scholarly journals Planning for Maintenance and Repair of Continuous Ship Unloader Using the IRRO Method

2021 ◽  
Vol 21 (1) ◽  
pp. 52-63
Author(s):  
Syamsul Hadi ◽  
◽  
Alfarizi Al Azis ◽  
Vinan Viyus ◽  
Etik Puspitasari ◽  
...  
Keyword(s):  
Bulk Material ◽  
Screw Conveyor ◽  
Repair Cost ◽  
Belt Conveyor ◽  
Material Transfer ◽  
Maintenance And Repair ◽  
Machine Maintenance ◽  
Repair Costs ◽  
Planning Methods ◽  
Life Predictions

The problem faced is damage, especially to the screw conveyor from the Continuous Ship Unloader (CSU) as a dry bulk material transfer equipment (phosphate rock) which is taken from the ship's hold which is flowed by a screw conveyor followed by the belt conveyor to the material warehouse to be processed into a type of fertilizer. The purpose of planning is to obtain a schedule and estimated cost of maintenance and repair of CSU for the period 2022 to 2025, and to obtain the ratio of maintenance-repair costs to the profit of the machine. Planning methods uses the IRRO (Inspection, Replace, Repair, and Overhoul) method include data collection of machine maintenance history and component breakdowns, checking CSU specifications, making a list of component life predictions and component prices, predicting costs and duration of component dissasembly, screw conveyor repair, maintenance and repair scheduling, and maintenance and repair cost estimates. The real results of planning in the form of a maintenance and repair schedule for the period of 2022 to 2025; maintenance and repair costs respectively for the years 2022 to 2025 are IDR 136,873,000; IDR 335,986,000; IDR 160,687,000; and IDR 464,733,000; and the ratio between maintenance costs to profit for the years 2022 to 2025 is 0.51, 1.22, 0.57, and 1.63 which means the machine is still fit for use without the need for refurbishment because it is still prospective.

On the Expected Number of Failures and Maintenance Cost Prediction of Repairable Systems From Life Cycle Cost Modeling Perspective

2010 ◽  
Author(s):  
Laxman Yadu Waghmode ◽  
Anil Dattatraya Sahasrabudhe
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Life Time ◽  
Maintenance Cost ◽  
Repairable System ◽  
Repair Cost ◽  
Repairable Systems ◽  
Expected Number ◽  
Maintenance And Repair ◽  
Repair Costs

The objective of this paper is to provide some useful insights on how cost driving events are related to the characteristics of failure distributions and the product lifetime (design life) in case of repairable systems. Repairable systems are those that can be restored to their fully operational capabilities by any method, other than the replacement of the entire system. In case of repairable systems, the components can be repaired or adjusted rather than replaced, whenever a breakdown occurs and thus such systems experience multiple failures over their life span. For majority of repairable systems, the life time maintenance and repair costs dominate the life cycle cost. To predict the maintenance and repair cost, failure data, maintenance data and repair time data is needed which is not readily available at the system design stage. When a repairable system is put into service, how many times it will fail over its life span depends on its reliability. Similarly, how fast the system is restored to its working condition when it fails (maintainability), also affect the costs incurred. Thus, the expected number of failures, time lost in restoring the system after each failure and cost per failure are important from life time maintenance cost prediction viewpoint. The expected number of failures depends upon the time to failure distribution of the system components and the after repair state of the system. In this paper, a modeling methodology is suggested for prediction of life time maintenance and repair cost of repairable systems based on expected number of failures. The repairable system lifetime is modeled using a two parameter Weibull distribution. The expected number of failures are estimated for renewal process (as-good-as-new after repair state) and minimal repair process (as-bad-as-old after repair state). The expected maintenance and repair costs are also evaluated for six different failure distributions. The technique has been illustrated through a specific application, namely an industrial pump and the results are presented.

scholarly journals Design of Belt Conveyor for Sandblasting Material Handling System

2020 ◽  
Vol 5 (1) ◽  
pp. 28
Author(s):  
Liwiryon Sudarso ◽  
Rudi Suhradi Rachmat
Keyword(s):  
Material Handling ◽  
Steel Plate ◽  
Conveyor Belt ◽  
Screw Conveyor ◽  
Transport Capacity ◽  
Capacity Design ◽  
Belt Conveyor ◽  
Material Transfer ◽  
Final Project ◽  
Main Material

