Every threaded connection made up on a rig depends on a thin layer of compound between pin and box. It decides whether the connection reaches the right make-up torque, whether it seals, and whether the threads survive to be used again. Getting it wrong is expensive: galled threads, leaking connections or a connection that backs off downhole.
A running thread compound lubricates the connection so it reaches the correct make-up torque without galling, helps it seal and protects the threads. API RP 5A3 (also published as ISO 13678) sets how compounds for casing, tubing, line pipe and drill stem elements are evaluated. Each compound has a friction factor: multiply the recommended make-up torque by it. Apply to clean, dry threads and keep the compound itself clean.
| Running (make-up) compound | Storage compound | |
|---|---|---|
| Job | Lubricates and seals during make-up | Protects threads from rust in storage and transport |
| Used when | Every make-up | Pipe in the yard or in transit |
| Before make-up | Applied fresh | Must be cleaned off completely |
A common and costly mistake is making up a connection over storage compound. Its friction is not controlled, so the torque reading no longer means what it should.
API RP 5A3 (ISO 13678) is the recommended practice for evaluating thread compounds for casing, tubing, line pipe and drill stem elements. It covers tests such as friction behaviour, sealing, resistance to galling, stability with water and temperature, and how well the compound brushes on. A compound described as API 5A3 compatible has been formulated against that practice. Banesto's oilfield thread compound is formulated to be API 5A3 compatible and uses metallic and non-metallic EP agents to withstand very high make-up torque and resist washout by drilling mud.
Make-up torque tables assume a reference compound with a friction factor of 1.0. Every compound has its own friction factor (FF), given on its data sheet.
Adjusted make-up torque = recommended torque × friction factor.
For example, if the recommended torque for a connection is 10,000 ft-lb and the compound's friction factor is 1.15, make up to 11,500 ft-lb. If the factor is ignored, the connection ends up under-torqued (risk of leaks and back-off) or over-torqued (risk of damage), even though the gauge shows the "right" number.
In cold weather a compound becomes stiff and hard to brush; in heat it thins. Store buckets out of direct sun, bring them to working temperature before use, and do not thin a compound with oil or diesel. That changes its friction factor.
For the full range of lubricants for rigs, compressor stations and refineries, see our page on oil and gas lubricants.
What is the difference between storage and running thread compound?A storage compound protects threads from rust in the yard or in transit. A running compound lubricates and seals during make-up. Storage compound must be cleaned off completely before make-up.
What is a thread compound friction factor?A number on the compound's data sheet that compares its friction with the reference compound used in make-up torque tables. Multiply the recommended torque by it to get the right make-up torque.
How much thread compound should be applied?Enough to cover all threads and the seal area completely, on the pin and box as the connection maker specifies, with no bare spots and no thick lumps.
Is Banesto's oilfield thread compound API 5A3 compatible?Yes. It is formulated to be API 5A3 compatible. Ask us for the data sheet, including its friction factor, for your evaluation.
Supplying a rig, workover unit or pipe yard? Send us the connection types and the specification you work to, and our team will match the right thread compound with data sheets.