CPM and PERT
Standardizing Availability Definition
Vamshi K. Katukoori
Graduate Student: NAME
University Of New Orleans
Table of Contents
1.) Foreword
2.) Availability
3.) Introduction
4.) Availability Classification
5.) Reliability Terms
6.) Time Breakdown
7.) Time allocation
8.) Data Analysis
9.) Associated terms
10.) Definition of Inherent Availability in SMRP format
11.) Definition of Achieved Availability in SMRP format
12.) Definition of Operational Availability in SMRP format
13.) References
2
FOREWORD
A clear, simple, usable definition of, and a uniform procedure for, the measurement and reporting of availability in various forms is presented primarily to determine the essential metrics of availability of manufacturing process and equipment.
Terms, such as "uptime," "downtime," "reliability," "net available time," "total available time,”,"utilization," etc., are clearly defined before using them. This guideline is designed to eliminate some of the confusion relating to these terms by defining a consistent set of figures of merit relating to manufacturing process and equipment. One such term is
"Availability". Care has been taken while defining so that it has the advantage of simplicity, yet takes into account both the frequency and seriousness of equipment malfunctions and separates them from non-equipment-caused interruptions in operation.
Various metrics of availability are defined and the methods of measurement clearly stated. The method for measurement uses data that can be readily collected, in a reasonable time, and under practical conditions, making it suitable for use during equipment run-off/start-up, as well as continued production.
The term Availability is increasingly used to refer to a manufacturing asset or system without a specific limit on the nature of the asset. It could be a single machine or a complete facility. The term is applied to a piece of manufacturing equipment acting as a unit—usually one
Vamshi K. Katukoori
Graduate Student: NAME
University Of New Orleans
Table of Contents
1.) Foreword
2.) Availability
3.) Introduction
4.) Availability Classification
5.) Reliability Terms
6.) Time Breakdown
7.) Time allocation
8.) Data Analysis
9.) Associated terms
10.) Definition of Inherent Availability in SMRP format
11.) Definition of Achieved Availability in SMRP format
12.) Definition of Operational Availability in SMRP format
13.) References
2
FOREWORD
A clear, simple, usable definition of, and a uniform procedure for, the measurement and reporting of availability in various forms is presented primarily to determine the essential metrics of availability of manufacturing process and equipment.
Terms, such as "uptime," "downtime," "reliability," "net available time," "total available time,”,"utilization," etc., are clearly defined before using them. This guideline is designed to eliminate some of the confusion relating to these terms by defining a consistent set of figures of merit relating to manufacturing process and equipment. One such term is
"Availability". Care has been taken while defining so that it has the advantage of simplicity, yet takes into account both the frequency and seriousness of equipment malfunctions and separates them from non-equipment-caused interruptions in operation.
Various metrics of availability are defined and the methods of measurement clearly stated. The method for measurement uses data that can be readily collected, in a reasonable time, and under practical conditions, making it suitable for use during equipment run-off/start-up, as well as continued production.
The term Availability is increasingly used to refer to a manufacturing asset or system without a specific limit on the nature of the asset. It could be a single machine or a complete facility. The term is applied to a piece of manufacturing equipment acting as a unit—usually one
References: Machinery and Equipment, Second Edition, M-110.2. NCMS or SAE. 1995.