Thailand’s Royal Irrigation Department (RID) projects have specific requirements: products must withstand continuous water pressure, resist erosion, and have longer service life than highway work. Box culverts meeting TIS-1165-2559 are designed for this duty.
Why RID specifies TIS-1165
TIS-1165-2559 covers box culverts 1.20 × 1.20 to 2.00 × 2.00 m — the size range required for:
- Irrigation transfer pipes for sustained water flow
- Canal road crossings at standard underpasses
- Water level control points in barrier dams
- Drainage handling variable pressures (seasonal wet/dry cycles)
Sizes from 1.20 to 2.00 m provide adequate cross-section for typical irrigation flow rates.
Additional engineering requirements
Beyond standard DOH specs (240 ksc concrete, SD40 reinforcement), RID work typically requires:
- Watertight concrete — water/cement ratio ≤ 0.45
- Joint sealing — rubber gasket or sealant at all joints
- Leakage testing before handover for watertight projects
- Increased concrete cover — 30-40 mm (vs. 25 mm standard)
Common RID sizes
| Size | Cross-section | Typical use |
|---|---|---|
| 1.20 × 1.20 m | 1.44 m² | Small irrigation channels |
| 1.50 × 1.50 m | 2.25 m² | Medium channels |
| 1.80 × 1.80 m | 3.24 m² | Larger channels |
| 2.00 × 2.00 m | 4.00 m² | Major channel road crossings |
Additional RID documentation
- Valid TIS-1165 certificate
- Leakage test report (if specified in TOR)
- Certificate of origin for materials
- Installation on prepared concrete base (RID has separate spec)
Selecting a supplier for RID work
- Verify TIS-1165 certification specifically (not just TIS-1164)
- Look for RID project references
- Confirm in-factory QC capability that can accept RID inspection
- Production capacity for multi-year contracts
Request a quote
Siripong Cement manufactures TIS-1165 box culverts in all standard sizes — experienced in RID projects across Central Thailand.
Contact us — response within 1 business day