E-Journal Universitas Janabadra
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KAJIAN HITUNGAN DEBIT ALIRAN MELALUI PIPA BERPORI TERHADAP KAPASITAS: MEDIA POROUS, PORI PIPA, DAN ORIFICE
No full textWater intake through porous pipes for shrimp farming purposes can be done through the water springs, water seepage, and sea water retrieval. This study aims to calculate the discharge capabilites through porous pipe compared with the ability of porous media, pore capacity of the pipe, and the pipe full capacity in the discharge pass.This study was conducted by calculating discharge through a porous pipe based on existing formulas, and then compare it with porous media capacity, pore capacity of the pipe, and full capacity of the pipe in the discharge pass.Findings showed that the greater of the value of the ratio between the size of the pores with wide circumferential pipe when not perforated (Af/A), then the value of the discharge coefficient will be smaller, while the value of discharge (Q) will be even greater. Then the amount of discharge through porous pipes are under the capacity of porous media capacity, pore pipes capacity, and orifice pipe flow capacity. Thus, it can be concluded that the discharge occured is discharge based on the porous pipe capacity formula.Keywords: Discharge, porouspipe, porousmedia, porepipes, andorifice
ANALISIS PRODUKSI PADA MESIN SPEED DENGAN PENDEKATAN TAGUCHI UNTUK MENGURANGI CACAT PRODUK DI PT INDUSTRI SANDANG NUSANTARA
Full text linkABSTRACTPT Industri Sandang Nusantara (PT ISN) is a yarn spinning company located at Secang, Magelang. The company currently produces the kind of yarn use raw material polyester. Polyester are sent by PT ISN center. PT ISN using a variety of machines in the production process, one that is machine Speed / Roving machine. Problems encountered in machine Speed is yarn unevenness (CV%). Methodology used in this is identify factor control and factor noised; and what impact on output. Second, choosing orthogonal arrays (OA) is appropriate. Third, after identifying and influence, the next step is to conduct experiments. Forth, the data processed using ANOVA test and S/N Ratio. Fifth, confirmation of the results of research use Loss Function. From the analysis of the data collected on the PT ISN, the obtained results : total failure occurring is 7% of the total production, with the contribution of failure unevenness is 42.30%. Taguchi method is used to determine design the best configuration parameters of machine. The design of machine configurations obtained from this study shown to reduce losses due to defects obtained deviation decrease in yarn unevenness (CV%) of 67.30%. Based on the facts in the field any defect in the engine speed will return to the beginning of the blowing machine and could cost Rp 15.000/product disability. As for the total loss function before the application is Rp 15.300 and after the application of the method Rp 5.300, so the company could save Rp 10.000.Keywords : roving machine, orthogonal arrays, ANOVA, S/N Ratio, Taguchi loss function
ANALISIS EVALUASI DIMENSI BANGUNAN PELIMPAH BANJIR (SPILLWAY) SITU SIDOMUKTI
No full textThe purpose of Sidomukti Situ spillway building was to evaluate the dimensions and the capability of spillway building to discharge flood events with a possible maximum flood (PMF). Evaluation was conducted by calculating the flow through the top point of spillway building by using the formula : Q = m.B.H1,5, where: Q is the flow through of spillway = PMF discharge (m3/dt), B is the width of the spillway body's (m), H is the height of water in the pond = high pressure above the spillway (m), and m is the coefficient of spillway. With the above formula, high pressure above the spillway (H) can be calculated, where the value of B is determined. Wide unity discharge planning was formulated : q = Q/B, where: Q is the flow through the spillway = 50 annual flood disharge (m3/dt) and B is the width of the spillway body's(m).Based on the evaluation results obtained in the high-water elevation above spillway building generated when successive return periode for 5, 25, 50, 100, and 1000 years is 1.43 m, 1.56 m, 1.61 m; 1.64 m and 1.75 m, the length of the pool megrim is 16.22 m, 17.29 m, 17.64 m, 17.94 m and 18.76 m respectively.Keywords:dimension, spillway, small da
ANALISIS DEBIT BANJIR RANCANGAN REHABILITASI SITU SIDOMUKTI
No full textSedimentation and hoarding by people has made the Situ Sidomukti shallow. Beside that, illegal occupancy has made change of land function to housing and agriculture. The purpose of the analysis of the Situ Sidomukti flood discharge rehabilitation design is primarily to evaluate several hydrological parameters, such as designated rainfall (intensity, duration, and frequency/IDF rain), time of concentration, run-off coefficient, recharge area, and flood discharge design. While the purpose of the flood discharge design analysis was to estimate of the flood discharge design at various timing (2, 5, 10, 25, 50, 100, and 1000 years), including its hydrographic form.Due to the unavailability of data flow and considerably small data of recharge area, the analysis was conducted by using a rational equation: Q = C . I . A, where Q is the discharge, C is the run-off coefficient, I is the rainfall intensity, whereas A is the recharge area. The flood discharge design parameters are the designated rainfall (intensity, duration, and frequency/IDF rain), time of concentration, run-off coefficient, and recharge area.According to the parameter above, Situ Sidomukti flood discharge time of occurance for 2, 5, 10, 25, 50, 100, and 1000 years are 20,72 m3/sec, 23,76 m3/sec, 25,35 m3/sec, 27,05 m3/sec, 28,14 m3/sec, 29,13 m3/sec, and 31,89 m3/sec respectively with triangle hydrographic form and the length of concentration time was 2,7 hours. These values should be evaluated againts existing volume/channel. Keywords : Discharge, run-off coefficient, rainfall intensity, recharge area, return period
DEBIT ALIRAN AIR TANAH MELALUI PIPA BERPORI SISTEM SUMUR KOLEKTOR BERJARI
Full text linkThis study based on the salt-water shortage in shrimp-pond on the sand coastal area of Dukuh Kuwaru, Desa Ponco Sari, Kecamatan Srandakan, Kabupaten Bantul, Propinsi Daerah Istimewa Yogyakarta which is managed by PT. Indokor Bangun Desa. Proposed solution to overcome this problem is collector well system which expected to supply salt-water adequately. This study conducted to examine the relationship of soil permeability (k), water level (h), and the relationships of collector system [pipe diameter (D), pipe length (L), pipe depth (l), and perforated area (Af)] on discharge of water flow through perforated pipe (Q). The study also reveals the discharge empirical formula resulted from dimension analysis(Q) through perforated pipe on collector well system.The research being conducted by making physical experiments of collector well system on the laboratory which consists of water basin made from brick work installation and three perforated pipes (total perforated pipes are 27), then filled by sand and water on several variations. Thus, water flow discharge on each perforated pipe measured using calibrated beaker.Results indicate that several parameters influenced significantly on discharge (Q) are:Q = f (k, D, L, l, Af, h)Therefore, empirical formula of collector well system which represents the relationship between Q/k.L.D and Af.h/L.D.l are:These empirical abbreviations then can be used in order to plan perforated pipe of collector well system.Keywords: discharge, ground-water flow, perforated pipe, collector-wel