D6 Virgin Fuel Oil Specifications: Quality Data Sheet

D6 Virgin Fuel Oil Specifications: Quality Data Sheet provides the complete ISO 8217:2017 parameter table for virgin residual grades RMG 380 through RMK 700 alongside the practical interpretation buyers need to verify a Certificate of Analysis before opening a letter of credit. The guide maps every mandatory limit from kinematic viscosity and density to vanadium aluminum silicon and the calcium zinc phosphorus triad that flags Used Lubricating Oil contamination. You will learn how to distinguish straight-run virgin residue from reprocessed cutter stock blends using elemental ratios and boiling curve consistency. The article explains the two compliance pathways created by IMO 2020: VLSFO grades RMG 380 and RMG 500 for non-scrubber fleets at 0.50% sulfur versus HSFO grades RMG 380 through RMK 700 for scrubber-equipped vessels at 3.50% sulfur. You will see actionable reject thresholds for ULO markers chemical waste indicators and stability reserve depletion plus the CCAI calculation walkthrough and cold flow management rules for winter transits.

ISO 8217:2017 Virgin Residual Grades (RMG/RMK 380-700) Full Parameter Table

The previous global limit on sulphur in ships' fuel oil was 3.5% according to IMO. This table maps the complete ISO 8217:2017 specification limits for virgin residual grades RMG 380 through RMK 700 against typical virgin values and the required ASTM or IP test methods. Buyers use this matrix to verify that a Certificate of Analysis (CoA) covers every mandatory parameter before opening a letter of credit.

Parameter	RMG 380 Limit	RMG 500 Limit	RMK 380 Limit	RMK 500 Limit	RMK 700 Limit	Test Method (ASTM/IP)
Kinematic Viscosity at 50°C (mm²/s)	Max 380	Max 500	Max 380	Max 500	Max 700	D445 / IP 71
Density at 15°C (kg/m³)	Max 991.0	Max 991.0	Max 1010.0	Max 1010.0	Max 1010.0	D1298 / IP 160
CCAI	Max 870	Max 870	Max 870	Max 870	Max 870	Calculated
Sulfur (% m/m)	Max 3.50	Max 3.50	Max 3.50	Max 3.50	Max 3.50	D4294 / IP 336
Pour Point (Summer/Winter) °C	Max 30 / 30	Max 30 / 30	Max 30 / 30	Max 30 / 30	Max 30 / 30	D97 / IP 15
Flash Point (°C)	Min 60	Min 60	Min 60	Min 60	Min 60	D93 / IP 34
Water (% V/V)	Max 0.5	Max 0.5	Max 0.5	Max 0.5	Max 0.5	D95 / IP 74
Ash (% m/m)	Max 0.10	Max 0.10	Max 0.15	Max 0.15	Max 0.15	D482 / IP 4
Vanadium (mg/kg)	Max 150	Max 150	Max 350	Max 350	Max 350	D5863 / IP 501
Aluminum + Silicon (mg/kg)	Max 60	Max 60	Max 60	Max 60	Max 60	D5184 / IP 501
Sodium (mg/kg)	Max 50	Max 50	Max 100	Max 100	Max 100	D5863 / IP 501
Calcium (mg/kg)	Max 30	Max 30	Max 30	Max 30	Max 30	D5184 / IP 501
Zinc (mg/kg)	Max 15	Max 15	Max 15	Max 15	Max 15	D5184 / IP 501
Phosphorus (mg/kg)	Max 15	Max 15	Max 15	Max 15	Max 15	D5184 / IP 501

Reading the table left to right shows the step change in density allowance between RMG and RMK grades and the tighter vanadium cap on the lower density series. Aluminum plus silicon is fixed at 60 mg/kg across all grades because it signals catalytic fines that damage fuel pumps regardless of viscosity. Calcium zinc and phosphorus share a 15 to 30 mg/kg ceiling; any result above these thresholds flags used lubricating oil contamination. A buyer should confirm the lab used the listed IP or ASTM method because alternative methods can produce non comparable results.

