MOB and DEMOB: Where Offshore Project Freight Leaks Money
Every offshore campaign is quoted with two freight events in it. Mobilisation gets the spread to the job. Demobilisation gets it home again. On the tender they sit next to each other, often at similar-looking numbers, and they get approved together.
They are not similar events. Mobilisation is planned for months by people who are paid to plan it. Demobilisation is planned in the last week of a job by people who are tired, over budget, and already assigned to the next campaign. That asymmetry is where the money goes.
This guide is about the second half. What actually drives MOB and DEMOB cost, why the return leg behaves differently from the outbound one, and the customs clock that turns a late demob from an inconvenience into a tax event.
There are no rates in this article. Charter and heavy-lift pricing moves with vessel availability, lane, season and lift requirement, and a number printed here would be wrong before you finished reading it. What is here instead is the list of things that move the number, which is the part you can actually control.
What MOB and DEMOB actually cover
In offshore contracting, mobilisation is everything required to get equipment, tooling and consumables from wherever they are to the point where work can begin. Demobilisation is the reverse: getting it all back to a base, a store, an owner, or onward to the next job.
Both are usually contract line items, separate from the day rate. That separation is deliberate and it is where the commercial risk sits, because the day rate is closely scrutinised and the MOB/DEMOB line frequently is not.
What sits inside those lines, in practice:
Transport of the spread itself, in whatever configuration it needs
Packing, crating, sea-fastening and lifting arrangements
Customs entry at destination, and customs exit again
Port, terminal and handling charges at both ends
Storage where the equipment lands before or after the working window
Any inspection, certification or cleaning required before the equipment moves
The last three are the ones that quietly grow. Nobody plans to store a spread. Storage happens because something else slipped.
Why DEMOB is not MOB in reverse
If freight were symmetric, you would price one leg and double it. It is not, for four reasons that show up on almost every campaign.
The schedule is known on the way out and unknown on the way back. Mobilisation has a date it must hit, and that date has been in the plan for months. It can be booked early, into a chosen sailing, at a rate agreed in advance. Demobilisation happens when the work finishes, and work finishes when weather, scope and the client say so. Booking capacity against a date that keeps moving is a different commercial position, and it is a weaker one.
The cargo has changed. Equipment that went out clean comes back used. It may carry residues, sediment, or hydrocarbon traces. It may have been opened, modified, or repaired offshore. Some of it may be damaged. The packing that protected it outbound may have been cut away to deploy it. Restoring the shipment to a condition that can legally and safely travel is work that was never in the outbound estimate.
Quantities do not match. Consumables are consumed. Spares are fitted. Items are transferred to the client or to another vessel. What arrives back is rarely what left, and the customs paperwork has to explain the difference rather than pretend it away.
Nobody owns it. The mobilisation had a coordinator with a mandate. By demob, that person is often on another project. This is the single most common root cause we see, and it is also the cheapest one to fix — it costs a name and a handover email.
The customs clock that ties the two legs together
For a foreign contractor bringing owned equipment in for a job, the sensible route is Singapore's temporary import scheme rather than an ordinary import. We cover the mechanics in full in our guide to shipping an ROV through Singapore, but the part that matters for project planning is the timing.
Goods may be temporarily imported into Singapore for a maximum of 6 months. Extensions are possible, and a maximum of 3 months may be applied for each extension request, submitted as an amendment through TradeNet with supporting documentation including a cover letter explaining the reason.
Now put that against a real campaign shape. Equipment clears early so it is not the thing holding up a sailing. It waits for a vessel window. The scope runs long, or weather takes a fortnight. The job ends and the spread sits in a yard while someone works out where it goes next.
Every one of those is a legitimate operational event. Together they can consume the regulated period without anyone making a decision to do so.
This is why MOB and DEMOB have to be planned as one instrument rather than two events. The permit that lets equipment in — a Customs In-Non Payment (Temporary Consignment) permit — is closed by a Customs Out (Temporary Consignment) permit on the way out. Until that second permit is filed and matched, the record says the equipment is still in the country.
A practical rule: the demob date is a customs date before it is a logistics date. Put the temporary import expiry in the project schedule next to the weather window and the vessel window, because it constrains the job in exactly the same way.
The cost drivers you can actually move
Freight cost on a project is not one lever. It is a stack, and the items near the top are the ones most within your control.
