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You are about to wire a large deposit to a company you have never met, for a line that has to hold a diameter and a wall thickness every shift. The brochures all look the same. Every tube mill manufacturer says the same words about quality and service. What you need is proof you can check before the money moves, not a promise you test after the machine arrives.
We work on the sales and pre-sales side, and we would rather answer hard questions early than smooth them over. This checklist is the one we use when a buyer asks how to tell a real factory from a trading desk with a good website. We put drawings, test records and contract terms on the table, and we tell you plainly which numbers we cannot publish. Use it on any supplier, including us.
A factory visit tells you a building exists and machines are being assembled. It does not tell you whether the line will hold tolerance on your strip, or whether the quote covers the crane and the cooling water system. Buyers have found the electrical scope outside the price only at commissioning. A photo of a workshop is not a capability record.
What a visit cannot show is the paper trail. You cannot watch a drawing review, you cannot see a welding seam intermediate annealing step in a handshake, and you cannot measure after-sales response from a conference room. Ask for them before you travel, and you will spend the visit checking real parts instead of being shown a showroom.
We are not saying skip the trip. We are saying arrive with a list. If a tube mill manufacturer cannot send a foundation drawing, a test record and a spare parts list before you board a plane, the visit will mostly be a tour. Start with our company page and ask for the documents behind it.
Before an order we hand over a drawing set, not a catalogue. We review the layout drawing with you, mark the strip flow from coil loading to storing, and fix the level baseline the foundation has to meet. Precision machining of the roll tooling follows that drawing.
You also get a technical requirements form. Our quote form asks for detailed technical requirements, and we design and quote accordingly. That means your coil width, wall thickness, target outside diameter, material grade and the tube standard you sell against. If any of those are missing, the number we send is a guess.
We list the process steps in writing too: uncoiling, strip end joining, accumulating, forming, H.F. welding, scarfing, eddy current testing, sizing, ultrasonic testing, hydrostatic testing and packing. That sequence is for reference and we customise it. You can cross-check the terms against our factory and service scope, then ask any supplier to put their own sequence on one page; the gaps show up fast.
Most enquiries start with a size that is not in any table. A buyer needs a round tube outside the published range, or a square section with a wall the standard tooling will not hold. Our published models are for reference and can be customised according to requirements, so we begin from your strip data and work back to the roll pass design.
Here is the part we will not promise on a phone call. If you ask for a diameter, wall and speed combination we have not built, we say so. We ask you to confirm the material, and the standard such as EN, ASTM, JIS, DIN, GB or API that the buyer will specify against, plus the tolerance band. Those are standards a line can be specified against, not a certification we claim to hold.
A non-standard size ends up as a revised drawing, a tooling list and a fresh test plan. A supplier who agrees to any size with no follow-up questions is a warning, not a service.
We run a performance test before shipment, and buyers often read that as a full production trial. It is not. A pre-shipment run checks that the line assembles, that the drives turn in sync, that the H.F. welder brings the strip edges to welding temperature and the squeeze rolls close a consistent seam on a real coil, and that a tube leaves the sizing and straightening sections within the agreed band.
What it cannot prove is your own mill. Your operators, coil quality, cooling water and power supply are not on our floor. We record the coil we used. Ask for the record and the coil specification, not a video clip edited down to a few clean seconds. The engineering behind each station is explained in our technical article library.
Eddy current testing, ultrasonic testing and hydrostatic testing sit in the process at fixed points. A performance test confirms those stations are live. It does not replace your incoming acceptance plan once the line is erected in your plant.
After-sales is where brochures and contracts part company. We publish installation, commissioning and training, remote commissioning with fast fault diagnosis, a local service center, online after-sale service around the clock and fast spare parts supply. They only protect you when they are written into the contract with a response path and a named contact.
Be specific about the edges. Who supplies the first set of rolls and impeder cores? What counts as a consumable and what counts as a warranty item, to be confirmed in writing? We do not publish a warranty period, and we will not invent one for a signature. Put the boundary in the document, not an email.
