A method for obtaining the preventive maintenance interval
in the absence of failure time data
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Online publication date: 2022-07-02
Publication date: 2022-07-02
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(3):564-573
HIGHLIGHTS
- A new method to find the preventive interval optimizes the asset's costs and incomes.
- This method contains low mathematical complexity and rapid execution.
- The Weibull distribution and a semi-Markovian model are used to compute the returns.
- Use of failure data when the time values for such failures are unknown.
- Apply to those assets that do not have an instrument that measures the operating hours.
KEYWORDS
ABSTRACT
One of the ways to reduce greenhouse gas emissions and other polluting gases caused by
ships is to improve their maintenance operations through their life cycle. The maintenance
manager usually does not modify the preventive intervals that the equipment manufacturer
has designed to reduce the failure. Conditions of use and maintenance often change from design conditions. In these cases, continuing using the manufacturer's preventive intervals can
lead to non-optimal management situations. This article proposes a new method to calculate
the preventive interval when the hours of failure of the assets are unavailable. Two scenarios
were created to test the effectiveness and usefulness of this new method, one without the
failure hours and the other with the failure hours corresponding to a bypass valve installed in
the engine of a maritime transport surveillance vessel. In an easy and fast way, the proposed
method allows the maintenance manager to calculate the preventive interval of equipment
that does not have installed an instrument for measuring operating hours installed.
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