Robar's Adjustable Stainless Steel Pipe Inserts are for use on thin wall PVC or High Density Polyethylene Pipe, to add hoop strength to pipe when using Robar couplings, repair clamps or restraining devices.
When using a restraining coupling, be sure the length is long enough to be within the restraint length. Available lengths are 6', 8"and 12"
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Remove the insert and wedges from the box and verify that the insert diameter corresponds to the inside diameter of the HDPE pipe.
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Gently compress the insert by hand and slide the insert into the pipe. Slide the insert until the pipe stops touch the face of the pipe.
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Examine the gap size in the insert to determine what size wedge is necessary: Wedge # 1: Gap size 2-1/2” or less. Wedge # 2: Gap size between 2-1/2” and 3”. Wedge # 3: Gap size 3” or greater.
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Slide the appropriate wedge into place. The insert will slide in between the 2 laminated sections of the wedge. Using a hammer, gently tap the wedge until it fits tightly into the insert.
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When the wedge is in its final position, there should be no gap between the insert and the pipe wall. If there are any gaps, remove the insert and reinstall using a larger wedge.
DR21 Adjustable Insert Size Guide
| Nom. Pipe OD |
DR21 - Avg Inside ⌀
|
DR21 - Min. Wall Thickness |
| 4" |
4.046 |
0.214 |
| 6" |
5.957 |
0.315 |
| 8" |
7.754 |
0.411 |
| 10" |
9.665 |
0.512 |
| 12" |
11.463 |
0.607 |
DR17 Adjustable Insert Size Guide
Nom. Pipe OD
|
DR17 - Avg Inside ⌀
|
DR17 - Min. Wall Thickness |
4"
|
3.938
|
0.265
|
6"
|
5.798
|
0.39
|
8"
|
7.55
|
0.507
|
10"
|
9.41
|
0.632
|
12"
|
11.16
|
0.75
|
DR11 Adjustable Insert Size Guide
| Nom. Pipe OD |
DR11 - Avg Inside ⌀
|
DR11 - Min. Wall Thickness |
| 4" |
3.633 |
0.409 |
| 6" |
5.349 |
0.602 |
| 8" |
6.963 |
0.784 |
| 10" |
8.679 |
0.977 |
| 12" |
10.293 |
1.159 |
