Hempaprime Multi 500 19990
Hempel Paint & Coating Systems. Hempel marine coating systems are specialized epoxy and antifouling solutions for ship structures. Hempadur offers corrosion protection in ballast tanks and cargo holds through two-layer epoxy systems (primer + intermediate coat). Hempaguard is a premium hull coating with silicone hydrogel and patented ActiGuard technology z
Inspector Detail
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Common issues
- Premature coating breakdown from inadequate surface preparation or blast profile
- Under-film corrosion from moisture entrapment when applied over damp or contaminated steel
- Poor intercoat adhesion when the overcoating window is exceeded or the surface not properly prepared
- Holidays/pinholes from insufficient dry film thickness or application defects
- Blistering in immersed service (ballast tanks) from osmotic or application defects
- Cracking/checking at high-movement structural areas if the system's flexibility does not suit the application
Inspection checklist
- Verify surface preparation standard (e.g. Sa 2.5) and salt contamination before application
- Measure dry film thickness against the specified system thickness
- Perform holiday detection (wet sponge or high-voltage spark test as appropriate to DFT and coating type)
- Visual inspection for blistering, cracking, rust bleed, and mechanical damage at survey
- Adhesion pull-off testing where required by the specification
- Rate coating condition (Good/Fair/Poor per class guidance) at each tank/hold inspection
Service intervals
| Ballast tank coating condition survey | per class Condition Assessment/CSR requirements, typically at each Special Survey (5-year cycle) |
| Touch-up/spot repair | as identified during inspection, not on a fixed interval |
| Full recoat of immersed service | a properly applied PSPC-compliant system is typically specified for a 10-15 year target coating life - actual life depends on maintenance and mechanical damage |
Typical wear limits
| Dry film thickness tolerance | applied within the specified system DFT range per the product data sheet - confirm the exact tolerance against the specific project specification and PSPC requirement if applicable |
| Salt contamination limit before coating | PSPC-style specifications commonly require soluble salts below roughly 50 mg/m2 - confirm against the governing standard for the job |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Touch-up/spot repair stock of the same primer batch or maker-approved equivalent
- Matching intermediate and topcoat material for full system repair
- Holiday detector (wet sponge or high-voltage spark unit as appropriate)
- Dry film thickness (DFT) gauge
- Abrasive blast media for spot surface preparation
- Compatible thinner/solvent for application and cleanup
Safety
- Solvent vapor exposure in confined/enclosed tank spaces - forced ventilation and a gas-free certificate required before entry
- Flammability of solvent-based epoxy during application, keep away from hot work
- Skin/eye contact and sensitization risk from uncured epoxy components - PPE required
- General confined space entry hazards (oxygen deficiency, toxic atmosphere) independent of the coating
Class survey
Ballast tank coatings are assessed under the IMO Performance Standard for Protective Coatings (PSPC) where applicable, rated Good/Fair/Poor at Special Surveys; class expects the coating technical file (surface prep records, DFT/holiday test results, application conditions) retained on board and available for inspection.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Sa 2.5 (ISO 8501-1) surface roughness with Rugotest No. 3 or ISO comparator rough-medium inspect; visual inspection white surface
Ion tester before/after blast cleaning (ISO 8502-1/2/3); limit value <50 mg/m² PSPC
DFT meter use; 90% measured values ≥256 µm at 320 µm nominal; edges with stripe coating; all values document
Cure time per manufacturer instructions (Hempadur 15570: 5-47 hours); temperature monitoring (T ↓10°C ×2); full cure 1-2 months before test
ISO 4624 pull-off test after 1-2 months full cure; minimum adhesion ≥5 MPa immersion; ≥8 MPa >250 µm; 3 measurements/100 m²
Visual 100% inspection for blisters/scratches/peeling; surface roughness global max. 125 µm inspect; finish standard per ship class
Type-general inspection and maintenance points for this equipment category — not model-specific.
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