1. Whether the spread must arrive together. A spread that is useless in parts behaves differently from a set of independent boxes. If the control cabin without the vehicle is worth nothing, then a split shipment is not a partial delivery — it is a zero delivery with storage charges attached. That single question decides more about the shipping method than weight does.
2. How many axes are oversized. Our out-of-gauge cargo guide sets out the equipment logic: a flat rack takes over-width and over-length loads because its open sides and collapsible ends accept overhang; an open top suits over-height loads that still fit length and width and load from above by crane. Cargo oversized in more than one axis moves you toward flat rack or break bulk. Each step along that ladder narrows the pool of vessels and services that can take you.
3. Whether anything is controlled. If any item sits on Singapore's Strategic Goods Control List, permits may be required for export, transhipment or transit — and Singapore is a transhipment hub, so cargo that never intended to stop there is still engaged in a regulated activity. Our guide to the strategic goods permit covers the check. Control status is driven by classification, which makes the HS code an input to project cost, not a clerical afterthought.
4. Whether anything is dangerous goods. Batteries, gas cylinders, paints, solvents and certain chemicals travel under the IMDG Code by sea. Our dangerous goods guide covers the classes and the declaration. A single unlisted aerosol in a workshop container can stop the whole movement.
5. How many handovers there are. Every transfer between parties is a place where a document can fail to follow the cargo. Fewer movements and fewer counterparties is usually cheaper than the same route with more, even when the headline rate looks worse.
6. Storage, at both ends. Free periods at terminals are finite. Storage is the charge that accrues while everyone is waiting for a decision, and it is almost never in the original estimate. Our breakdown of hidden shipping costs covers the line items that behave this way.
Where charter changes the arithmetic
Chartering is normally framed as the expensive option, and for a single unit on a served lane it usually is. The framing changes when the shipment is a whole mobilisation.
A full spread moving as one controlled movement removes the class of failure where half of it arrives. It also collapses the number of regulated events, the number of handovers, and the number of documents that have to follow separate boxes to separate places. Those are the drivers listed above, all reduced at once.
IFG has run this shape of move: eight ROV units transported from Vungtau, Vietnam to Gelang Patah, Malaysia by charter vessel — a full ROV fleet as a single controlled movement across a regional lane.
We are not going to tell you charter is always right. We are saying the comparison is not rate-per-tonne against rate-per-tonne. It is total delivered outcome against total delivered outcome, and on a spread that must arrive complete and on a date, those two comparisons give different answers.
What a defensible MOB/DEMOB tender line looks like
Most disputes about project freight are not really about money. They are about scope that was never written down, discovered at the moment somebody has to pay for it. A tender line that survives contact with a real campaign says four things explicitly.
What is included, item by item. Not "mobilisation of equipment" but the list: transport, packing and sea-fastening, customs entry, terminal and handling charges, storage allowance, and the return leg with the same breakdown. If storage is included, say how many days. If it is not, say so plainly, because storage is the charge most likely to appear.
Which party holds the customs position. Somebody is the importer of record. Somebody files the permits. Somebody is legally responsible for the accuracy of the declaration. In Singapore only a licensed declaring agent lodges the declaration, but that does not move the responsibility for what it says. Naming this in the contract costs a sentence and prevents the argument entirely.
What happens when the schedule moves. Offshore schedules move. A tender line that assumes they do not is a tender line that will be renegotiated under pressure. State the assumed campaign window, and state what changes if the return date slips beyond it — including who pays for a customs extension and any storage that follows.
What condition the equipment returns in. Cleaning, decontamination, repacking and re-certification are real work with real cost. Deciding at tender whose scope they sit in is far cheaper than deciding it on a quay with a vessel waiting.
None of this is exotic. It is the difference between a freight line that was priced and one that was guessed, and it is visible in the first week of the campaign rather than the last.
A MOB/DEMOB plan that does not leak
The sequence below is the one worth arguing for at tender stage, when changing it is still free.
Price DEMOB at tender, not at demob. An unpriced return leg is not a saving. It is a cost that has been moved to a moment when you have no leverage.
Name the demob owner in the mobilisation plan. One person, in writing, before the spread ships.
Classify everything once, at the start. HS codes, control status, dangerous goods status. These drive both legs and they do not change on the way home.