Virgin vs Non-Virgin: Feedstock Definition and ULO Contamination Markers

Straight-Run Residual Feedstock vs Reprocessed Cutter Stock

Virgin D6 fuel oil originates exclusively from the atmospheric and vacuum distillation residue of crude oil without any reprocessed cutter stock added. Non virgin grades often contain cracked residues or re refined cutter stocks blended to meet viscosity targets. The presence of reprocessed material changes the hydrocarbon structure increasing aromaticity and instability. A true virgin cargo will show a consistent boiling curve and absence of olefinic compounds typical of catalytic cracking. Refiners certify virgin status by documenting the straight run residue tank source and the absence of visbreaker or coker feeds in the blend recipe.

Calcium Zinc Phosphorus Thresholds for ULO Detection

Calcium zinc and phosphorus are the primary elemental markers for Used Lubricating Oil (ULO) contamination in residual fuel. Virgin residual fuel typically shows calcium below 30 mg/kg zinc below 15 mg/kg and phosphorus below 15 mg/kg. Elevated calcium above 30 mg/kg combined with zinc above 15 mg/kg indicates detergent additive packages from crankcase oils. Phosphorus above 15 mg/kg signals anti wear additives such as ZDDP. Labs report these via ICP AES using ASTM D5184 or IP 501. A single element spike may come from a crude source but simultaneous elevation of all three confirms ULO blending.

Iron Nickel and Vanadium Ratios Indicating Catalytic Fines

Iron nickel and vanadium ratios distinguish refinery catalytic fines from crude sourced metals. Virgin fuel contains vanadium and nickel naturally present in the crude as porphyrins typically at a V Ni ratio of 3 to 1 or higher. Iron in virgin fuel is usually below 15 mg/kg originating from corrosion products. Catalytic fines from fluid catalytic cracking units introduce high iron and aluminum with low vanadium shifting the V Ni ratio below 2. Silicon accompanies aluminum in a 1 to 1 ratio from the zeolite catalyst matrix. Buyers should request the full metals profile not just the Al Si sum to diagnose the contamination source.

Element	Virgin Typical (mg/kg)	ULO Alert Threshold (mg/kg)	Catalytic Fine Indicator	Primary Source
Calcium	< 30	> 30	No	Crude / Detergent Additive
Zinc	< 15	> 15	No	Anti Wear Additive (ZDDP)
Phosphorus	< 15	> 15	No	Anti Wear Additive (ZDDP)
Iron	< 15	Variable	Yes (with Al)	Corrosion / Catalyst
Vanadium	50 350	Variable	No	Crude Porphyrins
Nickel	10 80	Variable	No	Crude Porphyrins
Aluminum	< 30	Variable	Yes (with Si)	Catalyst Zeolite
Silicon	< 30	Variable	Yes (with Al)	Catalyst Zeolite

The table separates crude derived metals from additive and catalyst markers. Calcium zinc and phosphorus act as the ULO fingerprint because they do not occur naturally in crude residue at those concentrations. Iron aluminum and silicon together identify mechanical wear or catalytic carryover. Vanadium and nickel ratios confirm the crude assay consistency. A cargo failing the calcium zinc phosphorus screen should be rejected for virgin specification regardless of viscosity or sulfur compliance.

MARPOL Annex VI and IMO 2020: VLSFO vs HSFO Grade Selection

The upper limit of the sulphur content of ships' fuel oil was reduced to 0.5% under IMO 2020 according to IMO. This regulatory shift created two distinct compliance pathways for D6 virgin fuel oil buyers. Vessels without exhaust gas cleaning systems must burn Very Low Sulphur Fuel Oil (VLSFO) meeting the ISO 8217 RMG 380 or RMG 500 grades with a maximum sulphur limit of 0.50% m/m. Vessels fitted with scrubbers continue to burn High Sulphur Fuel Oil (HSFO) grades RMG 380 through RMK 700 with a maximum sulphur limit of 3.50% m/m. The grade selection dictates the entire procurement specification from viscosity and CCAI to pour point and stability reserve.

