This guide will assist in the inspection of all types and configurations of Polyethylene (HDPE) pipe, couplings and fittings. Answer each question and take the action indicated for the answer given. If no condition is provided for a particular answer, move on to the next question. It is the responsibility of the inspector to confirm that this inspection guide is in accordance with current specifications.
Every lot should be visually inspected. The lot that appears to have the defects, or a lot selected at random if all lots appear to be of equal quality, shall be inspected in greater detail to generally establish the Quality Control practices of the manufacturer. And at least one pipe per size offered in the lot shall be inspected in detail using this inspection guide. The manufacturer may provide the definition of a lot. If no definition is provided, a lot will be one day’s production. Or, if at the project, a lot shall be the entire quantity shipped.
If this inspection guide is used to inspect a rejected pipe, it shall be submitted with the notification to the manufacturer of the failure to meet specification.
| Has any of the material or pipe included in this lot been rejected during a previous inspection visit? If Yes, the entire lot is unacceptable. |
Yes |
No
|
| Is this manufacturer approved for production of HDPE pipe? (Refer to Table 1047.2.1.1 Qualified Fabricators of Corrugated Polyethylene Culvert Pipe (1047CPPE)). If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe accompanied by a bill of lading or delivery receipt at this location? If No, stop, the pipe is unacceptable. |
Yes |
No
|
| Does the bill of lading or delivery receipt contain an itemized list of the sizes and lengths of pipe? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Does the bill of lading or delivery receipt contain a MoDOT sample ID or is it accompanied by a Material Shipping Report Form? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe marked (in accordance with AASHTO M 294) with the manufacturer’s name or trademark? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe marked (in accordance with AASHTO M 294) with the nominal pipe size? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe marked (in accordance with AASHTO M 294) with the designation of “AASHTO M 294”? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe marked (in accordance with AASHTO M 294) with the plant designation code? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Is the pipe marked (in accordance with AASHTO M 294) with the date of manufacture or an appropriate code? (If unsure, contact the manufacturer.) If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Do the markings repeat on the pipe on intervals not exceeding 10 ft.? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Are there any visible cracks, holes, creases, foreign materials, or other injurious defects that would be an indication of poor workmanship? If Yes, stop; the pipe is unacceptable. |
Yes |
No
|
| Does the pipe have either, corrugated surfaces inside and out, or a corrugated surface outside and a smooth inner liner? If No, stop; the pipe is unacceptable (unless otherwise specified). |
Yes |
No
|
| Are the color, density, and other physical properties uniform along the length of the pipe? If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Are the ends of the pipe cut squarely and cleanly (where applicable)? If No, stop; the pipe is unacceptable. |
Yes |
No
|
The average inside diameter shall be measured using a tapered plug gage and the procedure set forth in ASTM D 2122. In the event that a tapered plug gage is not available, the measurement shall be made using a suitable device accurate to at least 1/8 in.” (standard tape measure). Eight measurements should be taken equally spaced around the circumference of the pipe. This should be done on two sections of the pipe (upstream and downstream ends). Average these 16 measurements to obtain the average inside diameter.
| Is the average inside diameter within the specified tolerance of the nominal pipe size? (Refer to Tables 1047.5.3 and 1047.5.4.) If No, stop; the pipe is unacceptable. |
Yes |
No
|
The wall thickness is measured using a cylindrical or ball anvil tubing micrometer (preferably accurate to within 0.001 in.). A minimum of 8 measurements are made at closely spaced intervals to ensure that the minimum and maximum wall thicknesses have been determined. The values are then averaged to obtain the average wall thickness.