Put the temporary import expiry in the project schedule. Next to the vessel and weather windows, not in a customs folder nobody opens.
Set the extension decision date deliberately. Extensions are amendments through TradeNet with a documented reason — that needs lead time and a paper trail. Decide before you are inside the last fortnight.
Record what leaves and in what condition. Photographs, seals, counts. The demob declaration has to explain any difference between what went out and what comes back.
Plan the cleaning and re-packing. Used equipment is not shippable equipment. Budget the work that makes it travel-ready.
Decide the destination before the job ends. Equipment with no agreed destination goes into storage by default, and storage is the charge nobody approved.
File the Customs Out (Temporary Consignment) permit and close the loop.
Debrief the freight, not just the operation. The difference between the MOB estimate and the DEMOB actual is the most useful number your next tender has.
Steps 1, 2 and 8 are the three that get skipped. They are also the three that cost nothing to do.
Where IFG fits
IFG Shipping lists MOB and DEMOB services for oil and gas and offshore projects among its sea freight and heavy lift services, alongside vessel chartering for oversized shipments, heavy lift transport for project cargo, and customs documentation and compliance. Our named industry sectors include Oil & Gas (ROV Transport), and we handle underwater survey equipment as routine work.
Mobilisation and demobilisation are the planned movements. The unplanned one is the part that fails mid-campaign, and it follows completely different rules — we cover that separately in moving critical spares when the asset is down.
If you are pricing a campaign and want the return leg costed properly while it is still a tender line rather than a surprise, that is a conversation worth having early.
See IFG's freight logistics services, or email contact@ifgshipping.com with the spread list and the campaign window.
Frequently asked questions
What is the difference between MOB and DEMOB?
Mobilisation is the movement and preparation required to get equipment, tooling and consumables to the point where offshore work can begin. Demobilisation is the return movement once the work is done. Both are normally separate contract line items from the day rate.
Why does DEMOB often cost more than MOB?
Four reasons: the return date is uncertain while the outbound date is fixed, so capacity is booked from a weaker position; the equipment has been used and may need cleaning, repacking or repair before it can travel; quantities no longer match what left, so the paperwork has to account for the difference; and ownership of the task has usually passed to someone who was not part of the original plan.
Does the customs clock affect demobilisation?
Yes, directly. Goods temporarily imported into Singapore may stay a maximum of 6 months, with a maximum of 3 months applied for per extension request through a TradeNet amendment supported by a cover letter. A slipped campaign can consume that period, so the temporary import expiry belongs in the project schedule.
Do we need a strategic goods permit for equipment just passing through Singapore?
Possibly. Singapore Customs states that controlled items may require permits for export, transhipment or transit. Cargo that transships without ever working in Singapore is still engaged in a regulated activity if the goods are on the control list.
Should a whole spread move on one charter?
It depends on whether the spread is useless in parts, how many items are oversized in more than one axis, and whether there is a fixed window at the receiving end. A single controlled movement reduces the number of handovers, documents and regulated events at the same time. IFG has moved eight ROV units from Vungtau, Vietnam to Gelang Patah, Malaysia by charter vessel.
Why does this article not give MOB and DEMOB rates?
Because any figure would be misleading. Charter and heavy-lift pricing moves with vessel availability, lane, season and lift requirement. The useful thing to publish is the list of drivers that move the number, which is what this article does.
Sources
Singapore Customs — Temporary Import Duration and Extension: customs.gov.sg
Singapore Customs — Temporary Import of Scientific or Technical Goods: customs.gov.sg
Singapore Customs — Qualifying Goods and Purposes for Temporary Import: customs.gov.sg
Singapore Customs — List of Military Goods and Dual-Use Goods, Strategic Goods Control List: customs.gov.sg
IFG Shipping — Services and About: ifgshipping.com
Image note: the header image is a generated illustrative scene, not a photograph of an IFG Shipping operation.
Note: customs schemes and permit requirements change, and contract structures vary by operator. Requirements here were verified against the sources above on 7 September 2026. Confirm with Singapore Customs or your declaring agent before you ship. This article is educational and is not legal or contractual advice.
Iman Yusoff is Founder and Director of IFG Shipping, with more than 20 years in freight and cross-border trade across the Singapore, Malaysia and Indonesia corridor.
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