<p>Screw conveyor is a material transfer equipment that is often used in various types of industries. However, the screw conveyor also has some disadvantages if it used in the blasting room serves to transport the steel grit which is the main material in the blasting process. This screw conveyor often suffers damage to the pillow block due to the inclusion of steel grit. Based on field conditions, the screw conveyor transport capacity is considered inefficient because some of the steel grit left in the gap between the screw and the curved steel plate and not get transported by screw conveyor. In order to overcome the problems, a belt conveyor is chosen to replace the screw conveyor. The method used in this final project firstly is identifying the problem of the existing screw conveyor and observing the screw conveyor data. Secondly, by using the screw conveyor data, the author makes a design of a belt conveyor as the replacement of the existing screw conveyor. As a result, the belt conveyor design has been created with a calculated capacity of 236.81 tons/hour, which is greater than the existing screw conveyor. and is designed not to be easily damaged due to the inclusion of steel grit as it happened in the screw conveyor.</p><p> </p><p>Keywords: <em>Screw Conveyor, Belt Conveyor, Steel Grit, Blasting Room, Pillow Block, Capacity, Design</em></p><p><em> </em></p>

scholarly journals RESEARCH OF THE OF BULK MATERIAL MOVEMENT PROCESS IN THE INACTIVE ZONE BETWEEN SCREW SECTIONS

2020 ◽  
Vol 60 (1) ◽  
pp. 261-268
Author(s):  
O.M. Trokhaniak ◽  
R.B. Hevko ◽  
O.L. Lyashuk ◽  
T.A. Dovbush ◽  
B.V. Pohrishchuk ◽  
...  
Keyword(s):  
Optimal Design ◽  
Bulk Material ◽  
Experimental Studies ◽  
Screw Conveyor ◽  
Technological Parameters ◽  
Movement Process ◽  
Curved Paths ◽  
Agricultural Materials

The article presents the results of theoretical and experimental studies of the process of moving bulk material in the inactive zone between hinged screw sections of a flexible screw conveyor. The influence of the gap between the edges of adjacent screw sections and the magnitude of their circular displacement on the process of continuous transportation of bulk material is presented. The results of theoretical and experimental studies are compared. This will allow choosing the optimal design, kinematic and technological parameters of the developed sectional screw working body when transporting bulk agricultural materials along curved paths, both in horizontal and inclined directions, as well as along curved paths.

scholarly journals Dynamic Behaviour of a Conveyor Belt Considering Non-Uniform Bulk Material Distribution for Speed Control

2020 ◽  
Vol 10 (13) ◽  
pp. 4436
Author(s):  
Fei Zeng ◽  
Cheng Yan ◽  
Qing Wu ◽  
Tao Wang
Keyword(s):  
Dynamic Model ◽  
High Precision ◽  
Material Flow ◽  
Laser Scanning ◽  
Bulk Material ◽  
Speed Control ◽  
Conveyor Belt ◽  
Distribution Model ◽  
Material Distribution ◽  
Belt Conveyor

For the conveyor belt, variable material flow influences the energy efficiency of the speed control technology significantly. The fluctuation of material flow on the conveyor belt will lead to the detrimental vibrations on both the belt and the conveyor while the conveyor works at certain speeds. In order to improve the model inaccuracy caused by the uniform bulk material flow assumption in the current conveyor belt model, the paper establishes a high-precision dynamic model that can consider speed control of a conveyor belt under non-uniform bulk material transportation. In this dynamic model, a non-uniform bulk material distribution model is firstly proposed based on laser scanning technology. Then, a high-precision longitudinal dynamic model is proposed to investigate the dynamic behavior of a belt conveyor. Considering the micro-units of actual load on a conveyor belt, it can well describe the transient state of the conveyor belt. These models can be used to determine the optimal speed for safety and energy conservation in operation. Experimental results are used to validate the proposed dynamic model for analyzing belt mechanical behavior under non-uniform bulk material distribution on the belt. The results show that the proposed models can be used for optimizing the operating procedures of belt conveyor systems.

