HDPE Skid Spacers for Casing Pipes
HDPE skid spacers—also known as casing spacers or pipe spacers—support, center and electrically isolate a carrier pipe inside a larger casing pipe.
Their non-metallic construction helps protect coated and cathodically protected pipelines from direct contact with the casing. The modular design can be configured for a wide range of pipe diameters, installation clearances and load requirements.
Manufactured from high-density polyethylene, these spacers provide a practical combination of strength, corrosion resistance, low friction and electrical isolation for demanding pipe-in-pipe installations.
Available Runner Heights
H50
H160
H200
Applications
These non-corroding, non-metallic casing spacers are designed for pipe-in-pipe applications, including cased crossings, road and railway crossings, bore installations and sliplining projects.
They can support medium- and heavy-duty carrier pipes made from steel, ductile iron, mild-steel cement-lined pipe, glass-reinforced epoxy, PVC and HDPE. The segmented design accommodates outside diameters from approximately 400 mm to 1600 mm and can be extended for larger diameters by adding additional segments.
Key Features
Durable HDPE Construction High flexural strength, abrasion resistance, chemical resistance and reliable performance across a broad temperature range.
Low-Friction Installation Integrated runners help reduce insertion resistance, allowing the carrier pipe to move more smoothly through the casing.
Non-Metallic and Non-Corrosive The HDPE segments and nylon fasteners provide electrical isolation and eliminate corrosion associated with metallic spacer components.
Modular Segment Design Snap-together segments are assembled around the carrier pipe and secured with nylon fasteners. Segment quantities are selected to match the required pipe outside diameter.
Load-Sharing Runner System Loads are distributed across multiple runners to reduce localized point loading and increase the spacer ring's overall load capacity.
Configurable Runner Heights Different runner heights can be combined within one spacer ring to compensate for clearance variations or assist with grade correction.
Segment Selection Guide
| Carrier Pipe OD | Number of Segments |
|---|---|
| 400–480 mm | 9 |
| 500–525 mm | 10 |
| 526–575 mm | 11 |
| 576–625 mm | 12 |
| 626–675 mm | 13 |
| 676–725 mm | 14 |
| 726–775 mm | 15 |
| 776–825 mm | 16 |
| 826–875 mm | 17 |
| 876–925 mm | 18 |
| 926–975 mm | 19 |
| 976–1025 mm | 20 |
| 1026–1075 mm | 21 |
| 1076–1125 mm | 22 |
| 1126–1175 mm | 23 |
| 1176–1225 mm | 24 |
| 1226–1275 mm | 25 |
| 1276–1325 mm | 26 |
| 1326–1375 mm | 27 |
| 1376–1425 mm | 28 |
| 1426–1475 mm | 29 |
| 1476–1525 mm | 30 |
Ductile Pipe Spacer Calculation — DN400 to DN900
| Pipe Size | DN400 | DN600 | DN800 | DN900 |
|---|---|---|---|---|
| Nominal Inside Diameter | 400 mm | 600 mm | 800 mm | 900 mm |
| Socket OD | 516.2 mm | 738.5 mm | 974 mm | 1082 mm |
| Spigot OD | 429 mm | 635 mm | 842 mm | 945 mm |
| Restraining Gland OD | 630 mm | 853 mm | 1100 mm | 1218 mm |
| Required Clearance Height | 100 mm | 109 mm | 129 mm | 136.5 mm |
| Skid Spacer Height | 166 mm | 166 mm | 166 mm | 166 mm |
| Pipe Length | 6 m | 6 m | 6 m | 6 m |
| Pipe Weight | 482 kg | 882 kg | 1394 kg | 1691 kg |
| Contained Water Weight | 753 kg | 1696 kg | 3014 kg | 3815 kg |
| Total Supported Weight | 1235 kg | 2578 kg | 4408 kg | 5506 kg |
| Number of Spacer Rings | 3 | 3 | 5 | 5 |
| Capacity per Spacer Ring | 3200 kg | 3200 kg | 3200 kg | 3200 kg |
| Total Spacer Capacity | 9600 kg | 9600 kg | 16,000 kg | 16,000 kg |
| Calculated Safety Factor | 7.77 | 3.72 | 3.62 | 2.90 |
| Segment Configuration | 6 × H160 + 3 × H50 | 8 × H160 + 5 × H50 | 10 × H160 + 7 × H50 | 12 × H160 + 7 × H50 |
Ductile Pipe Spacer Calculation — DN1000 to DN1600
| Pipe Size | DN1000 | DN1200 | DN1400 | DN1600 |
|---|---|---|---|---|
| Nominal Inside Diameter | 1000 mm | 1200 mm | 1400 mm | 1600 mm |
| Socket OD | 1191 mm | 1412.5 mm | 1592.1 mm | 1815.9 mm |
| Spigot OD | 429 mm | 635 mm | 842 mm | 945 mm |
| Spigot OD | 1048 mm | 1255 mm | 1462 mm | 1668 mm |
| Restraining Gland OD | 1391 mm | 1609 mm | 1857 mm | 2032 mm |
| Required Clearance Height | 172 mm | 177 mm | 179 mm | 182 mm |
| Skid Spacer Height | 200 mm | 200 mm | 200 mm | 200 mm |
| Pipe Length | 6 m | 6 m | 6 m | 6 m |
| Pipe Weight | 2017 kg | 2758 kg | 3669 kg | 4666 kg |
| Contained Water Weight | 4710 kg | 6782 kg | 9231 kg | 12,057 kg |
| Total Supported Weight | 6727 kg | 9540 kg | 12,900 kg | 16,723 kg |
| Number of Spacer Rings | 7 | 7 | 7 | 9 |
| Capacity per Spacer Ring | 3200 kg | 3200 kg | 3200 kg | 3200 kg |
| Total Spacer Capacity | 22,400 kg | 22,400 kg | 22,400 kg | 28,800 kg |
| Calculated Safety Factor | 3.30 | 2.35 | 1.73 | 1.72 |
| Segment Configuration | 13 × H200 + 8 × H50 | 16 × H200 + 9 × H50 | 19 × H200 + 10 × H50 | 21 × H160 + 12 × H50 |
Engineering note: The tables above show typical configurations based on the original reference data. Final spacer height, ring spacing, segment quantity and load capacity must be confirmed according to the actual carrier-pipe OD, casing ID, joint dimensions, pipe weight, installation method and project safety requirements.