API 6FA: Standard for Fire Test for Valves

Reviewed by the Crestflo Engineering Team

> In one line: API 6FA, "Specification for Fire Test for Valves," is the American Petroleum Institute (API) standard that defines the fire-test method and acceptance criteria for API 6A (wellhead and production) and API 6D (pipeline) valves. It proves a valve maintains pressure containment and keeps internal and external leakage within limits during and after a hydrocarbon pool fire, a controlled flame envelope of about 1,400–1,800 °F (760–980 °C) for a 30-minute burn, followed by cooldown and a post-fire operation and leak re-test. For small-bore instrumentation valves, the equivalent fire test is API 607 / ISO 10497; Crestflo offers a fire-safe valve configuration with that documentation on request, EN 10204 traceability and 6–8 week delivery.

Scope note: API 6FA is a valve fire-test standard, it defines how a valve is proven to hold pressure and limit leakage during a fire. It is not a valve type, not a material grade, and it is distinct from API 6A (the wellhead/production equipment specification) and from API 607 (the fire test for quarter-turn, soft-seated valves). On this site, "valve" means an instrumentation valve, not a plumbing or automotive valve.

Request fire-safe valve documentation & RFQ → · sales@crestflousa.com · +1 346 594 9005

Also known as: API 6FA designations & related terms

Specifications, purchase orders and datasheets all write this standard differently. Whatever form you see below, they point to the same API fire-test standard for valves.

API 6FA standard at a glance: attributes

The standard's exact flame-temperature envelope, timings and numeric leakage limits are copyrighted and fixed by the current edition; this page summarizes scope, test method and acceptance logic rather than reproducing the document. Values per applicable standard; customizable to requirement.

What is API 6FA?

API 6FA, "Specification for Fire Test for Valves," is an American Petroleum Institute standard covering the fire-test method and acceptance criteria for valves used in wellhead, production and pipeline service. The American Petroleum Institute (API) publishes it, and it sits within the API 6-series, which governs upstream and midstream valve and wellhead equipment.

API 6FA is a type-test standard, not a design standard. It won't tell a manufacturer how to size a body wall or rate a valve; that job belongs to the base equipment specifications, API 6A for wellhead and production equipment and API 6D for pipeline valves. What API 6FA does is define how a representative valve gets burned, for how long, under what pressure, and how much it may leak before it counts as fire-tested. Pass that test, and the valve is qualified across a defined size and pressure range represented by the sample.

API 6FA proves that a 6A or 6D valve holds pressure containment and keeps leakage within limits during a hydrocarbon pool fire, and still works once things cool down. That matters because a valve on a hydrocarbon line is itself a potential fuel source in a fire. Heat can wreck seats or seals, and an untested valve might leak product right back into the flames, feeding it further.

Is API 6FA the same as API 6A?

API 6A is the equipment specification for wellhead and Christmas-tree components. It defines how the equipment is designed and manufactured. API 6FA, by contrast, is a fire-test method applied to certain valves that fall under API 6A (and API 6D) scope. Put simply: API 6A defines the valve; API 6FA defines how that valve is fire-tested. People search for the two together often, but they do different jobs.

Who publishes API 6FA, and what is the latest edition?

The American Petroleum Institute (API) writes and maintains API 6FA. The 4th (Fourth) Edition gets cited most often in current specifications. API revises its standards on a periodic cycle, so cite the edition named in your project specification and check it against the current API catalog. Contract references vary by edition.

Where can I get the API 6FA PDF?

API Spec 6FA's full text, sometimes searched as the "API 6FA PDF," is a copyrighted, licensed document sold by API and authorized resellers such as ANSI and Accuris. This page summarizes the standard's scope, test method and acceptance logic for engineering reference. It doesn't reproduce or distribute the document itself. For compliance work, buy the current official edition. Don't rely on unofficial "free PDF" copies floating around online; they may well be superseded.

What API 6FA evaluates: containment, leakage & operability

Under API 6FA, a representative valve gets pressurized and then engulfed in a controlled hydrocarbon pool fire while leakage is monitored throughout. The standard evaluates four things:

• Pressure containment, the valve body and pressure boundary must hold pressure through the burn and cooldown.
• Through-seat (internal) leakage, leakage past the closed seat must stay within the standard's allowable limits.
• External leakage, leakage past the body, bonnet and stem seals to atmosphere must stay within limits.
• Post-fire operability, after the fire and cooldown, the valve must still open and close.

