Specification for rubber hoses for low-pressure and medium-pressure saturated steam

1986 ◽  
Keyword(s):  
Low Pressure ◽  
Saturated Steam ◽  
Medium Pressure

scholarly journals ANALISIS KERUSAKAN DAN PERBAIKAN OIL PUMP STEAM TURBINE 32-K-101-P1-T DALAM PLATFORMING UNIT-NAPHTA PROCESSING UNIT (NPU)

ROTASI ◽  
2016 ◽  
Vol 18 (2) ◽  
pp. 44
Author(s):  
Norman Iskandar ◽  
Ardha Ridho Pangeran
Keyword(s):  
Steam Turbine ◽  
Ball Bearing ◽  
Low Pressure ◽  
Processing Unit ◽  
Medium Pressure ◽  
Oil Pump ◽  
Carbon Ring ◽  
Pressure Steam ◽  
Split Face

Oil pump steam turbine (OPST) adalah sebuah turbin uap jenis impuls yang digerakan oleh medium pressure steam (MPS) dengan tekanan 15–21 kg/cm2G dan temperatur kerja 250–370 oC. Uap ekstrasi dari turbin uap adalah low pressure steam (LPS) dengan tekanan 3.8–6.3 kg/ cm2G. Dalam proses perawatannya, OPST diinspeksi setiap 2 minggu sekali dengan melihat kondisi oli, trending getaran, dan putaran poros turbin. Pada saat operasi OPST mengalami kenaikan vibrasi yang melebihi batas toleransi (vs 2.82 mm/s) dan keruhnya oli pelumasan OPST. Dalam hal ini dilakukan sebuah penelitian guna mengetahui indikasi kerusakan OPST dan analisis perbaikan yang tepat guna mengembalikan performa dari OPST. Dalam mengidentifikasi kerusakan tersebut metode yang dilakukan adalah analisis trending spektrum menggunakan software omnitrend yang nilainya akan dibandingkan dengan hasil perhitungan bearing. Analisis tersebut menghasilkan bahwa terjadi vibrasi 1X RPM dikarenakan kerusakan pada ball bearing yang diakibatkan oleh pelumas bearing yang sudah keruh karena tercampur air. Untuk mengetahui masuknya air ke dalam oil chamber dilakukan dua cara yaitu percobaan hydrotest dan pengukuran clearances carbon ring seals. Setelah dilakukan dua percobaan tersebut didapatkan hasil penyebab masuknya air ke oil chamber karena overclearances pada carbon ring seals (vs 0.120-0.145 mm). Masalah yang terjadi ini mengakibatkan uap masuk ke penampungan oli sehingga pelumasan pada bearing tidak berjalan dengan baik sehingga terjadi kerusakan pada bearing. Setelah teridentifikasi kerusakannya, dilakukan pergantian komponen bearing inboard dan bearing outboard serta laping split face pada carbon ring seals. Setelah mengalami perbaikan vibrasi pada OPST kembali normal dari 3.72 mm/s menjadi 0.93 mm/s.

Thermodynamic evaluation of an ORC system with a Low Pressure Saturated Steam heat source

Energy ◽  
2018 ◽  
Vol 149 ◽  
pp. 375-385 ◽  
Author(s):  
Dabiao Wang ◽  
Yuezheng Ma ◽  
Ran Tian ◽  
Jie Duan ◽  
Busong Hu ◽  
...  
Keyword(s):  
Heat Source ◽  
Low Pressure ◽  
Saturated Steam ◽  
Thermodynamic Evaluation ◽  
Steam Heat

scholarly journals Molecular Indications of Protein Damage in Adenoviruses after UV Disinfection

2010 ◽  
Vol 77 (3) ◽  
pp. 1145-1147 ◽  
Author(s):  
Anne C. Eischeid ◽  
Karl G. Linden
Keyword(s):  
Cell Culture ◽  
Viral Proteins ◽  
Low Pressure ◽  
Protein Damage ◽  
Uv Disinfection ◽  
Medium Pressure ◽  
The Difference ◽  
Uv Lamp ◽  
Detailed Work

ABSTRACTAdenoviruses are resistant to monochromatic, low-pressure (LP) UV disinfection—but have been shown to be susceptible to inactivation by polychromatic, medium-pressure (MP) UV—when assayed using cell culture infectivity. One possible explanation for the difference between UV lamp types is that the additional UV wavelengths emitted by MP UV enable it to cause greater damage to viral proteins than LP UV. The objective of this study was to examine protein damage in adenoviruses treated with LP and MP UV. Results show that MP UV is more effective at damaging viral proteins at high UV doses, though LP UV caused some damage as well. To our knowledge, this study is the first to investigate protein damage in UV-treated adenovirus, and the overview presented here is expected to provide a basis for further, more detailed work.