VLSFO RMG 380/500 Specifications for Non-Scrubber Fleets

VLSFO RMG 380 and RMG 500 are the standard virgin grades for non-scrubber fleets requiring 0.50% m/m sulphur compliance according to IMO (2020). These grades demand a kinematic viscosity at 50°C of 380 mm²/s and 500 mm²/s maximum respectively. The CCAI limit is capped at 870 for both grades ensuring ignition quality suitable for modern low-speed two-stroke engines. Pour point limits are set at 30°C maximum for winter and 0°C maximum for summer grades to prevent wax crystallization in cooler trading routes. Buyers must verify the total sediment aged (TSA) limit of 0.10% m/m which protects against stability issues common in cracked component blends according to U.S. EIA (2022). Virgin VLSFO cargoes should show negligible calcium zinc and phosphorus confirming the absence of used lubricating oil contamination.

HSFO RMG/RMK 380-700 Specifications for Scrubber-Equipped Vessels

HSFO grades RMG 380 through RMK 700 serve scrubber-equipped vessels operating under the 3.50% m/m sulphur ceiling according to IMO (before 2020). The RMK 550 and RMK 700 grades allow higher viscosity maximums of 550 mm²/s and 700 mm²/s at 50°C catering to engines designed for heavier residues. CCAI limits remain at 870 across the HSFO range preserving ignition quality. Vanadium limits are critical in HSFO with ISO 8217 setting a maximum of 350 mg/kg for RMG grades and 450 mg/kg for RMK grades to control high temperature corrosion. Sodium limits of 50 mg/kg maximum indicate seawater contamination risk during loading or storage. Virgin HSFO must demonstrate a stable asphaltene profile with TSA below 0.10% m/m and a strong stability reserve to withstand long voyage storage at elevated temperatures according to U.S. EIA (2022).

ISO 8217 Table 2 Parameter Differences Between VLSFO and HSFO

ISO 8217 Table 2 distinguishes VLSFO and HSFO primarily through the sulphur limit and the resulting blending constraints. VLSFO grades require severe hydrotreating or blending with low sulphur distillates which reduces the natural stability reserve compared to straight-run HSFO. This makes the Total Sediment Potential (TSP) test more critical for VLSFO cargoes. HSFO grades tolerate higher cat fines limits (Al+Si 60 mg/kg for RMG/RMK vs 50 mg/kg for RMG 380 VLSFO in some interpretations) but buyers should contractually enforce a 30 mg/kg Al+Si limit for both categories to protect injectors. The hydrogen sulphide (H2S) limit of 2.00 mg/kg applies universally to both VLSFO and HSFO ensuring tank headspace safety. For detailed grade comparisons see LPFO vs HFO specifications grades trading differences.

Critical Quality Red Flags: Interpreting Lab Reports for Contamination

Identifying Used Lubricating Oil (ULO) contamination in D6 virgin fuel oil lab reports requires a disciplined review of specific elemental markers. Calcium zinc and phosphorus form the primary ULO fingerprint because they originate from detergent and anti-wear additives (ZDDP) absent in crude residue. A decision matrix using pass fail investigate thresholds allows buyers to reject blended cargoes before loading. Chemical waste markers such as potassium chlorine and organic chlorides indicate hazardous waste blending. Stability reserve depletion signals potential asphaltene precipitation during storage. The following table provides the actionable thresholds for each contamination vector.

ULO Contamination Decision Matrix: Ca Zn P Fe Pass Fail Investigate

Element	Virgin Typical (mg/kg)	Investigate Threshold (mg/kg)	Reject Threshold (mg/kg)	Primary Source
Calcium	< 5	> 15	> 30	Detergent Additive
Zinc	< 2	> 5	> 15	Anti Wear Additive (ZDDP)
Phosphorus	< 2	> 5	> 15	Anti Wear Additive (ZDDP)
Iron	Variable	> 20 (with Al Si)	> 50 (with Al Si)	Corrosion / Catalyst

The table separates crude derived metals from additive and catalyst markers. Calcium zinc and phosphorus act as the ULO fingerprint because they do not occur naturally in crude residue at those concentrations. A cargo exceeding 30 mg/kg calcium or 15 mg/kg zinc or phosphorus should be rejected for virgin specification regardless of viscosity or sulphur compliance. Iron requires correlation with aluminum and silicon to distinguish corrosion from catalytic fines. Buyers should insert these thresholds into the sale contract as binding rejection criteria with pre-shipment inspection hold points.

