API 607: Fire Test for Quarter-Turn and Nonmetallic-Seated Valves

Reviewed by the Crestflo Engineering Team

API 607, "Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats," is the American Petroleum Institute standard that fire-tests a valve to confirm it stays sealed, within measured leakage limits, during and after a controlled burn. The test engulfs a pressurized valve in flame for a 30-minute soak, then cools it and operates it, measuring external (to-atmosphere) and through-seat leakage against the standard's limits. ISO 10497 serves as its harmonized international equivalent. Crestflo offers a fire-safe valve configuration on ball, plug, double-block-and-bleed and monoflange valves. API 607 / ISO 10497 fire-test documentation is available on request, along with EN 10204 material traceability and 6-8 week delivery.

Scope note: API 607 is a fire-test qualification for industrial quarter-turn and soft-seated valves, it is not a valve pressure class, not a material specification, and not the pipeline-valve fire test (that is API 6FA). On this site, "valve" means an instrumentation valve (ball, plug, double-block-and-bleed, monoflange), not a plumbing or automotive valve. API 607 tests fire performance; a valve's pressure–temperature rating and design come from specifications such as ASME B16.34.

Fire-safe valve documentation and RFQs are available on request. Request them here →, or reach the team directly at sales@crestflousa.com or +1 346 594 9005.

Also known as: API 607 designations & related terms

Specs and datasheets label this standard in several different ways. Every designation below points to the same fire-test qualification standard.

API 607 standard at a glance: attributes

The standard's exact flame-temperature envelope, timings and numeric leakage limits are copyrighted and locked in by the current edition. This page just summarizes scope, test method and acceptance logic; it doesn't reproduce the document itself. Values follow whichever standard applies, and they can be adjusted to your requirement.

What is API 607?

API 607, "Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats," is an American Petroleum Institute standard that qualifies a valve by exposing it to a controlled fire and confirming it still contains and limits leakage during and after the burn. The American Petroleum Institute (API) publishes it. Its harmonized international equivalent is ISO 10497. The two are so closely aligned that datasheets routinely cite "API 607 / ISO 10497" together.

API 607 is a type-test qualification, not a design standard. It does not tell a manufacturer how to size a body wall or rate a valve, that belongs to design specifications like ASME B16.34. Instead, API 607 defines how a representative valve is burned, for how long, under what pressure, and how much it may leak to be judged "fire-safe." A valve that passes is qualified across a defined size and pressure range represented by the tested sample.

API 607 proves that: even after the soft seats are compromised, the valve's secondary metal-to-metal contact keeps leakage within defined limits. That's a core requirement for fire safe valves in oil-and-gas, offshore and LNG service. The standard exists for a simple reason: a fire can destroy a valve's soft (nonmetallic) seats and seals in minutes. Once those seals melt or char, an untested valve can leak fuel straight into the fire and feed it further.

Who publishes API 607, and what is the latest edition?

The American Petroleum Institute (API) writes and maintains API 607. API revises its standards on a periodic cycle; the 7th edition (2016) is the version most widely cited in current specifications, though a later edition also circulates in the market. Check your project specification for the edition it names, then confirm that against the current API catalog, because contract references don't always line up across editions. The standard's lineage runs back to the now-superseded BS 6755 Part 2.

Where can I get the API 607 PDF?

API 607, sometimes searched as the "API 607 manual" or "API 607 PDF", is a copyrighted, licensed document. You can buy it from 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. If you're doing compliance work, purchase the current official edition. Unofficial "free PDF" copies float around online, but they may already be superseded.

What API 607 tests: fire-test method, temperature & 30-minute soak

Under API 607, a representative valve gets pressurized and then engulfed in a controlled fire, with through-seat and external leakage monitored throughout. The sequence proves three things: the valve seals through the burn, survives the thermal shock of cooldown, and still operates afterward.

The valve isn't expected to come through the burn unscathed. Soft seats and seals are meant to sacrifice themselves. What matters is that leakage stays within the standard's limits while the valve is on fire and after it cools, and that the valve still operates. The current edition of the standard sets the exact figures; values per applicable standard, customizable to requirement.

API 607 pass/fail: leakage acceptance criteria

A valve passes API 607 when its measured leakage stays within the standard's limits and it still operates after the fire. Two leakage paths get judged. Operability is checked too.

The allowable leakage depends on valve size and is expressed in the units and rates set by the current API 607 edition; both the external and through-seat limits get measured against those tables. API 607's through-seat allowance is its own size-based figure, separate from the ANSI/FCI 70-2 Class VI seat-leakage class that some fire-safe valve datasheets cite for normal-service tightness. The exact numeric limits are copyrighted, so they're summarized here instead of reproduced. Values per applicable standard; customizable to requirement.

Which valves API 607 applies to: quarter-turn & soft-seated

API 607 covers quarter-turn valves with nonmetallic (soft) seats, chiefly ball, plug and butterfly valves whose seats or seals are made of PTFE, elastomer or another polymer. Fire can destroy the very materials these valves rely on to seal. That's why a fire-test qualification matters here.

