Oilfield hose: API 7K, 16C, 16D and 17J, and which hose each one governs

Rig hose is not one category with different pressure ratings. Separate API specifications cover separate duties, each written around a different failure — a rotary hose whipping on the drill floor, a choke line containing a kick, a BOP control line burning. The engineering, the testing and the paperwork differ with each, and so does the margin between working pressure and failure. This guide maps the hose on a rig to the standard that governs it, with the figures from our listings, and links to the detail.

/01Which standard governs which hose.

The three main rig standards are compared in API 7K, 16C and 16D: which standard governs which hose.

/02API 7K: rotary and vibrator hose.

The rotary hose is the largest flexible item on most rigs. Our API 7K rotary and vibrator hoses are all 5,000 psi working with a 12,500 psi minimum burst, 2" to 5", and differ by coupling method — bonded, crimped or swaged, set at manufacture and not a field choice — and by liner: oil-resistant NBR for mud, cement-resistant NBR for cementing, and HNBR for high-temperature and sour service to +121 °C with NACE MR-0175. The mud booster hose is a separate construction at 3,000 psi. Restraint is part of the installation. See API 7K rotary and vibrator hose.

/03API 16C: choke, kill and well control.

Choke and kill lines contain a well, and they are engineered closer to their limit than a hydraulic hose. Ours are all 10,000 psi working with a 15,000 psi minimum burst; the specification conversation is about temperature and medium, which is what the liner decides — polyamide to 100 °C or, in the heat-resistant grade, 130 °C; Tauroflon fluoropolymer to 130 °C with NACE MR-0175 for sour wells. Sour service applies to the whole assembly, flanged ends included. See API 16C choke and kill lines.

/04API 16D: hose that must work in a fire.

BOP control hose has a second requirement on top of pressure: it must still operate the stack while the rig is burning. Our Fireshield 5000 BOP control hose is rated 5,000 psi and listed to survive 704 °C (1,300 °F) for 30 minutes per API Spec 16D and API RP 17H, demonstrated by the ISO 15540 fire test. The Megashield 5000 assemblies carry the same 16D and ISO 15540 basis from 1/4" to 2". See BOP control hose fire resistance.

/05Subsea, well service and offshore motion.

Below the LMRP, API 17J with ISO 13628-2 takes over: our subsea LMRP hoses for choke, kill and hydraulic conduit are rated 15,000 psi with HNBR or FKM liners and corrosion-resistant armour, and the subsea hydraulic conduit hose 5,000 psi. Around the well, stimulation, acidizing and frac hoses run at 15,000 psi, the well test production hose at 10,000 psi for sour service, and the burner and flare boom hose at 5,000 psi to +200 °C — see well service and stimulation hose. On floating rigs, riser tensioner and drill string compensator hoses cycle all day — see riser tensioner and compensator hose.

/06Low-pressure rig hose.

Most hose on a rig is not pressure-control hose at all: drill water, potable water, fuel, mud and oil, and bulk material at 300 to 400 psi. Our Black Gold series covers each in discharge (D) and suction-discharge (SD) form — the SD versions with a helical wire for suction — from 1" to 6", −40 to +82 °C, with a potable water grade listed as NSF 61 / FDA-compatible. The Flameshield low-pressure hose adds a flame-resistant cover at 250 to 500 psi. Rated for far less, these still need the right compound for the fluid and the right coupling.

/07Thin margins, strict inspection.

A hydraulic hose is built to a 4:1 design factor. API 7K rotary hose sits at 2.5:1 between working pressure and minimum burst on our listings, and API 16C choke and kill lines at 1.5:1. That is deliberate: the margin that is not in the design comes from inspection, pressure testing and recertification on schedule, and from handling discipline on the rig. A higher-rated oilfield hose is not a more forgiving one.

/08Documents are part of the product.

On oilfield orders the paperwork is part of the goods: an assembly without its pack cannot be installed, and most of the pack cannot be reconstructed afterwards. Specify the documentation clause with the enquiry — test certificates, material certificates, NACE statements, traceability — alongside the engineering. See the oilfield hose document pack, NACE MR0175 documentation and rig-site hose replacement.