160mm Underground Drainage System
Technical Data Sheet
Document Reference: TDS-UG-160-001
Issue Date: February 2026
System: 160mm Ring Seal Underground Drainage
Product Description
The Kalsi 160mm underground drainage system is designed for larger capacity applications where 110mm is insufficient. Suitable for multi-dwelling drainage, commercial installations, and upgrades to undersized systems. Manufactured to BS EN 1401-1 with full Kitemark and BBA certification.
System Dimensions
Pipe
| Dimension | Value | Tolerance |
|---|---|---|
| External diameter | 160mm | ±0.4mm |
| Internal diameter | 152.4mm | ±0.4mm |
| Wall thickness | 3.8mm (SN4) | ±0.2mm |
| Available lengths | 3m, 6m | ±5mm |
| Weight | 2.45 kg/m | - |
Hydraulic Performance
Flow Capacity (Full Bore)
| Gradient | Flow Rate | Velocity |
|---|---|---|
| 1:40 | 25.5 L/s | 1.3 m/s |
| 1:60 | 20.8 L/s | 1.1 m/s |
| 1:80 | 18.0 L/s | 0.9 m/s |
| 1:100 | 16.1 L/s | 0.8 m/s |
Material Specification
| Property | Specification |
|---|---|
| Material | PVC-U (unplasticised polyvinyl chloride) |
| Standard | BS EN 1401-1:2019 |
| Colour | Terracotta |
| Ring stiffness | SN4 (≥4 kN/m²) |
Product Range Summary
Pipes
| Description | Part Code | Pack Qty |
|---|---|---|
| Plain Ended Pipe 3m | UG160P3M | 45 |
| Plain Ended Pipe 6m | UG160P6M | 45 |
| Single Socket Pipe 3m | UG160PSS3M | 45 |
| Single Socket Pipe 6m | UG160PSS6M | 45 |
Couplings
| Description | Part Code | Pack Qty |
|---|---|---|
| Double Socket Coupler | UG160PVCB | 25 |
| Slip Coupler | UG160CPVCS | 25 |
| Reducer 160-110mm | UG160RED | 20 |
Bends
| Description | Part Code | Angle | Pack Qty |
|---|---|---|---|
| Double Socket Bend | UG160B90 | 90° | 12 |
| Double Socket Bend | UG160B87.5 | 87.5° | 10 |
| Double Socket Bend | UG160B45 | 45° | 18 |
| Double Socket Bend | UG160B30 | 30° | 18 |
| Double Socket Bend | UG160B15 | 15° | 18 |
| Single Socket Bend | UG160SB45 | 45° | 18 |
Junctions
| Description | Part Code | Angle | Pack Qty |
|---|---|---|---|
| Triple Socket Branch | UG160JTS87.5 | 87.5° | 8 |
| Triple Socket Branch | UG160JTS45 | 45° | 8 |
| 160×110 Level Invert Junction | UG160×110LI | - | 6 |
Access Fittings
| Description | Part Code | Pack Qty |
|---|---|---|
| Socket Plug | UG160AP5 | 25 |
| Access Pipe | UG160AFP | 10 |
Inspection Chambers
Compatible with 470mm chamber system with appropriate adaptors.
Applications
When to Specify 160mm
- Multiple dwellings on shared drainage
- Commercial developments
- Upgrade from undersized 110mm
- Combined surface and foul systems
- Industrial applications
Comparison with 110mm
| Factor | 110mm | 160mm |
|---|---|---|
| Capacity (1:60) | 6.7 L/s | 20.8 L/s |
| Typical use | Single dwelling | Multiple dwellings |
| Cost | Lower | Higher |
| Excavation | Narrower trench | Wider trench |
Installation Guidelines
Trench Preparation
| Requirement | Specification |
|---|---|
| Minimum width | Pipe OD + 400mm |
| Bed depth | Minimum 150mm granular |
| Side support | 200mm minimum each side |
| Crown cover | 300mm above pipe crown |
Gradient
Minimum 1:100 for all applications.
Standards Compliance
- ✓ BS EN 1401-1:2019
- ✓ BSI Kitemark certified
- ✓ BBA certified
- ✓ Building Regulations compliant
- ✓ UK manufactured
Guarantee
Product Guarantee: 30 years against manufacturing defects
© Kalsi Plastics Ltd. All rights reserved.