{"id":6430,"date":"2025-07-09T17:46:06","date_gmt":"2025-07-09T09:46:06","guid":{"rendered":"https:\/\/alllandpipes.com\/?post_type=etheme_portfolio&p=6430"},"modified":"2025-12-17T18:57:25","modified_gmt":"2025-12-17T10:57:25","slug":"din-30671","status":"publish","type":"etheme_portfolio","link":"https:\/\/alllandpipes.com\/fr\/standards\/din-30671.html","title":{"rendered":"DIN 30671"},"content":{"rendered":"
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Specifications for Thermoset Coatings on Buried Steel Pipes<\/b><\/strong><\/span><\/h2>

1. Scope and Technical Principles<\/b><\/strong><\/span><\/h3>

1.1 Standard Definition & Evolution<\/b><\/strong><\/span><\/h4>

DIN 30671<\/b><\/strong><\/a>\u00a0Carbon Steel Welding Pipe Coating SpecificationDIN 30671 DSHA ( German Institute for Standardisation )_DIN coating pipe standardDIN 30671 is the standard specification for Cement Mortar Lining for ductile iron pipes and fittings for water application published by the Deutsches Institut f\u00fcr Normung (DIN) in 1998. Its complete name is \u201cThermoset plastic coatings for buried steel pipe.\u201d This standard organizes the material selection, manufacturing procedures, and quality control requirements for thermosetting coatings used for the exterior protection of steel pipe lines in underground and\/or underwater services. It was developed during the Post-World War II rebuilding in the middle of Germany where in the immediate years before World War II, there was a market for a long-term creation of a corrosion prevention renovation material which in this case could be shown in re-lining gas works and district heating pipe<\/p>

Corrosion Protection Mechanism:<\/b><\/strong><\/p>

Function<\/td>Technical Basis<\/td>Mesure de la performance<\/td><\/tr>
Dielectric Barrier<\/b><\/strong><\/td>Isolation from electrolytes<\/td>Volume resistivity >1\u00d710\u00b9\u2076 \u03a9\u00b7m<\/td><\/tr>
Compatibilit\u00e9 cathodique<\/b><\/strong><\/td>Synergy with CP systems<\/td>Disbondment radius \u22648mm @ -1.5V\/CSE<\/td><\/tr>
Mechanical Adhesion<\/b><\/strong><\/td>Anchor profile (50-100 \u03bcm)<\/td>Peel strength \u226550 N\/cm (FBE)<\/td><\/tr><\/tbody><\/table><\/figure>

Service Life: >50 years in moderate soils (2-3\u00d7 longer than asphalt coatings).<\/p>

2. Material Systems & Requirements<\/b><\/strong><\/span><\/h3>

2.1 Applicable Conditions<\/b><\/strong><\/span><\/h4>

Media: <\/b><\/strong>Water, gas, crude oil, non-corrosive chemicals<\/p>

Temperature:<\/b><\/strong>\u00a0-30\u00b0C to +70\u00b0C (standard); up to 140\u00b0C (EN 10290)<\/p>

Pipe Dimensions: <\/b><\/strong>DN 20 (1″) to DN 2000 (78″); WT \u22652.0 mm<\/p>

Exclusions: <\/b><\/strong>Steam pipes (>120\u00b0C), UV-exposed sections, pH<4 or pH>10 soils<\/p>

2.2 Coating Classification<\/b><\/strong><\/span><\/h4>
Type de rev\u00eatement<\/b><\/strong><\/td>\u00c9paisseur<\/b><\/strong><\/td>Propri\u00e9t\u00e9s principales<\/b><\/strong><\/td>Limites<\/b><\/strong><\/td><\/tr>
FBE<\/b><\/strong><\/td>300-500 \u03bcm<\/td>Adhesion \u226550 N\/cm; CD \u22648mm @65\u00b0C\/48h<\/td>Low flexibility<\/td><\/tr>
Polyurethane (PU)<\/b><\/strong><\/td>500-1000 \u03bcm<\/td>Impact \u226515J @23\u00b0C; rapid curing<\/td>UV degradation<\/td><\/tr>
PU-Asphalt<\/b><\/strong><\/td>1.0-3.0 mm<\/td>Water absorption <0.5%; high groundwater resistance<\/td>Environmental hazards (benzopyrene)<\/td><\/tr><\/tbody><\/table><\/figure>

