Analisa Kerusakan Pipa High Pressure Economizer Pada Heat Recovery Steam Generator Pembangkit Listrik Muara Tawar Blok 5

Susanto, Hendra Gunawan (2021) Analisa Kerusakan Pipa High Pressure Economizer Pada Heat Recovery Steam Generator Pembangkit Listrik Muara Tawar Blok 5. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebocoran pipa high-pressure economizer pada Heat Recovery Steam Generator (HRSG) yang terletak pada inlet header terjadi pada bulan Mei 2020 di unit pembangkit listrik Muara Tawar Blok 5, Bekasi, Jawa Barat, Indonesia. Analisa kerusakan pada kebocoran pipa dilakukan dengan investigasi karakteristik feed water, pengecekan visual pada area kerusakan, dan analisa laboratorium pada potongan pipa yang bocor. Sebelum terjadi kerusakan ditemukan bahwa nilai dissolved oxygen pada pencatatan data feed water mengalami kenaikan mencapai 34.6 ppb dimana nilai standardnya adalah < 7 ppb. Nilai pH pada feed water juga mencatat nilai terendah 8.82 dimana nilai standard seharusnya diatas 9. Hasil pemeriksaan visual menunjukkan posisi kebocoran pada area dekat inlet header. Hasil uji laboratorium mengindikasikan terjadinya scalloping dan penipisan material pipa pada area dekat dengan inlet header pipa dimana secara umum disebabkan oleh adanya aliran turbulen yang dikonfirmasi melalui simulasi dengan ANSYS. Penipisan pipa juga dipercepat dengan terlarutnya magnetit pada area scalloped. Terbentuknya magnetit ini erat hubungannya dengan material pipa ASTM SA210 yang memiliki kandungan kromium yang rendah sehingga sangat rentan terhadap pembentukan porous magnetite. Proses pelepasan magnetit yang berulang sehingga menyebabkan penipisan dan scalloped area adalah ciri khas dari mekanisme kerusakan akibat flow accelerated corrosion (FAC).
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A tube leakage at the proximity of inlet header tube of the high-pressure economizer of Heat Recovery Steam Generator (HRSG) was detected in May 2020 in Muara Tawar Power Plant Blok 5, Bekasi, West Java, Indonesia. Failure analysis of the leakage tubes was carried out by investigating the feed water properties, visual examination of the damaged area, and laboratory analysis of sectioned tube failures. It was found that before the failure occurs, the feedwater data recorded a sharp rise of dissolved oxygen to 34.6 ppb, considering the requirement has to be < 7 ppb. The pH of the feed water also records the lowest value of 8.82, while the standard should always be higher than 9. The visual inspection result shows the position of the leak in the area near the inlet header. The laboratory examination indicates inner tube scalloping and thinning at the proximity of the header tube, which is caused mainly by turbulent flow as confirmed by computer simulation using ANYSY. The thining of the tube was also accelerated as magnetite was removed from the scalloped region. The formation of magnetite related to the ASTM SA210 pipe material that has a low chromium content is highly susceptible to the formation of porous magnetite. Repeated magnetite dissolution processes causing thinned and scalloped areas are characteristic of the damage mechanism due to Flow Accelerated Corrosion (FAC).

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Heat Recovery Steam Generator, High-pressure economizer, Flow Accelerated Corrosion (FAC), Heat Recovery Steam Generator, High pressure economizer, Flow Accelerated Corrosion (FAC)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	HENDRA GUNAWAN SUSANTO
Date Deposited:	24 Aug 2021 03:57
Last Modified:	25 Aug 2021 08:29
URI:	http://repository.its.ac.id/id/eprint/89846

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