Penelitian ini tentang menganalisa pengaruh overhaul terhadap efisiensi boiler
pada PLTU X, metode yang digunakan untuk mengetahui efisiensi boiler ada dua, yaitu
metode direct dan metode indirect. Analisa efisiensi boiler dilakukan perhitungan dari
performance test. Standar perhitungan yang digunakan adalah ASME PTC-4 2008.
Analisa efisiensi boiler dapat digunakan untuk mengetahui pengaruh overhaul terhadap
meningkatnya nilai efisiensi boiler yang ditunjukkan dari perbandingan panas yang
masuk (heat input), heat loss, dan boiler credit ke masuk kedalam boiler. Nilai
perhitungan sebelum overhaul dengan metode direct 3 bulan pada bulan Juli 2019 sebesar
75.198%, Agustus 2019 sebesar 74.777%, September 2019 sebesar 76.219% sedangkan
setelah overhaul pada bulan November 2019 sebesar 77.069%, Desember 2019 sebesar
77. 528%, Januari 2020 sebesar 76.298%. sedangkan perhitungan efisiensi dengan
metode indirect 3 bulan sebelum overhaul yaitu pada Juli 2019 sebesar 83.216%, Agustus
2019 sebesar 83.401%, September 2019 sebesar 83.51%, setelah overhaul pada bulan
November 2019 sebesar 83.47%, Desember 2019 sebesar 84.328%, Januari 2020 sebesar
84.1%.

This research is about analyzing the effect of overhauls on boiler efficiency in pltu X,
the method used to find out the efficiency of boilers there are two, namely direct
methods and indirect methods. Boiler efficiency analysis is carried out calculations
from performance tests. The standard calculation used is ASME PTC-4 2008. Boiler
efficiency analysis can be used to determine the effect of overhaul on the increasing
efficiency value of the boiler shown from the ratio of incoming heat (heat input), heat
loss, and boiler credit into the boiler. The calculation value before overhaul with the
direct method of 3 months in July 2019 amounted to 75.198%, August 2019 amounted
to 74.777%, September 2019 amounted to 76.219% while after overhaul in November
2019 by 77,069%, December 2019 by 77. 528%, January 2020 amounted to 76.298%.
while the calculation of efficiency with the indirect method 3 months before the
overhaul is in July 2019 by 83.216%, August 2019 by 83.401%, September 2019 by
83.51%, after the overhaul in November 2019 by 83.47%, December 2019 by 84,328%,
January 2020 by 84.1%.