In Brief
Spitzer silo trailer service — key maintenance areas: (1) pneumatic discharge system (aeration pads, valves, compressor), (2) dome hatch seals, (3) Camlock couplings, (4) running gear and electrics. Aeration pad service interval: 6 months or 50,000 km; replacement: polyester 12–18 months, polyamide 12–18 months, silicone FG 24 months. TDT pressure vessel inspection: mandatory every 2 years. Pre-TDT preparation: 1–2 working days at PHS Magnum. Emergency service on the A4: +48 602 716 551.
Spitzer Silo Trailer: Complete Maintenance Guide
Spitzer silo trailers are built from aluminium alloy EN AW-5083 and EN AW-6061 for transporting plastic granules, cement, flour, and other bulk materials. Correct maintenance keeps the operating permit valid and prevents cargo contamination.
Key Maintenance Areas
1. Pneumatic Discharge System
The pneumatic discharge system is the heart of the Spitzer trailer. It uses compressed air flowing through aeration pads to fluidise the bulk cargo, allowing it to flow out under gravity. Maintenance includes:
- Pressure test of the entire system (test pressure 1.25 × MOP)
- Visual inspection and replacement of aeration pads
- Discharge valve inspection (DN80–DN125 ball and butterfly valves)
- Safety valve calibration (set pressure verification)
- Pipe distribution cleaning and leak test
2. Aeration Pads
Aeration pads are consumable items with a limited service life:
| Material | Application | Replacement interval |
|---|---|---|
| Polyester (PES) | Grain, sugar, flour | 12–18 months |
| Polyamide (PA) | Plastic granules, cement | 12–18 months |
| Silicone FG (FDA) | Food/pharma contact | 24 months or on discolouration |
| PTFE | Chemically aggressive materials | 24–36 months |
Signs of worn aeration pads: reduced discharge rate, incomplete discharge, air leakage through the pad surface.
3. Dome Hatch Seals
Dome hatch seals are the primary barrier against moisture and contamination of the cargo. Check for cracks, hardening, and permanent deformation during every service.
| Hatch type | Seal material | Standard replacement |
|---|---|---|
| Round D500 | EPDM | Annually |
| Oval 430×600 | EPDM / NBR | Annually |
| Return port D410 | EPDM | Every 2 years |
4. Camlock Couplings
Camlock couplings (Type C, D, E) connect the discharge pipe to the receiving tank. Inspect for:
- Corrosion on locking arms
- Seal wear (replace NBR/EPDM seals annually)
- Proper latching of the locking arms (no half-open condition)
Pre-Season Inspection Checklist
Before returning a trailer to service after winter storage or a long break:
- Check all aeration pads — flex by hand, replace if stiff
- Inspect dome seals — no cracks or permanent compression
- Test discharge system at 0.2 bar — verify no leaks
- Inspect Camlock couplings and replace seals
- Verify safety valve set pressure with calibrated gauge
- Check suspension: air bags, shock absorbers, lift axle
- Verify ADR documentation is current
When to Schedule TDT Inspection
The TDT/TDT technical inspection for a pressure vessel trailer is mandatory every 2 years (periodic inspection) and every 6 years (extended inspection with pressure test). Do not wait for the deadline — schedule 2–3 months in advance to allow time for any repairs before the inspection.
Related: Spitzer trailer service · Spare parts · TDT inspection · Repair & renovation