Defective Pipe Shipment Claim: Deadlines Importers Miss

The practical consequence: on the day of discharge you act for the carrier clock, because it is the shortest and the most easily lost. Within the same week you act for the seller clock, because a reasonable time under CISG Article 39 is measured from when you discovered or ought to have discovered the problem — and a buyer who left a container unopened for six weeks will be told he ought to have discovered it sooner.

Hour Zero: What to Do Before the Truck Leaves

Hague-Visby Article III rule 6 requires that notice of loss or damage and its general nature be given in writing to the carrier or his agent at the port of discharge before or at the time of the removal of the goods into the custody of the person entitled to delivery. In plain terms: the moment you take the goods without writing anything down, you have handed the carrier a presumption that they were delivered in good order.

This is the single cheapest and most frequently skipped step in the whole process. It costs one sentence written by hand on a delivery receipt, and it is worth more than every photograph taken afterwards.

• Write the exception before you sign anything. Not "damaged" — that is too vague to help. Write what a stranger could verify: "Container seal intact. 14 cartons crushed on door end, 3 cartons water-stained, PP-R pipe visibly deformed in 2 cartons. Full inspection and rights reserved."
• Photograph the seal and the seal number before it is cut, then the doors open with the load in place, then the damage. A seal number matching the bill of lading tells you the damage happened in transit rather than after stuffing; a broken or substituted seal changes the entire theory of the claim.
• Record the container number and the Equipment Interchange Receipt condition. If the container itself has a hole, a failed door gasket or a damaged roof, that is the causation evidence your insurer will ask for, and it disappears when the box is returned.
• If the damage is not apparent at removal, calendar the three-day deadline immediately. Pipe stacked in the middle of a container often cannot be assessed on the quay. Three days from removal is the window in which written notice preserves your position — not the five to fifteen days quoted by domestic-trucking guidance.
• Do not discard, repair, resell or return anything. The cargo is the evidence. Insurers routinely reject claims where the damaged goods were disposed of before a surveyor could attend.

Build the Evidence Pack Before You Move the Cargo

Every party you will deal with — carrier, seller, underwriter, and possibly a court — asks for the same underlying material. Assembling it once, immediately, is far cheaper than reconstructing it in three months when the container has been returned and the pipe has been moved to a second warehouse.

One more reason to treat the evidence pack as a same-day job rather than a weekend one: under ICC (B) and (C) the burden of showing a listed peril sits on you, and the two facts that carry that burden — the condition of the container and the position of the cargo inside it — both disappear the moment the box is emptied and returned. A surveyor who arrives after the pipe has been moved to a second warehouse can describe damaged goods; he cannot say how the water got in. That is the difference between a paid claim and a declined one.

What Actually Counts as a Defective Pipe Under ISO 15874

"The pipe is bad quality" is not a claim. "The pipe does not conform to ISO 15874-2:2013 clause 6.2.2" is. The value of the standard in a dispute is that it converts an argument about quality into a measurement anyone can repeat, and CISG Article 39(1) specifically requires your notice to specify the nature of the non-conformity.

The most useful thing to understand about the dimensional requirements is that the wall thickness tolerance has no minus component. Table 9 of ISO 15874-2:2013 expresses the tolerance in the form +x mm: from a minimum wall of 1,0 to 2,0 mm the tolerance is +0,3 mm, from 2,0 to 3,0 mm it is +0,4 mm, from 3,0 to 4,0 mm it is +0,5 mm, and from 4,0 to 5,0 mm it is +0,6 mm. There is no allowance below the minimum. A pipe measuring under its minimum wall is non-conforming, and that is a caliper reading rather than an opinion.

Two other checks need nothing but a caliper and the printed marking. Mean outside diameter for dimension class A runs from the nominal to nominal plus 0,3 mm — DN20 pipe measures 20 to 20,3 mm, DN25 measures 25 to 25,3 mm, DN32 measures 32 to 32,3 mm. And any PP-R pipe intended to be joined by fusion must have a minimum wall thickness of 2,0 mm regardless of what S-series is printed on it. Thin-wall pipe sold for socket fusion below that figure fails the standard on its face.

