*Maintenance Decision Method Based on Risk Level DOI: http://dx.doi.org/10.5772/intechopen.91913*


**Table 5.** *Scoring criteria of FF.*


**Table 6.** *Scoring criteria of PL.*

*2.1.3 Influence of failure on system function (SF)*

**Table 3.**

**Table 4.**

**334**

*Scoring criteria of SF.*

*Scoring criteria of EH.*

established, as shown in **Table 4**.

*2.1.4 Influence of failure frequency (FF)*

specific scoring criteria are shown in **Table 5**.

The SF index mainly considers the impact of object failure on the entire production system or the function of mechanical equipment. In order to ensure con-

**Serial number Pollution degree Grading** No pollution 0 Slight pollution 1–3 Local pollution 4–7 Severe pollution 8–9 Major pollution 10

*Operations Management - Emerging Trend in the Digital Era*

**Serial number Influence level Grading**

 Total loss of system function 6 10 Basic loss of system function 5 8–9 Significant decrease in system function 3–4 6–7 Reduced system functionality 1–2 1–5 System function has no effect 0 0

**Have spare No spare**

petrochemical companies generally has certain spare. During the production operation, once such mechanical equipment failure, you can immediately switch the standby equipment and quickly resume operations, which can effectively control downtime and avoid large economic losses. Therefore, the degree of impact of object failures with spare parts on system functions will be reduced accordingly. Therefore, in evaluating the object failures on the system, it needs to be divided into two cases: the object has standby and no standby. Based on the actual production process, the level of the SF index is determined, and its scoring standards are

The FF index is related to the trouble-free working time (MTBF) of the object. The MTBF value of the mechanical equipment of petroleum and petrochemical enterprises that has been in operation for a period of time can generally be obtained by analyzing the historical records of the operation of mechanical equipment. Relevant mechanical equipment reliability data are obtained through on-site operation and maintenance personnel's correction. Therefore, the FF index is divided into six levels by the MAXIMO system, the SAP management system, and the historical maintenance records of mechanical equipment during on-site maintenance. The

tinuous production operations, the important mechanical equipment in


**Table 7.** *Scoring criteria of MC.*
