© 2026 Observater Surveys and Services Group. All rights reserved.
Observater Surveys and Services Group · Luanda · Lobito · Namibe · Soyo
Bunkers are the largest variable cost on a charter, and at Angolan ports every tonne of them can be argued: at delivery, at on-hire and off-hire, at redelivery, and in the consumption figures in between. One party’s numbers become the record unless independent figures exist. Our bunker surveyors attend at Luanda, Lobito, Namibe, and Soyo through the group’s active operations in Angola: every tank sounded, temperatures and densities taken, calibration tables applied, and the arithmetic shown. If the stem is tomorrow or the dispute is already running, the second best time to instruct is now.
Get a Bunker Surveyor Moving Email the InstructionA few percent short on a full stem is real money, gone quietly. Short delivery hides in temperature, in foam, in a gauge read generously. Without an independent survey at delivery, the bunker delivery note becomes the truth, and the invoice follows the note.
On/off-hire in Lobito, and both sides are certain. Owner and charterer each hold a figure they believe, and hidden tanks, helped temperatures, and misread tables all favor whoever wrote the record. The party without an independent sounding record argues from memory against paper.
Consumption disputes grow in the dark. A vessel that burns more than the charter party says eats the margin voyage after voyage, and log abstracts alone will not settle whether the cause is the ship, the fuel, or the figures.
The supplier surveyed. Did you? If the other side attended the transfer and you did not, the only measured record is theirs, taken by a party paid to protect the sale. Your surveyor puts a second file on the table and tests theirs against the tanks.
Bunkers are most often the single largest drain on a ship’s operating cost, with the power to erase a voyage’s profit for owners and charterers alike. Determining the accurate quantity of bunkers on board at delivery, at redelivery, and at any point in between is what keeps that cost from turning into a dispute, and what wins the dispute when it comes anyway.
The determination is only worth the independence and the discipline behind it, and every step taken in determining the quantity of bunkers on board is taken with care and attention, because a careless reading costs someone real money. Our surveyors work to one standard on every attendance in Angola: check the vessel’s plans first, sound every tank on the plan, apply measured temperatures and densities, work the calibration tables, and show the arithmetic, so the certified figure can be tested by anyone who needs to test it.
The delivery is where the money moves and where it goes missing. Our BQS attendance covers both sides of the transfer at Angolan ports: the barge or shore tanks gauged before and after, the receiving vessel sounded before and after, meters read where fitted, temperatures taken on both sides, and the two records reconciled on the spot, so a difference is raised while the barge is still alongside instead of in a letter two weeks later.
Experience is applied to uncover the trade tricks that shave a stem: aeration that inflates a sounding, temperatures declared warmer than measured, gauge readings taken at a helpful trim, and tapes that read what the reader wants. Each is checked, and what is found is recorded.
A charter begins and ends with the same two questions: how much fuel is on board, and what condition is the ship in. Our on-hire and off-hire attendances at Luanda and Lobito settle both at once: all bunker tanks sounded and quantities certified, and the vessel’s condition recorded compartment by compartment, holds, hatch covers and coamings, decks, and cargo-relevant fittings, with vessel condition, machinery, and certificates inspected and certificates verified current and in use.
These surveys are often performed jointly: one surveyor appointed by owners, another by charterers, attending together as second or even third parties. We act for either side, or jointly with the other party’s surveyor, under one rule: one interest per matter.
Waiting for redelivery to discover a bunker problem is choosing to discover it at the most expensive possible moment. Intermediate bunker surveys put a measured checkpoint in the middle of the charter: tanks sounded, ROB certified, and consumption to date reconciled against log abstracts and delivery notes, so a drift between the ship’s figures and the measured figures is caught while it is still small and correctable.
At redelivery, ROB is certified tank by tank with the same discipline as on-hire, so the final bunker statement reconciles against the first and the difference is consumption, not confusion. ROB surveys also stand alone: before repairs, before a sale or handover, and whenever fuel on board must be a measured fact rather than a declared one. The same surveyors carry out ship pre-purchase surveys and damage inspections at Angolan ports.
When the delivered figure and the invoiced figure disagree, somebody is paying for fuel that is not in the tanks. Shortage investigation follows the arithmetic to where the missing tonnes went: the barge figures, the vessel figures, the temperatures used on each side, the tables applied, and the paper trail between them, until the difference has a cause and the cause has an address. The investigation works whether we attended the original transfer or not.
Consumption investigations put the whole record on one table: log abstracts, noon reports, bunker delivery notes, sounding records, and performance data, reviewed line by line against a physical survey of the tanks, so an overconsumption claim, a performance claim, or a quiet suspicion is settled on reconciled figures rather than rival estimates.
Quantity is half the bunker argument; quality is the half that can damage an engine. Sampling is witnessed at the manifold, splits are sealed and labeled, custody records are kept, and sealed samples are routed to accredited laboratories under chain of custody, with MARPOL sample handling witnessed and recorded. When a quality dispute surfaces weeks later, the sealed retained sample and its unbroken custody record are what make the laboratory result usable. Barge tank inspections and bunker escort attendances complete the service.
