Industry sheet · upstream, terminal & gas
Oil & gas.
The industry that writes the most demanding valve specifications — and expects the paperwork to match.
- Sour
- NACE MR0175 / ISO 15156 material limits, where the line names H₂S
- Fire-safe
- API 607 or API 6FA type-tested design, where the spec asks for it
- Pipeline
- API 6D for pipeline valve duty; API 600 for refinery gates
- Note
- Published reference designations only — your PO and the current edition govern
Oil and gas services put valves against hydrocarbons, pressure and — in sour fields — hydrogen sulphide, so specifications lean on API standards, fire-safe design and NACE MR0175 material limits. NF Teguh is a Petronas registered vendor supplying gate, globe, ball, plug, butterfly and check valves for Malaysian upstream, terminal and natural gas services. This page covers what oil and gas enquiries typically state and why.
What makes oil and gas duty different
Three things separate an oil and gas valve list from a general-industry one. The medium: hydrocarbons — flammable, sometimes sour, often carrying sand or wax — so sealing integrity and material selection carry more of the specification than they do on a water line. The pressures: wellhead and pipeline classes run high, and the class-by-temperature arithmetic of ASME B16.34 gets exercised in earnest. And the consequences: a passing leak on a hydrocarbon line is a safety event, not a housekeeping one, which is why this industry leans on type-tested designs and documented testing rather than on catalogue assurances.
The result is a specification culture built on API standards and named paperwork. NF Teguh supplies all six valve families — gate, globe, ball, plug, butterfly and check — into Malaysian oil and gas, terminal, offshore and natural gas services, quoted against exactly that culture: state the standard your line works to, and the quotation answers in the same language.
Sour service and material limits
Where produced fluid carries hydrogen sulphide, ordinary high-strength steels can fail by sulphide stress cracking — brittle fracture at stresses the material would otherwise shrug off. NACE MR0175 / ISO 15156 exists to prevent exactly that: it limits which materials, at which hardness, in which condition, may sit in sour service. When a valve line names it, the requirement reaches the whole assembly — body, trim, bolting and any welds — not just the shell.
On an enquiry, sour service is a single decisive line: “NACE MR0175 applies.” Write it per line item, because a sour manifold and a sweet utility header often share one requisition. What the designation actually demands of each part — and what it costs to over-apply it where it is not needed — is unpacked in the sour service memo.
Fire-safe requirements
Soft-seated valves — most ball and some butterfly patterns — seal beautifully until a fire destroys the polymer seat. A fire-safe design limits the leakage that follows: metal secondary seats take over as the soft seat burns away, and the stem and body joints stay tight enough to keep the line from feeding the fire. The claim is proved by type test, not by drawing review — a production-representative valve is burned under standard conditions and its leakage measured.
Two designations carry the requirement: API 607 for quarter-turn soft-seated valves, API 6FA for the fire test of valves in the API 6A/6D world. Which one a specification should name — and what the certificate that answers it actually looks like — is the subject of the fire-safe memo. On the enquiry, name the designation your spec names; “fire-safe” alone leaves the question open.
Typical valve selections by system
The same six families recur across the industry, sorted by system. Separation and processing trains run on gate valves for block duty and globes where flow is regulated. Metering and export lines want the tight, fast shutoff of ball valves — trunnion-mounted as size and class climb — with check valves guarding pumps and compressors. Tank-farm manifolds at terminals mix gates with large-bore butterflies, where weight and price per inch matter. Dirty, waxy or abrasive streams are where plug valves earn their keep. Offshore topsides run the same logic under a weight budget.
None of this replaces your line list — it is the pattern the counter reads behind one. A selection that departs from it usually has a reason, and stating that reason on the enquiry gets the right alternative quoted first time.
What an oil and gas enquiry states
- Size & pressure class, per line
- End connection & flange standard
- Body & trim material
- Sour service — state if NACE MR0175 applies
- Fire-safe — name API 607 or API 6FA if required
- Test & certification required
- Design std
- Name it where your spec does — API 600, API 6D, BS 5351 and kin
- Service
- Fluid, temperature, H₂S if present — the three facts behind every material answer
- Route
- How ordering works, in three steps
- Counter
- Phone, email or WhatsApp
Paperwork this industry expects
Oil and gas procurement runs on documents, and the habit is sound: EN 10204 3.1 material certificates for pressure-retaining parts, API 598 test reports for the finished valve, and — where the specification asked for it — the fire-safe type-test certificate against the named designation. All of it is cheap to require on the purchase order and slow to reconstruct afterwards, so the rule is the industry’s own: name the papers with the order. The full picture — who issues each document and the PO wording that secures it — is in the procurement documentation guide.
API, NACE, ISO and EN designations on this sheet are published reference data, not a claim about any particular valve or certification — confirm against the current edition; your purchase order governs.