Chemical Waste Markers: Potassium Chlorine and Organic Chlorides

Potassium and chlorine are strong indicators of chemical waste or chlorinated solvent blending into fuel oil. Virgin residue typically shows potassium below 5 mg/kg and total chlorine below 50 mg/kg. Levels above 15 mg/kg potassium or 100 mg/kg chlorine trigger an investigation for waste derived feedstock. Organic chlorides are particularly damaging as they hydrolyze to hydrochloric acid in the preheat train causing severe corrosion in heaters and fuel lines. A specific organic chloride test (ASTM D7359 or IP 570) should be requested when total chlorine exceeds 50 mg/kg. Any detection of organic chlorides above 5 mg/kg warrants immediate cargo rejection as it indicates deliberate hazardous waste disposal through the fuel supply chain.

Stability Reserve Depletion: Asphaltene Precipitation Warning Signs

According to U.S. EIA (2022), a TSP value above 0.05% m/m indicates the cargo has limited tolerance for commingling or temperature cycling. The spot test (ISO 10307-2) provides a rapid field assessment; a rating of 1 or 2 suggests instability requiring immediate segregation. Virgin fuel with a strong reserve typically shows TSA below 0.03% m/m and TSP below 0.02% m/m. Buyers should track the reserve ratio (TSP/TSA) across sequential bunker stem receipts to detect gradual blending of unstable components into the supply stream. For regulatory context on fuel standards see petroleum product specifications standards regulatory guide.

CCAI Calculation and Ignition Quality Troubleshooting

CCAI Formula Walkthrough with Density and Viscosity Inputs

The Calculated Carbon Aromaticity Index (CCAI) is derived from the formula: CCAI = Density at 15°C - 81 - (141 × log10(log10(Viscosity at 50°C + 0.85))) where viscosity is in centistokes and density is in kg/m³. A CCAI below 840 indicates good ignition quality for residual grades while values above 870 signal high aromaticity and potential combustion issues. The calculation requires precise kinematic viscosity at 50°C and density at 15°C from the Certificate of Analysis. Small errors in viscosity measurement disproportionately affect the logarithmic term so laboratories must use calibrated viscometers per ISO 3104. For RMG 380 the typical CCAI range falls between 820 and 850. Always verify the reference temperature used by the lab as some reports quote viscosity at 100°C requiring conversion before the formula applies.

Ignition Delay Risks for Slow-Speed Two-Stroke Engines

Slow-speed two-stroke engines tolerate higher CCAI values up to approximately 870 due to long ignition delay periods inherent in their operating cycle. However elevated CCAI extends the delay further causing peak cylinder pressures to rise after top dead center which reduces thermal efficiency and increases specific fuel oil consumption. Excessive ignition delay also promotes after-burning raising exhaust valve temperatures and thermal loading on piston crowns. Operators should monitor exhaust valve seat wear rates and cylinder liner wear as early indicators of chronic high-CCAI operation. When CCAI approaches 860 consider advancing fuel injection timing by 1 to 2 degrees if the engine control system permits. Verify the fuel injection pump rack position and nozzle condition first as worn components amplify ignition quality sensitivity.

Medium-Speed Four-Stroke Engine Combustion Optimization

Medium-speed four-stroke engines are significantly more sensitive to ignition quality requiring CCAI values below 850 for stable combustion. High CCAI fuels cause rough running increased cylinder pressure deviations between units and difficulty maintaining load balance. The shorter compression stroke and higher rotational speed leave minimal time for fuel-air mixing before auto-ignition. Install a fuel oil treatment system capable of maintaining injection viscosity at 13 to 17 cSt to optimize atomization which partially compensates for poor ignition quality. Monitor turbocharger surging and scavenge air pressure fluctuations as combustion instability indicators. If CCAI exceeds 855 consider blending with a lower aromaticity cutter stock or requesting a fuel change at the next port. Regular indicator card analysis detects early combustion deviation trends before mechanical damage occurs.

