A practical, data‑first workflow crews can use to cut rework and delays.
First‑pass cures happen when crews can see what the resin is doing at the pipe wall—not just what the boiler or UV console is reporting. Three signals tell the story in time to act: (1) a continuous, location‑aware temperature profile measured at the liner/host interface along the entire reach; (2) pressure at the inversion head and a distal location to confirm uniform support; and (3) the process exposure that drives the reaction—flow/return temperatures and boiler set points for steam or hot water, or irradiance and travel speed for UV. Read together, these curves reveal the advancing heat front, the exotherm crest, and the moment the entire interface profile—not just the invert—crosses the minimum temperature. That is the only defensible point to start your hold. Anchoring this workflow to recognized practice simplifies reviews.
For inversion cures, see the current practice summary here: ASTM F1216.
Owners and engineers often borrow performance‑based structure and acceptance tone from the peer‑reviewed NASSCO CIPP guideline.
Many municipal specifications mirror these expectations; an example is the City of Tulsa’s CIPP spec: City of Tulsa Spec. When your data matches this language—and lives in a governed cloud—approvals move from debate to verification.
A purpose‑built example that unifies sensing, control, and cloud storage is here: CureView.
With the right signals in view, the playbook becomes routine:
Steam or hot water
Ramp‑up: Track the advancing heat front on the interface profile; don’t start the hold until the entire profile crosses your minimum temperature. CureView’s software makes this simple: it tracks the full interface‑temperature profile and clearly marks the point when boiler temperatures come online, so you know exactly when the entire reach has crossed your minimum.
Pressure discipline: Keep head and distal pressure inside the specified window to prevent wrinkles or lifts. A widening gradient is your earliest warning to rebalance valves or remove constrictions.
Hold and cool‑down: Maintain the window while the interface profile stays above threshold for the full duration; avoid premature cool‑down that undercuts bond and structure.
UV cure
Exposure control: Synchronize irradiance and train speed with interface temperature and pressure. If irradiance dips and the interface slope stalls—especially at the crown—slow the train or re‑pass before undercure sets in.
Support: Record head and distal pressure even on UV; a stable window prevents lifts and embossing at transitions.
Across methods, alarms focus attention when seconds matter: minimum interface temperature achieved across the entire profile (start hold), hold‑time compliance, pressure windows, and for UV, minimum irradiance and maximum speed. Remote supervisors and manufacturer reps can assist via a shared cloud dashboard, turning a looming relaunch into a routine save.
For background on why this has become standard QA/QC rather than R&D, see trade coverage: Cure Monitoring Coverage
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Closeout should feel like a screenshot, not a scavenger hunt. With CureView’s cloud software, your closeout package is straightforward: download a sealed PDF final report and the CureMap—a simple, color‑coded spreadsheet showing time and temperature across the entire cure at the liner/host interface—so owners, engineers, and inspectors can read and verify it at a glance.
This is another place where the ROI is obvious. Avoiding a single relaunch can pay for months of instrumentation when you factor in replacement liner and resin, re‑mobilized boilers or UV trains, extended traffic control, extra CCTV and reinstatement, and overtime. Schedule compression multiplies the benefit: precisely timed holds and early corrections keep crews inside traffic windows and pull pay‑app cycles forward.
Near buildings—especially where styrene-based systems are in play—instrumented procedures and transparent records help address air‑quality concerns with authoritative references such as Florida DOH and the EPA Styrene Fact Sheet. And if you’re ready to get rid of styrene and the complaints that come with it, you’ve got options in modern low‑odor resin systems. Data replaces doubt—and approvals move faster.
To see our thoughts on Styrene and why you should speak with us today on alternatives to Styrene, see our coverage: https://www.innovationsam.com/en/news/indoor-air-pollution-from-styrene-a-hidden-threat !!