Risk analysis in maintenance processes
Przemysław Drożyner
University of Warmia and Mazury in OlsztynPoland
Orcid profileSearch for this author on
Dec 31, 2020
About this article
Published Online: Dec 31, 2020
Page range: 64 - 76
Received: May 05, 2020
Accepted: Nov 15, 2020
DOI: https://doi.org/10.2478/emj-2020-0028
Keywords
© 2020 Przemysław Drożyner, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Descriptions and comparison of the adopted damage category
| A | damage for which the total share in a given criterion is 80% | severe and chronic damage | damage with an unacceptable risk |
Risk analysis tools used for maintenance
| ETA | Event Tree Analysis — a method for describing the consequences of the superior event, illustrating the progression of events from the initial event to the final event, with particular emphasis on the moments that are decisive for the condition of the facility (installation). It is the primary method of creating an object model for threat analysis | |
| FTA | Fault Tree Analysis — a qualitative method of risk analysis using the structure of logical trees, allowing for modelling the course of a failure and then its analysis. An FTA diagram illustrates causes, the result of which are referred to as uncertain events or risk | |
| FMEA | Failure Modes Effects Analysis — a method that consists of analytically determining the cause-and-effect relationships of potential product defects and considering the criticality (risk) factor in the analysis. Its aim is to consistently and systematically identify potential product/process defects, and then eliminate them or minimise the related risk | |
| HAZOP | Hazard and Operability Studies, in other words, the analysis of threats and operational capabilities, is based on the PN-IEC 61882 standard. It is often used in the design of new facilities and installations, modernisation of facilities, installations or processes | |
| HIRA | Hazard Identification and Risk Assessment — risk assessment tool that can be used to assess which hazards pose the greatest risk in terms of how likely they are to occur and how great their potential impact may be | |
| GOFA | Goal-Oriented Failure — analysis and a hazard identification technique that uses selective features from Failure Mode and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) to identify the causes of failure of a specific target | |
| RBI | Risk-Based Inspection — determining the scope and methods of testing, allowing to determine the risk associated with the operation of technical devices, based on the results of quantitative risk analysis | |
| RCM | Reliability-Centred Maintenance — determining the necessary maintenance activities in the operational efficiency of the machine or device, considering the conditions of use |
List of the frequency and duration of emergency downtime at the enterprise
| horizontal tank | 7 | hori | 35 | 5 | 70 | 2 |
| submersible pump | 20 | subm | 40 | 2 | 40 | 1 |
| washing station | 2 | wash | 8 | 4 | 24 | 3 |
| condensing unit | 1 | cond | 5 | 5 | 15 | 3 |
| water boiler | 1 | wate-b | 5 | 5 | 10 | 2 |
| shrink wrapping machine | 1 | shri | 3 | 3 | 9 | 3 |
| pneumatic pump for cheese | 1 | pneu | 3 | 3 | 9 | 3 |
| centrifuge LWG-47 | 1 | cent | 3 | 3 | 9 | 3 |
| pneumatic press of cheeses | 1 | pneu1 | 4 | 4 | 8 | 2 |
| milk collection station | 1 | milk | 4 | 4 | 8 | 2 |
| cheese cauldron | 1 | chee-c | 3 | 3 | 6 | 2 |
| vacuum packing machine | 1 | vacu | 3 | 3 | 6 | 2 |
| cheese slurry pump | 1 | chee-s | 3 | 3 | 6 | 2 |
| hot water pump | 3 | hot | 3 | 1 | 6 | 2 |
| water cooler | 1 | wate-c | 2 | 2 | 6 | 3 |
| pasteuriser - milk - cream | 1 | past | 4 | 4 | 4 | 1 |
| centrifugal pump | 1 | centp | 2 | 2 | 2 | 1 |
| screw compressor | 1 | scre | 1 | 1 | 2 | 2 |
| elevator | 1 | elev | 1 | 1 | 1 | 1 |
| together | 132 | 58 | 241 | 40 |
Summary of the analysis results for variant V1
| A | washing station, condensing unit, shrink wrapping machine, pneumatic press of cheeses, centrifuge LWG-47, water cooler, horizontal tank, water boiler, pneumatic pump for cheese, milk collection station, cheese cauldron, vacuum packing machine, cheese cauldron | horizontal tank, condensing unit, water boiler, washing station, pneumatic press of cheeses, shrink wrapping machine, pneumatic pump for cheese, centrifuge LWG-47, cheese cauldron, vacuum packing machine | shrink wrapping machine, centrifuge LWG-47, pneumatic press of cheeses, washing station, condensing unit, cheese slurry pump, cheese cauldron, vacuum packing machine, pneumatic pump for cheese, milk collection station, water boiler, horizontal tank | pasteuriser - milk – cream, pneumatic pump for cheese, washing station, milk collection station, condensing unit, horizontal tank, water boiler, |
| number of devices | 13 | 10 | 12 | 7 |
Summary of the analysis results for variant V2
| A | horizontal tank, submersible pump, washing station, condensing unit, water boiler, shrink wrapping machine, pneumatic pump for cheese, centrifuge LWG-47 | submersible pump, horizontal tank, washing station, condensing unit, water boiler, pneumatic pump for cheese, milk collection station, pasteuriser - milk - cream | horizontal tank, submersible pump, washing station | horizontal tank, submersible pump |
| number of devices | 8 | 8 | 3 | 2 |