Cold Flow Properties: Pour Point vs CFPP and Wax Crystallization Risks

Pour Point Significance for Tank Heating and Pumpability

Pour point defines the lowest temperature at which the fuel oil still flows under standard test conditions (ISO 3016). For D6 virgin grades the pour point typically ranges from 30°C to 45°C depending on the crude source and refinery process. This parameter dictates the minimum bulk storage tank heating temperature which must be maintained at least 10°C above the pour point to ensure pumpability at the suction strum. During winter transits through temperate zones tank heating coils must be sized to maintain this margin against sea water cooling effects. A pour point of 36°C requires a minimum tank temperature of 46°C. Verify the pour point on the Certificate of Analysis matches the contractual specification as some suppliers quote upper pour point limits that may still challenge cold weather operations. Insulated tank coatings reduce steam consumption for maintaining this differential.

CFPP Relevance for Filterability in Cold Climates

Cold Filter Plugging Point (CFPP) per IP 309 or ASTM D6371 measures the temperature at which wax crystals block a standardized wire mesh filter under controlled cooling. For heavy fuel oil CFPP is typically 5°C to 15°C higher than the pour point because the test captures the onset of crystal agglomeration that restricts flow through fine mesh. This metric is critical for vessels operating in arctic or sub-arctic waters where fuel passes through fine filters (10 to 25 micron) immediately before injection pumps. A CFPP of 50°C means filters will plug if fuel temperature drops below this threshold regardless of bulk tank temperature. Install fuel oil heaters immediately upstream of the fine filters sized for the maximum flow rate at the minimum expected fuel inlet temperature. Monitor differential pressure across filters continuously during cold weather transits.

Wax Crystallization Management During Winter Transits

Wax crystallization begins at the Cloud Point which for D6 grades often exceeds 50°C. As temperature drops paraffin molecules precipitate forming a crystal lattice that increases viscosity exponentially and creates a gel structure. Manage this risk by maintaining fuel temperature throughout the entire system from storage tanks through settling tanks service tanks and piping to at least 10°C above the measured pour point. Use steam tracing on deck lines and insulated lagging on all fuel piping exposed to ambient conditions. During extended port stays in cold climates recirculate fuel through the heater continuously rather than allowing static cooling in service tanks. If wax deposition occurs do not apply direct steam to cold lines as thermal shock can crack piping; instead gradually raise system temperature using the fuel oil heaters while monitoring viscosity at the engine inlet. Chemical pour point depressants are generally ineffective on heavy residual fuels due to high asphaltene content interfering with polymer action.

Handling Pre-Heating and Injection Viscosity Targets (10-20 cSt)

What are the heating temperature requirements for D6 fuel oil storage transfer and injection to achieve 10-20 cSt viscosity? Achieving the correct injection viscosity of 10 to 20 centistokes requires precise temperature management across the entire fuel system from storage to engine inlet. The viscosity of residual fuel drops exponentially with temperature so a 5°C deviation at the injector can double or halve the actual viscosity delivered to the combustion chamber. Operators must maintain storage tanks near the minimum pumping temperature typically 40°C to 50°C for RMG 380 and 50°C to 60°C for RMK 700. Transfer lines and purifier feed require 60°C to 80°C to ensure separator efficiency. Final heaters must be controlled by a viscosity controller at the engine inlet rather than a fixed temperature setpoint because fuel quality variations shift the temperature viscosity curve.

Storage Transfer Purifier and Injector Temperature Targets by Grade

Storage Transfer Purifier and Injector Temperature Targets by Grade depend on the specific ISO 8217 viscosity grade because higher viscosity grades require higher temperatures to reach the 10 to 20 cSt injection window. For RMG 380 the typical storage temperature is 40°C to 50°C, purifier feed 70°C to 85°C, and injector target 125°C to 135°C. For RMK 700 storage requires 50°C to 60°C, purifier feed 80°C to 95°C, and injector 135°C to 145°C. These targets assume a viscosity index typical of straight run residues; cracked residues may need 5°C to 10°C higher temperatures at the injector. Always verify the actual temperature viscosity curve from the Certificate of Analysis before setting controller setpoints. No. 6 residual fuel oil has a minimum flash point of 140 °F according to U.S. EPA (current definition).

