Introduction Pre-Construction Standard Installation Installations Considerations Post-Construction References
Visual inspection
Infiltrations & Exfiltration
Air Testing
Deflection Testing
Test Yourself
If considered necessary, pipe deflection can be tested within 30 days of installation by pulling a mandrel through the installed pipe. Testing 10% of the overall project should provide a reasonable indication of installation quality. Typical practice is to set mandrels at 7.5% of the base inside diameter as shown in the following table. Mandrel test yield only pass/fail results and can provide misleading information. Further investigation should take place to ensure the problem is not being caused by, a foreign material in the pipe, a slightly offset joint, or some other similar situation.

Recommended Mandrel Settings

Nominal Inside Diameter in (mm)

Setting for 7.5% diameter reduction*, in (mm)

4 (100)

3.5 (89)

6 (150)

5.3 (134)

8 (200)

7.0 (179)

10 (250)

8.8 (223)

12 (300)

10.6 (268)

15 (375)

13.2 (335)

18 (450)

15.8 (402)

24 (600)

21.1 (536)

30 (750)

26.4 (670)

36 (900)

31.7 (805)

42 (1050)

37.0 (939)

48 (1200)

42.2 (1073)

54 (1350)

47.5 (1207)

60 (1500)

52.8 (1341)

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