Check	ISO 15874-2:2013 requirement	Can you prove it in a notice window?
Marking	ISO 15874, maker's name/mark, diameter × wall, dimension class, material, application class with operating pressure — at least once per metre, legible without magnification	Yes — a photograph, same day
Wall thickness	Tolerance is plus-only (+0,3 mm for emin 1,0–2,0 mm; +0,4 mm for 2,0–3,0 mm). Fusion pipe: 2,0 mm minimum	Yes — caliper, same day
Mean outside diameter	Class A: DN20 = 20–20,3 mm; DN25 = 25–25,3 mm; DN32 = 32–32,3 mm	Yes — caliper, same day
Surface and purity	Smooth, clean, free from scoring and cavities without magnification; no visible impurities; ends square	Yes — photograph, same day
Longitudinal reversion	≤2%; oven test at 135 °C for PP-R, 1 h to 4 h by wall thickness, 3 test pieces (ISO 2505 Method B)	Yes — days, in a competent lab
Short-term pressure	PP-R: 16,0 MPa hoop stress at 20 °C for 1 h, 3 test pieces, water-in-water	Yes — the only pressure test that fits
Long-term pressure	PP-R: 4,3 MPa at 95 °C for 22 h; 3,8 MPa at 95 °C for 165 h; 3,5 MPa at 95 °C for 1000 h	No — 1000 h is ~42 days of testing alone

That last row is the trap nobody warns buyers about. The tests that most convincingly demonstrate a material failure are the long-duration hydrostatic tests, and the 1000-hour test at 95 °C takes roughly six weeks of oven time before a report exists. If you wait for that result before notifying your seller, you may well have blown the "reasonable time" requirement in CISG Article 39(1) while doing exactly the diligent thing. Notify first on what you can measure, and say that further testing is in progress — a notice specifying a measured wall-thickness deficiency, with a reservation for pending pressure testing, keeps both the claim and the diligence intact.

Prove Non-Conformity With a Caliper and a Camera, Not an Argument

Clause 10 of ISO 15874-2:2013 is quietly the most useful part of the standard for a buyer in dispute, because it puts the seller's own claims permanently on the product. Marking must be printed or formed directly on the pipe not less than once per metre, must remain legible after storage, handling and installation, must be legible without magnification, and where printing is used its colour must differ from the pipe's own colour.

Table 12 lists what that marking must contain: the number of the standard (ISO 15874), the manufacturer's name or trade mark, the nominal outside diameter and nominal wall thickness written as for example 16 × 2,2, the pipe dimension class, the material — PP-R — and the application class combined with the operating pressure, for example Class 1/10 bar. Where the manufacturer declares the pipe opaque, that is marked too, and opaque pipe must transmit no more than 0,2 % of visible light when tested to ISO 7686.

The traceability requirement is the part worth memorising. Table 12 requires the production period — year and month, in figures or in code — and, where the manufacturer produces at more than one site, a name or code identifying the production site. That single line lets you tie a defective batch to a month and a plant. It is also the reason a supplier who cannot produce a batch certificate matching the marking on the pipe has a much weaker position than he thinks.

So the strongest same-day evidence of non-conformity is usually not the damage at all. It is a photograph of a marking that says PN16 next to an invoice that says PN20, or a marking that omits the standard number entirely, or a run of pipe with no marking for three metres. Pair that with our guidance on what a per-shipment inspection report should show and you can usually tell within an hour whether you are arguing about a batch or about a supplier.

Who Actually Pays: Reading Your Incoterm Before You Blame Anyone

Before the question of fault comes the question of risk, and the Incoterms 2020 rule in your contract answers it. Risk transfer is not about who arranged the freight or who paid for it — a point that costs buyers real money every year, because CIF and CFR sellers pay for carriage to your port while risk left them at the load port.

Under FOB, CFR and CIF, risk of loss or damage passes when the goods are loaded on board the vessel at the port of shipment. Under CIP it passes earlier still, when the goods are handed to the first carrier. Under DAP the seller carries risk to the named destination ready for unloading, and under DDP through arrival, unloading and customs clearance. So for a container of pipe bought CIF that arrives water-damaged, the damage occurred after risk passed to you: your recovery runs against the carrier and your cargo policy, not against the seller's conscience.