The vessel’s general and tank arrangement plans are checked first, and every tank on the plan is sounded: bunker tanks, sludge and lube tanks, bilges, cofferdams, and deep tanks in investigative work. Gauges are checked against alteration, gauged tanks are sounded anyway, and our own calibrated instruments and kink-free tapes are used and verified.
Measured temperatures and densities are applied, the vessel’s calibration tables are worked, trim and list corrections made, and the calculation sheets are annexed to the certificate, so the figure can be tested by anyone who needs to test it, including the party who dislikes it.
On-hire and redelivery protection, consumption audits when noon reports drift, ROB before yard periods and sales, and condition records that close charter arguments before they open.
Independent delivery figures on every Angolan stem, intermediate checkpoints mid-charter, and off-hire files that settle the bunker account on measurements rather than negotiation.
A delivery defended is a customer kept: independent attendance that protects a legitimate stem against a challenge, and sampling custody that protects the quality side of the sale.
Bunker and condition attendance for members and assureds calling Angolan ports, casualty-linked ROB, and consumption investigations reported to the standard adjusters apply.
Pre-purchase bunker verification and ROB certification, so the fuel in the deal is a measured asset, not a represented one.
Late-stage document review and reconciliation in bunker disputes: the file examined, the figures re-run, and the findings stated in a form proceedings can use.
Where we attend
Our highly trained bunker surveyors carry out all types of bunker surveys in Angola: BQS at Luanda berths and anchorage, on-hire and off-hire bunker and condition surveys at Lobito, ROB and redelivery surveys wherever the vessel lies, intermediate surveys mid-charter, shortage investigations, consumption audits, and sampling attendances on every stem that needs them. At Namibe, Soyo, and other Angolan ports and terminals, instructions are taken and attendance is confirmed before work begins, usually within hours.
WhatsApp a Bunker Surveyor ops@observater.comA bunker survey is an independent measurement of the fuel on board a ship: every bunker tank is sounded, temperatures and densities are taken, the vessel’s calibration tables are applied, and the quantity is certified in writing, so owners, charterers, and suppliers settle on a measured figure instead of a declared one.
Yes, and usually many times their cost. Hidden tanks, helped temperatures, and calculation errors are recurring realities of the bunker trade, and each one moves real money in one direction. An independent surveyor who physically sounds every tank turns those tricks into recorded findings instead of paid invoices.
ROB means remaining on board: the measured quantity of fuel in a vessel’s tanks at a given moment. ROB surveys certify that figure at redelivery, before repairs, before a sale, and whenever fuel on board must be a measured fact rather than a declared one.
The instruction line runs 24/7 and stems rarely give notice, so our bunker surveyors work at short notice as standard: who attends, when, and on what basis is confirmed in writing before work begins, usually within hours of instruction.
Yes. Joint on-hire and off-hire attendances are common: one surveyor for owners, one for charterers, sounding together. We act for either side under one rule: one interest per matter; if the other side of the same matter calls afterward, they are referred to a different firm.
A bunker quantity survey measures the fuel actually transferred during bunkering: the barge or shore tanks are gauged before and after, the receiving vessel is sounded before and after, and the two records are reconciled, so a short delivery is caught while the barge is still alongside.
An on-hire bunker survey fixes the fuel quantity and vessel condition at the start of a charter; an off-hire survey does the same at its end. Together they make the bunker account and condition claims settle on measurements taken at both ends rather than on argument.
An intermediate bunker survey is a measured checkpoint taken mid-charter: tanks sounded, ROB certified, and consumption to date reconciled against log abstracts and delivery notes, so a drift between the ship’s figures and the measured figures is caught while it is still small and correctable.
Shipowners and managers at on-hire, redelivery, and yard periods; charterers and operators on every stem and off-hire; bunker suppliers and traders defending deliveries; P&I clubs and insurers on member matters; buyers before a purchase; and lawyers in bunker disputes. One firm serves each, one interest per matter.
Most bunker surveys are completed within a few hours on board, depending on the number of tanks and the operation attended, with figures available on completion and the certificate and calculation sheets following promptly. Attendance at Angolan ports is confirmed before work begins, usually within hours of instruction.
Soundings, transfers, holds, hatch covers, and samples: the work as it actually looks, from files our bunker surveyors have attended.
The next stem will not wait
Every unattended stem, handover, and redelivery settles on the other party’s figures. Tell us the vessel, the port, and the timing, and our bunker surveyors confirm who attends, when, and on what basis, in writing, before anything starts.
Get a Bunker Surveyor Moving Email the InstructionObservater Surveys and Services Group · Surveyors stationed in Angola: Luanda, Lobito, Namibe, and Soyo · ops@observater.com · All attendances are performed under our standard terms of business, available on request.
When precision matters, Observater Surveys Group is your Partner of Choice
© 2026 Observater Surveys and Services Group. All rights reserved.