ANALISA KERUSAKAN PIPA AIR PENGUMPAN BOILER

Abstrak: Pipa air pengumpan boiler adalah suatu sistem pengumpan air ke boiler. Untuk pelindungan dari serangan korosi pada pipa disuntikkan inhibitor. Kerusakan terjadi  pada pipadi ujung pipa injeksi  inhibitor setelah 7 tahun operasi. Lokasi pipa inhibitor adalah 800 mm setelah swing check valve. Untuk mencari akar penyebab dilakukan analisa kerusakan. Untuk mendukung analisa kerusakan dilakukan pengujian dan pemeriksaan komposisi kimia, fraktografi, metalografi, kekerasan, produk korosi, polarisasi, simulasi aliran dan rasio Na dan PO4 dalam inhibitor. Hasil pemeriksaan komposisi kimia menunjukkan bahwa material pipa adalah sesuai standar. Hasil pemeriksaan fraktografi menunjukkan kerusakan berupa penipisan lokal berbentuk cekungan sepatu kuda. Hasil pemeriksaan metalografi menunjukkan struktur mikro material pipa adalah ferit dan perlit normal. Hasil pemeriksaan produk korosi menunjukkan kandungan oksigen yang sangat tinggi. Hasil pengujian polarisansi dengan inhibitor adalah 19,991 mpy. Hasil simulasi aliran menunjukkan di lokasi pipa injeksi inhibitor adalah zona aliran diam. Hasil pemeriksaan kandungan inhibitor menunjukkan bahwa rasio Na dan PO4 dibawah 2,85:1. Dari hasil pemeriksaan dan pengujian tersebut dapat dikerucutkan bahwa akar penyebab kerusakan pipa air pengumpan boiler adalah serangan korosi akibat konsentrasi oksigen.Kata kunci: Pipa Air Pengumpan Boiler, Baja Karbon, Inhibitor, Aliran Diam, Caustic Gouging, Konsentrasi Oksigen

Designing and Building Client-Server Based Student Admission Applications

Admission of New Students is a routine activity organized by the Educational Institution. Early Childhood Education (PAUD) is included in out-of-school education in the age range of two to five years, the goal is to help improve physical and spiritual growth and development so that children have the readiness to enter further education. Admission of New Students to Al-Qudwah is still done using prospective students visiting Al-Qudwah and filling out the registration form with paper. New Student Admission Application at Al Quwah aims to promote the school to the community at large and can also be registered without parents of prospective students visiting educational institutions. This application makes it easy for parents of prospective students to find out the facilities and infrastructure and the information available on Al Quwah. We built this application using HTML and PHP programming languages with the PHP MySQL database and using the waterfall method

Designing and Building Client-Server Based Student Admission Applications

Admission of New Students is a routine activity organized by the Educational Institution. Early Childhood Education (PAUD) is included in out-of-school education in the age range of two to five years, the goal is to help improve physical and spiritual growth and development so that children have the readiness to enter further education. Admission of New Students to Al-Qudwah is still done using prospective students visiting Al-Qudwah and filling out the registration form with paper. New Student Admission Application at Al Quwah aims to promote the school to the community at large and can also be registered without parents of prospective students visiting educational institutions. This application makes it easy for parents of prospective students to find out the facilities and infrastructure and the information available on Al Quwah. We built this application using HTML and PHP programming languages with the PHP MySQL database and using the waterfall method