A purchaser sends the fire-test requirement through the project specification, requisition, valve data sheet, and purchase order. The vendor must connect that requirement to the offered design and its qualification records. The path stops prematurely when “metal seated” is treated as proof of fire performance. Seat material describes construction; it does not document leakage performance after fire exposure.
Where does the requirement path stop?
Two approaches appear in valve procurement: accept a construction-based declaration, or require qualification by an applicable fire-test standard. Only the second approach measures the completed valve’s ability to limit internal and external leakage during the prescribed test sequence.
| Approach | What it establishes | What remains unresolved | Recommendation |
|---|---|---|---|
| Declare the valve intrinsically fire-safe because it has metal seats | The primary seating surfaces are metallic and do not depend on a soft seat | Actual through-seat leakage, pressure-boundary leakage, joint performance, and post-fire operability | Do not accept as a substitute for a specified test certificate |
Provide qualification to API 6FA or ISO 10497
|
A representative valve design completed a defined fire-test procedure with measured leakage | Whether the report covers the offered valve configuration | Use when the purchase documents require fire-tested construction |
Use API 607 as the governing document |
Fire qualification within that standard’s scope for quarter-turn valves and valves with non-metallic seals | Applicability to the offered check valve | Screen the scope first; do not use it as a general exemption from another specified standard |
The recommended path is to retain the project requirement for an applicable test certificate unless the purchaser formally changes the specification. A vendor’s material assessment may support design review, but it does not replace a test required by the contract.
Does a metal seat remove the fire-leakage paths?
No. Follow the leakage path through the complete assembly. A metal seat removes one common heat-sensitive element, but fire performance depends on more than the contact material between the disc and seat.
Internal leakage occurs across the closed seat. Fire exposure can distort the body, disc, hinge arrangement, or seat geometry. Thermal gradients, differential expansion, loss of alignment, oxidation, and debris can prevent full contact even when both seating surfaces remain solid. A valve that seals under ambient shop conditions can therefore leak across the seat after heating.
External leakage follows the pressure boundary. Candidate paths include body-to-cover joints, bolted closures, plugs, seals, and casting or forging discontinuities. The standards identified for this application distinguish internal seat leakage from externally visible leakage. Leakage at the welded valve-to-pipe connection is outside the valve leakage assessment described in the requirement, so the test setup must separate a valve-body leak from a fixture or attachment-weld leak.
“Intrinsically fire-safe” is therefore a construction claim, not a measured acceptance result. Determine fire performance from a traceable test report or certificate whose scope includes the supplied design.
Which fire-test standard follows the offered valve?
Start with the valve type, then inspect sealing construction, and finally apply the standard named by the purchase documents. Do not begin with seat material alone.
| Document | Relevant scope distinction | Decision for a metal-seated check valve |
|---|---|---|
API 6FA |
Addresses valve fire testing and evaluates internal and external leakage | A valid qualification route when invoked by the project requirement and applicable to the offered design |
ISO 10497 |
Addresses valve fire type-testing and does not create a blanket metal-seat exemption | A valid qualification route when invoked and when the report covers the supplied configuration |
API 607 |
Its scope centers on quarter-turn valves and valves equipped with non-metallic seals | Normally not the governing route for a metal-seated check valve with no soft seals; inspect the construction if any non-metallic seal is present |
A statement that API 607 does not apply does not prove that no fire test applies. It answers only the scope question for that document. The project may still require qualification under API 6FA or ISO 10497.
What documents decide whether the certificate is acceptable?
Request the certificate and the supporting test report. The certificate is an index to the qualification; the report supplies the technical traceability needed to compare the tested valve with the offered valve.
| Check | Required comparison | Reject or clarify when |
|---|---|---|
| Standard and edition | Match the project-specified document and edition | The certificate names a different standard or omits the edition needed for contractual review |
| Valve type | Compare the tested valve type with the offered check-valve design | The record covers a different operating or closure mechanism without a documented qualification relationship |
| Design identity | Match the model or design family stated in the vendor’s offer | The relationship between the test specimen and supplied product is missing |
| Construction | Compare body, cover, seat, seals, joints, and other pressure-boundary details | Fire-exposed sealing details differ without engineering justification |
| Qualification range | Check size and pressure-class coverage against the report’s declared range | The supplied valve lies outside that range |
| Results | Review internal leakage, external leakage, and required post-test observations | The report supplies only a pass statement with no traceable results or acceptance basis |
Read exact leakage limits, test pressures, heating requirements, durations, and qualification-extension rules from the specified edition and the report. Do not transfer values from a different standard or certificate.
How should the purchaser resolve the vendor exception?
- Locate the controlling requirement in the project specification, requisition, data sheet, and purchase order. Record the specified standard and edition.
- Ask the vendor to identify the exact basis for “no fire test applicable”: standard scope, project exemption, or construction assessment.
- Obtain a material and sealing-parts list. Check for non-metallic seals anywhere in the pressure boundary or closure system; a metal primary seat does not prove an all-metal assembly.
- If
API 607is cited, compare its scope with the check-valve type and sealing construction. Treat non-applicability to that document as a scope finding, not as acceptance of untested fire performance. - Request an
API 6FAorISO 10497certificate and supporting report when either standard is contractually required. - Map the tested specimen and qualification range to the offered valve. Send every mismatch back as a documented technical query.
- If no applicable qualification exists, require the vendor to test the design, offer a qualified alternative, or submit a formal deviation for purchaser approval.
- Record the final disposition in the bid evaluation and purchase documents so inspection personnel apply the same requirement.
How is the accepted qualification verified?
Verification has two layers. Document review proves that the tested design covers the purchase. Receipt inspection proves that the delivered valve matches the accepted design.
At document review, reconcile the certificate number, report identity, standard, edition, valve type, design family, construction, size coverage, pressure-class coverage, and recorded leakage results. Confirm that both internal and external leakage were evaluated under the cited procedure. Resolve any exclusion concerning the valve-to-pipe attachment weld before accepting the test setup.
At receipt, compare the nameplate and vendor documentation with the approved data sheet and qualification mapping. Inspect the body, cover arrangement, seat description, and sealing parts against the accepted bill of materials. A valid report for one construction does not qualify a delivered valve that contains unreviewed substitutions.
Frequently Asked Questions
Can I accept a metal seat as proof that a check valve is fire-safe?
No. A metal seat identifies a material choice; it does not measure internal seat leakage or external pressure-boundary leakage after fire exposure.
Does API 6FA apply only to soft-seated valves?
No blanket metal-seat exclusion is identified here. When API 6FA is specified and its scope covers the valve, require the corresponding qualification record.
Does ISO 10497 evaluate both internal and external leakage?
Yes. Review the report for through-seat leakage and externally visible valve leakage, while distinguishing valve leakage from leakage at the welded valve-to-pipe connection.
Can I use an API 607 certificate for a metal-seated check valve?
Only after confirming that the valve falls within the certificate and the standard’s scope. API 607 is associated with quarter-turn valves and valves with non-metallic seals, so it is not a general qualification route for every metal-seated check valve.
Does a fire-test certificate alone close the purchase requirement?
No. Match the certificate and supporting report to the delivered valve’s type, design family, construction, size and pressure-class coverage, then complete the final verification by reconciling the received nameplate and sealing-parts documentation with the approved qualification mapping.