| Is the wall thickness greater than or equal to the corresponding minimum specified wall thickness? (Refer to Table 1047.5.1 or Table 1047.5.2). If No, stop; the pipe is unacceptable. |
Yes |
No
|
| Has 10 percent of the pipe in the same lot of pipe been rejected? If Yes, stop; the entire lot of pipe is unacceptable. |
Yes |
No
|
Couplings and Fittings (where applicable)
| Are the couplings for fittings made of the same base material as the pipe? If No, stop; the couplings or fittings are unacceptable. |
Yes |
No
|
| Do the corrugations of the couplings or fittings have the same corrugation configuration in the pipe ends that are being connected? If No, stop; the couplings or fittings are unacceptable. |
Yes |
No
|
| Does the coupling or fitting reduce the inside diameter of the pipe being joined by more than 1/2 in.? If Yes, stop, the coupling or fitting is unacceptable. |
Yes |
No
|
| If the coupling is a “split coupling,” does it engage at least two full corrugations? If No, stop; the coupling is unacceptable. |
Yes |
No
|
| Is the fitting length within ½ in. of the manufacturer’s specified dimension? If No, stop; the fitting is unacceptable. |
Yes |
No
|
| Do the fittings noticeably reduce or impair the overall integrity or function of the pipe line? If Yes, stop; the pipe is unacceptable. |
Yes |
No
|
Table 1047.5.1 Minimum Wall Thickness (English)
| Nominal Size of Pipe, in. |
Wall Thickness, in.
|
| 12 |
0.04
|
| 15 |
0.04
|
| 18 |
0.05
|
| 21 |
0.06
|
| 24 |
0.06
|
| 27 |
0.06
|
| 30 |
0.06
|
| 36 |
0.07
|
| 42 |
0.07
|
| 48 |
0.07
|
| 54 |
0.08
|
| 60 |
0.08
|
Table 1047.5.2 Minimum Wall Thickness (metric)
| Nominal Size of Pipe, mm |
Wall Thickness, mm
|
| 300 |
0.9
|
| 375 |
1.0
|
| 450 |
1.3
|
| 525 |
1.5
|
| 600 |
1.5
|
| 675 |
1.5
|
| 750 |
1.5
|
| 900 |
1.7
|
| 1050 |
1.8
|
| 1200 |
1.8
|
| 1350 |
2.0
|
| 1500 |
2.0
|
Table 1047.5.3 Diameter Dimensional Tolerances (English)
| Specified Inside Diameter, in. |
Lower Tolerance, in. |
Lower Tolerance, mma |
Upper Tolerance, in. |
Upper Tolerance, mma
|
| 12 |
11 13/16 |
300 |
12 17/32 |
318
|
| 15 |
14 25/32 |
375 |
15 11/16 |
398
|
| 18 |
17 23/32 |
450 |
18 13/16 |
478
|
| 21 |
20 11/16 |
525 |
21 15/16 |
557
|
| 24 |
23 5/8 |
600 |
25 3/32 |
637
|
| 27 |
26 19/32 |
675 |
28 7/32 |
717
|
| 30 |
29 9/16 |
751 |
31 11/32 |
796
|
| 36 |
35 15/32 |
901 |
37 15/32 |
952
|
| 42 |
41 3/8 |
1051 |
43 15/32 |
1104
|
| 48 |
47 9/32 |
1201 |
49 15/32 |
1257
|
| 54 |
53 3/16 |
1351 |
55 15/32 |
1409
|
| 60 |
59 3/32 |
1501 |
61 15/32 |
1561
|
| a The metric dimension conversions are approximately converted from their English counterparts.
|
Table 1047.5.4 Diameter Dimensional Tolerances (Metric)
| Specified Inside Diameter, in. |
Lower Tolerance, mm |
Lower Tolerance, in.a |
Upper Tolerance, mm |
Upper Tolerance, in.a
|
| 300 |
296 |
11 5/8 |
314 |
12 11/32
|
| 375 |
369 |
14 17/32 |
392 |
15 7/16
|
| 450 |
443 |
17 7/16 |
470 |
18 1/2
|
| 525 |
517 |
20 3/8 |
549 |
21 19/32
|
| 600 |
591 |
23 9/32 |
627 |
24 11/16
|
| 675 |
665 |
26 3/16 |
705 |
27 25/32
|
| 750 |
739 |
29 3/32 |
784 |
30 7/8
|
| 900 |
887 |
34 29/32 |
937 |
36 7/8
|
| 1050 |
1034 |
40 23/32 |
1087 |
42 13/16
|
| 1200 |
1182 |
46 17/32 |
1237 |
48 11/16
|
| 1350 |
1330 |
52 11/32 |
1387 |
54 5/8
|
| 1500 |
1478 |
58 5/32 |
1537 |
60 1/2
|
| a The English dimension conversions are approximately converted from their metric counterparts.
|