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Effects of Temperature on High Density Polyethylene Piping and Accuracy of Ultrasonic Thickness Gaging

Figures 1-2

Table 1 Temperature and high density polyethylene pipe thickness*

Actual Thickness	+5.5 °C (+10 °F) Degrees Thickness	Error	+16.7 °C (+30 °F) Degrees Thickness	Error
5.3 (0.209)	5.2 (0.207)	0.05 (0.002)	5.0 (0.200)	0.23 (0.009)
7.8 (0.309)	7.7 (0.305)	0.10 (0.004)	7.5 (0.295)	0.35 (0.014)
13.0 (0.510)	12.7 (0.502)	0.20 (0.008)	12.4 (0.487)	0.58 (0.023)
18.0 (0.709)	17.7 (0.699)	0.25 (0.010)	17.2 (0.677)	0.81 (0.032)
21.0 (0.909)	23.0 (0.896)	0.33 (0.013)	22.0 (0.868)	1.04 (0.041)

* Measurements are in millimeters followed by inches.

Table 2 Assessing changes in temperature and material velocity

Liner Temperature in °C (°F)	Sonic Velocity in mm/s (in./s)
16.7 (62)	2.354 (0.0927)
17.2 (63)	2.352 (0.0926)
17.8 (64)	2.346 (0.0924)
22.8 (73)	2.316 (0.0912)
28.3 (83)	2.281 (0.0898)
33.9 (93)	2.245 (0.0884)
39.4 (103)	2.209 (0.0870)

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