The valve doesn't have to come out of the burn unscathed, seats and secondary seals can be sacrificed. What matters is that containment holds, leakage stays within the standard's limits, and the valve keeps working, both during the fire and after it.

API 6FA fire-test method: temperature, 30-minute burn & procedure

API 6FA sets a controlled flame envelope and a fixed burn duration, then moves into cooldown, a post-fire operation check, and a leak re-test. This sequence proves three things: the valve holds its seal through the burn, it survives the thermal shock of cooldown, and it still works once everything settles.

The flame envelope, timings and numeric leakage limits are exact figures set by the current edition of the standard. Values follow the applicable standard and can be adjusted to requirement.

API 6FA acceptance criteria & leakage limits

A valve earns API 6FA when it holds pressure containment, keeps measured leakage inside the standard's limits, and still operates after the fire. Three things get judged.

The API 6FA edition sets the allowable leakage, and it's size-dependent, with units and rates fixed in that standard's own tables. Both internal and external limits get measured against those figures. Since the exact numeric limits are copyrighted, they're summarized here rather than reproduced. Values per applicable standard; customizable to requirement.

Which valves API 6FA covers: API 6A & API 6D

API 6FA governs the fire testing of API 6A and API 6D valves. These are large-bore wellhead, production and pipeline valves, typically gate, globe and check valves with metal or soft seats.

• API 6A valves, wellhead and Christmas-tree valves used in drilling and production.
• API 6D valves, pipeline valves used in transmission and gathering systems.

Because these are large-bore pipeline and wellhead valves, API 6FA is the fire test that applies to them. Small-bore instrumentation quarter-turn valves, the family Crestflo builds, are fire-tested to API 607 / ISO 10497 rather than API 6FA. Both routes prove the same principle (fire integrity), but each is written for a different valve population. Crestflo supplies fire-safe-configured instrumentation valves into oil and gas and offshore service where these standards are specified.

API 6FA edition & current status (API 6D Annex F / API 6A)

The 4th (Fourth) Edition of API Spec 6FA is the version most widely cited, and dealers still keep it in stock through API and authorized standards resellers. Fire-test requirements for pipeline and wellhead valves show up in the base equipment standards too, particularly API 6D (Annex F) and API 6A. That means a project can point to the fire test through API 6FA directly or through the fire-test provisions written into API 6D and 6A. Standards don't stay still, though. They get revised and cross-referenced on a regular cycle. So check which edition is active, and check which citation path your project specification actually names, standalone 6FA, or API 6D Annex F, or API 6A. Then verify it against the current API catalog before relying on it.

API 6FA vs API 607 vs API 598: fire test comparison

API 6FA is one member of a family of API valve standards, and specifiers aren't always sure how it stacks up against its close relatives. For pipeline and wellhead valves, API 6FA is the fire test for API 6A / 6D. API 607, by contrast, covers the fire test for general industrial quarter-turn and soft-seated valves. API 598 is different again: a non-fire pressure and leak test.

API 6FA fires on API 6A/6D pipeline and wellhead valves, gate, globe, and check types, in metal or soft seat. API 607 fires on quarter-turn, soft-seated valves like ball, plug, and butterfly. That's the key distinction between API 6FA vs API 607. Both share a similar flame envelope and a 30-minute burn, and API publishes both standards. What separates them isn't the test method so much as the valve population each one targets. A pipeline gate valve gets qualified to API 6FA. A soft-seated instrument ball valve gets qualified to API 607 / ISO 10497.

API 6FA standards & proof: how fire integrity is documented

A valve's fire qualification is only as good as the paperwork behind it. Under both API 6FA and API 607, qualification comes down to a type test of a representative valve, recorded in a fire-test report that ties the sample tested to the qualified size and pressure range. Buyers ask for that report, not just the phrase "fire-safe." They also want the material and traceability records showing that the valve as built matches the valve that was tested.