3. Technical Requirements<\/b><\/strong><\/span><\/h3>

3.1 Dimensional Tolerances<\/b><\/strong><\/span><\/h4>
Param\u00e8tres<\/b><\/strong><\/td>Exigence<\/b><\/strong><\/td>Test Method<\/b><\/strong><\/td><\/tr>
\u00c9paisseur du rev\u00eatement<\/b><\/strong><\/td>Min. 90% nominal; local min. 80% nominal<\/td>Magnetic gauge (4 pts\/2m)<\/td><\/tr>
Holiday Detection<\/b><\/strong><\/td>Zero defects @ 3.0 kV\/mm<\/td>Spark tester (100% coverage)<\/td><\/tr>
Weld Coverage<\/b><\/strong><\/td>Full coverage; +50% thickness allowed<\/td>Visual\/UT verification<\/td><\/tr>
Cutback Length<\/b><\/strong><\/td>100\u00b110 mm (uncoated for welding)<\/td>Mesure au pied \u00e0 coulisse<\/td><\/tr><\/tbody><\/table><\/figure>

3.2 Mechanical\/Chemical Performance<\/b><\/strong><\/span><\/h4>
Test<\/b><\/strong><\/td>Condition<\/b><\/strong><\/td>Crit\u00e8res d'acceptation<\/b><\/strong><\/td>Standard<\/b><\/strong><\/td><\/tr>
Adh\u00e9sion<\/b><\/strong><\/td>Cross-cut<\/td>Grade 0-1 (no peeling)<\/td>ISO 2409<\/td><\/tr>
D\u00e9collement cathodique<\/b><\/strong><\/td>65\u00b0C\/48h\/-1.5V vs CSE<\/td>\u22648 mm (FBE); \u226410 mm (PU)<\/td>ASTM G8<\/td><\/tr>
R\u00e9sistance aux chocs<\/b><\/strong><\/td>-30\u00b0C<\/td>\u22655 J<\/td>ASTM G14<\/td><\/tr>
Salt Spray<\/b><\/strong><\/td>2000 hrs<\/td>No blistering<\/td>ISO 7253<\/td><\/tr><\/tbody><\/table><\/figure>

4. Quality Control & Testing<\/b><\/strong><\/span><\/h3>

4.1 Mandatory Inspection Regime<\/b><\/strong><\/span><\/h4>

Raw Material Certification:<\/b><\/strong><\/p>

FBE powder: Gel time 30-60 sec @120\u00b0C<\/p>

PU: NCO content \u00b10.5%<\/p>

Process Controls:<\/b><\/strong><\/p>

Surface prep: Sa 2.5 (ISO 8501-1); anchor profile 50-100 \u03bcm<\/p>

Application:<\/p>

FBE: 230\u00b110\u00b0C electrostatic spray<\/p>

PU: Substrate \u2265 dew point +3\u00b0C<\/p>

Final Verification:<\/b><\/strong><\/p>

Destructive Tests<\/b><\/strong>\u00a0(per 4 hrs):<\/p>

Peel adhesion<\/p>

Cathodic disbondment<\/p>

Bend test (2.5\u00b0 bend, no cracking)<\/p>

NDE:<\/b><\/strong><\/p>

Holiday detection (3.0 kV\/mm)<\/p>

UT thickness mapping (\u22641m spacing)<\/p>

Field Joint Requirements:<\/b><\/strong><\/p>

Peel strength \u226550 N\/cm<\/p>

Overlap width \u226550 mm<\/p>

5. Engineering Applications<\/b><\/strong><\/span><\/h3>

5.1 Case Study: Middle East Water Pipeline<\/b><\/strong><\/span><\/h4>

Pipe:<\/b><\/strong>\u00a0DN1200\u00d712 mm with FBE (DIN 30671)<\/p>

Challenge:<\/b><\/strong>\u00a0Sandy soil +50\u00b0C temperature<\/p>

Solutions:<\/b><\/strong><\/p>

Silane coupling agents \u2192 40% adhesion increase<\/p>

IR thermography (\u0394T \u2264\u00b15\u00b0C during curing)<\/p>

Validation:<\/b><\/strong>\u00a085% adhesion retention after 15-yr accelerated aging<\/p>