Incoterms 2020 rule	Risk passes	Seller's insurance duty	Who pursues transit damage
FOB	On board at load port	None	You
CFR	On board at load port	None	You
CIF	On board at load port	ICC (C) minimum	You, on the seller's policy
CIP	On handover to first carrier	ICC (A) or similar	You, on the seller's policy
DAP	At destination, before unloading	None	Seller
DDP	After arrival and unloading, duty paid	None	Seller

Two warnings follow. First, risk transfer does not touch conformity: if the pipe was already wrong when it went on board, the Incoterm is irrelevant and your claim is a CISG Article 39 notice to the seller.

Second — and this is where CIF buyers lose the most money — the Incoterms 2020 insurance obligation under CIF is only Institute Cargo Clauses (C), the narrowest of the three standard covers, unless you negotiated better. CIP, by contrast, obliges the seller to insure at ICC (A) level. If you buy CIF and want real cover, you must say so in the contract; the rule will not give it to you. Our comparison of FOB versus CIF for pipe imports works through what each term does and does not buy you.

What Your Cargo Insurance Actually Covers

The Institute Cargo Clauses come in three standard forms, CL382, CL383 and CL384 of 1 January 2009, known as (A), (B) and (C). The difference is not a matter of degree. ICC (A) is all-risks cover: physical loss or damage is covered unless an exclusion applies, and you do not have to prove which peril caused it. ICC (B) and (C) are named-perils cover, and their common clause 1.1 requires the loss to be reasonably attributable to one of the listed causes. The burden of proving causation sits on you.

For containerised pipe, the exclusions in the narrower covers line up almost perfectly with the losses that actually happen.

Cause of loss	ICC (A)	ICC (B)	ICC (C)
Fire or explosion	Yes	Yes	Yes
Stranding, grounding, sinking, capsizing	Yes	Yes	Yes
Jettison / general average sacrifice	Yes	Yes	Yes
Seawater entering the container or hold	Yes	Yes	No
Theft or pilferage	Yes	No	No
Washing overboard (deck cargo)	Yes	Yes	No
Earthquake, volcanic eruption, lightning	Yes	Yes	No
Malicious damage	Yes	No (can be bought back)	No (can be bought back)
Any physical loss or damage not listed	Yes	No	No

Read the seawater row against the CIF rule again. A CIF buyer, insured at the contractual minimum of ICC (C), whose container took water through a failed door gasket, has cover for none of it — and water ingress is one of the commonest ways a container of cartoned pipe is spoiled. The same buyer, had he specified ICC (A) in the contract, would not even have needed to prove how the water got in.

Note also that the peril must be reasonably attributable under (B) and (C), which is exactly why the surveyor matters. Under all-risks cover you show damaged goods; under named-perils cover you show damaged goods and a listed cause, and a report written six weeks after the container was returned rarely establishes one.

The Carrier's Liability Cap, Worked Through

Buyers often assume that if the carrier damaged the cargo, the carrier pays for the cargo. Hague-Visby Article IV rule 5(a) says otherwise. Unless the nature and value of the goods were declared by the shipper before shipment and inserted in the bill of lading, the carrier's liability is limited to 666.67 units of account per package or unit, or 2 units of account per kilogramme of gross weight of the goods lost or damaged, whichever is the higher. The unit of account is the IMF Special Drawing Right.

Whether that cap hurts depends entirely on how your pipe was packaged and described, and the arithmetic is worth doing before you instruct anyone. Take an illustrative case — the cargo value here is a worked assumption, not a quoted figure — of 400 cartons of PP-R pipe, 25 kg gross each, so 10,000 kg in total.

• Per package, if the bill of lading enumerates 400 cartons: 400 × 666.67 = 266,668 SDR. At roughly USD 1.36 to the SDR that is on the order of USD 360,000 — far above the value of the cargo, so the cap never bites.
• By weight: 10,000 kg × 2 = 20,000 SDR, roughly USD 27,000. You take the higher of the two, so the enumerated-package figure governs and you are fully covered.
• Per package, if the bill of lading says "1 container said to contain pipe": the container may be treated as the package. 1 × 666.67 = 666.67 SDR, roughly USD 900. The weight calculation then gives 20,000 SDR, and you recover on the order of USD 27,000 — because the higher figure applies — but you have lost the protection the enumeration would have given you.

