A stockist in Dubai buys flanges from one mill in Cangzhou, elbows from a second, tees from a third, gaskets from a fourth. Four factories, four invoices, one 40ft container into Jebel Ali.
The container clears. The file is what gets held.
Before the paperwork, one thing decides most of it: a bill of lading carries one shipper. Either one exporter collects the four factories’ goods and ships them under its own name, or a forwarder takes four consignments and issues four house bills against one master bill.
On the first structure the file has to be built by hand. On the second it arrives as four sets of papers, each consistent with itself, and the work is checking that the four agree with one another. Both are common. What follows is written for the first, because that is where the avoidable errors sit, and half of it still applies to the second.
One invoice for customs, four factory invoices in the drawer
The invoice that goes to customs is the consolidated one, not the four that arrived in your inbox.
Group by supplier: Group A lines 1 to 6, Group B lines 7 to 11, Group C from line 12. Each group states the supplier, the heat numbers and the piece count.
The reason sits in the certificate of origin. A CO is issued to one exporter against one invoice number. A company that is the shipper cannot hold four certificates, one per factory, against a single export invoice. Either the invoice is consolidated into one number, or the certificate has nothing to point at.
Keep the factory invoices. They are the answer if the declared value is questioned. They are not what you submit.
HS 7307.91 is flanges. 7307.93 is butt-weld fittings.
| Product | HS code |
|---|---|
| Carbon steel flanges, ASME B16.5 and B16.47 | 7307.91 |
| Carbon steel threaded elbows, bends and sleeves | 7307.92 |
| Carbon steel butt-weld elbows, tees, reducers, caps | 7307.93 |
| Stainless steel flanges | 7307.21 |
| Stainless steel butt-weld fittings | 7307.23 |
| Fittings outside the five above | 7307.99 |
The 7307.9x group is carbon and alloy steel. Stainless sits in 7307.2x, in the same order: flanges, threaded, butt-weld. A container carrying both is normal, and it is the second reason the code has to be set line by line rather than per container.
Four suppliers usually means four brokers in China, and every broker has a default. The default is 7307.99 for anything that is not obviously a flange.
A manifest carrying 7307.91, 7307.93 and 7307.99 against one container reads as three products of uncertain description. Dubai Customs can ask for a corrected declaration, line by line. There is a fee, and the box waits until the amended entry clears.
Settle it on the invoice: one line, one code. 7307.99 only where the part genuinely falls outside the other three.
Dubai accepts the eight-digit code. Oman does not. Since 1 January 2025 Bayan runs on the twelve-digit GCC tariff and rejects a shortened entry outright, which is one more reason the code has to be fixed before the invoice is signed. What an Oman import entry actually requires follows that file through the port.
The heat number belongs on the invoice line
A 3.1 certificate describes one heat. Four suppliers give you four heat numbers at minimum, and usually more.
Write the heat number against every line. A line reading “carbon steel flanges, ASTM A105” cannot be matched to any certificate in the file.
An inspector follows the same sequence every time. The stamp on the part, then the same number on the 3.1, then the same number on the invoice line. Break the chain at the invoice and the box is set aside while the container waits.
Reissuing costs more than the delay. The mill cannot issue a certificate until the heat is identified from the stamp. On a mixed container that means a photograph of the stamp, a call to the works, and a day gone.
Reading the stamp itself, character by character, is covered in how to read a flange and fitting stamp.
Freight splits by value, not by weight
One bill of lading, one freight charge, four invoices. The freight has to land somewhere, and how you land it changes the CIF on every group.
Split by FOB value. A group worth 12% of the goods carries 12% of the freight. That is the split that survives a query on one group without pulling the other three into it.
Split by weight and the expensive light lines under-carry: stainless, small bore, gaskets, studs. The CIF on that invoice then sits below what the valuation database holds for the same description.
Freight into Jebel Ali has been the largest single line on the landed cost through 2026, so the error scales with the market. The freight figure moves monthly; the split does not. How the freight behaves against duty is set out in our note on why the freight quote is not the landed cost.
If the goods go out again, declare it at entry
Duty is 5% of CIF at entry. Duty paid on goods that leave again in the same condition can be recovered. The window is the one place in this article where the rulebook and the counter do not read the same.
The GCC Common Customs Law allows the goods to leave within a year, with the claim filed within six months of export. Dubai Customs practice notes are commonly read as six months from the import declaration. Both are quoted in this trade, and they are not the same date. Ask your clearing agent which one is being applied before you build a margin on the refund.
Either way the clock starts before the goods move. Stock that sits three months waiting for a buyer has less room than the calendar suggests.
The claim needs the exit certificate, the re-export declaration, the outbound bill of lading and the invoices for both legs. Without the exit certificate there is no claim at all.
Two cleaner routes. Lodge a deposit or guarantee at entry instead of paying duty, which is the route built for cargo imported specifically to be re-exported. Or store in a designated zone such as JAFZA and move the goods out only when they sell.
Inside the fence there is no duty. The 5% starts when the box crosses into the mainland.
A correction made after entry runs against the corrected figure. A correction made after the goods have left has nothing to attach to.
First-time importers into the Emirates will find the clearance document set on our Export to UAE page. The invoice and the CO are two of the four items on it, and they are the two this article is about.
Six things to settle before the box is booked
- One customs invoice, grouped by supplier, carrying a single invoice number for the certificate of origin.
- One HS code per line, in the right family: 7307.9x for carbon and alloy steel, 7307.2x for stainless. Not 7307.99 by reflex.
- Heat number against every invoice line.
- Freight split by FOB value, and the split shown on the invoice.
- Packing list numbered to the invoice lines, boxes marked INV-xxxx / Line 07.
- If the cargo is for re-export, say so before the declaration is filed.
None of the six costs anything while the order is being placed. All six cost money at the port, which is the only place they cannot be fixed.
We supply carbon steel flanges to ASME B16.5 and butt-weld fittings to ASME B16.9 from Cangzhou, and we draw the invoice the way the container will be declared: grouped by supplier, one HS code per line, heat number against every line, 3.1 certificate for every heat.
Send the list you are consolidating. Sizes, pressure class, quantity, and how many factories it comes from. We will tell you where the file will break before the box is booked.
Mingyang Pipe Fittings
https://mingyangpiping.com