WORK METHOD & FACILITIES ANALYSIS WITH ERGONOMICS APPROACH ON VALVE ASSEMBLY

The case study carried out in a company in Batam, which the company is engaged in oil services. In this company, the assembly is done manually, causing some inconvenience of work experience in working for less body position corresponds to the placement of the material. Such conditions lead to potential injury. From the results of the initial interview to the 23 employees, there are 18 employees who complained of discomfort in performing valve assembly. To reduce the potential for injury to the operator, the researchers wanted to perform repair work station so that operators can more effectively on doing their job.

Methodology: The methods used in the conduct of this study are as follows:
1. Determination of Anthropometric Dimensions In designing the height of groundwork for the standing position, in principle similar to the design height of the groundwork cradle position. Ergonomic recommendations about the height groundwork standing position based on the height of the elbow stands as follows.
a. To work requires precision with a view to reducing the release of static on the back muscles, high working basis is 5-10 cm above the standing elbow height.
b. During manual labor, where work often require space for equipment; material and containers of all types, high working basis is 10-15 cm below the rate stood tall.
c. For jobs that require suppression with robust, high working basis is 15-40 cm below elbow height stand.
2. Positioning work
Working position stand also has both advantages and disadvantages. Stance is the standby attitude both physically and mentally, so that the activities of the work done faster, stronger and thorough. However, changing the sitting position to standing still use the same tool to be exhausting work. Basically the stand itself is more tiring than sitting down and energy expended to stand more 10-15% compared with sitting. In the design of work stations stand, if workers have to work for a period of time, then became a major fatigue factor.

Findings: Repair work system with ergonomics can reduce or eliminate the work process in a bent position, which in the previous process is done in three working positions, namely squatting position; bending; and stood up. So by using this working table work process is only done with the squat position and stand alone. In 285 minutes the assembly process assembly gate valve, before the fix is 7 process where employees should do the job with a hunched position, using the design workbench by 3 sizes anthropometry ie the height of the elbow to the floor to take a percentile value of 50 by 99 cm, the value of percentile 50 high shoulders off the floor of 132 cm and a percentile value of 50 long arm of the operator by 67 cm, then the process of working with a bent position
becomes nil, because the adjustment of the position of the work-piece as mentioned above, so as to produce better work, with application of the work table of the time process decreased by 9 minutes.

Contribution: Research using ergonomics methods has never been done before at the valve assembly in this company. From the
research, the perceived usefulness of which is earned by the company:
1. Reduced working time required for the valve assembly
2. With an ergonomic position, lessening the possibility of injury will be experienced by the operator.