ISO 8217 Grade	Storage Temp (°C)	Transfer/Purifier Feed Temp (°C)	Injector Target Temp (°C)	Target Viscosity at Injector (cSt)
RMG 380	40 - 50	70 - 85	125 - 135	10 - 20
RMK 700	50 - 60	80 - 95	135 - 145	10 - 20

The table above summarizes the minimum heating temperatures required at each system stage to achieve the 10 to 20 cSt injection viscosity window for the three most common D6 virgin grades. Note that injector temperatures are indicative; the viscosity controller must override fixed temperature setpoints to compensate for actual fuel viscosity variations. Purifier feed temperatures assume conventional centrifugal separation; modern high efficiency separators may operate effectively at slightly lower feed temperatures reducing thermal stress on the fuel.

Viscosity Management Strategy for 380 500 and 700 cSt Grades

Viscosity Management Strategy for 380 500 and 700 cSt Grades centers on using the engine mounted viscometer as the primary control variable rather than heater outlet temperature. Install a capillary or vibrational viscometer on the engine inlet manifold with a PID controller driving the final heater steam or thermal oil valve. Set the controller setpoint to 13 cSt for RMG 380, 14 cSt for RMG 500, and 15 cSt for RMK 700 to provide margin against measurement drift. Maintain the fuel temperature in the service tank at least 10°C above the measured pour point to prevent wax crystallization during standby. Monitor the differential temperature across the final heater; a rise exceeding 30°C indicates fouling or excessive flow rate reducing heat transfer efficiency. Record viscometer readings at every watch and correlate with exhaust gas temperatures to detect early injector coking.

Tank Cleaning Standards and Previous Cargo Compatibility

Tank Cleaning Standards and Previous Cargo Compatibility are critical because residual cargoes can drastically alter the viscosity temperature relationship of the subsequent virgin parcel. Tanks previously carrying lubricating oils, vegetable oils, or chemical residues must be cleaned to a "Water White" standard verified by visual inspection and hydrocarbon vapor meter readings below 1% LEL. Tanks switching from HSFO to VLSFO or between different viscosity grades require a "Clean on Inspection" standard with all loose scale removed. Never load RMG 380 into a tank that previously held RMK 700 without full cleaning because the higher viscosity residue increases the blend viscosity beyond the 380 cSt limit at 50°C. Document the previous three cargoes and cleaning method in the tank cleaning certificate presented to the surveyor during loading.

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Related reading: Top 10 B2B Websites to Buy Jet Fuel in Bulk.

Conclusion

Verify every Certificate of Analysis against the full ISO 8217:2017 parameter table before opening a letter of credit, confirming that viscosity, density, CCAI, sulfur, pour point, flash point, water, ash, vanadium, aluminum plus silicon, sodium, calcium, zinc and phosphorus all fall within the limits for the contracted RMG or RMK grade. Apply the ULO decision matrix as binding rejection criteria: investigate at calcium above 15 mg/kg, zinc above 5 mg/kg or phosphorus above 5 mg/kg and reject outright when calcium exceeds 30 mg/kg, zinc exceeds 15 mg/kg or phosphorus exceeds 15 mg/kg regardless of viscosity or sulfur compliance.

The upper limit of the sulphur content of ships' fuel oil was reduced to 0.5% under IMO (2020) and the previous global limit on sulphur in ships' fuel oil was 3.5% under IMO (before 2020). For winter transits, set tank heating at least 10°C above the measured pour point and confirm Cold Filter Plugging Point for arctic operations. Start your supplier search on Global Trade Plaza to compare verified CoA documents against these specifications.

Frequently Asked Questions

d6 virgin fuel oil specifications pdf?

The complete ISO 8217 parameter table for virgin residual grades RMG 380 through RMK 700 is embedded in the article above. It lists every mandatory limit from kinematic viscosity and density to vanadium, aluminum, silicon, and the calcium-zinc-phosphorus triad alongside the required ASTM or IP test methods.

what is d6 virgin fuel oil used for?

