Telescopic tubes

Plastic vs Concrete Telescopic Risers – When to Use Which

Here is a clear comparison between plastic telescopic risers and concrete telescopic risers, including when to use them, their advantages, limitations, and recommendations for different types of wells.

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Plastic Telescopic Risers (PP/PE)

Also known as: telescopic neck, adjustable riser, plastic riser.

Plastic telescopic risers are mainly used on plastic wells (PP/PE) for stormwater, wastewater, LTA/LPS pump stations, drainage, and water meter wells.

✔ Advantages:

• Lightweight

• Corrosion-free

• Easy to adjust – even after installation

• Very flexible, handles ground movement well

• Excellent sealing with rubber gaskets

• Perfect for residential areas and light-traffic locations

✔ When to use plastic risers:

• Plastic stormwater or drainage wells

• LTA/LPS pump stations

• Water meter wells

• Garden areas, green surfaces, and driveways

• When the soil moves (frost heave, settling)

• When using plastic, composite, or light cast-iron covers

✔ Limitations:

• Not suitable for heavy traffic loads

• Must be properly fixed to prevent slipping

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Concrete Telescopic Risers (Concrete Cones / Adjusting Cones)

Used in concrete wells, especially in municipal systems, roads, and parking areas.

✔ Advantages:

• Extremely durable

• Handles heavy traffic classes (B125, C250, D400)

• Transfers vehicle load directly to the ground (not the well body)

• Long lifespan (50+ years)

• Compatible with cast iron cover frames

✔ When to use concrete risers:

• Roads, streets, and parking lots

• Heavy vehicle loads / truck traffic

• Municipal stormwater & sewer wells

• Inspection chambers with large diameters (Ø600–Ø1200 mm)

• When high load distribution is required

✔ Limitations:

• Heavy – usually requires machinery

• Less flexible (absorbs ground movement poorly)

• Not ideal for plastic wells

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Comparison – Plastic vs Concrete Risers

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Recommendations by Well Type

✔ Stormwater Well (Plastic)

→ Plastic riser + plastic or cast iron A15/B125 cover.

✔ Stormwater Well (Concrete, in road)

→ Concrete riser + cast iron C250/D400 cover assembly.

✔ Wastewater / Inspection Well (Residential)

→ Plastic well → plastic riser
→ Concrete well → concrete riser

✔ LTA/LPS Pump Station

→ Plastic riser + sealed composite cover.

✔ Water Meter Well

→ Plastic riser for plastic wells
→ Concrete riser for municipal installations

✔ Drainage Well

→ Plastic riser (simple, corrosion-free, adjustable)

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Summary

• Plastic telescopic riser → best for residential areas, plastic wells, flexible ground, and light traffic.

• Concrete telescopic riser → best for roads, parking areas, and heavy loads where traffic class is critical.