How to measure process performance (Pp & Ppk)?
How to measure process performance (Pp & Ppk)?
Hello Readers, Today we will learn “how to measure process performance?” Process Performance and its index can be measured by calculating the value manually or by using an Excel sheet or by using the software. In this post, we will calculate the Pp and Ppk value, but you can download the free Excel template or format for your ready reference, this offer is available for a limited time period! Don’t waste your time; just download the Format or Template from the below link.
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| How to use Step-1: Download the Template/ Format from the above links. Step-2: Read the note mentioned in excel template. Step-3: Only the yellow color box (mentioned in Template) is changeable and other values will calculate automatically. |
How to measure process performance (Pp & Ppk)?
As you know we have already told you that process performance and its index can be easily measured through an Excel sheet or by using the software. For manual calculation, we have to give more attention in basic knowledge and formula part. So, Pp and Ppk formula is given below, kindly go through it.
Formula of Pp (Process Performance):
Pp = ((USL-LSL)/ (6 X S))
[Where USL=Upper specification limit, LSL=Lower specification limit and S= Standard Deviation]
The formula of Ppk (Process Performance Index):
Ppk = Minimum of PPU or PPL
PPU= ((USL-Average of average)/ (3 X S))
PPL= ((Average of average-LSL)/ (3 X S))
Note: Pp ≥ Ppk.
Example:
A process engineer has collected 100 numbers of readings of molten grey cast iron carbon percentage.
Details of readings are given below:
| Sl.No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Subgroup1 | 3.22 | 3.28 | 3.21 | 3.23 | 3.27 | 3.24 | 3.24 | 3.22 | 3.24 | 3.28 |
| Subgroup2 | 3.21 | 3.29 | 3.26 | 3.23 | 3.28 | 3.21 | 3.26 | 3.21 | 3.26 | 3.29 |
| Subgroup3 | 3.25 | 3.23 | 3.24 | 3.21 | 3.29 | 3.25 | 3.24 | 3.23 | 3.25 | 3.27 |
| Subgroup4 | 3.20 | 3.20 | 3.25 | 3.25 | 3.25 | 3.26 | 3.26 | 3.22 | 3.26 | 3.27 |
| Subgroup5 | 3.21 | 3.25 | 3.26 | 3.28 | 3.24 | 3.21 | 3.28 | 3.21 | 3.25 | 3.28 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 3.26 | 3.31 | 3.28 | 3.24 | 3.27 | 3.21 | 3.28 | 3.24 | 3.27 | 3.21 |
| 3.25 | 3.20 | 3.29 | 3.21 | 3.28 | 3.26 | 3.29 | 3.21 | 3.28 | 3.26 |
| 3.24 | 3.26 | 3.27 | 3.25 | 3.29 | 3.24 | 3.23 | 3.25 | 3.29 | 3.24 |
| 3.26 | 3.22 | 3.27 | 3.26 | 3.25 | 3.25 | 3.20 | 3.26 | 3.25 | 3.25 |
| 3.24 | 3.22 | 3.28 | 3.21 | 3.24 | 3.26 | 3.25 | 3.21 | 3.24 | 3.26 |
Calculation:
| Characteristics | %C |
| Process: | Melting Process |
| USL | 3.3 |
| LSL | 3.2 |
| Std. Dev. | 0.03 |
| PPU | 0.65 |
| PPL | 0.61 |
| Pp | 0.63 |
| Ppk | 0.61 |
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