Analisa Kerusakan Pipa Boiler Super Kritikal

Mochamad Nanchy Chudhoifah, Dwita Suastiyanti, Pathya Rupajati

Abstract


Abstrak

Boiler adalah alat yang digunakan untuk mengubah air menjadi uap dengan cara dipanaskan menggunakan batubara sebagai bahan bakar utama. Pada pembangkit listrik tenaga uap dengan menggunakan boiler super critical berkapasitas 660 MW, temperatur uap 566 °C dan tekanan 240 bar memiliki pipa di area final superheater dengan jenis material SA213 – T91. Pada saat unit start up, pipa di area final superheater mengalami kebocoran sehingga pipa menjadi pecah. Pecahnya pipa menyerupai mulut ikan, hasil analisa penyebabnya kemungkinan karena Short Term Temperature. Melalui uji metalografi ditemukan adanya rongga-rongga dan retak pada struktur mikro, kemungkinan karena pengelupasan lapisan magnetik didalam pipa. Untuk itu pengoperasian boiler harus memperhatikan kenaikan metal temperatur tidak boleh melebihi 2°C/menit agar tidak terjadi pengelupasan lapisan magnetik pada pipa Boiler.

Kata kunci: SA213-T91, retak, superheater.

Abstract

Boilers are tools used to convert water into steam by heating using coal as the main fuel. In steam power plants using super critical boilers with a capacity of 660 MW, steam temperatures of 566 ° C and pressure of 240 bar have pipes in superheater final area with material type SA213 - T91. When start of the unit, the pipe in the final superheater area has leaked so that the pipe was rupture. The rupture of a pipe like a fish's mouth, the results of the analysis cause may be due to Short Term Temperature. Through metallographic tests it was found that there were cavities and creeps on the microstructure, possibly due to the peeling of the magnetic layer in the pipe. For this reason, the operation of the boiler must pay attention to the increase in metal temperature should not exceed 2 ° C / minute so there is no exfoliation of the magnetic layer in the Boiler pipe.

Keywords: SA213-T91, creep, superheater.


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DOI: http://dx.doi.org/10.31543/jtm.v4i1.334

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