The lesson is a documentary one and it costs nothing: make sure the bill of lading enumerates the number of cartons or packages inside the container, not merely the container. That single line on a document you review before shipment is worth more, in a serious casualty, than any amount of argument afterwards. The SDR rate itself moves daily, so take the rate on your own claim date from the IMF rather than the approximation used above.

And keep the one-year suit deadline in view throughout. Article III rule 6 discharges the carrier and the ship from all liability whatsoever in respect of the goods unless suit is brought within one year of delivery, or of the date when the goods should have been delivered. Negotiations do not stop that clock; only a formal extension agreed with the carrier, or proceedings, will.

Writing a Notice That Actually Preserves the Claim

CISG Article 39(1) does not merely require you to complain. It requires notice specifying the nature of the lack of conformity. Messages saying "the quality is not good, please advise" have repeatedly been held insufficient, and a buyer who sends one and then waits has often lost the right to rely on the defect at all.

A sufficient notice to the seller contains the contract and invoice reference, the specific non-conformity in measurable terms, the quantity affected, how and when you discovered it, and what you require. Compare the two:

• Insufficient: "The pipes from the last shipment have quality problems. Many are damaged. Please give us a solution."
• Sufficient: "Contract IF-2026-118, invoice 4471, container XXXU1234567, discharged 21 July 2026 and examined 22 July 2026. Of 400 cartons, 96 cartons of DN25 PN20 PP-R measure 3,1 to 3,3 mm wall thickness against the marked and contractual minimum, below the minimum permitted by ISO 15874-2:2013 Table 9, whose tolerance is plus-only. 40 cartons carry no ISO 15874 marking on any length, contrary to clause 10.2 and Table 12. Photographs and caliper records attached; samples retained. Hydrostatic testing to ISO 15874-2:2013 Table 10 is in progress and we reserve our position pending those results. We require replacement of the affected quantity."

Three procedural points make the difference between a notice and a gesture. Send it in writing through a channel that produces a record and, ideally, the channel named in the contract — a message on a chat application to a salesperson who later leaves the company is a weak evidentiary position. Address the entity named on the contract rather than only your usual contact. And keep the reservation clause: the sentence stating that testing is in progress and your position is reserved is what lets you add a material claim later without appearing to have accepted the goods.

One important limit on all of the above: your contract may impose a shorter notice period than the CISG default, and many supply contracts do. Local law in your jurisdiction may also apply its own limitation periods, and some states have excluded parts of the CISG. Treat the deadlines here as the outer framework for a cross-border sale and read your own contract's inspection and notice clause first — where the two conflict, the contract usually wins.

Best-For and Not-For: Which Route Is Worth Pursuing

Not every bad container is worth a claim, and choosing the wrong counterparty wastes the window you have for the right one.

• Pursue the carrier when the goods left conforming and arrived damaged, when the container or seal shows a physical cause, and when the bill of lading enumerates packages so the limitation is generous. Not worth pursuing where the loss is small relative to the per-package cap and the one-year litigation horizon.
• Pursue the insurer when you hold ICC (A) cover, or when you hold (B) or (C) and the cause is clearly a listed peril supported by a survey. Not worth pursuing under ICC (C) for water ingress, theft or unexplained damage — those are precisely the excluded columns.
• Pursue the seller when the non-conformity is dimensional, material or documentary — wall thickness, diameter, marking, missing certificates, wrong pressure class. These are provable, and they do not depend on what happened at sea. Not worth pursuing where the pipe conforms and the damage is plainly transit-related under an Incoterm that moved risk to you.
• Pursue nobody, and change supplier instead, when the defect is systemic rather than incidental: no traceable marking, no batch certificate, a factory that cannot say which line or month produced the pipe. A claim on that container recovers one shipment; the underlying problem returns on the next.

If it is the last of these, the diligence is a separate exercise from the claim — verifying a PP-R manufacturer before the next order and getting container loading and packing specified properly in the contract will prevent more losses than any claims procedure will recover. Certification questions are covered separately in our guide to PP-R pipe certification.

