Relining & Repair Couplers
Relining and Rehabilitation Overview
Using Polyethylene to rehabilitate existing Ductile Iron and Steel pipelines that have reached the end of their operational life, is commonplace around the world. Approximately 50% of the Hong Kong Water Supplies Department's 5700km drinking and flushing water supply network was either rehabilitated or replaced between Years 2000 to 2015, the majority repaired or replaced using Polyethylene pipes.
Rehabilitation using PE typically involves the insertion of a custom size (non-standard pipe OD) PE pipe inside an existing host pipe, from point to point without excavation in-between. There are many techniques and methods available to perform this kind of rehabilitation in sizes from DN50 to DN2000 and larger
For more information on rehabilitation methods and polyethylene products, request our presentation on rehabilitation
The jointing of special non-standard size PE pipes can be challenging where there is no space for custom butt fusion equipment. Below is a wide range of specialty PE electrofusion couplers designed to accommodate a range of non-standard PE pipe sizes. In addition, specific custom size couplers can be manufactured to order where there is sufficient quantity. Contact us for more information about rehabilitation products.
Couplers / KM / XL / SDR17
The conical ring coupler KM XL features a unique flexible technology that is designed to accommodate changes in the size (OD) and shape (Ovality) of existing large diameter PE pipes when repairing or connecting to existing mains.
It is not uncommon for large-bore PE pipes that have been in service for some time, to grow 1-2% in diameter due to the constant hoop stress applied by the internal pressure. This increase in diameter is normal, however, it can make repair and connections using traditional slide over electrofusion couplers impossible.
Another common problem is uneven backfilling, this can force a pipe into an oval shape during installation and the pipe has been held in this oval position by the backfill since its initial burial. This ovality can also prevent repair couplers from being slid over the existing pipe.
The diameter range tolerance found in the KM XL overcomes this problem, installation can proceed after a single mechanical peeling, without the need for any retaining devices or re-rounding clamps. The KM XL can accommodate in-ground pipe ovality of up to 6% of OD.
The preparations (removing the oxide layer/cleaning) and the assembly work (conical ring activation/fusion) are described in the general assembly instructions for the FRIALEN conical ring coupler KM XL. The conical ring coupler KM XL must be fused exclusively with the powerful fusion unit FRIAMAT XL fitted with a Y plug with an input voltage of 400 V and output voltage of max 80 V. The conical ring coupler KM XL d 1200 must be fused twice, on both sides of the coupler.
Note: There are separate fusions required for both the inside and outside conical ring.
|
Product Code |
dn |
D |
L |
Availibility in Hong Kong |
|
P3314.11.355 |
355 |
497 |
705 |
12 weeks |
|
P3314.11.400 |
400 |
550 |
730 |
12 weeks |
|
P3314.11.450 |
450 |
602 |
750 |
12 weeks |
|
P3314.11.560 |
560 |
730 |
850 |
12 weeks |
|
P3314.11.630 |
630 |
805 |
940 |
12 weeks |
|
P3314.11.800 |
800 |
1005 |
1065 |
12 weeks |
|
P3314.11.1000 |
1000 |
1245 |
1145 |
12 weeks |
|
P3314.11.1200 |
1200 |
1450 |
1290 |
12 weeks |
Coupler / REM / SDR17
Relining couplers are designed for connecting custom size relining PE pipes (manufactured to non-standard OD's in order to fit inside existing DI or steel host pipes) to standard PE OD sizes. Featuring all the same technical benefits that UB couplers have, these couplers are used to make small step transitions. Friatec can custom manufacture relining couplers to accommodate most small steps found between custom relining pipe sizes and standard PE OD’s. Minimum Order Quantities (MOQ) will apply, contact Mill-Pro for your custom coupler requirements.
|
Product Code |
dn1 |
dn2 |
D |
L |
Availability in Hong Kong |
|
P3314.10.110100 |
110 |
100 |
127 |
150 |
12 weeks |
|
P3314.10.160150 |
160 |
150 |
180 |
180 |
12 weeks |
|
P3314.10.315300 |
315 |
300 |
355 |
285 |
12 weeks |
