W2_INDRA_APROVAL DRAWING SCHEDULE CALCULATION

1.            Problem Recognition, Definition and Evaluation

The first critical point in Shipbuilding Project is Approval Drawing. Before the drawing approved by owner, shipyard designer can’t deliver the working drawing to be executed in the production process. Owner and Shipyard already assigned the agreement about Approval Drawing procedure as follows :

-       Shipyard send proposed drawing maximum 40 sheets every 2 weeks by email

-       Owner receive, print, check, give comments (if any), stamp and send it to Shipyard maximum 14 calendar days from the received date

-       Shipyard receive the approved drawing, and should give response for drawing with “with comments” stamp in the next revised drawing. Drawing with “no comment” stamp means Owner accept the drawing to be processed as working drawing

At 10 September 2012 morning, we received first package of basic drawing from Shipyard YYY, the builder of our new project. Based on our agreement, the drawing should send back to shipyard NLT than 24 September 2012 evening. There are only 2 Naval Architects and 1 Mechanical Engineer remain in office until 31^st September 2012. Based on the quantity and complicate level of each drawing, the parameters can be describe as below :

1.     General Arrangement (1 sheet), need 2 days to be checked by Naval Architect

2.     Shell Expansion (1 sheet), need 2 days to be checked by Naval Architect

3.     Engine Room Construction Details (11 sheets), need 4 days to be checked by Naval Architect

4.     Cargo System (2 sheets), need 1 day to be checked by Mechanical Engineer

5.     Engine Room Arrangement (8 sheets), need 4 days to be checked by Mechanical Engineer

6.     Need 1 day to print all drawing on A1 paper by Admin

7.     Need 1 day to finalize all the check result and stamp the drawing

8.     Need 1 day to send the approval drawing to the Shipyard

9.     General Arrangement is the basic drawing for the other. Before the General Arrangement finished, the other drawing can’t be started to check

10.  The check results of Engine Room Construction Details drawings are needed for check Engine Room Arrangement drawings

11.  Saturday and Sunday are no working days, it means the effective days only 10 days

Based on these points, herewith the schedule calculation of approval drawing :

Figure 1. Approval Drawing Scheduling

Problem :

The schedule calculation have a negative float, the approval drawing can’t be finished on 24^th September 2012. We need 2 more days

2.            Development of  the Feasible Alternatives

Figure 2. Brainstorming to develop the feasible alternatives

By brainstorming, we develop the alternatives to solve this problem as follows :

a.     Add resources.

b.    Overtime on Saturday or Sunday

c.     Improve the work process

3.            Develop the outcomes for each alternative

a.     By add 1 Mechanical Engineer, the E/R Arrangement drawing can be checked and finished on 2 days only

Figure 3. Approval Drawing Scheduling by added 1 Mechanical Engineer

b.     If 1 Naval Architect working on Saturday 15^th and the Admin working on Saturday 22^nd , the Approval Drawing can be finished as the calculation below :

Figure 4. Approval Drawing Scheduling by working on Saturday

c.     Improve the work process : The bottleneck is E/R Construction Details drawings. We have to focus on these drawings and found that some sheets in E/R Construction Details drawings only dedicated for some sheets in E/R Arrangement drawings. It means we do not need to wait all the E/R Construction Details drawing finished to start check the E/R Arrangement drawings. The flow process can be divided and done separately as below :

Figure 5. Approval Drawing Scheduling by Check E/R Construction Details Separately

4.            Selection of the acceptable criteria.

Our concern is finished the approval drawing in 14 days, means the acceptable criteria is time. In addition, the engineer’s working time should be considered because they have some hard job in field shift. Office shift is the only time they can enjoy Saturday and Sunday with their family

5.            Analysis and comparison of the alternatives

Added resource means we call 1 Mechanical Engineer from the other project back to office. It spent more time than check the drawing itself.

Overtime means 1 Naval Architect should be working on Saturday, we can’t mitigate the risk from his wife.

Improve the work process in E/R Construction Details and E/R Arrengement needs a big table. The E/R Construction Details sheets are linked each other, sometime Naval Architect need to see his checked result sheet again, which already given to Mechanical Engineer. The Naval Architect and Mechanical Engineer should check on the same table. Open 19 sheets of A1 size need minimum 2 m x 6 m table. We have this table size in meeting room

6.            Select the preferred alternative

Based on our consideration about time and engineer’s holiday, improve the work process by check E/R Construction Details separately based on the priority for E/R Arrangement drawings is the preferred alternative we may use.

7.            Performance Monitoring & Post Evaluation of Result

Actually the Naval Architect and Mechanical Engineer finish all the approval drawings on 18^th September and the drawings be stamped on 19^th September (2 days ahead of our schedule). One thing we forget in the planning is unmarked holiday on 20^th September regarding “Kumis VS Kotak-Kotak” Election. Actually the approval drawing can be send on 21^st September (1 day ahead schedule)

Reference

                         i.        Project Time Management - Formulae Section,  Retrieved from:                                                      http://www.pmstudy.com/trainingdocs2/TimeManagementFormulae.pdf

                   ii.        Critical Path Method Tutor for Construction Scheduling & Management, retrieved from:

http://www.cpmtutor.com/c06/tf-notation.html

     iii.    Calculating & Using Float, retrieved from:

http://www.mosaicprojects.com.au/PDF/Schedule_Float.pdf