A Worked Timeline You Can Reuse

Assume a container discharged on Monday 20 July 2026, taken to your warehouse the same day, opened on Tuesday. The schedule below keeps every option open, and the sequence matters more than the speed: each action is placed against the clock it protects, because work done for one counterparty does not preserve your position against another. Notifying the carrier does not satisfy CISG Article 39, and notifying the seller does nothing about the three-day concealed-damage window.

When	Action	Which clock it protects
Mon 20 July, at removal	Write the exception on the delivery receipt; photograph seal, doors, load in place	Carrier — Art. III r.6 apparent damage
Tue 21 July	Open and examine; caliper the wall and diameter; photograph marking; appoint surveyor	Seller — CISG Art. 38 examination
By Thu 23 July	Written notice to carrier for any damage not apparent at removal	Carrier — the 3-day concealed window
Same week	Notify the insurer; notify the seller specifying measured non-conformities, reserving position on pending tests	Insurer policy notice; CISG Art. 39(1)
Weeks 2–6	Survey report; short-term hydrostatic and reversion testing; quantify the loss	Evidence for all three
By 20 July 2027	Suit against the carrier, or a written time extension agreed with the carrier	Carrier — the one-year time bar
By 20 July 2028	Absolute outer limit for notice to the seller of any latent non-conformity	Seller — CISG Art. 39(2) two-year cut-off

Note what that schedule does with the 1000-hour pressure test: it never waits for it. The notice goes out in week one on measurable, same-day evidence, with the long test flagged as pending. That is the only sequence that satisfies both the diligence a serious claim needs and the promptness Article 39 demands.

Two dates on that table are worth putting in a calendar the day the container lands, because they are the ones that pass silently. The one-year carrier bar in July 2027 will arrive in the middle of a negotiation that feels like it is progressing; correspondence does not extend it, and a carrier with no incentive to remind you will not.

The two-year CISG cut-off in July 2028 matters for a different reason: a latent material fault in PP-R may not show as a failed joint or a split pipe until the system has been in service through a heating season or two, and Article 39(2) runs from handover rather than from the day the pipe failed. A defect that surfaces in year three is, as against the seller, already out of time.

What to Put in the Next Contract

Every expensive lesson above is cheaper to buy at contract stage than to litigate. Four clauses do most of the work, and none of them costs a supplier anything to accept if the supplier is sound.

• Specify ICC (A) cover explicitly if buying CIF, or buy CIP instead, where ICC (A) is the default obligation. Naming the clause set converts an argument into a policy term.
• Require the bill of lading to enumerate cartons, not just the container, so the per-package limitation works in your favour rather than the carrier's.
• Require ISO 15874 marking including the traceability elements — production period as year and month, and the production-site code where the manufacturer runs more than one site — plus a batch certificate matching that marking for every shipment.
• Fix the replacement lead time in writing, not the original lead time. A supply contract almost always states a production lead time for the order and says nothing about how fast a rejected quantity is remade and reshipped — which is the number that decides whether your site stops. Ask for it as a stated commitment, since it varies by factory, by size mix and by season, and a supplier who will not put a replacement window in writing is telling you something.
• Agree the notice mechanics up front: a named contract address for notices, an inspection period long enough to be realistic for a container, and an express right to reserve position pending laboratory testing.

Sizing and pressure-class questions that feed those clauses are covered in our reference on PP-R pipe sizes, and if you are importing into West Africa the documentary requirements differ enough to be worth reading on their own in our guide to importing PP-R into Nigeria.

Conclusion

A defective pipe shipment claim is won or lost in the first week, and mostly in the first hour. The exception written on the delivery receipt, the photograph of the intact seal, the caliper reading against a plus-only tolerance and the notice that specifies a clause number rather than a grievance — these cost almost nothing and they are what every later stage rests on.

Keep the three clocks separate in your head. Three days for concealed damage and one year to sue the carrier. A reasonable time, and never more than two years from handover, against the seller. And your policy's own notice period, on cover that may be far narrower than the letters CIF led you to expect. Work the clocks in that order, and the question of who ultimately pays remains open long enough for the evidence to answer it.

Frequently Asked Questions