Bunker Survey Services in Valencia, Spain
VALENCIA Marine Services provides independent bunker survey services in Spain for merchant vessels and commercial units. We support shipowners, charterers, traders, P&I Clubs, and insurers with accurate quantity verification and evidence-grade reporting during marine fuel operations.
Bunker Quantity Survey (BQS)
A Bunker Quantity Survey (BQS) is an independent verification process that determines the actual quantity of marine fuel delivered and received onboard a vessel through structured measurement and calculation procedures.
OBQ / ROB Survey (Charter Delivery & Redelivery)
An OBQ / ROB Survey establishes the precise quantity of fuel onboard a vessel at charter delivery or redelivery, ensuring contractual transparency between shipowners and charterers.
Detective Bunker Survey (Fuel Discrepancies & Claims Support)
A Detective Bunker Survey is a technical investigation conducted when discrepancies arise between declared and measured fuel quantities, providing structured analysis and documentation for commercial or insurance claims.
SERVICE 1
Bunker Quantity Survey (BQS)
A Bunker Quantity Survey (BQS) determines the actual fuel quantity delivered and received onboard through independent technical verification
What the BQS typically includes
Tank measurements before and after supply (ullage/sounding as applicable)
Verification of tank calibration tables
Volumetric calculations with temperature correction
Density determination and application of conversion factors
Supervision of fuel transfer operations and key procedural checks
Reconciliation against declared quantities and BDN values
Why it matters
BQS reduces the risk of:
Quantity shortages
Documentation disputes
SERVICE 2
OBQ / ROB Survey During Charter Changes
During charter delivery and redelivery, accurate fuel determination is essential for contractual transparency.
Definitions
ROB (Remaining On Board): fuel remaining at the end of the contract
OBQ (On Board Quantity): fuel onboard at delivery into the new charter
What we do
Independent measurement of onboard quantities
Transparent calculation methodology
Clear documentation for contractual settlement
SERVICE 3
Detective Bunker Survey (Discrepancies & Claims)
A Detective Bunker Survey is conducted when significant differences arise between declared and measured quantities, or when operational irregularities are suspected.
The assessment may include
Verification of bunkering procedures and timeline
Inspection of accessible pipelines, valves, and manifold arrangements
Review of operational records and documentation
Technical evaluation of potential losses, errors, or irregularities
Typical use cases
Shortage claims
Charter party disputes
Insurance and P&I documentation support
METHODOLOGY
Applied Technical Methodology (Defensible Results)
We apply a clear technical workflow designed for transparency and auditability.
Methodology may include
Manual and electronic tank measurements
Certified or verified sounding equipment use
Temperature and density corrections
Calibration table verification
Calculation reconciliation and anomaly notes
Deliverable
A structured technical report with a clear calculation trail.
VESSELS
Services by Vessel Type
This service is primarily provided for:
Merchant vessels and commercial units
Tankers
Container ships
Bulk carriers
Ferries
Large yachts & specialised units (case-by-case, high-value operations)
PORTS
Ports Covered in Spain (Mediterranean)
We attend bunker operations across Spanish Mediterranean ports, including:
Mediterranean Ports
Barcelona
Tarragona
Castellón
Valencia
Alicante
Cartagena
Other Ports
Attendance at other Spanish ports may be arranged upon request, depending on logistics and schedule.
REPORT
What You Receive — Bunker Survey Technical Report
We attend bunker operations across Spanish Mediterranean ports, including:
Report
Your report typically includes:
Recorded measurements (pre/post)
Applied calculations and correction factors
Technical observations and anomalies
Final quantity determination
Photo support where available/allowed
Documentation
This documentation is suitable for:
Commercial settlement
Charter delivery/redelivery reconciliation
Claims support and dispute resolution
FAQs
Everything you need to know now
What is a Bunker Quantity Survey (BQS)?
An independent verification of delivered/received fuel quantity based on tank measurements before and after supply and corrected volumetric calculations.
When do I need an OBQ/ROB survey?
At charter delivery/redelivery or any handover where fuel quantity impacts settlement between parties.
When is a detective bunker survey required?
When there is a material discrepancy between declared and measured quantities or when procedural anomalies require technical investigation.
Request Attendance / Get a Quote
To confirm availability and quote accurately, please send:
Vessel name + IMO (if available)
Port + ETA/ETB
Fuel grades and expected quantities (MT)
Supply method (barge/shore/truck/STS)
Required service (BQS / OBQ-ROB / Detective)
VALENCIA Marine Services
Camino del Canal 91 Real Club Náutico de Valencia Block 3 Office 21 Valencia 46024 (SPAIN)
© 2026 VALENCIA Marine Services
