ANALYSIS OF SHIP WAITING TIME TO GET SHIPYARD SERVICE AT PT. DOKP AND SHIPPING WAIAME IN AMBON CITY

Published: 05-09-2020 Abstract. The purpose of this research is to determine the best service system that can be applied by PT. Dokp and Shipping Waiame Ambon. so that the waiting time can be pressed. This research is descriptive research, with the population in this study is the entire number and type of ships that have docked at PT. DOKP and Waiame shipping for 13 months. The sampling method used in this research is Convenience Sampling. The sample used in this study is the number of ships repaired in a period of up to 13 months. The analysis tool used is queueing theory of multi channel-single phase model. The results showed that the average arrival rate of ships per month is as many as 9 units of ships, while the average length of docking as much as 3 units of ships / month. Therefore, it can be seen that the level of service is not optimal to reduce the arrival rate of ships, and the chance of idleness by 2. Therefore, the arrival of ships is more than the level of ship service at PT. Dokp and Shipping Waiame Ambon.


INTRODUCTION
In the field of marine transportation, the maintenance of ships in the field of sea transportation is one of the most important activities because it can determine the feasibility Kiat,Analysis of ship Waiting Time to Get Shipyard … 41 of a ship. In addition, ship maintenance is one of the very complex and dynamic processes with interdependence between variables that are quite high, one of which is information.
However, most of the information scattered in several stages of the process is generally incomplete and reliable. The level of accuracy of the estimated duration of ship maintenance affects the quality of shipyard service and becomes very important as a result of the shipyard's business process. If the maintenance duration is too long, then the shipyard will become unespective and if the duration becomes shorter, then the material supply schedule will fall apart and reduce the quality of workers' work performance due to unrealistic duration (Srdoc et al. 2006).
The shipyard is a place designed to build, maintain and repair ships. Currently there are about 240 domestic shipyard companies spread across Indonesia, 37% on the island of Java, 26% on the island of Sumatra, 25% in Kalimantan and 12% in the eastern region of Indonesia, with a ship building capacity of 140,000 GT (Gross Tonnage) per year (Windyandari, 2008).
Queues, is a phenomenon that often occurs when the demand for a service at certain times exceeds the capacity of the service. In general the busy period can be described with the process of the queue system starting when the customer arrives, then waiting, and will end when the customer leaves the system. Throughout busy periods there is always at least one customer in the system (Ferreira, 2011:195). The occurrence of queues and human behavior becomes something that is inseparable from the problem of queues, this is one of the factors of uncertainty (randomize) and also very influential in the service system. One way that can be used to observe systems that contain uncertain factors is to use a single service queue system method and that will present a real system, with which it is possible to be able to observe how this method system behaves. The more capable the service system imitates the real system, the better the method.  The analysis method used in this study is quantitative analysis method, where there are 3

PT. DOKP and Shipping
(three) components in the queue system that will be measured, namely: 1) arrival, population to be served (calling population); 2) queue; and 3) service facilities. The analysis tool used is queue by using multi channel-single phase method. Multi channel-single phase is a method that occurs (there) anytime two or more service facilities are watered by a single queue, to find out can be seen in the following scheme.

Shipbuilding Process
The work when the ship enters the shipyard or the repair process are: Anchor care on the anchor rod (Shank), Nail anchor hook (throat) and anchor chain by cleaning the rust and salt of sea water and cleaning between the anchor rope holes with a brush and special oil. 4 Welding Repair of the ship starting from inside the ship part is the construction profile or skeleton of the ship, then following the leather part of the ship and hull in the form of plates. 5 Drilling Maintenance of the vessel by drilling the hull plate that has been thinned or perforated due to rust or collision and replacing the plate with the same thickness as the part that is not drilled.

Painting
The painting process is done after the ship in blasting, the use of paint for ships on PT. Waiame Ambon dock and shipping are basic paint, AC paint (anti-rust paint), AF paint (anti-marine animal paint, mushrooms and marine plants 7 zinctanado. A mixture of Tin, aluminum, magnesium, which is used to protect the iron against corroation or rust attached to the hull and attached to the ship's plate.

Queue Process
On this model the distributed arrival of poisson and exponential service time. In this situation, the arrival forms a single line to be served by a single station. It is assumed that the system is in the following conditions.
1. Arrivals are served on the basis of First Come First Serve (FCFS) and each arrival waits to be served, regardless of the length of the queue.
2. Arrivals are not tied to previous arrivals, it's just that the average number of arrivals does not change by time.
3. Arrival is illustrated by poisson probability distribution and comes from an infinite (very large) population.
4. Service time varies from one ship to the next and is not tied to each other, but the average level of service is known.

5.
Service time corresponds to the distribution of negative exponential probability.
6. The level of service cannot keep up with the level of ship arrival.

M/M/s Queue Model Analysis Results
According to Heizer and Render (2009)  5. Probability of 0 units of ships in the system or the level of possibility of idle service (P0) is 2%.
6. The service level of The Shipyard Line (P) is 3% per month.

DISCUSSION
The results of the study conducted by the author at PT. Dokp And Shipping Waiame Ambon is to determine the best service system that can be applied by PT the average rate of ship arrival per month is as much as 9 units of ships, while the average docking time is 3 units of ships / month. Therefore, from this data, it can be seen that the level of service is less optimal to reduce the level of ship arrival, and the chance of idleness by 2. Therefore the arrival of ships is more than the level of service of ships at PT. DOKP and Waiame Ambon Shipping.
Rambat Lupiyoadi (2006) suggests that services are all economic activities whose results are not products in physical or construction form, which are usually consumed at the same working hours on a daily basis. The service time starts from 08.00-17.00 WIT. During the observation time there is that the longest waiting time of the shipyard service is at the Central Line Air Bag System Shipyard for 10 days, while the fastest shipyard service tuggu time for 2 days is. the average rate of ship arrival per unit time is as much as 9 units of ships, while the average dock length is 3 units of ships. Means the average arrival rate is greater than the service level