Training Balance Analysis Of 3 Kg Lpg Tube Retester Repair Using Ranked Positional Weight Method In Pt. Earth Trans Energy Wajo Regency South Sulawesi Province

PT. Bumi Trans Energi is one of the companies engaged in 3 Kg LPG cylinder retested repair, this company repairs 3 Kg LPG cylinders that have been damaged for 5 years, damage to the handguard, and footring , and welded joints on the tube. In the repair process, there are 5 stations and 21 work processes, PT. Bumi Trans Energi encountered a problem in the repair line at station 1, and a bottleneck occurred . This bottleneck occurs because the production flow is not smooth from one station to the next, this problem causes each work station in the repair path to have a different speed level, which causes material accumulation between work stations , and waiting times between work stations . For this reason, this study aims to determine the number of workstations needed to get maximum efficiency and balance the repair process line when bottlenecks occur. Observations were made in data collection 30 times, each work element was observed and calculated in the data uniformity test and data adequacy test to obtain standard time. The results of this study were the application of 3 work stations from 5 initial work stations, there was a reduction in idle time to 425,74 seconds ( 7 minutes) following the increase in track efficiency to 84,17 % the balance delay decreased to 15,83 %, and the Smoothness Index was 212,63. The actual idle time was 1004,97 seconds (17 minutes) while the proposed trajectory idle time used the Ranked Positional Weight method of 425,74 seconds (7 minutes). The difference between actual and proposed idle time is 10 minutes, and the placement of work elements at work station 1 (one) consists of 9 work operations, while work stations 2 (two) consist of 1 work process, and work stations 3 ( three ) consist of 8 work processes.


INTRODUCTION
PT. Bumi Trans Energi is a company engaged in 3 Kg LPG cylinder retested repair, this company repairs 3 Kg LPG cylinders that have been damaged for 5 years, damage to the handguard and footring, and welded joints on the tube. In the repair process [1]. there are 5 stations and 21 work processes, at station 1 (there are 8 work processes, namely removing the remaining gas in the tube using a purging gas machine, seeing tube leaks using the initial leak test machine, opening the valve using the open valve 1 engine [2]. opening the valve using the engine open valve 2, test valve using a test valve machine, repairing the handguard and footring using a handguard and footring press machine [3]. repairing the handguard and footring using a handguard and footring press machine, weighing tubes using a digital scale), station 2 (there are 2 work processes namely looking at the amount of volume development in the tube using a hydrostatic test machine [4], [5]. giving the month and year on the right side of the tube handguard using a stamping machine), station 3 (there are 2 work processes, namely welding on the tube that is damaged by the handguard and footring using a welding machine, inserting the tube in the tube) [6], [7].
in annealing using an annealing machine), station 4 (there are 3 work processes, namely cleaning the rest of the paint, rust, and dust using a sandblasting machine, cleaning the remaining paint on the tube manually using a brass wire brush, checking the inside of the tube manually using an inspection camera), and station 5 (there are 6 work processes, namely painting the tube using a paint machine, installing markings and logos manually). manual, installing the valve on the tube using the valve fitting machine 1, installing the valve on the tube using the valve fitting machine 2, pressing the tube that has been repaired using the final leak test machine, the tube is weighed which has been repaired using a digital scale) [8], [9].
It is indicated that there is an imbalance in the path so it requires performance improvements in the line assembly to reduce the occurrence of bottlenecks that have a cycle time that is longer than the predetermined production cycle time. Therefore, it is necessary to identify bottlenecks and efforts to reduce cycle times at the bottleneck stations to increase production capacity so that demand targets and improvement targets can be achieved [10]. The cause to be identified is the bottleneck in the line assembly section. A bottleneck is a condition in which an operation or facility limits or hinders the output for one line of improvement. The reason for selecting a bottleneck to identify is because a bottleneck has a direct impact on the decline in the company's improvement results [11].
Bottlenecks in the production line result in reduced repair results achieved because there are semi-finished products that are idle in the production line or called work in process and using the Ranked Positional Weight method because this method is different from the method that has been used previously for track balance in manufacturing companies [12]. as well as service companies on the production line. This method will improve the trajectory balance of the 3 Kg LPG cylinder retested repair [13]. To carry out the product functions properly, a series of activities are needed that will form a production system. The production system is a collection of sub-systems that interact with each other to transform production inputs into production outputs. These production inputs can be in the form of raw materials, machinery, labor, capital, and information [14]. Meanwhile, production output is the product produced and its by-products, such as waste, information, and so on [15]. The production line is the placement of work areas where these areas have various sequential operations according to the rules and the continuous movement of materials through balanced operations [16].
Based on the problems above, this study aims to analyze the balance of the 3 Kg LPG cylinder retested repair trajectory using the Ranked Positional Weight method [17]. Direct questions and answers to certain parties in the production department at PT. Earth Trans Energy is associated with objects researched problem.

Documentation
documents and company records related to the object under study.

Measurements
Measurement of time with a stopwatch for each work element on the 3 kg LPG cylinder retested production line.

Data Processing
The data processing used in this study uses the Ranked Positional Weight (RPW) method, this method is a combination of the great candidate rule method with the region approach method [18]. The RPW value is a calculation between the work elements and the position of each work element in the priority diagram [19], [20]: (1)

Data Uniformity Test
Data uniformity test needs to be done first before using the data in order to it is known whether the data is in a state uniform toset the standard time.
Example of data uniformity test calculation on the work element one can be seen as the following :

Westinghouse, Cycle Time, Normal, Standard
Cycle time is the sum of each job element, normal time is the time for completion of work completed by workers in reasonable conditions and with average work ability, and standard time, which is the time required by normal workers to work normally. complete the work carried out in the best work system of the time. The recapitulation of the calculation of the normal time value for all work elements can be seen in Table 6.  ction Line Condition Initial production line conditions to identify whether it needs to be repaired or not, so that the production line can be better. The initial production trajectory can be seen below: Source: (Processed Data, 2022)

Solving Using the Ranked Positional Weight (RPW) Method
After knowing the results of the actual path for repairing 3 Kg LPG cylinders, the next step is to calculate the proposed path using the Ranked Positional Weight (RPW) method.  (7 minutes). The difference between actual and proposed idle time is 10 minutes. 2. Placement of work elements at work station 1 (one) consists of 9 work operations, while work station 2 (two) consists of 1 work process, and Workstation 3 (three) consists of 8 work processes.

Suggestions
Based on the research results that have been obtained, the authors provide suggestions to PT. Bumi Trans Energi, namely because the repair trajectory is very important so that the 3 Kg LPG cylinder retester repair process is better, there needs to be improvements so that the 3 Kg LPG cylinder retester repair process is balanced, it is hoped that the company will implement a trajectory balance system with the Ranked Positional Weight (RPW) method as an improvement the process of repairing the 3 Kg LPG cylinder retester in the future so that demand is achieved on time