PENGKAJIAN FLEXIBLE COUPLING VICTAULIC TYPE 75 DIAMETER 4 INCH DENGAN PENGUJIAN KEKERASAN, KOMPOSISI KIMIA DAN METALOGRAFI

Flexible coupling is a pipe connecting device is equipped with vibration damping piping system. One example of flexible coupling on the market is victaulic flexible coupling type 75. To determine the quality of flexible coupling, to be known mechanical properties and micro structure of the material. Tests conducted include hardness testing, chemical composition testing and metallographic. Test results showed that the material used as a flexible coupling it is nodular cast iron, (ductile iron). Hardness values for ductile iron 172.9 BHN, while the tensile strength value about 596.59 MPa obtained by converting the value of hardness of the material. From the metallographic testing is known that ferrite content is more dominant than the pearlite will enhance the material toughness. The element carbon is more than usual ductile iron standards of more than 4.584% so that the hardness will increase the value of flexible coupling

PERANCANGAN LIFT PENUMPANG KAPASITAS 1000Kg KECEPATAN 90M/Menit DAN TINGGI TOTAL 80M DENGAN SISTEM KONTROL VVVF

An elevator which also called as lift is handling equipment that is often applied at high rinse building. In this lift design, designs a lift that applied at 20 floors building, with lift’s overall height equal to 80m. The applied method for this design is do observation, then do the phase of design with known standards, and literature study. From this design, lift uses induction motor with 11kW of energy that equiped by VVVF control systems. The car, which is loading 15 people, pulled by 6 wire ropes 8x19 type with 13mm of diameter. The car guided by rail type T90 and equiped by safety system, that is safety gear wedge type

PEMBUATAN FLEXIBLE COUPLING HYDRANT PIPE DIAMETER 4 INCH DARI BAHAN DUCTILE CAST IRON DENGAN PENGUJIAN TARIK, KEKERASAN, KOMPOSISI KIMIA DAN METALOGRAFI

This flexible coupling is fabricated using the ductile cast iron material in a casting process. Casting is a process of melting a material and then molded it to suit the need. Flexible coupling is a device to join the pipe that provided with damper in a piping system.To know the quality of the ductile cast iron, the properties and micro structure of the material should be known. The testing to know this properties are hardness test, tensile test, and chemical composition and metallurgy. Ductile cast iron have a hardness 285 BHN, this value is bigger than the flexible coupling Victaulic type 75 which have 172,9 BHN in hardness.The tensile test have the value of 466,66 N/MM2, which is smaller than the mean value in hardness conversion that have the value of 898,98 MPA. This is caused by the imperfection in a cating of the specimen, for example air cavity defect. The tensile strength of ductile cast iron using the hardness conversion is bigger than the flexible coupling Victaulic type 75 which have 596,59 in hardness value. Keyword: Flexible coupling, ductile cast iron, micro structure, hardness, tensile test, chemical compositio