Kebocoran gas pada Expansion Joint dapat terdeteksi
dengan dilakukannya predictive maintenance yaitu dengan
menggunakan metode Thermography.
Dalam penelitian ini objek yang digunakan adalah
Expansion joint no. 5 pada HRSG unit 3.1 di PT. PJB UP
GRESIK., penelitian dimulai dengan observasi data dan studi
beberapa literature terkait, dilanjutkan dengan mentoring
bersama teknisi predictive maintenance, kemudian dilakukan
pengambilan gambar actual serta gambar thermography sesuai
dengan SOP (Standard Operational Procedure). Pengambilan
gambar inframerah dilakukan dengan menggunakan kamera
inframerah FLIR T640. Setelah dilakukan pengambilan gambar
maka dilakukan analisa dari gambar thermography yang didapat
berdasarkan standart EPRI (Electric Power Research Institute).
Dari hasil penelitian didapatkan bahwa kebocoran
expansion joint diakibatkan oleh adanya 3 hal yaitu expansi
thermal yang berlebihan, masuknya exhaust gas dari turbin gas
kedalam lapisan dalam hingga ke lapisan terluar expansion joint
dan pemakaian yang melebihi lifetime expansion joint. Setelah
dilakukan perawatan dengan penggantian expansion joint,
temperatur expansion joint pada saat mengalami kebocoran
adalah 196.2OC menurun menjadi 72.5OC serta differential
temperatur yang sebelumnya critical yaitu 128.5OC turun menjadi
temperatur normal yaitu 4.8OC
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The leakage of the expansion joint can be detected by
thermography method of predictive maintenance
In this research, the object which used is Expansion joint
no. 5 on HRSG 3.1 unit at PT. PJB UP GRESIK. The research
started from collecting some data at PT. PJB UP GRESIK, and
study some literature, continued by mentoring with the technician
of predictive maintenance, and then captured some actual picture
with some thermography picture based on the SOP (Standard
Operating Procedure). The picture was taken by using the FLIR
T640 infrared camera. The result from the picture that have been
taken will be analyzed based on the standard table of EPRI
(Electric Power Research Institute).
From the research, leakage of the expansion joint are
caused by an over thermal expansion, the exhaust gas from gas
turbine enter the inner layer to the outer layer of expansion joint
and the used of expansion joint that exceeds its lifetime. After
maintenance with replacement of expansion joint, the temperature
when the expansion joint leaked is 196.2OC decreased to 72.5OC
and the differential temperature when the status was critical is
128.5OC decreased to a normal temperature that is 4.8O
