Reactor lead time from China, and what actually drives it

Lead time is the second question every technical buyer asks, and the hardest one to answer honestly. We are KAVORTE, an independent sourcing and engineering office in Zibo, Shandong — the centre of China's glass-lined equipment industry. We do not own a factory. We specify, audit, inspect and ship glass-lined, stainless steel and PTFE-lined reactors from 50 to 30,000 L.

A supplier who answers with a fixed number of days before seeing your drawing is guessing, and the guess will be revised upward once your nozzle layout arrives. A 50 L open vessel with a packed gland is not the same purchase as a 30,000 L closed vessel with a dual mechanical seal, a half-pipe coil jacket and PFA rotational lining. The distance between them is not a rounding error. What follows is what actually moves the date, and how to structure an order so the date survives contact with the workshop.

1. Why the number has to come after the drawing

Nothing in a reactor is stock. The shell is rolled to your diameter, the nozzles are welded where your process needs them, and the agitator and seal are specified as a system because a fast disc turbine loads a mechanical seal differently from a slow anchor. Until that is fixed, the schedule has no fixed input.

So the sequence is: we issue a numbered specification confirmation sheet — design pressure in MPa, design and operating temperature in °C, jacket type, sealing arrangement, nozzle layout, agitator power, internal finish, lining thickness in mm, and the test regime. You approve it in writing. Fabrication starts after that approval, not before. Any lead time quoted before that sheet is signed is a placeholder, and should be treated as one in your project plan.

2. The stages between your enquiry and a vessel on the water

The order of these stages is fixed. The duration of each one is not.

1. Specification freeze. Duty, media, design pressure and temperature, capacity.
2. Drawing approval. Shell and jacket dimensions, nozzle schedule and orientation, agitator and drive, seal type, support arrangement.
3. Material procurement. Plate in carbon steel, 304 / 316L, titanium, duplex, Hastelloy or clad; glass-lining frit; PFA, PTFE, ETFE (F40), ECTFE (F30) or FEP (F46) resin; lapped seal faces.
4. Fabrication. Rolling, longitudinal and circumferential welding, nozzle welding, dimensional check, jacket hydro test.
5. Lining and finishing. Glass lining runs through multiple furnace cycles, so each additional coat is another pass through the furnace. Spray or rotational PTFE-family coating cures in an oven. Hygienic builds go on to GMP mirror polish.
6. Testing. High-voltage test on the glass lining at the specified kV, lining thickness measurement in mm, thermal shock verification against the stated limits (cold shock ≤ 110 °C, heat shock ≤ 120 °C), hydro test on the inner vessel.
7. Inspection and documentation. Material certificates, test records, dimensional report, packing list.
8. Packing and inland haul to port. Cradles, sea-fastening, and in some cases a flat rack or breakbulk booking.

Stages 1 and 8 you influence directly. Stages 3 to 6 are where the schedule lives or dies.

3. Three tiers, and why they do not share a number

Tier A — catalogue-adjacent. Open vessel with removable cover, jacket, packed gland, standard nozzle arrangement, 50 to 1,000 L, in glass-lined or 304 / 316L stainless. The fewest process steps, the least drawing content, the shortest path. If your duty is genuinely simple, this is where the cheaper option is also the correct one.

Tier B — the normal industrial purchase. Closed vessel with integral head, mechanical seal, inner coil, immersion tube or half-pipe coil, disc turbine or hydrofoil agitator, 1,000 to 6,000 L. A 3,000 L glass-lined reactor with a jacket and a mechanical seal is the reference case and lands between $8,000 and $14,000 depending on how it is built. Every build at this tier adds at least one more drawing, one more weld map and one more test.

Tier C — a project, not a purchase. 6,000 to 30,000 L, dual mechanical seal with barrier-fluid circuit, titanium, duplex, Hastelloy or clad shell, PFA rotational lining, non-standard nozzle layout, automation package. There is no catalogue position to start from, the agitator and drive are engineered for the duty, and the vessel may not fit a standard container. Everything that can be revised will be revised if you leave it open.

We do not publish one week count across all three tiers, because that figure would be dishonest. What we commit to is a working-day range for your tier, written against a named configuration on the specification sheet, before you pay anything.

4. Where reactor lead times actually slip

• The specification was never frozen. A nozzle added after shell welding restarts part of the job. This is the single most common cause of a slipped date.
• The seal and agitator were ordered late. They are one decision with the vessel. If the drive arrives after the lining is finished, the vessel sits in the workshop.
• Nobody owns the approval clock. If the buyer holds the drawing for three weeks, those weeks belong to the buyer's calendar, not the factory's. Write the clock down.
• A high-voltage test failure. A lining that fails at the specified kV goes back for re-lining, which is another set of furnace cycles. It is normal for a workshop to take this seriously — you want it to — but it costs time.
• Non-standard flange standards or thread forms. Anything outside the standard series adds procurement of a fitting nobody stocks.
• The Spring Festival window. It affects every Chinese fabricator's calendar and it does not negotiate. Put it into the schedule deliberately rather than discovering it.

5. Six ways to write an order that holds its date

1. Freeze the numbered specification sheet. Approve it in writing, and treat any later change as a variation with its own price and its own date.
2. Define the approval clock. State in working days how long each side has to comment on a drawing revision, and what happens when that time elapses.
3. Pay against hold points, not against calendar dates. Milestones at drawing approval, at shell completion, at successful high-voltage test, at pre-shipment inspection. A payment tied to a date gives the fabricator nothing to protect.
4. Name the agitator, seal and drive as a system in the purchase order. The seal is the component that runs at a clearance against a moving shaft. It is not an accessory.
5. Witness the tests. Third-party inspection (SGS or your own engineer) at the hold points, with the high-voltage test at the stated kV and the lining thickness readings in mm recorded.
6. Ask for the quotation line by line. We break out the six main cost items so you can put our number beside anyone else's. If a competing quotation gives one figure for the vessel and seal together, you cannot see what you are buying, and you cannot see what will delay it either.

6. The leg the factory does not control

Inland haul to Qingdao and the sea freight booking are not workshop activities. A 30,000 L vessel may need a flat rack or breakbulk, and the sailing schedule belongs to the carrier, not the fabricator. Plan this leg separately, and remember that a vessel sitting at the port waiting for a booking looks exactly like a vessel that has not been built.

What to do next

Send your duty: capacity, media, design pressure in MPa, design temperature in °C, jacket type, and whether you need a packed gland or a mechanical seal, with the agitator and drive named. We will send back a numbered specification confirmation sheet and a working-day schedule written against it. Approve that sheet, and the date becomes something you can hold rather than something you hope for.