What Coating Records a Supplier Should Provide
Created on Today
What Coating Records a Supplier Should Provide
Of all the quality records, the coating records are the most decisive for a GFS or enamel tank, because the coating is what fails first.
A supplier should provide a per-panel coating log with grade, furnace curve, holiday-test voltage and result, thickness, and adhesion, keyed to each panel, this is the coating-specific proof that the surface you rely on was made and tested correctly.
Coating records are the subset of quality documentation specific to the tank's protective surface: the enamel or lining system, its application, testing and traceability.
Key Characteristics, Components & Types
Per-panel coating log: Each panel's grade and test identity.
Furnace curve: The 820-930 C firing profile proving vitrification.
Holiday test: Per-panel spark-test voltage and pass/fail, the key continuity check.
Thickness: Coating build per panel within grade.
Adhesion: Pull-off result confirming the bond.
Grade specification: Which grade was applied to which zone.
Applications & Use Cases
Acceptance and life-cycle verification of GFS, enamel and lined tanks, especially in corrosive or gas-tight duty where coating integrity decides life.
Technical Considerations
These records are the coating's birth certificate. The holiday log is the single most important field, it shows every panel was continuity-tested at the correct grade voltage (900-1500 V). The furnace curve proves the enamel was fused, not merely painted, and the grade specification must match the zoned duty (gas zone vs submerged). Require all of this keyed to panel identity, not batch averages, and store it as the baseline for future inspection and any warranty claim.
This is the coating-specific slice of the broader quality records; the structural calculation and bolting specs sit alongside it.
Advantages & Limitations
Advantages:
Complete coating records prove the surface was made and tested to grade, support warranty, and give a precise baseline for re-inspection decades later.
Limitations:
They require supplier discipline to produce per panel; vague or batch-level records hide non-conformities. Hold acceptance against delivery of the complete set.
Comparison & Selection Guide
Coating record | Proves |
Per-panel log + grade | What was applied, where |
Furnace curve | Enamel fused (820-930 C) |
Holiday test | No coating break |
Thickness / adhesion | Build & bond in grade |
Best Practices & How to Choose
Require per-panel coating logs with grade, furnace curves, holiday voltage/result, thickness and adhesion, all keyed to panel identity. Confirm the grade matches the zoned duty, and hold acceptance against the complete, legible coating record set.
A supplier should provide per-panel coating records: grade, furnace curve, holiday test, thickness and adhesion, keyed to each panel. These are the proof that the coating, the part that fails first, was made and tested to specification.
Frequently Asked Questions (FAQ)
Why are coating records the most important?
Because the coating is the component most likely to fail in corrosive or gas-tight duty; its records prove the surface was made and tested to grade, unlike structural steel which is more forgiving.
What is the single key coating field?
The per-panel holiday-test log: it shows every panel was continuity-tested at the correct grade voltage, the direct proof there are no coating breaks.
Why per-panel, not per-batch?
A tank fails at its worst panel; per-panel records let you find and address a specific non-conforming panel and establish a true baseline.
What proves the enamel was fused?
The furnace firing curve showing the 820-930 C window, paired with the holiday test confirming an unbroken coating.
How do I use these records later?
They are the baseline for future inspection, panel identification and any warranty claim, so store them with the as-built documentation.
WhatsApp