Engineering Reference
CIPP curing time as a function of diameter, wall thickness, and method
Cure time directly affects project schedule and unit cost. This reference summarizes typical CIPP curing time ranges by method and pipe geometry. Actual cure time varies with resin formulation, ambient temperature, and equipment; use these ranges for project planning, not specification.
UV Curing Time
UV-CIPP cures rapidly because UV light initiates polymerization at ambient resin temperature. Typical traverse speeds:
- DN200 – DN400: 0.8 – 1.5 m/min
- DN500 – DN800: 0.5 – 1.0 m/min
- DN1000 – DN1500: 0.3 – 0.7 m/min
- DN1600 – DN2200: 0.2 – 0.5 m/min
For a 100m DN500 segment, total UV traverse time is approximately 100-200 minutes. Add 30-60 minutes for setup and cool-down.
Steam Curing Time
Steam curing requires longer total project time but is well-suited for large-diameter and long-segment installations. Typical cure cycles:
- DN300 – DN600: 2 – 4 hours total cure
- DN700 – DN1200: 4 – 6 hours total cure
- DN1300 – DN2000: 6 – 9 hours total cure
Cure time scales with wall thickness — thicker walls require longer steam exposure for through-thickness polymerization.
Hot Water Curing Time
Hot water curing is similar to steam curing but at lower temperatures (typically 60-80°C). Cycles run roughly 1.5-2x the equivalent steam cure:
- DN300 – DN600: 4 – 7 hours
- DN700 – DN1200: 7 – 11 hours
- DN1300 – DN2000: 11 – 16 hours
Ambient Cure
Ambient-temperature curing (no external heat) is uncommon in production CIPP and is reserved for specialty applications. Cure times measure in days rather than hours.
Factors that change cure time
- Wall thickness: Thicker walls = longer cures (cure time roughly proportional to thickness²)
- Resin formulation: Fast-curing variants reduce time but increase cost
- Ambient temperature: Cold ambient slows steam delivery and cooldown
- Liner moisture content: Excess moisture extends cure time
- Catalyst loading: Higher catalyst speeds cure but reduces shelf life
Acceptance Testing
Cure quality is verified post-installation through:
- Wall thickness measurement
- Hardness testing (Barcol or Shore D)
- Specimen extraction and lab testing per ASTM F1216
- Hydrostatic pressure testing for pressure pipelines
For project-specific cure time estimates, send pipe geometry, target wall thickness, and ambient conditions to our engineering team.
