In Brief
TDT refusal means the TDT inspector found defects preventing safe operation of the pressurised vessel. The trailer cannot transport bulk cargo under pressure until faults are resolved and a re-inspection passes. Most common causes: pressure test leak, defective safety valve, corroded tank wall, incomplete documentation. PHS Magnum repairs the identified faults and organises re-inspection with the TDT inspector at our workshop – typically 3–7 working days from arrival.
Silo Trailer Refused TDT Inspection – What to Do
A TDT refusal document is not the end – it’s a precise repair specification. Our job is to fix every item on the list and get your trailer back into legal operation as fast as possible.
Important: After a TDT refusal, the pressure vessel cannot be used for bulk transport. Drive the unit unladen to our workshop in Chorula (A4 exit Gogolin).
Most Common Reasons for TDT Refusal
Based on over 30 years of TDT inspection support at PHS Magnum:
1. Pressure vessel leak during hydraulic test
The TDT inspector conducts a hydraulic test at 1.5× nominal pressure. Leakage exceeding 1% of volume per minute disqualifies the vessel. Typical causes: weld cracks, pitting corrosion, worn inspection hatch gaskets.
Repair: TIG/MIG welding with TDT documentation, gasket replacement, corrosion area repair.
2. Missing or defective safety valve
Safety valves must open within ±10% of the set pressure. A recalibrated or stuck valve, or missing calibration seal – grounds for refusal.
Repair: Safety valve replacement. Time: 1–2 hours.
3. Tank wall thickness below minimum
TDT uses ultrasonic wall thickness measurement. Minimum wall thickness is specified in the vessel documentation. Corrosion is the most common issue on steel tanks without adequate coating.
Repair: Section replacement or reinforcement welding with full recertification.
4. Expired pressure gauge calibration
Gauges require calibration every 2 years. Expired calibration seal = defect.
Repair: Gauge replacement or recalibration. We stock calibrated replacement gauges.
5. EBS/ABS brake system faults
The TDT inspector also checks the brake system. Active EBS fault codes, worn brake actuators, or brake circuit leaks block certification alongside the pressure vessel check.
Repair: EBS diagnostics via Wabco interface, defective component replacement.
PHS Magnum Procedure After TDT Refusal
- Bring the refusal document – the TDT protocol listing all defects
- Repair quote – within 24 hours we provide a fixed quote for all listed defects
- Repairs – completed in 1–5 working days depending on scope
- Re-inspection – TDT inspector comes to our workshop in Chorula
- Certification – vehicle documentation updated, trailer back in service
Total turnaround: typically 3–7 working days.
Repair Time Estimates
| Defect | Repair time |
|---|---|
| Safety valve replacement | 1–2 h |
| Weld leak repair | 3–8 h |
| Inspection hatch gaskets (full set) | 2–4 h |
| Pressure gauge replacement (set) | 1 h |
| EBS diagnosis + repair | 2–4 h |
| Corrosion repair (section) | 8–16 h |
Pricing on request after inspection of the TDT refusal protocol.
Contact our TDT department: +48 504 788 385 (mgr inż. Roland Sobota) Email: biuro@magnumchorula.pl – reply within 4 hours.
Related: TDT inspections – silo trailers · Silo trailer service · Silo trailer faults · Original spare parts
