 5 days 6 days 8 days 10 days 4 days 13 days 6 days 8 days 10 days 1 day

Predecessors 1 2 3 4 5 6 7 5 1 10 11 12 12 8, 9, 13, 14

1) Which interim products are on the critical path? The following are the interim products on the critical path:S/N 1 2 3 4 5

Interim Product Cargo Unit 1 Cargo Unit 2 Cargo Unit 3 Cargo Unit 4 Cargo Unit 5

MARINE PRODUCTIONS

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NEWCASTLE UNIVERSITY School of Marine Science & Technology 6 7 8 13 15

2008 - 2009 MAR 2313

Cargo Unit 6 Lower fore end Upper fore end Aft end Float out

2) How long will the construction on the berth take? Assuming 5 days work week (Mon to Fri), Weekdays: 0800hr – 1700hr The project start date is estimated to start 20 Jan 09 and end 12 Mar 09 (37 working days). See page 5 for detailed gantt chart. 3) What is the effect if the superstructure is lifted on board after the launch? The project would have a delayed end date to 26 Mar 09 (delay of 10 working days). 4) How could the total construction time be reduced? The total construction time can be reduced by reducing the critical path. However, this would reduce the construction time to 36 days (reduction of 1 day only). This can be done by constructing the cargo unit 4 & 2, 5 & 3 and 6 & 7 concurrently. We could also look into the construction of aft area (Interim products 10, 11, 12, 13 & 15) where the construction of aft end (13) can be constructed concurrently together with the main engine section. This could further reduce the construction time by another day resulting to 35 days. Although, the construction time can be reduced looking at the above-mentioned areas, there are also other factors to consider such as added manpower for construction of units concurrently, time and space available for constructing 2 units concurrently and availability of resources for construction as the intensity of construction increases due to concurrent construction of the units. Therefore, detailed considerations in the construction are to be analysed before concluding the reduction in the total construction time.

MARINE PRODUCTIONS

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NEWCASTLE UNIVERSITY School of Marine Science & Technology

2008 - 2009 MAR 2313

Part 2 Having established the time to construct the ship, now add to the network to show activities after the float out, and pre-production activities. Final Outfitting at the quay takes 12 days. Sea trials take 2 days. Assembly will take 10 days for cargo units, 15 days for others. Steel cutting for the ship will take a total of 30 days, and must be completed 5 days before unit assembly starts. Steel must be delivered 10 days before cutting starts. Steel orders, from a stockist, have a 20 days lead time. Engineering information for the steel takes 20 days to prepare. Main engine has a 40 day lead time for delivery. Design information for purchasing takes 20 days. Deck cranes have a 40 day lead time for delivery. Design information for purchasing takes 15 days. The above information is tabled as the following interim product:S/N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Interim Product Engineering Information (steel) Steel Procurement (lead time) Steel delivery (lead time for cutting) Cutting of Steel Steel ready for assembly Cargo Unit Assembly Cargo Unit 1 Cargo Unit 2 Cargo Unit 3 Cargo Unit 4 Cargo Unit 5 Cargo Unit 6 Design Specification (Deck Crane) Deck crane delivery (lead time) Deck Cranes Assembly (others) Lower fore end Upper fore end Design Specification (Main Engine) Main Engine delivery (lead time) Lower Engine room Main Machinery Upper Engine room Aft end Superstructure

MARINE PRODUCTIONS

Time to complete 20 days 20 days 10 days 30 days 1 day? 10 days 2 days 4 days 4 days 4 days 4 days 5 days 15 days 40 days 10 days 15 days 6 days 8 days 20 days 40 days 4 days 13 days 6 days 8 days 10 days

Predecessors 1 2 3 4 5 6 7,6 8,6 9,6 10,6 11,6 13 11,14 5 16,5 17,5 19 7,5 20,5 22,5 23,5 23,5

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NEWCASTLE UNIVERSITY School of Marine Science & Technology 26 27 28

Float out Final Outfitting Sea trial

1 day 12 days 2 days

2008 - 2009 MAR 2313

18,24,25,15 26 27

5) What is the total duration of the project? From start of detailed design to delivery? Assuming the same working hours profile, the start of the project is on 20 Jan 09 and the project end date is on 24 Jul 09 (134 working days). See page 6 & 9 for detailed gantt chart. 6) Which planning units are on the critical path? The following interim products are on the critical path:S/N 1 2 3 4 5 6 7 8 9 10 11 15 26 27 28

Interim Product Engineering Information (steel) Steel Procurement (lead time) Steel delivery (lead time for cutting) Cutting of Steel Steel ready for assembly Cargo Unit Assembly Cargo Unit 1 Cargo Unit 2 Cargo Unit 3 Cargo Unit 4 Cargo Unit 5 Deck Cranes Float out Final Outfitting Sea trial

MARINE PRODUCTIONS

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