Perancangan Feedwater Tank dan Deaerator Serta Jalur Pipa Inlet dan Outlet Pada Proyek Penambahan Kapasitas PLTGU di Bekasi, Jawa Barat

  • Ravensky Ahmad Ghiffari Politeknik Perkapalan Negeri Surabaya
  • Heroe Poernomo Politeknik Perkapalan Negeri Surabaya
  • Burniadi Moballa Politeknik Perkapalan Negeri Surabaya
Keywords: Pressure Vessel, Design, Load, Software, ASME


An Electric Steam Gas Turbine Generator in Bekasi, West Java will increase its capacity,
therefore new generation units are needed. In each generation unit required one Heat Recovery
Steam Generator(HRSG) that used to produced steam which used to turn the turbine, in each HRSG
required one Feedwater Tank and Deaerator to supply feedwater to the boiler, so it’s necessary to
design the right Feedwater Tank and Deaerator so that the Feedwater system can run without any
problems. In designing Feedwater Tank and Deaerator with SA-516 70 material, with a design
pressure of 7,5 bar and a design temperature of 29 C. The thickness of the shell and head for the
Feedwater Tank is 0,875 inche and for the deaerator is 0.5 inches. The MAWP head and shell for the
Feedwater Tank were 156.11 psi and 155.52 psi, while the MAWP head and shell for the Deaerator
were 166.53 psi and 165.84. The nozzle design on the Deaerator and Feedwater Tank varies, some
use reinforcing pads and some don't. For piping system design using materials A-106 B and A-105,
with diameters for inlet pipes varying according to their respective line numbers, for inlet pipes using
NPS 4 inch Sch 40, 12 inch Sch 20, 16 inch Sch 10, and 10 inch Sch 30. As for the outlet pipe using
NPS 10 inch Sch 40, 8 inch Sch 20 and 6 inch Sch 40. Where the calculation results of the CAESAR II
software show the sustain stress and the magnitude of the force and moment at the nozzle are still
below the permissible stress, so the piping system can be declared safe for operations.