Design and Development of the Enterprise Asset Management System Based on EAM

2013 ◽  
Vol 416-417 ◽  
pp. 2066-2071
Author(s):  
Guo Xiang He
Keyword(s):  
Life Cycle ◽  
Asset Management ◽  
Preventive Maintenance ◽  
Business Processes ◽  
Life Cycle Management ◽  
Maintenance And Repair ◽  
The Core ◽  
Whole Process ◽  
Repair Costs ◽  
Asset Management System

The paper describe the EAM function by proposing the main modules and major business processes, abstracting the main business processes.it implements preventive maintenance of assets, assets track, the whole process of life-cycle management based on the equipment,asset account and treat management maintenance as the core, the submission, approval,implementation of work order as main line. EAM can effectively improve the efficiency of equipment maintenance, reduce maintenance and repair costs, improve asset reliability and value.

Environmental Impact Assessment of Product Lifespan: The Role of Consumer’s Repair Behavior and Critical Components Deterioration

2016 ◽  
Author(s):  
Mostafa Sabbaghi ◽  
Sara Behdad
Keyword(s):  
Life Cycle ◽  
Environmental Impact ◽  
Environmental Impacts ◽  
Repair Cost ◽  
Laptop Computer ◽  
Repair Costs ◽  
Critical Components ◽  
The Impact ◽  
Product Lifespan

Consumers might be willing to repair their broken devices as long as the associated repair costs do not exceed an undesirable threshold. However, in many cases the technological obsolescence actuates consumers to retire old devices and replace them with new ones rather than extending the product lifecycle through repair. In this paper, we aim to investigate the impact of components’ deterioration profiles and consumers’ repair decisions on the lifespan of devices, and then assesse the anticipated life cycle environmental impacts. A Monte Carlo simulation is developed to estimate the life cycle characteristics such as the average lifespan, the number of failed components’ replacement, and the total repair cost per cycle for a laptop computer. The lifecycle characteristics estimated from simulation model further have been used in a Life Cycle Assessment (LCA) study to quantify the environmental impact associated with different design scenarios. The results reveal the impact of product design as well as consumers’ repair decisions on the product lifespan and the corresponding environmental impacts.

Carbonation of Surface Protected Concrete with Silicone Material

2014 ◽  
Vol 584-586 ◽  
pp. 883-886
Author(s):  
Hong Song Wang ◽  
Wei Wang ◽  
Rui Wang ◽  
Wen Bin Wang ◽  
Lei Li ◽  
...  
Keyword(s):  
Service Life ◽  
Surface Treatment ◽  
Steel Reinforcement ◽  
Rapid Decay ◽  
Carbonation Depth ◽  
Surface Protection ◽  
Maintenance And Repair ◽  
Repair Costs ◽  
Harmful Substances ◽  
Concrete Service

Concrete structures are exposed to carbonation that may cause rapid decay, shortening their service life and raising maintenance and repair costs. Carbonation lowers the alkalinity of the concrete depassivating the steel reinforcement. The prescriptive methodology is not a guarantee to obtain the desired service lives of 50 or 100 years. Surface treatment is commonly used to improve the resistance of concrete to carbonation. Using the silicone materials to an immersion treatment can effectively block the invasion of harmful substances,the carbonation of concretes with surface protection with silicone materials was evaluated. The results showed silicone can lower carbonation depth than the non-protected concretes. The carbonation depth will not increase significantly in the latter part of the concrete service.

Parametric Finite Element Analysis on Key Parts of the Conveyor

2011 ◽  
Vol 101-102 ◽  
pp. 755-758 ◽  
Author(s):  
Chun Sheng Yang
Keyword(s):  
Mechanical Characteristics ◽  
Bulk Material ◽  
Viscoelastic Model ◽  
Conveyor Belt ◽  
Belt Conveyor ◽  
Element Analysis ◽  
Conveyor System ◽  
Belt Conveyors ◽  
Parametric Finite Element Analysis ◽  
Research Situation

Belt conveyors are the major equipments for bulk material transportation.This paper analyses the static and dynamic behaviours of the belt, and establishes the dynamic elastic modulus. By analyzing the characteristics of the Kelvin and Maxwell viscoelastic model, the former is selected as the conveyor belt model as it can more realistically reflect the mechanical characteristics of the conveyor system. This paper introduces the development of the belt conveyor, and analyzes the current research situation at home and abroad.

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