Simetrikal: Journal of Engineering and Technology

An Approach of Travel Time of Flood Peaks and Runoff Model towards Low Impact Development

Riza Inanda Siregar, Nursyamsi, Ivan — Sat, 29 Feb 2020 00:00:00 +0700

The most crucial point for the planning of the city should be considered flooding conditions. In manipulating the length of the channel, of course also manages the direction of the stream, so that the size of the catchment area in the area will be different. The characteristics of surface runoff of urban drainage systems are essential to determine the effects of runoff reduction towards Low Impact Development (LID). In this study, to make modelling of stormwater runoff characteristics in a city can be analysed by using the Stormwater Management Model (SWMM). This research is to explain the method of approaching travel time of flood peaks and runoff in a drainage network system that needs a rainfall-runoff model, EPA SWMM model that shown flood peak in the return period 5-yr and 10-yr, and need representatives to the graph of travel time and runoff. The result shows that the channel only accommodates return period of flood 5-yr, not the 10-yr. The drainage network system consists of minor drainage and major drainage (river) that can be simulated to reduce the runoff. The approach influenced by the direction of flow and the roughness. These parameters are the vital point to manage the travel time of peak floods. The, by redesign and update the capacity of the channel can reduce the overflow over the nodes (junctions).

Rice Bran Oil Extraction as Trioxolane Raw Material

Sri Handayani, Sofa Fajirah, Enjarlis Enjarlis — Sat, 29 Feb 2020 00:00:00 +0700

Rice bran is a byproduct of rice processing which was generally used for animal feed. Rice bran oil could be used as raw material in the fields of pharmaceuticals, cosmetics, and food oil. The purpose of this research is to extract rice bran into oil as a raw material for Trioxolane using n-Hexane solvent and purify the oil by adsorption using bentonite. Trioxolent compounds were obtained from ozonated fatty acids. Variable extraction time 2, 3 and 4 hours and use of bentonite 2.5, 5 and 7.5 grams from 10 ml of crude rice bran oil. The results obtained an oil yield of each variable extraction time 2, 3, and 4 hours respectively - the value is 8.4, 10, 11%. The optimum operating conditions were obtained by extraction time of 4 hours and refining 75% bentonite. The characteristics of rice bran oil has a moisture content of 8%, an acidic value of 67% mg NaOH/g sample, a peroxide number of 21 mgrek/g sample, an iod number of 46 mgI2 / g sample and the results of fatty acid analysis using GCMS is 33.5 % oleic acid, 24.8% Linoleic acid, 32.6% Palmitic acid.

The Instensity Measurement And Noise Mapping in Fatty Acid Plant Area At PT. XYZ

Chalis Fajri Hasibuan — Sat, 29 Feb 2020 00:00:00 +0700

PT. XYZ is a factory engaged in processing of palm oil derivatives in producing a fatty acid. The machines used in the processing process at PT. Permata Hijau Palm Oleo KIM II Mabar generate the noise. This research aimed to find out the existing noise level and noise mapping, also the proposal of noise control on the production floor. Then, the data collection method conducted through observation using the equivalent noise level (Leq) method and noise mapping was through surfer 14. The data collection conducted in 16 points on the production floor. Furthermore, the result and noise distribution pattern showed that the high noise level was in several points, those were point 5 (85.77); point 6 (86.82); point 7 (86.33), point 8 (88.18); point 10 (86.96); point 13 (86.85); point 14 (87.67). The allowed threshold value refers to the Decree of the Minister of Manpower and Transmigration No.Per.13/MEN/X/2011 is 85 dB. Thus, the company needs to perform noise control such as barrier usage, regularly and scheduled machine maintenance to prevent and decrease the effect of the noise

Production Optimization Design in Supply Chain Crude Palm Oil with Genetic Algorithm Method

