Dural — tube and pipe, marked and traceable.

If your drawing gives an outer diameter and a wall thickness (say 12 × 1.5 mm), it is tube. If it gives a nominal bore and a schedule (say 2" Sch 40S), it is pipe. They are not interchangeable even where the numbers look close — the sealing systems and the tolerances are different.

Carbon. 316L is the low‑carbon variant, specified where the joint will be welded, because lower carbon resists sensitisation at the weld. Much of our stainless stock is dual‑certified 316/316L, meeting both specifications at once — the marking on the length says exactly what it is.

Traceability that survives cutting. The OD, wall, grade, standard, heat number and maker repeat along the tube, so a class surveyor or your QA can read the heat number off an offcut and match it to the mill certificate — no bundle tag, no guesswork.

Pick on working pressure: E355 (ST 52.4) is the stronger grade, E235 (ST 37.4) the standard one, and at the same size the stronger grade rates higher. Send us the size and the working pressure and we confirm the wall thickness against the published rating before anything ships.

Yes — ask on the enquiry. The heat number marked on the length is what ties the steel to its certificate, so state the requirement with the order and the paperwork travels with the material.

The standard length is 6 metres, held in Malaysia or Singapore and dispatched same or next working day. Tell us the lengths and quantities you need on the enquiry — one length or a full cutting list is priced by a product specialist within two working hours.

It depends on the line, and the standard on the marking tells you. ASTM A213 is a seamless specification; A269 covers both seamless and welded; A312 pipe comes seamless or straight‑seam welded; and the EN 10305‑1/‑4 hydraulic tube is seamless cold‑drawn. If your specification requires seamless, state it on the enquiry and we supply and certify accordingly.

Yes, where the duty needs corrosion resistance — marine, chemical, washdown — provided the wall thickness suits the pressure and the fittings suit the tube. Send the OD, the working pressure and the fitting system you are using, and we confirm the wall against the published rating before anything ships.

Not on your own authority — if a specification names A213, the tube must be certified to A213, because that is the boiler and heat‑exchanger specification with its own test requirements. Where stock is dual‑ or multi‑certified the marking on the length says so. Send us the specification wording and we supply against what it actually calls for.

The Dural stainless range is TP316 and TP316L — the grades that cover most corrosive duty in this region. If your specification calls for another grade, ask on the enquiry: we quote it from the wider supply range, with the same marking and certification requirements attached.

Clamps built for it — a tube run that vibrates against bare steel brackets wears at every contact point. Our Tubeclo DIN 3015 pipe clamps cover 6 mm to 406 mm, in the same house: send the tube sizes with the enquiry and we quote the runs and the clamping together.

Because the standard is what fixes the tolerances and the testing, not just the size. A hydraulic fitting seals on the tube’s outside surface — ordinary tube with a loose OD tolerance can pass a pressure test and still weep at the ferrule. That is why the order should carry size, grade and standard, and why every Dural length is marked with all three.