D6 virgin fuel oil powers large marine diesel engines and stationary power plants. Non-scrubber vessels burn VLSFO grades RMG 380 or RMG 500 at 0.50% sulfur while scrubber-equipped vessels burn HSFO grades RMG 380 through RMK 700 at 3.50% sulfur.

d6 fuel oil specifications?

ISO 8217 defines mandatory limits for viscosity at 50°C (380, 700 mm²/s), density at 15°C (max 991, 1010 kg/m³), CCAI (max 870), sulfur (max 3.50% for HSFO, 0.50% for VLSFO), pour point, flash point (min 60°C), water, ash, vanadium, aluminum+silicon, sodium, calcium, zinc, and phosphorus.

d6 virgin fuel oil specifications requirements pdf?

The article provides the full specification matrix with test methods (ASTM D445, D1298, D4294, D97, D93, D95, D482, D5863, D5184 and IP equivalents). Buyers verify a Certificate of Analysis covers every parameter before opening a letter of credit.

d6 virgin fuel oil specifications documents pdf?

Key documents are the Certificate of Analysis from an ISO 17025 lab using the listed ASTM/IP methods, the Bill of Lading, the vessel’s Bunker Delivery Note (BDN) per MARPOL Annex VI, and the Manufacturer’s Certificate of Origin confirming straight-run residue feedstock.

d6 virgin fuel oil specifications documents required?

A letter of credit typically requires the commercial invoice, full set of clean on-board Bills of Lading, Certificate of Origin, Certificate of Analysis covering all ISO 8217 Table 2 parameters, BDN, and a Quantity/Quality Certificate from an independent inspector at load port.

d6 virgin fuel oil specifications costs?

Specification compliance drives price differentials; VLSFO grades command a premium over HSFO due to hydrotreating or low-sulfur distillate blending. Testing costs for the full ISO 8217 suite run approximately $800, $1,200 per cargo at major hubs like Rotterdam or Singapore.

d6 virgin fuel oil specifications costa rica?

Costa Rica follows MARPOL Annex VI and ISO 8217 for marine fuels. Imported D6 must meet the same RMG/RMK grade limits; local distributors typically supply RMG 380 VLSFO for non-scrubber vessels calling at Puerto Limón or Caldera.

d6 oil specifications?

D6 residual fuel specifications are governed by ISO 8217 Table 2 for grades RMG 380 through RMK 700. The standard covers viscosity, density, CCAI, sulfur, pour point, flash point, water, ash, and trace metals including vanadium, aluminum+silicon, sodium, calcium, zinc, and phosphorus.

How to identify Used Lubricating Oil (ULO) contamination in D6 virgin fuel?

ULO contamination is confirmed when calcium exceeds 30 mg/kg combined with zinc above 15 mg/kg and phosphorus above 15 mg/kg. A single element spike may reflect crude source but simultaneous elevation of all three indicates detergent and anti-wear additives from crankcase oil.

What are the heating temperature requirements for D6 fuel oil storage and transfer?

Maintain storage tank temperature at least 10°C above the measured pour point. Transfer lines and settler tanks should be held at a viscosity of 150, 180 mm²/s (typically 50, 60°C for RMG 380) to ensure proper centrifuging and injection viscosity.

Which test methods (ASTM/IP) verify ISO 8217 D6 specifications?

Key methods include ASTM D445/IP 71 (viscosity), D1298/IP 160 (density), D4294/IP 336 (sulfur), D97/IP 15 (pour point), D93/IP 34 (flash point), D95/IP 74 (water), D482/IP 4 (ash), D5863/IP 501 (vanadium, sodium), and D5184/IP 501 (Al+Si, Ca, Zn, P).

What documents are required for a D6 virgin fuel oil letter of credit transaction?

Standard LC documents: commercial invoice, full set of clean on-board Bills of Lading, Certificate of Origin, Certificate of Analysis covering all ISO 8217 mandatory parameters, Bunker Delivery Note (MARPOL), and independent inspector’s Quantity/Quality Certificate at load port.

Sources

• IMO (2020): IMO global marine fuel sulphur limit
• U.S. EIA (2022): North American and U.S. Caribbean ECA marine fuel sulfur limit
• U.S. EPA (current definition): Residual Fuel Oil No. 6 (Bunker C) flash point