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Observater Surveys and Services Group · Bissau · Guinea-Bissau
Bunker quantity surveys at the stem, on-hire and off-hire ROB, intermediate soundings, shortage investigations, and MARPOL sampling: our bunker surveyors in Bissau attend on instruction, with the attendance confirmed in writing first.
Shipowners, charterers, bunker buyers and traders, P&I clubs, and suppliers in dispute all instruct the same group, under one rule: one interest per matter.
Get a Surveyor Moving Email the InstructionThe froth collapses after the barge leaves. Aeration inflates the sounding at delivery. Measured again after settling, with the barge still alongside, the true figure is claimable; measured next week, it is a loss.
A few degrees are worth tonnes. Temperature and density set the correction that turns volume into paid-for weight. We measure both ourselves rather than reading them off the note.
Two ROB figures, one deduction. When owner and charterer calculate different remainders, somebody pays the difference. Soundings read by an independent hand, corrected properly, close the gap.
Bissau tests the fuel account its own way. Vessels stem fuel at Bissau at the berth and at anchorage, and every stem is one of the largest single payments the ship makes in port. One independent surveyor on deck is the difference between paying for what was received and paying for what the paperwork says.
Our highly trained bunker surveyors carry out all types of bunker surveys, bunker quantity surveys, and marine fuel inspections at Bissau Port, Guinea-Bissau, through the group and its vetted network, with every attendance confirmed in writing before work begins: stems, on-hire and off-hire ROB, intermediate soundings, redelivery, shortage investigations, and MARPOL sampling, on all fuel grades. Vessels stem fuel at Bissau at the berth and at anchorage, and every stem is one of the largest single payments the ship makes in port. Also see: cargo surveyors in Bissau and marine surveyors in Bissau.
At Bissau our bunker quantity surveyors work both sides of the transfer: the vessel’s tanks and the barge’s, sounded before and after, with water-finding paste for the bottoms and our own instruments for temperature. Density is tested rather than assumed, the ASTM correction to 15°C is applied on measured figures, and the result is set against the bunker delivery note line by line. A shortfall means a letter of protest issued on the spot, not a complaint written after the barge has gone.
At delivery and redelivery in Bissau, our surveyors establish the remaining-on-board figure the settlement will use: every relevant tank sounded independently, trim and list corrections applied from the official tables, sludge and unpumpables separated from usable fuel, and the result certified with the working attached. Because condition is baselined in the same attendance, the fuel figure and the damage question are answered by the same file.
When the delivered figure and the paid-for figure refuse to meet, or fuel keeps disappearing faster than the engines burn it, the question stops being measurement and becomes investigation. Our bunker shortage investigations in Bissau follow the fuel until the numbers explain themselves.
The delivery note says one figure, the settled tanks say another. We re-sound after an enforced settling time, test density from the sample, recalculate on measured temperatures, and put the difference in a letter of protest the claim can stand on.
When burn rates outrun the engines’ appetite voyage after voyage, we audit the fuel account: soundings against log entries, bunker delivery notes against measured densities, and every transfer between tanks reconciled.
Where concealment is suspected, standard sounding is not enough. Our investigators trace the transfer piping physically, check void spaces and non-nominated tanks, verify sounding pipes against alteration, and test calibration tables against the actual steel.
Every finding is photographed, timed, and placed, and the report is written in the form P&I clubs, underwriters, and tribunals accept, so what the investigation finds, the claim can use.
Fuel quality disputes are won on the sample, and the sample is only as good as its chain of custody. Our surveyors witness the continuous drip sample at the manifold, the official point of custody transfer, then seal, label, and document it on the bunker delivery note, so the vessel holds the legal armor a Port State Control inspection or a quality dispute demands. Where off-specification fuel must come off, de-bunkering is supervised and measured with the same discipline as a delivery, so every tonne leaving the ship is accounted for.
Shipowners & managers. The fuel account defended at every stem and both ends of every charter in Bissau, with ROB figures that settle instead of argue.
Charterers & operators. Independent verification that the fuel paid for went into the tanks, and that redelivery quantities are calculated, not conceded.
Bunker buyers & traders. A surveyor on the manifold during the stem is the cheapest insurance a fuel purchase can carry: measured delivery, honest corrections, protest on the spot.
P&I clubs & correspondents. Impartial attendance, one appointment per matter, and shortage findings documented in claim-ready form the same day.
Suppliers with a dispute. When a delivery is challenged, independent measurement protects the honest party, whichever side of the manifold they stand on.
Lawyers & claims teams. Soundings, samples, photographs, and calculations tied to time and place: a fuel file built for the argument that follows.
Named surveyor, scope in writing. Before anything starts you know who attends, when, and exactly what they will do, on paper.
The fee agreed first. The fee is put in writing before work begins, so the decision is made with the numbers in front of you.
One interest per matter. If we act for the other side in your dispute, we tell you and decline. Independence is the product.
Work starts on your go-ahead. Nothing begins until you confirm in writing, and the findings reach you first, in confidence. We answer 24/7.
“The surveyor held the stem for settling when the tanks read high, and the re-sounding proved the shortfall. That one attendance paid for the year.”Charterer, Bissau
“Off-hire ROB was heading for a deduction until the joint survey corrected the trim calculation. Both sides signed the same figure.”Vessel operator, Bissau
“Density tested from the sample did not match the note. The protest was issued before the barge let go, and the invoice was corrected.”Bunker buyer, Bissau
Attendance in Bissau is arranged on instruction through the group and its vetted network, with every attendance confirmed in writing before work begins: send the vessel, the terminal or anchorage, and the stem size, and who attends, when, and on what basis is confirmed in writing before work begins.
The fee depends on the scope: the service, the stem size, and the attendances needed. Scope and fee come back in writing before work begins, and one prevented short delivery typically covers many surveys.
A bunker survey in Bissau measures the fuel independently at an agreed event: tank soundings on the vessel and the barge, temperatures and densities on calibrated instruments, correction to standard volume at 15°C, verification against the bunker delivery note, and a report with the calculations and evidence attached, with a letter of protest issued where the figures do not hold.
Yes. Where the delivery is already signed, our shortage investigation reconstructs the fuel account from soundings, logs, delivery notes, and samples, and where concealment is suspected an investigative 221B survey physically traces the piping and checks non-nominated spaces. The earlier we attend, the more evidence survives.
When precision matters, your partner of choice
Send the vessel, the terminal or anchorage, the ETA, and the stem size, and we confirm who attends, when, and on what basis, in writing, before anything starts.
Get a Surveyor Moving Email the InstructionThe same group, the same report standard, along the same trade routes: Bunker surveyors in Banjul · Bunker surveyors in Conakry · Bunker surveyors in Dakar · Bunker surveyors in Kamsar.
International Marine Cargo Surveyors, Claims Handlers and Technical Consultants in Africa. On-ground expertise, global reach: anywhere you go in Africa, we are already there, with capacity to serve globally.
Observater Surveys and Services Group · ops@observater.com · All attendances are performed under our standard terms of business, available on request. Also see: Cargo Surveyors in Bissau · Marine Surveyors in Bissau · Africa bunker desk · Africa Bunker Survey Experts · Bunker Surveys in Djibouti.
When precision matters, Observater Surveys Group is your Partner of Choice
© 2026 Observater Surveys and Services Group. All rights reserved.