scholarly journals REMAINING LIFE ASSESSMENT DAN KASUS LAJU KOROSI PADA LPG STORAGE TANK KAPASITAS 50 TON

2020 ◽  
Vol 1 (2) ◽  
pp. 96-106
Author(s):  
Amam Fachrur Rozie
Keyword(s):  
Pressure Vessel ◽  
Storage Tank ◽  
Life Assessment ◽  
Remaining Life ◽  
Non Destructive Testing ◽  
Visual Examination ◽  
Destructive Testing ◽  
Working Pressure ◽  
Remaining Life Assessment ◽  
Non Destructive

LPG Storage Tank berkapasitas 50 Ton yang telah terinstalasi dan beroperasi sejak tahun 2010 akan dikaji kelayakan dan sisa umur pakai dari pressure vessel tersebut. Metode pengujian yang dipergunakan adalah Non-Destructive Testing (NDT) - Ultrasonic Testing (UT) pada bagian shell dan head untuk mendapatkan nilai actual thickness dari pressure vessel serta dilakukan Visual Examination. Nilai thickness tersebut dipergunakan untuk menganalisis dan mengkalkulasi thickness required (Treq), nilai Corrosion Rate (CR), Maximum Allowable Working Pressure (MAWP) serta umur sisa (Remaining Life) dari LPG Storage Tank tersebut. Dari hasil analisa serta perhitungan maka didapat umur sisa pakai dari LPG Storage Tank kapasitas 50 Ton adalah 18 tahun dengan nilai laju korosi sebesar 0,043 mm/thn

scholarly journals Towards optimised and reconstructable sampling inspection of pipe integrity for improved efficiency of non-destructive testing

2017 ◽  
Vol 18 (2) ◽  
pp. 515-523 ◽  
Author(s):  
Lei Shi ◽  
Jaime Valls Miro
Keyword(s):  
Risk Estimation ◽  
Life Assessment ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Sampling Inspection ◽  
Cost Efficiencies ◽  
Residual Part ◽  
Equivalent Measure ◽  
Remaining Life Assessment ◽  
Non Destructive

Abstract This work proposes a sampling inspection framework for point measurement non-destructive testing of pipelines to improve its time and cost efficiencies. Remaining pipe wall thickness data from limited dense inspection are modelled with spatial statistics approaches. The spatial dependence in the available data and some subjective requirements provide a reference for selecting a most efficient sampling inspection scheme. With the learned model and the selected sampling scheme, the effort of inspecting the residual part of the same pipeline or cohort will be significantly reduced from dense inspection to sampling inspection, and the full information can be reconstructed from samples while maintaining a reasonable accuracy. The recovered thickness map can be used as an equivalent measure to the dense inspection for subsequent structural analysis for failure risk estimation or remaining life assessment.

Remaining Life Assessment of an External Pressure Vessel in Creep Range and Inspection Findings

2017 ◽  
Author(s):  
Yoichi Ishizaki ◽  
Futoshi Yonekawa ◽  
Takeaki Yumoto ◽  
Teppei Suzuki ◽  
Shuji Hijikawa
Keyword(s):  
Pressure Vessel ◽  
Creep Damage ◽  
External Pressure ◽  
Pressure Vessels ◽  
Life Assessment ◽  
Remaining Life ◽  
Assessment Technique ◽  
Creep Cavity ◽  
Creep Analysis ◽  
Remaining Life Assessment

As widely recognized in the industry, it is important to evaluate the creep damage of an elevated temperature vessel so that the mechanical integrity of the vessel can be achieved through the adequate repair and replacement planning. This is quite straight forward procedure for internal pressure vessels. For an external pressure vessel, it is not easy to assess the creep damage due to the complexity of the creep buckling analysis. Eventually, creep cavity evaluation technique without identifying the correct stress distribution has been used so often. However, due to the uncertainty of the technique itself plus conservative mindset of the inspectors, it tends to leads to an excessive maintenance most of the cases. In order to conduct a reasonable remaining life assessment, it is desirable to use the creep cavity inspection in conjunction with another assessment technique such as FEM creep analysis as stated in API 579-1/ASME FFS-1 10.5.7. In this paper, comprehensive approach with FEM and field inspection such as creep cavity evaluation to reinforce the uncertainty of each method will be demonstrated.

scholarly journals 120 PENERAPAN STANDAR UJI TANPA MERUSAK UNTUK MENENTUKAN SISA UMUR PIPA KETEL UAP PADA UNIT PEMBANGKIT LISTRIK TENAGA UAP

2008 ◽  
Vol 8 (3) ◽  
pp. 120
Author(s):  
Supriadi Supriadi
Keyword(s):  
Hardness Test ◽  
Thickness Measurement ◽  
Test Methods ◽  
Life Assessment ◽  
Remaining Life ◽  
Boiler Tube ◽  
Destructive Test ◽  
Electrical Generator ◽  
Remaining Life Assessment ◽  
Non Destructive

<p>Application of standard for remaining life assessment at boiler tube of steam powered electrical generator unit by<br />non-destructive test (NDT), up to now has been very important. The condition of boiler tube used in electrical<br />generator in Indonesia has reached its design limit and even some of them have replaced. This research used nondestructive<br />test methods by SNI, JIS and API standard and was conducted at boiler unit II in Indonesia, that has<br />already in 25 years operated. This method consists of several technique approaches that are: replica methods<br />(microstructure), hardness test, outside diameter measurement (OD), and wall thickness measurement. After<br />assessment and analysis, the results of non destructive test methods showed that the remaining life of boiler tube<br />is 100.000 to 120.000 operation hours.</p>

scholarly journals Non-destructive Testing Robots (NDTBOTs) for In-Service Storage Tank Inspection

