Are TDT certificates from Poland valid in Germany?

Yes. TDT certificates are recognised within the EU under mutual recognition for pressure vessel inspections. All our documentation is issued in Polish and can be provided with German translation.

What additional checks apply to food-grade stainless steel trailers?

Food trailers require proof of passivation (Cr₂O₃ layer intact), Ra ≤ 0.8 µm measurement certificate, and cleaning protocol using EC 1935/2004 compliant agents before the TDT inspector arrives.

Can I use my Feldbinder trailer while waiting for TDT inspection?

No. Once the TDT certificate expires, the pressure vessel is legally out of service. Contact us 2–3 months before the expiry date to schedule preparation and inspection.

03.03.2026

Feldbinder TDT Inspection: Stainless Steel Food Trailer Guide

In Brief

Feldbinder TDT inspection — stainless steel food trailers require mandatory periodic inspection every 2 years under PED 2014/68/EU. Additional requirements vs aluminium: Ra ≤ 0.8 µm certificate (ISO 4287), passivation certificate (ASTM A380), EC 1935/2004 seal compliance. Our pre-inspection package covers interior cleaning, Ra measurement, passivation (HNO₃ 30 % or Avesta 401 gel), PT weld inspection, seal replacement, and full documentation. TDT certificates issued in Poland are valid in all EU member states. DACH operators: 180 km from German border, invoicing in EUR, German documentation on request.

Feldbinder TDT Inspection for Stainless Steel Silo Trailers

Feldbinder silo trailers operating as pressure vessels require mandatory TDT (Transportowy Dozór Techniczny) periodic inspections under Polish law and EU Directive PED 2014/68/EU. Stainless steel food-grade trailers have additional hygiene documentation requirements.

Inspection Schedule

Type	Frequency
Periodic inspection	Every 2 years
Extended inspection + pressure test	Every 6 years
Post-repair inspection	After any welding on the pressure vessel
Post-accident inspection	After any structural damage

Additional Requirements for Food-Grade Stainless Steel

Unlike aluminium silo trailers, stainless steel food trailers must demonstrate:

Surface roughness — Ra ≤ 0.8 µm on all food-contact surfaces (ISO 4287 measurement protocol)
Passivation certificate — intact Cr₂O₃ layer on all stainless steel surfaces (ASTM A380)
Cleaning protocol — use of EC 1935/2004 compliant cleaning agents, pH-neutral residue-free
Seal compliance — FDA 21 CFR and EC 1935/2004 for EPDM and silicone seals

Our Pre-Inspection Preparation Service

We prepare Feldbinder trailers for TDT inspection:

Interior cleaning — alkaline wash + deionised water rinse
Ra measurement — instrument measurement of all surfaces, written protocol for inspector
Passivation — HNO₃ 30 % or Avesta 401 gel if passivation layer is compromised
PT weld inspection — dye penetrant testing of all internal weld seams (EN ISO 3452)
Seal replacement — dome seals, discharge port seals, all FDA-grade
Safety valve recertification — with calibration certificate
Pressure test — 1.0 × or 1.25 × MOP depending on inspection type
Document package — Ra protocol, passivation certificate, PT report, repair logs