The delivery sequence on this site puts one step before the container: the line is tested on your pipe size, and you can attend in person or send a third-party inspector. The same commitment appears at two points that matter to a buyer:
- After you send a specification, engineers review it, then confirm the mill model, expected line speed and workshop layout, and only then the line is run in before dispatch (see the contact page).
- On every product page, the delivery timeline reads: layout drawings before shipment, run-in on your spec with attendance or a third-party inspector, export packing, then guided installation until the first pipe runs.
The language is deliberate: the test is on your pipe size. That makes the acceptance test something you specify in the purchase order, not something you watch passively. This article turns that step into a checklist you can hand to your engineer or inspector.
Step 1: Anchor the test to the model table
An acceptance test is only meaningful against the limits of the model you are buying. Every table on the product pages lists a diameter range and a wall range per model — for example, on the industrial line the YH-50 row reads Φ25–Φ76 mm with 0.5–4.0 mm wall.
Write the test plan around those two columns:
- State the steel grade. It belongs in the quotation request alongside diameter range, wall thickness, planned monthly output and workshop size.
- State the strip width that matches the finished diameter and wall. The line feeds strip, not pipe, so a valid test needs the coil width, not only the tube size.
- Mark the target diameter and wall as a point inside the model row, not on the edge.
- Add one run at each end of the diameter range. A line that holds tolerance at mid-range can still struggle at the smallest or largest size it is rated for.
For high-frequency lines, the model and gearbox are confirmed from pipe diameter, wall and target speed. Put the confirmed configuration in the test plan next to the sizes — the test verifies that configuration.
Step 2: List the instruments to demonstrate on the run
The source material names specific in-line instrumentation on two lines. Ask that each item be demonstrated on your run and recorded, not merely described.
On the industrial line
The automatic flow runs uncoiling through welding, seam grinding, sizing, annealing, final sizing, straightening, eddy-current testing, inkjet marking and cut-off.
The eddy-current test sits before marking and cutting, with seam treatment and solution annealing upstream — so a defect found there has already passed the processes meant to prevent it.
During acceptance, ask for a short run with the eddy-current station active and confirm where marked pipe goes after the cut.
On the smart precision line
The control system exposes more during a test:
- Weld current tracking. Welding current and peak current are tracked in real time and strip feed is matched automatically. Ask to see current and peak current on the HMI while the line runs, and confirm the feed-matching response.
- Defect detection interlock. Continuous weld defect detection is linked to the control system, with fault alarms, auto stop and fault logging up to 2,000 records.
A useful acceptance check is whether the log holds the test run: ask the operator to scroll the fault history and show entries from your run.
The model tables do not publish a speed figure for the smart or laser lines. Do not build the test plan around a target speed the source does not state for your configuration — test at the speed confirmed in your quotation instead.
Step 3: Separate the tooling check from the line check
The mill can pass while the tooling is the weak point. Treat moulds as their own acceptance item.
Key mould dimensions are inspected 100% before delivery, covering raw material, arc precision, hardness, thickness, base diameter, bore and keyway. Ask for the inspection records for the roller sets in your order, matched to your diameter and profile row.
The tooling and spare parts page also states the mould families by size range — check that the row you need is on the order, not a size that can be adjusted later.
Keep this as a document check. Line acceptance tests the mill; tooling records verify the parts.
Step 4: Agree on records before you travel
Decide now what the acceptance report contains, so the inspector has something to sign:
- Model and configuration exactly as confirmed in the quotation, including gearbox.
- Pipe sizes tested: diameter, wall and the end-of-range runs.
- Material: steel grade and strip width.
- Instruments observed: eddy-current station, inkjet marking, weld and peak current tracking, defect-detection interlock and its fault log, as applicable to your line.
- Tooling record: the 100% inspection sheet for your roller sets.
- Operator observations: short, factual notes on how the run behaved at each size.
The last part of the delivery sequence is guided installation online until the first pipe runs. Note who takes part in the online session and what they need from the acceptance report.
What this source does not publish
No acceptance-test duration, inspection time, lead time or warranty period is stated anywhere in the product or delivery content. Lead time and warranty are confirmed in writing with the quotation. Do not assume a number for these in a purchase order, and do not accept a verbal one — ask for them in the quotation.
Putting the plan in the inquiry
You can shape this acceptance test from the first message. Send diameter range, wall thickness, stainless grade, planned monthly output and workshop size, and ask that the reply state the model row, the diameters and walls you will test at both ends of the range, and which in-line instruments will be shown on the day. Use the contact page for that request.
If you are still choosing between machine classes, start at stainless steel tube mills and bring the model table into the test plan once the configuration is fixed.