Some valve types generally fall outside API 607's scope and get routed to other fire tests:

Check valves generally fall outside API 607's scope. If a project needs a fire-tested check valve, it usually calls for a different standard entirely.

Multi-turn gate and globe valves, along with API 6A and 6D pipeline and wellhead valves, get their fire testing from API 6FA and the related API 6FB and 6FC parts, not from API 607.

Crestflo makes the small-bore instrumentation versions of these in-scope families: ball valves and plug valves, along with double-block-and-bleed and monoflange valves. A fire-safe configuration is available on all of them. See the conformance section below for details.

Fire-safe vs fireproof: what "fire-safe design" actually means

"Fire-safe" does not mean "fireproof." A fire-safe valve is one qualified by a fire test, API 607 or ISO 10497, to keep leakage within limits and stay operable during and after a fire. Damage is expected: soft seats melt or char, and the valve falls back on a secondary metal-to-metal seal to hold tight. "Fireproof" would suggest the valve comes through undamaged and immune to fire. No soft-seated valve fits that description.

A fire-safe design is a valve built with that fallback metal seal and other features, graphite secondary seals and antistatic devices among them, so it can pass API 607. Qualification is a tested outcome, not a marketing adjective. That's why buyers ask for the fire-test documentation, not just the phrase.

API 607 vs API 6FA vs ISO 10497 vs API 598

API 607 is one member of a family of valve standards, and specifiers routinely ask how it differs from its neighbors. API 607 is a fire type-test for general industrial quarter-turn/soft-seated valves. The others cover different valve populations or different failure modes.

API 607 qualifies general industrial quarter-turn and soft-seated valves; API 6FA is the fire test for API 6A and 6D pipeline and wellhead valves, and it's the stricter of the two. A soft-seated instrument ball valve gets qualified to API 607. A pipeline valve needs API 6FA instead. That's API 607 vs API 6FA in a nutshell.

Then there's API 607 vs ISO 10497. These two are harmonized fire type-test standards, with ISO 10497 serving as the international equivalent, and people cite them together often enough that they're practically a pair.

Finally, API 607 vs API 598. API 598 is a pressure and seat-leak acceptance test, and its job is proving the valve seals under normal conditions, nothing more. API 607 adds fire resistance beyond it. Neither one replaces the other; they cover different failure modes, and a valve typically needs to pass both.

API 607 fire-safe valves from Crestflo

Crestflo offers a fire-safe valve configuration on its quarter-turn and soft-seated instrumentation valves, ball, plug, double block & bleed and monoflange, built in stainless and high-nickel/CRA alloys. Where your specification calls for API 607 / ISO 10497 fire-type-test qualification, request the applicable fire-test documentation from the Engineering Team; conformance is confirmed to the standard your project names and is customizable to requirement.

Every Crestflo instrumentation 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. Double-block-and-bleed valves are designed per ASME B16.34, and every part carries a heat/lot number with EN 10204 3.1 MTC (3.2 on request) traceability.

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

Ask for fire-safe valve documentation on your valves →

Where fire-safe valves are required: applications

API 607-qualified valves show up anywhere a fire could turn a leaking valve into a fuel source: refineries and downstream processing, offshore platforms, LNG and fuel-storage terminals, and petrochemical plants. In these services, isolation valves on hydrocarbon lines almost always have to be fire-safe, so an external fire can't work its way through a failed seal.

Crestflo builds fire-safe-configured instrumentation valves for oil and gas, offshore, LNG / cryogenic and petrochemical & chemical work, and each one is matched to the alloy and end connections that the service demands.

Request API 607 fire-safe instrumentation valves

Send your requirement to the Crestflo Engineering Team, valve type, material/grade, size and end connections, pressure rating, quantity, plus any fire-test standard (API 607, ISO 10497) or NACE sour-service target. They'll confirm the fire-safe configuration and documentation for your line.

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.

Stock & lead time: we keep ready stock on standard items; specials are made to order, with delivery running 6–8 weeks. Material is Indian origin, though US or European melt is available on request, with full traceability behind it.

Why Crestflo for API 607 fire-safe valves

• The standard is published, not buried. API 607's test method, acceptance logic and comparison to API 6FA and ISO 10497 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 in house. Destructive testing goes to ISO/IEC 17025-accredited labs, and third-party inspection is available on request.
• Traceability on every part. EN 10204 3.1 MTC (3.2 on request), plus a heat/lot number on every part. 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 record of delivering to the Middle East. Manufacturing runs deep in its roots, yet the brand itself stays focused on serving US customers. We Engineer Confidence.

Frequently asked questions

Explore related standards, valves & documentation

Standards: Standards hub · API 6FA · API 6D · API 598 · API 602 · ASME B16.34 · ISO 15848 · NACE MR0175 · 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 · LNG / cryogenic · Petrochemical & chemical