Jurnal Teknika Akademi Teknologi Warga Surakarta


Edisi 8, Nomor 2
Judul Analisa Tekanan Air Dengan Methode Pipe Flow Expert Untuk Pipa Berdiameter 1 ”, ¾ ” dan ½ ” Di Instalasi Pemipaan Perumahan
Penulis 1).Arif Setyo Nugroho, 2).Martinus Heru Palmiyanto, 3).AEB Nusantoro 3). 1,2,3) Laboratorium Mesin Fluida, Jurusan Teknik Mesin AT Warga Surakarta

The rate of flow and the head lost that occur in each pipe should be considered in the installation of the pipe network, so that water cam be evenly distributed in each branch of pipe. In an analisys using the expert pipe program, it can be known the flow rate discharge and pressure working in the installation.

The highest flow, enter pressure and exit pressure happen in the pipe number 11 with pipe flow 0,0026 m2/s for pipe diameter 1. In pipe 3/4-1 is 0,0013 m2/s and in pipe 1/2-1 is 3567 m 2/5. The highest enter flow velocity happens in the largest pipe with diameter 1. The speed is 4.75 11 m/s. For pipe diameter 3/4 is 3819 and for pipe diameter ½ is 35 67 m/s. Enter pressure happens in pipe 1-1 3/4-1 and 1/2-1  it is 1.0979 bar or 1.119546 kg/cm2. Exit pressure on each pipe is the same and the highest pressure for pipe 1 is 1.054896 bar or 1.0345 kg / cm2, 3/4 is 1.3654 bar or 1.392 321 kg/cm2, 1.0345 kg/cm2, 3/4 is 1.4654 bar or 1.392 321 kg/cm2, 1.0345 kg/cm2 pipe diameter, 3/4 is 1.3654 bar or 1.392 321 kg/cm2
, pipe diameter 1/2-1 is 1.3345 bar or 1.3663 kg/cm2. The highest connection  pressure in diameter 1-1 is as big as 1.360811 bar or 1.3345 kg/cm2, and lowest the pressure is 1.001 bar or 1.019818 kg/cm2.

The highest connection pressure in diameter 3/4 is 1.3654 bar or 1.392 321 kg/cm2 and the lowest pressure is 1.0001 bar or 1.019818 kg/cm2

Key Word : Pressure, flow, velocity

Paper 8 - 2 PDF
Edisi 8, Nomor 1
Penulis Farit Ardiyanto 1). 1) Jurusan Teknik Elektro, AT. Warga Surakarta

Nurses caller tool is needed to improve services at the hospital. Conventional tools is very complicated nurse caller, because to deal with one patient requiring a pair of wires. So to handle the number of 64 patients requiring 128 cable. It is very influential on the problems of distance and dimension the network so as to treatment more difficult.

The purpose of this study was to use the cable to the efficiency appliance caller conventional nurse, so the number of wires used to be a bit, but is able to handle more number of patients in the longer distances. The method used is to create a unique code for identifying the location of the patient. This identification code will be sent in serial order can be delivered in a relatively far distance.

By using serial methods and standard RS-485 interface, it will save the cable network and increasing the  distance significantly. In the method with standard serial RS-485 interface it only takes one pair of wires to handle 128 patients at a distance of up to 1.2 Km.

Key word : RS-485, nurse caller, serial

Paper 8 - 1 PDF
Edisi 7, Nomor 5
Penulis HS. Widodo 1); Musabbikhah 2) Retno Tri Nalarsih, ST., MT 3). 1);2) Department of Mechanical Engineering AT.Warga Ska email : mus_a2002@yahoo.com. 3) Department of Civil Engineering Univet Bantara SKH

The problem faced PT. Tasik Madu Karanganyar is the abundance of waste bagasse ash that disrupt the neighborhood. For that we need waste treatment and use as a mixture of earthquake-resistant light concrete block to increase its economic value. Independent variables used in this research are baggase ash composition (A), the composition of sand: cement (B) and stirring time (C). The interaction between two main factors are the AXE, AXC and BXC. Meanwhile the dependent variable is the compressive strength. The quality of characteristics that are used to optimize the compressive strength is "larger The
Better" (LTB).

The results of the research showed that the composition of bagase ash, the composition QT sand: cement and the stirring time, each for 36,558%, 15,896%, 21,6 72%. While the interaction between two factors: AXB, AXC ami BXC contribute to the compressive strength of concrete blocks 5.136%, 5.398% and 1.328%. The optimum compressive strength of lightweight concrete blocks resistant ta earthquake achieved in AIBICZ conditions, the meaning that a composition baggase ash 20%, the compotition sand to cement 8:0. 75, and stirring time 4 minute. The average compressive strength of concrete blocks is 330 KN. At the beginning, the S / N Ratio is 50.315. At improved condition, the value of S / N ratio increased
to 51.432. The Cp value at the initial conditions is 1, and Cpk of 0. 999. The Cp and Cpk value are significantly increased to 1.137 at the improved condition, the meaning that resulting concrete blocks able to withstand the earthquakes that occurred with an optimal strength.

Keywords: Baggase Ash, Lightweight Concrete Block, Compressive strength, Taguchi

Paper 7 - 5 PDF
Edisi 7, Nomor 4
Penulis Suhardnlto 1), Amin Supardi 2), Edy Suryono 3). 1),2),3) Jurusan Teknik Mesin, Akademi Teknologi Warga Surakarta

The main problem from using the coals to be fuel is because the waste produced from
combustion it is yielding the fly ash and bottom ash. Both Q’ them are dangerous waste and poisonous or B3.

To overcoming this problem in this research was done coals condensation in order to changing
Sand to be come paving block profil and then continued to strength power test. That all are considering filter of waste coal diameter, Sand composition and cement, main coals composition.

The Result of research is showing how to reach precise the material composition of coals
waste and Sand to produce the paving block, is needed set parameters of A IBJC Z optimumly. That mean is needed filter diameter composition (A)lmm, Sand composition and cement (B)30% and waste coal composition (C) 10%

Key word : Waste Cools, Coal diameter and composition, power strength, paving block.

Paper 7 - 4 PDF
Edisi 7, Nomor 3
Penulis Arif Setyo Nugroho 1). Heri Kustanto 2), Supardi 3). 1);2);3) Jurusan Teknik Mesin AT Warga Surakarta

More big speed of fluid flow at pipe . hence loss of head would increasingly bigest, Think
theoretically happened because speed of fluid flow compares square straight to loss head. Loss of head at the biggest test pipe happened at pump is compiled by parallel with position of full open valve for water fluid ( 0,226 m),while for loss detergent water fluid media of the biggest head also happened in pump compiled parallelI_v and fiill open valve ( 0,167 m). Loss of head at smallest test pipe at pump is compiled singlely with position of valve is closed 3/4 for water
fluid ( 0, 004 m). while for loss detergent waterfluid of smallest head also happened in pump is compiled by single with position of valve is closed 3/4.( 0, 00321 m)

Loss of head at test pipe declines increasingly minimizes of equiamplitude surface area of valve from open position full of comparesion loss of head between water fluids and detergent water either at major and also minor loss of revers that though detergent fluid has viscosity larger ones compared to adhesion force at detergent water fluid causing generates loss of head larger ones at installation

Key Word : head losses, viscosity, pump, flow at pipe

Paper 7 - 3 PDF