Anyone who has stored petroleum product at a third-party terminal has signed, or at least reviewed, a Tank Storage Agreement — but the document itself rarely gets much attention outside the legal and operations teams who draft it. For traders, importers, and finance teams evaluating a storage arrangement for the first time, it helps to know what is actually inside one, since the clauses determine not just the price, but who bears the risk if something goes wrong.
What a TSA Is For
A Tank Storage Agreement (TSA) is the commercial contract between a terminal operator and a client that governs the terms under which petroleum product is held in the terminal's tankage. It is fundamentally a custody arrangement — the client retains ownership of the product itself, while the terminal takes physical custody and responsibility for its safekeeping, subject to the terms of the agreement. Signing a TSA does not transfer any ownership interest in the tank or terminal infrastructure; it grants a contractual right to use a defined amount of storage capacity for a defined period.
The Clauses That Actually Matter
Parties and defined terms. Like any commercial contract, a TSA opens by identifying the terminal operator and the client, and defining key terms used throughout — "Product," "Tank," "Nomination," "Throughput," and so on — precisely enough to avoid disputes over interpretation later.
Tank nomination and specification. This section identifies which tank, or category of tank, the agreement covers, its working capacity, and any product-specific requirements (for example, whether the tank is heated for viscous products, or dedicated to a single grade versus available for blending).
Term and renewal. The initial contract period, and the mechanism for renewal or termination — whether it renews automatically unless either party gives notice, or requires active renegotiation at expiry.
Fee structure. Typically split between a storage fee (charged per unit volume per period, regardless of movement) and a throughput fee (charged per unit volume moved in or out). Some agreements bundle these into a single rate; others separate them explicitly, often with a minimum throughput commitment attached — if the client doesn't move enough volume to justify the reserved capacity, a shortfall fee applies.
Product specification and quality liability. Defines what specification of product the tank will hold, and — critically — who is responsible if the product degrades or becomes off-specification while in storage. This is one of the more heavily negotiated sections, since it determines whether contamination risk sits with the client or the terminal.
Stock levels and loss allowance. Sets minimum and maximum permitted stock levels, and specifies a loss allowance — a small percentage tolerance for evaporation, handling loss, and measurement variance that is treated as normal rather than a shortfall requiring compensation.
Liability and insurance. Caps the terminal's liability in the event of loss or damage, and specifies what insurance the terminal carries versus what the client may need to arrange separately for named-cargo cover.
Force majeure. Standard provisions excusing performance in the event of circumstances beyond either party's control — though the specific list of qualifying events, and the notice period required, varies by agreement.
Termination and handback. Sets out how the agreement can be terminated early, and the condition in which the tank must be returned — including any cleaning obligations and the process for a joint closing inspection and gauge.
How a Tank Storage Receipt Fits In
A Tank Storage Receipt (TSR) is a separate document issued under the TSA, confirming the specific volume and grade of product currently held on a client's account at a point in time. Where the TSA is the governing contract, the TSR is closer to a snapshot of the client's current position under that contract — and it is the TSR, not the TSA itself, that banks typically want to see when a client wants to use stored product as collateral for trade finance. A lender extending credit against a TSR will still usually want sight of the underlying TSA, though, since it is the TSA that determines what obligations and risks attach to the stored product in the first place.
What's Usually Negotiable
In practice, the clauses most often negotiated between terminal and client are the fee structure (particularly whether there's a throughput minimum, and how steep the shortfall penalty is), the allocation of quality/contamination liability, and the length of the initial term. Clients storing product for a strategic reserve or long-term inventory position tend to push for longer terms and lower per-period rates; clients using storage tactically around market timing tend to prioritise flexibility and shorter notice periods over the lowest headline rate.
Where This Fits Into Our Storage Service
Every storage arrangement we offer at Rotterdam, Houston, Jurong, and Fujairah is documented through a Tank Storage Agreement covering the terms above, with a Tank Storage Receipt issued once product is received into the tank. Buyers evaluating storage for the first time are welcome to review a draft TSA before committing to a nomination — understanding the fee structure and liability allocation up front avoids surprises once product is already in the tank.
Frequently Asked Questions
Does a Tank Storage Agreement mean I own part of the tank?
No. A TSA grants a contractual right to store a specified volume of product in a specified tank (or shared tankage) for the term of the agreement — it does not transfer any ownership interest in the physical tank or terminal. Ownership of the tank remains with the terminal operator throughout.
What happens if I don't hit the minimum throughput specified in the agreement?
Most TSAs with a throughput fee structure include a minimum throughput commitment — if actual volume moved in or out of the tank falls short of that commitment during the period, the client is typically billed a shortfall fee calculated on the difference, since the terminal has reserved capacity and handling resources regardless of actual usage.
Can a Tank Storage Agreement be assigned to another party, like a tank lease?
It depends on the specific agreement, but TSAs are generally less freely assignable than dedicated tank leases, since storage arrangements are often within shared or semi-shared tankage rather than a specific tank reserved solely for one client. Assignment or novation typically requires the terminal operator's consent and fresh KYC on the incoming party.
What is a typical loss allowance in a storage agreement?
Loss allowances — accounting for evaporation, handling loss, and measurement tolerance — are usually expressed as a small percentage of throughput volume, commonly in the range of 0.1% to 0.3% depending on product volatility (light products like gasoline typically carry a higher allowance than heavier products like fuel oil). Losses beyond the agreed allowance are usually for the account of whichever party the agreement specifies, often the storage provider if within their custody period.
Related Reading
Our tank storage service overview — terminals, capacity, and contract types.
Dedicated, fixed-term tank capacity leases as an alternative to standard storage.
How intake, gauging, and jetty scheduling work at our terminals.
Discuss storage terms and request a draft Tank Storage Agreement.