Meilita Tryana Sembiring, Haikal — Sat, 29 Feb 2020 00:00:00 +0700

Indonesia is the world's largest producer of crude palm oil (CPO). At peak harvest conditions, frequent accumulation of fresh fruit bunches (FFB) due to abundant raw materials. Based on data from one palm oil mill in the province of North Sumatra, the percentage of FFB stays in the field overnight, which is 41% of the total FFB though, on the one hand FFB that has been harvested must be processed immediately because it can affect the quality of oil to be produced. Besides that, the factors of production and storage processes are also very influential on the quality of CPO. The imbalance in production planning shows that production planning is not yet optimal in the CPO supply chain so that a production optimization design is needed in the CPO supply chain. The genetic algorithm was chosen in the completion of the optimization model because of the complex characteristics of the CPO supply chain. The purpose of this research is to optimize the palm oil supply chain system to minimize production costs. This method shows that the optimum production yield for the third quarter of 2017 is 12,202,285 kg. With the proposed system an increase in the percentage of CPO production was obtained by 8.34% compared to the actual system.

An Availability Analysis of Fresh Fruit Bunches (FFB) by the method of the Food Supply Chain Network (FSCN) PT. XYZ

Andri Nasution — Sat, 29 Feb 2020 00:00:00 +0700

XYZ is a manufacturing company that is engaged in oil palm processing into Crude Palm Oil (CPO) and Crude Palm Kernel Oil (CPKO). Supply chain structure model adopted in PT. XYZ is the Mass Balance. Mass Balance is a supply chain model that allows a claim to be transferred from one certified palm oil products to other products either through physical blending or administratively under tightly controlled circumstances. non-fulfillment of processing capacity due to lack of supply of fruit coming into the plant from the garden supplier FFB does not reach the target supply to meet the plant's capacity, while at the time of supply of the third party can not meet that capacity. This will increase the cost per palm product so that profits earned by the company to be reduced because production capacity is not the same with a capacity / installed capacity owned by the manufacturer. Analysis of the results using the Food Supply Chain Network (FSCN) that causes a decrease in the availability of fresh fruit bunches (FFB) is influenced by the decreasing productivity of the garden as a supply based, which has been aged more than 20 years. Of the six aspects FSCN method, one aspect observed is the development of the supply chain and improvements to the supply-based to do the replanting of consideration to yield potential.

An Analysis of Static Load Test on Sinngle Square Pile of 50 x 50 cm2 Using Finite Element Method in Multy-Storey Building Project , Pluit, North Jakarta

Riki Octavia Rusland — Wed, 27 May 2020 00:00:00 +0700

Planning a foundation for a high building and carrying a large construction burden, must be carried out with a correct, thorough and comprehensive analysis, so that a foundation design is able to carry the burdens that works on it and can carry the loads it receives to ground beneath it safely. This study analyzed the capacity of bearing capacity and the settlement of the hydraulic stressed pile foundation of prestressed concrete square pile of 50 x 50 cm² in cross section of single pile or group pile. The research used empirical method, finite element method program and compared the results with the interpretation of axial static loading test on the Multy-Storey Building Project in Pluit, North Jakarta. The analysis used soil investigation and laboratory study and used 2D and 3D finite element methods by Mohr-Coulomb and Soft soils models. The result of the analysis on the ultimate bearing capacity of hydraulic stressed pile foundation with empirical method of Meyerhof gave the highest value using SPT data at DB1 borelog point of 655.23 tons, and the lowest was the result of interpretation of Loading Test by Davisson’s method of 260.00 tons. The ultimate bearing capacity required by ASTM D1143-81 (1989) for the Static Axial Loading Test is 300 tons (200% of working load), while the interpretation of the Davisson’s Loading Test method (260.00 tons), Chin (267,86 tons) and Mazurkiewicz (267.00 tons), none of which have fulfilled the requirements for carrying 150 tons of working load. The lateral bearing capacity of Broms method was 16,14 tons which was the strength of the pile material against lateral loads. Whereas for the bearing capacity of the group pile ( 6 points in one pilecap) the lowest efficiency of 0,734 from the Converse-Labarre Equation and the highest efficiency of 0,805 from the Los Angeles Group Action Equation was obtained. For 200% of the planning load of 150 tons, that is 300 tons, the settlement of the single pile which occurred from 2D finite element method program were 18,00 mm and 15,63 mm for 3D while the results of the Loading Test was 15,00 mm. The results of the analysis of Loading Test settlement was more realible.