5.2 Delamination Failure (Sudan, 2015)<\/b><\/strong><\/span><\/h4>

Failure: <\/b><\/strong>Coating blistering at field joints after 3 years<\/p>

Root Cause:<\/b><\/strong><\/p>

Weld slag contamination (adhesion =18 N\/cm)<\/p>

Soil Cl\u207b >500 ppm \u2192 electrochemical corrosion<\/p>

Corrective Actions:<\/b><\/strong><\/p>

Mandatory weld zone blasting (Sa 2.5)<\/p>

Double-layer HDPE shrink sleeves<\/p>

6. Standard Migration & Innovations<\/b><\/strong><\/span><\/h3>

6.1 Current Replacements<\/b><\/strong><\/span><\/h4>
DIN 30671 Coating<\/b><\/strong><\/td>EN Standard<\/b><\/strong><\/td>Key Enhancements<\/b><\/strong><\/td><\/tr>
Liquid epoxy<\/td>EN 10290:2004<\/td>HT resistance to 140\u00b0C; self-healing<\/td><\/tr>
Polyolefin<\/td>EN 10289:2004<\/td>Impact \u226520J @-30\u00b0C; 3PE systems<\/td><\/tr><\/tbody><\/table><\/figure>

6.2 Emerging Technologies<\/b><\/strong><\/span><\/h4>
Innovation Area<\/b><\/strong><\/td>Technology<\/b><\/strong><\/td>Performance Gain<\/b><\/strong><\/td><\/tr>
Eco-Materials<\/b><\/strong><\/td>Solvent-free epoxy<\/td>VOC reduction 95%<\/td><\/tr>
Bio-based PU (castor oil)<\/td>30% renewable content<\/td><\/tr>
Smart Coatings<\/b><\/strong><\/td>Microcapsule self-healing<\/td>>80% damage recovery<\/td><\/tr>
Optical fiber sensors<\/td>Real-time strain\/temperature monitoring<\/td><\/tr>
Application Tech<\/b><\/strong><\/td>Plasma pretreatment<\/td>Surface energy \u219170 dyn\/cm<\/td><\/tr>
UV curing<\/td>Energy \u219340%; speed \u21913\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>

7. Technical Data Summary<\/b><\/strong><\/span><\/h3>
Param\u00e8tres<\/b><\/strong><\/td>FBE Requirement<\/b><\/strong><\/td>PU Requirement<\/b><\/strong><\/td>Norme d'essai<\/b><\/strong><\/td><\/tr>
\u00c9paisseur<\/b><\/strong><\/td>300-500 \u03bcm<\/td>500-1000 \u03bcm<\/td>DIN 30671 \u00a76.2<\/td><\/tr>
Adhesion (Peel)<\/b><\/strong><\/td>\u226550 N\/cm<\/td>\u226570 N\/cm<\/td>ISO 4624<\/td><\/tr>
Impact @23\u00b0C<\/b><\/strong><\/td>\u226510 J<\/td>\u226515 J<\/td>ASTM G14<\/td><\/tr>
Essai de flexion<\/b><\/strong><\/td>No crack @2.5\u00b0<\/td>No crack @2.5\u00b0<\/td>ISO 1519<\/td><\/tr><\/tbody><\/table><\/figure>

Implementation Notes:<\/b><\/strong><\/p>

For seawater exposure, supplement with\u00a0DNV-RP-F106<\/b><\/strong>\u00a0(30 MPa hydrostatic resistance).<\/p>

Hydrogen service requires H\u2082 permeability \u22640.5 mL\/m\u00b2\/day (per ISO 15105-1).<\/p>

Carbon footprint reduction: Electric curing reduces CO\u2082 by 60% vs. gas-fired ovens.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Produits apparent\u00e9s<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\n \n \n <\/i> <\/span>\n \n\t\t\tVoir tous les produits<\/span>\n\n \n \n <\/span><\/a><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\n
\n
\n
\n
\n \n
\"Tube<\/a>