What Questions Should I Ask an LPG Cylinder Supplier Before Signing a Long-Term Contract?
Introduction
The first contract I ever reviewed for a long-term cylinder supply deal taught me something that’s stuck with me since: the questions you ask before signing matter more than almost anything you negotiate into the contract itself. A well-written contract can’t protect you from a supplier who never had the capacity to fulfill it, and no clause fixes a relationship where the basic facts were never actually verified going in.
A long-term contract is a different commitment than a trial order. You’re not just buying one shipment — you’re tying your distribution business to this supplier’s capacity, consistency, and honesty for months or years. The questions below are the ones I make sure get answered, with documentation, before any signature goes on a long-term agreement.
Core Questions to Ask (Before You Sign)
What Certifications Do Your Cylinders Meet?
Don’t accept “international standards” as an answer — ask for the specific standard by name (ISO 4706, DOT, EN 1442, NOM) and request the certificate itself, along with the issuing body’s contact information so you can confirm it independently.
If you want to understand exactly what a genuine certification should specify in terms of material grade, wall thickness, and weld testing, our breakdown of the ISO 4706:2023 standard is a useful reference before this conversation.
What Is Your Production Capacity Per Month?
This question isn’t really about the number — it’s about whether that number can survive your actual order volume plus everyone else’s. Ask specifically what percentage of stated capacity is already committed to existing long-term contracts, and what happens to your order if a larger client’s order conflicts with the schedule during peak season.
What Are Your Warranty and Defect Policies?
Get this in writing, not in conversation. Ask exactly what’s covered (valve failure, coating defects, weld failure), for how long, and what the claims process actually looks like — does the supplier require the defective unit shipped back at your cost, or do they accept photo/inspection evidence?
A supplier who can’t answer this clearly hasn’t thought it through, which tells you something about how they’ll handle a real claim.
Can You Provide Third-Party Inspection Reports?
This is non-negotiable for a long-term commitment. Ask whether inspection happens in-house only or through an independent body, and request a sample report from a recent batch before you sign anything. A reputable manufacturer should be able to produce this without resistance or delay.
What Are Your Delivery Timelines?
Get specific numbers: average production lead time, typical port-to-port transit time to your destination, and — critically — what their actual on-time delivery rate has been over the past 12 months, not just their quoted target. Ask what contingency plan exists if a shipment is delayed past the contracted window.
Contract Risk Section
These are the two traps I see catch distributors most often — both are things a quote can hide and a signed contract can lock you into.
MOQ Traps
Minimum order quantity sounds like a simple number, but it’s where a lot of long-term contracts quietly go wrong. Be specific about what counts toward the minimum:
Trading companies often advertise lower MOQs than factories because they’re aggregating demand across multiple buyers, and that convenience typically comes at a price premium of roughly 10–25% above factory-direct pricing¹ — worth confirming you’re actually negotiating with a working factory and not a reseller layering margin on top.
Ask whether the MOQ applies per SKU or across your total order — a request split across multiple cylinder sizes or valve types can quietly multiply your real minimum commitment several times over if each variation triggers its own setup minimum.
As a reference point, our own factory’s minimum order is one 40HQ container per shipment — confirm whatever number you’re quoted applies to a single SKU or spans your full mixed order, because that distinction changes your real commitment significantly.
Hidden Logistics Costs
The unit price on a quote sheet is rarely the full story. Confirm your Incoterm in writing and understand exactly where supplier responsibility ends — FOB places risk on the buyer the moment goods clear the rail at the origin port, while CIF and DDP shift more of that risk and cost onto the seller, but usually at a higher quoted unit price².
Buyers comparing quotes across suppliers sometimes unknowingly compare an FOB number against a DDP number, which makes the FOB quote look artificially cheaper.
Beyond the Incoterm itself, ask directly about: packaging costs (is export-grade packaging included or billed separately), inspection fees if you require third-party verification, and demurrage or storage charges if your shipment sits at port awaiting documentation. A supplier who answers these specifically, with numbers, is a different category of partner than one who waves the question off with “we’ll sort it out later.”
Top 10 Questions Buyers Ask Suppliers
Quick answer: Before signing a long-term LPG cylinder supply contract, buyers should ask:
(1) What certifications do your cylinders meet, and can I verify them independently?
(2) What is your monthly production capacity, and how much is already committed elsewhere?
(3) What are your warranty terms and defect claims process?
(4) Can you provide third-party inspection reports?
(5) What is your actual on-time delivery rate?
(6) Does your MOQ apply per SKU or across a mixed order?
(7) What Incoterm are we quoting under, and what does it exclude?
(8) Are packaging and inspection fees included in the unit price?
(9) What is your payment term structure, and is it negotiable?
(10) What happens contractually if a shipment is delayed or fails inspection?
FAQ Schema
Q: What questions should I ask before signing an LPG cylinder supply contract?
A: Ask about certifications and how to verify them, monthly production capacity and existing commitments, warranty and defect claims process, availability of third-party inspection reports, actual on-time delivery rate, MOQ structure, Incoterms, and what happens if a shipment is delayed or fails inspection.
Q: What is a typical MOQ for LPG cylinders from a Chinese manufacturer?
A: This varies by factory, but many manufacturers set MOQ at the container level — for example, one 40HQ container per shipment — rather than a fixed unit count, so always confirm whether the minimum applies per SKU or across your full order.
Q: What's the difference between FOB and DDP pricing for LPG cylinders?
A: FOB means the buyer takes on responsibility and cost once goods are loaded onto the vessel at the origin port; DDP means the seller handles the full shipment through customs clearance and delivery, usually reflected in a higher quoted unit price.
Conclusion
A long-term contract is only as strong as the due diligence behind it. The ten questions above aren’t about being adversarial with a new supplier — they’re about making sure both sides are working from the same understanding before either one is locked in. A supplier with nothing to hide will answer every one of these specifically and in writing. That’s exactly what you should require before you sign.
Download our free supplier interview template — the exact questions, in order, to use on your next supplier call.
Footnotes
- Trading companies often price 10-25% above factory-direct rates.
- FOB shifts risk to buyer earlier than CIF or DDP terms.