Crestflo builds valves to the standard approvals applicable to instrumentation valves, ASME B16.34 and the relevant API valve standards, with EN 10204 3.1 material test certificates (3.2 on request) and a heat/lot number on every part for full traceability. Every valve is 100% seat- and shell-leak tested in house, backed by the full test regime: hydraulic proof, burst and impulse, pneumatic, PMI (positive material identification) and in-house NDT; destructive testing is outsourced to ISO/IEC 17025-accredited laboratories, and third-party inspection is available on request. Crestflo is ISO 9001 / 14001 / 45001 & PED certified.

Fire-safe instrumentation valves from Crestflo

Crestflo builds a fire-safe valve configuration into its quarter-turn and soft-seated instrumentation valves: ball, plug, double block & bleed and monoflange, made in stainless and high-nickel/CRA alloys. Small-bore instrumentation valves call for a different fire-type-test than large-bore ones do: API 607 / ISO 10497 applies here, not the API 6FA regime. Where your spec calls for that qualification, ask the Engineering Team for the relevant fire-test documentation. Conformance gets confirmed against whatever standard your project names, and it's customizable to what you need.

Crestflo valves span 1/16" to 1" with threaded or tube-fitting ends, in imperial and metric sizes, and double-block-and-bleed valves are designed per ASME B16.34. Select a corrosion-resistant alloy for fire and sour service on the materials pages, for example 316/316L for general duty through duplex and nickel alloys for aggressive media; sour service adds NACE MR0175 / ISO 15156 compliance. Certificates and traceability records are held in quality / traceability; the full program is described under testing & inspection.

RFQ, tell us what you need:

• Name
• Company name
• Email
• Phone
• Requirement description (valve type, material, size, rating, quantity, fire-test/service conditions)

Request the RFQ & fire-safe valve documentation →

Secondary paths: browse instrumentation valves · request your part-number cross-reference · become a distributor · contact Crestflo.

US contact: sales@crestflousa.com · +1 346 594 9005 · Houston, TX.

Ready stock covers standard items; specials get made to order. Delivery runs 6–8 weeks. Material is Indian origin, though US or European melt is available on request, with full traceability included.

Where fire-safe valves are required: applications

Fire-tested valves show up wherever a fire could turn a leaking valve into a fuel source: wellheads and production trees, pipelines and gathering systems, refineries and downstream processing, offshore platforms, LNG and fuel-storage terminals, and petrochemical plants. In these services, isolation valves on hydrocarbon lines are routinely required to be fire-safe, so an external fire can't escalate through a failed seal.

Crestflo builds fire-safe-configured instrumentation valves for oil and gas, offshore, subsea, LNG / cryogenic and petrochemical & chemical applications. Alloy and end connections are matched to whatever each service demands.

Why Crestflo for fire-safe valves

The standard is published, not buried. API 6FA's test method, acceptance logic and comparison to API 607 and API 598 are set out here as HTML-native data, and Crestflo offers a fire-safe configuration across ball, plug, DBB and monoflange valves.

A manufacturer, not a reseller. Crestflo makes the valves and runs the tests itself, hydraulic proof, burst and impulse, pneumatic, PMI and NDT, all in house. Destructive testing happens at ISO/IEC 17025-accredited labs, and third-party inspection is available on request.

Traceability on every part. Every part carries an EN 10204 3.1 MTC (3.2 on request) and a heat/lot number. That's the documentary link between the valve and its record.

• Lead time that moves projects. Ready stock for standard items, made-to-order for specials, 6–8 week delivery.
• Honest origin. Indian origin; US / European melt available on request, with full material traceability.
• Full alloy range, both imperial and metric, small MOQ and private label, customizable to requirement.
• Certified quality system: ISO 9001 / 14001 / 45001 & PED certified.

Crestflo is the instrumentation arm of a four-decade-old export house recognized by the Government of India, with a long delivery record across the Middle East. Manufacturing pedigree, focused instrumentation brand, built for the US market. We Engineer Confidence.

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Explore related standards, valves & documentation

Standards: Standards hub · API 607 · API 6D · API 598 · API 602 · ASME B16.34 · ISO 15848 · NACE MR0175 · ISO 15156 · EN 10204 MTC

Valves: Instrumentation valves · Ball valve · Plug valve · Double block & bleed · Monoflange valve

Materials & quality: Materials · 316/316L · Traceability · Testing & inspection

Industries: Oil & gas · Offshore · Subsea · LNG / cryogenic · Petrochemical & chemical