Our H.F. welder set runs on a PLC with interlock control and fault diagnosis, and the running state is monitored through an HMI. That gives remote support something concrete to read. A supplier who cannot describe the diagnostic path cannot promise fast fault diagnosis.
If we sat on your side of the table, the first red flag is a quote with no technical requirements behind it. The second is a tube mill manufacturer who answers every custom question with an immediate yes. Real engineering has follow-up questions, because strip width, wall and speed constrain each other.
Watch the numbers that appear from memory. If someone gives you welder power in kW, a frequency in kHz, an efficiency percentage or a delivery time in days without a document, treat it as noise. We do not publish those figures, and anything we cannot put in writing we mark to be confirmed in writing. A confident number with no source is worse than an honest blank.
The last flag is scope drift. Ask whether foundation, cooling water, air source, hydraulic, dust removal and crane are inside the line or outside it. Integral solutions are part of what we offer, but the boundary has to be a list. Get the list.
Two quotes are only comparable when they describe the same machine. Send every supplier the same strip data, the same tube standard, the same product mix and the same list of what is inside the scope. A cheaper quote that omits the cold flying saw, the eddy current tester or the hydrostatic testing station is not cheaper, it is smaller.
We ask buyers to score each supplier on what can be verified in writing against what is only said out loud. A document beats a promise every time, and a tube mill manufacturer who accepts that scoring is usually the one you can work with for years.
Supplier evaluation matrix: what you can check vs what you are told | |||
Check item | What we put in writing | Verbal promise only | How you verify it |
|---|---|---|---|
Foundation and layout drawing | Drawing review with dimensions and a level baseline | We will send drawings later | Open the file and check the datums |
Pre-shipment test | Performance test record with the coil used | It runs well, trust us | Read the record, not a clip |
Non-standard size | Customised proposal against your strip data | Any size, no problem | Send your exact O.D and wall first |
After-sales terms | Online support and a local service center named in the contract | We are always here | Read the clause, not the email |
Welder power rating | To be confirmed in writing | Best welder on the market | Reject any kW or kHz figure from memory |
Scope boundary | Foundation, cooling water, air, hydraulic, dust and crane listed | Integral solution, all included | Get the inclusion list |
Do the scoring before you negotiate price. Once the baselines match, the remaining difference is commercial, and you can argue about it clearly. Send the same brief to our contact page and to every other supplier, then compare the replies.
Capability is not a feeling you get from a website. It is a stack of drawings, a test record, a scoped contract and a supplier who answers a hard question without reaching for a number. We would rather you check us on all four than take our word for it, because a line that misses tolerance costs far more after it ships than a slow enquiry costs before it.
If you are shortlisting a tube mill manufacturer, start with the documents, not the price. We are Shijiazhuang FAITH Machinery Co., Ltd., and we publish our process, our service scope and the boundaries of both. Anything we cannot put in writing, we say so. Send your strip data and your product list, and we will show you exactly what we can prove before you buy.
Ask for a layout drawing with a level baseline, a technical requirements form filled with your strip data, a list of what is inside and outside the scope, and a pre-shipment test plan. We send these before an order. A supplier who only offers a proforma invoice is asking you to buy a promise, not a machine you can check.
Yes, as a design job. Our published models are for reference and can be customised according to requirements. We start from your coil width, wall thickness, outside diameter, material and the standard the buyer will specify against, then revise the drawing and tooling list. What we will not do is confirm any size instantly without those inputs.
No. It proves the line assembles, the drives run in sync, the H.F. welder closes a consistent seam on a real coil, and a tube leaves the sizing section within the agreed band. It cannot replicate your operators, your coil quality, your cooling water or your power supply. Keep your own acceptance plan for after erection and commissioning.
We do not publish welder power in kW, welding frequency in kHz, efficiency percentages, scrap rates, delivery times in days, prices, warranty periods or customer names. Where a figure is not published, we write to be confirmed in writing. If a supplier gives you those numbers from memory with no document, ask where they came from before you rely on them.
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