2018 ◽  
Vol 8 (3) ◽  
Author(s):  
Richard Anvo ◽  
Tariq P. Sattar ◽  
Tat-Hean Gan ◽  
Ivan Pinson
Keyword(s):  
Storage Tank ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

scholarly journals NON-DESTRUCTIVE TESTING ROBOTS (NDTBOTS) FOR IN-SERVICE STORAGE TANK INSPECTION

2017 ◽  
Author(s):  
RICHARD ANVO ◽  
TARIQ P. SATTAR ◽  
TAT-HEAN GAN ◽  
IVAN PINSON
Keyword(s):  
Storage Tank ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Non-destructive testing derived parameters for microstructure-based residual service life assessment of aging metallic materials in nuclear engineering

2019 ◽  
Vol 61 (11) ◽  
pp. 1029-1038 ◽  
Author(s):  
Ruth Acosta ◽  
Christian Boller ◽  
Peter Starke ◽  
Michael Jamrozy ◽  
Marina Knyazeva ◽  
...  
Keyword(s):  
Service Life ◽  
Life Assessment ◽  
Residual Service Life ◽  
Metallic Materials ◽  
Nuclear Engineering ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Residual Service

scholarly journals Understanding the Structural Audit Building

2021 ◽  
Author(s):  
Atul Sutar ◽  
Anil Babar
Keyword(s):  
Environmental Effects ◽  
Core Sample ◽  
Non Destructive Testing ◽  
Visual Examination ◽  
Destructive Testing ◽  
And Performance ◽  
Maintenance And Inspection ◽  
Non Destructive

This paper examines many aspects of structural auditing, including visual examination, non-destructive testing, core sample, and testing. It also emphasises various building repairs and retrofitting procedures that should be employed after a structural audit. As the structure matures, it need frequent maintenance and inspection in order to avoid further damage. The health and performance of a building are dependent on its maintenance quality. In order to protect the structure from environmental effects, it should be monitored on a regular basis by a professional. As a result, a structure audit is performed to assess the overall health of the building. A structure audit is a preliminary technical survey performed on a structure to recommend repair solutions.

Generator Retaining Rings: In Situ Inspection and Life Assessment

2009 ◽  
Author(s):  
Jan Willem Noteboom
Keyword(s):  
Life Assessment ◽  
Inspection System ◽  
Non Destructive Testing ◽  
Detection Capability ◽  
Destructive Testing ◽  
New Developments ◽  
Retaining Ring ◽  
The Common ◽  
Non Destructive

Stress corrosion cracking (SCC) in retaining rings of generators has been a major issue since large generator manufactures started to advise generator owners to replace and inspect retaining rings made from certain materials in the mid 1990’s. KEMA has been inspecting generator retaining rings with automated systems from the seventies on. Since 1995 new developments led to the possibility of also testing rings in situ, eliminating the need of removing the rotor from the stator and thus saving considerable down-time. Over the years, step by step improvements to the system and its application to generator retaining ring inspections have been implemented, one of which is the use of smaller probes and manipulators. Another improvement is the implementation of eddy current testing (ECT) to increase the detection capability for cracking at the outside surface in parallel to the automated ultrasonic testing (AUT). Experience obtained with this method contradicts some of the common ideas about reliability of other Non-destructive testing (NDT) methods, in particular the application of Dye Penetrant inspection (DPI) which appears to be less reliable. By performing fracture mechanics calculations to evaluate detected and sized flaw indications, predictions of remaining life of the rings can be made (Fitness-for-Purpose analysis). This paper presents results of applying the in situ retaining ring inspection system in the last 14 years and gives an overview of cases — some of those from recent inspections — where defect indications were detected, sized and evaluated. In some cases this resulted in recommendations to replace the retaining rings.

scholarly journals Structural health monitoring of liquid filled above ground storage tank floors: a time-reversed approach to acoustic emission source location

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Boris Adolfo Zárate-Hernández
Keyword(s):  
Acoustic Emission ◽  
Storage Tank ◽  
Numerical Data ◽  
Source Location ◽  
Ray Theory ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Location Algorithm ◽  
Point Of Intersection ◽  
Non Destructive

Acoustic Emission (AE) is a proven successful Non-Destructive Testing (NDT) method to assess the state of storage tank floors. Traditional AE source location in tanks floors is performed using only the wavefronts that have traveled directly from the source to the sensor (direct hit). The wavefronts captured after reflected from the tank walls are identified and discarded. This paper proposes a new AE source location algorithm in tanks that considers a combination of reflections and direct hits. The proposed algorithm is based on time-reversed acoustics and ray theory. The methodology uses the concept of time-reversed acoustics in which a wave detected at any location can be directed back to the source when re-created at the detection place. Therefore, the developed approach takes the time at which each wave arrives to the sensor and sends it back as if time had reversed. Ray theory is used in the methodology to account for the way in which the wavefront is reflected when encounters an obstacle such as the walls of the tank. Then, the point of intersection of all wavefronts is identified using an optimization algorithm. This point where all wavefronts intersect is considered the location of the source. The location algorithm considers the first path or direct hits from the source to the sensors combined with reflections obtained by wavefronts bouncing from the tank walls. The proposed location algorithm was validated using numerical data from 176ft diameter tank and experimentally using AE data from a tank 55ft diameter.

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