Issues‎ > ‎vol23n1‎ > ‎


Using the Quality Control to Determine the Factors of Failure Operation in Cement Sector

Kawa M. Jamal Rashid1 & Sherzad Arif Hama1* 

1Department of Statistics and Informatics, College of Administration and Economics, University of Sulaimani, Kurdistan Region, Iraq

*Corresponding author’s e-mail:

Original: 10 July 2020 Revised: 10 February 2021 Accepted: 2 March 2021Published online: 20 June 2021

DOI link: 


Quality control technic is an important method of designing a strategic plan for many productive industries. The Shewhart control chart is that it uses only the information observation. Cumulative sum (CUSUM) and Exponentially weighted moving average (EWMA) two very effective alternatives to the Shewhart control chart may be used when small process shifts are of interest. This paper discusses data on  failure time of five cement mills in Sulaimani Mass cement factories, used, the reliability methods for analysis the failure time. The quality of the products manufactured in this factory has been estimated according to a quality control process through the use of specific control chart one of the chart Exponentially Weighted Moving Average (EWMA) chart. Whereas reliability concerns functioning under specified time. So, it can be said that the reliability is a relation between production with expected period time in quality. This study investigates the implementation of reliability and quality control. The findings indicate that factors that affecting the function of mills which will increase the failure rate of mills and lower their life span, through which quality of products will be affected.

Key Words: Quality Control; Exponentially Weighted Mowing Average (EWMA); Process Capability Indices  



[1] Beata Mrugalska, Edwin Tytyk. "Quality control methods for product reliability and safety". 6th International Conference on Applied Human Factors and Ergonomics (AHFE 2015) and the Affiliated Conferences, AHFE (2015).

[2] Dillon, B. S. "Applied Reliability and Quality: Fundamentals, Methods and Procedures". London: Springer, (2007).

[3] Finkelstein, Maxim. "Failure Rate Modeling for Reliability and Risk". London: Springer, (2008).

[4] Furterer, Sandra L. "Lean Six Sigma in Service: Applications and Case Studies". Boca Raton: CRC, (2009). 

[5] Jiang, Renyan. "Introduction to Quality and Reliability Engineering". Nielsen Bookdata, (2015).

[6] Kawa M. Jamal Rashid. "Design of an Exponentially Weighted Moving Average (EWMA) and An Exponentially Weighted Root Mean Square (EWRMS) ". Control  Charte (IJAERS). Vol 4, Issue-3,  pp. 88-91. (2017).

[7] Lazzaroni, Massimo. "Reliability Engineering Basic Concepts and Application in ICT". Berlin: Springer, (2011).

[8] "Life Data Analysis Reference Weibull". Tucson: ReliaSoft, (2015).

[9] Linnet, Kristian. "The Exponentially Weighted Moving Average (EWMA) Rule Compared With Traditionally Used Quality Control Rules". Clinical Chemistry & Laboratory Medicine. Vol. 44, No. 4, pp. 396-399. (2006).

[10] Montgomery, Douglas C. "Introduction to Statistical Quality Control". Hoboken, NJ: Wily, (2013).

[11] Ronald J. M. M. Does ,Abbas, Nasir, Muhammad Riaz. "Enhancing the Performance of EWMA Charts". Quality & Reliability Engineering International. Vol. 27, No. 6, pp. 821-833. (2011).