Simulation and Optimization of the Nozzle of Low Pressure Saturated Steam Turbine

2013 ◽  
Vol 341-342 ◽  
pp. 387-390
Author(s):  
Bing Cheng Liu ◽  
Chun Xiao Wang ◽  
De Biao Zhou ◽  
Chang Xin Jin
Keyword(s):  
Steam Turbine ◽  
Low Pressure ◽  
Steam Flow ◽  
Saturated Steam ◽  
Simulation And Optimization ◽  
New Type ◽  
Turbine Design

Nozzle plays an important role in steam turbine design and operation. With the purpose of design a new type low pressure saturated steam turbine, in this paper the model of steam flow inner nozzle was simulated, and the influences of tip angle, expansion section length and throat length on the efficiency of the nozzle were analyzed. Furthermore, the structure and parameter of nozzle were optimized.

Comparison of Low Pressure and Medium Pressure UV Lamps for UV/H2O2Treatment of Natural Waters Containing Micro Pollutants

2010 ◽  
Vol 32 (5) ◽  
pp. 329-337 ◽  
Author(s):  
Guus F. IJpelaar ◽  
Danny J.H. Harmsen ◽  
Erwin F. Beerendonk ◽  
Robin C. van Leerdam ◽  
Debbie H. Metz ◽  
...  
Keyword(s):  
Natural Waters ◽  
Low Pressure ◽  
Medium Pressure ◽  
Uv Lamps ◽  
Micro Pollutants

scholarly journals Effects of UV Radiation on Photolyase and Implications with Regards to Photoreactivation following Low- and Medium-Pressure UV Disinfection

2007 ◽  
Vol 74 (1) ◽  
pp. 327-328 ◽  
Author(s):  
Jiangyong Hu ◽  
Puay Hoon Quek
Keyword(s):  
Uv Radiation ◽  
Uv Irradiation ◽  
Flavin Adenine Dinucleotide ◽  
Low Pressure ◽  
Uv Disinfection ◽  
Medium Pressure ◽  
Uv Lamps

ABSTRACT Photolyase activity following exposure to low-pressure (LP) and medium-pressure (MP) UV lamps was evaluated. MP UV irradiation resulted in a greater reduction in photolyase activity than LP UV radiation. The results suggest that oxidation of the flavin adenine dinucleotide in photolyase may have caused the decrease in activity.

scholarly journals NOM (HA and FA) Reduction in Water Using Nano Titanium Dioxide Photocatalysts (P25 and P90) and Membranes

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 249
Author(s):  
Mariola Rajca
Keyword(s):  
Titanium Dioxide ◽  
Membrane Fouling ◽  
Active Surface ◽  
Fulvic Acids ◽  
Low Pressure ◽  
Organic Substances ◽  
Permeate Flux ◽  
Medium Pressure ◽  
Surface Areas ◽  
Nano Titanium Dioxide

This study examined the removal of natural organic substances (humic acids-HA, and fulvic acids-FA) from model solutions using photocatalysis and ultrafiltration. The effect of two nano titanium dioxide types (P25 and P90) with different active surface areas and two UV lamps (low-pressure and medium-pressure) on the effectiveness of FA and HA removal during photocatalysis was tested. An integrated photocatalytic + ultrafiltration system was also analyzed to determine the effectiveness of FA and HA removal and the changes in the relative permeate flux (Ultrafiltration Membrane Fouling-UF). We observed that photocatalysis using the P90 nano titanium dioxide was more efficient than the P25 due to the larger surface area (2×). The decomposition of organic substances proceeded efficiently up to 30 min of solution exposure, and the use of a medium-pressure lamp accelerated compound decomposition relative to the low-pressure lamp. The applied photocatalysis + ultrafiltration system was characterized by a high degree of FA removal while improved hydraulic efficiency was observed during ultrafiltration.

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