Tugs, offshore support vessels (OSVs), dredgers, harbour craft, fishing vessels, inland and coastal vessels, and Coast Guard / naval craft running high-speed diesel engines.
What HFHSD Is — and Why "High Flash"
HFHSD is High Speed Diesel produced to a higher flash point for marine use. Ordinary automotive high speed diesel has a low flash point and can ignite at storage temperatures, which makes it unsafe — and not permitted — as a shipboard fuel. Marine safety rules require a minimum flash point of 60°C, so HFHSD is refined to a high-flash specification and standardised in India under IS 16861. The defence variant, HFHSD-IN 512, is built to even tighter naval norms.
Why Coastal Operators Ask for HSD, Not MGO
Deep-sea ships nominate ISO 8217 grades — MGO, LSMGO, VLSFO. India's coastal and offshore fleet is different: tugs, OSVs, dredgers, harbour craft and fishing vessels run high-speed diesel engines and operate domestically, so they buy the Indian high-speed-diesel grade and ask for it by name — "HSD" or "HFHSD." It is a distillate like marine gas oil, but the specification, the terminology and the supply chain are domestic rather than international.
HFHSD vs MGO / LSMGO
All three are distillate fuels, and marine-grade HFHSD sits very close to LSMGO on specification — both are low-sulphur distillates. The difference is which world the vessel lives in: a vessel on international voyages nominates MGO or LSMGO to an ISO 8217 specification, while a tug, OSV or dredger working Indian waters takes HFHSD to the Indian BIS specification. The right grade depends on the engine, the vessel's trade and the nomination — and getting that call right is part of what a procurement partner does.
Specifications and Emissions
Marine-grade HFHSD has specifications broadly comparable to LSMGO — it is a low-sulphur marine distillate. That keeps combustion clean, reduces particulate and stack emissions, and lowers long-term wear on injectors and fuel systems compared with heavier or higher-sulphur fuels.
Where to Bunker HFHSD
HFHSD is available across India's major commercial ports on both coasts. Representative ports where we arrange HFHSD and high-speed-diesel stems:
Frequently Asked Questions
What is HFHSD?
HFHSD stands for High Flash High Speed Diesel — a high-speed diesel with an elevated flash point specified for marine use under Indian Standard IS 16861. The high flash point makes it safe to store and use aboard vessels, unlike ordinary automotive high speed diesel.
Is HFHSD the same as HSD or MGO?
HFHSD is the high-flash, marine-grade version of HSD (High Speed Diesel). It is a distillate, broadly comparable in role to marine gas oil, but specified to Indian BIS standards for high-speed engines rather than to the ISO 8217 MGO/DMA specification used in deep-sea bunkering. Coastal and offshore operators in India typically ask for it as HSD or HFHSD.
Why do tugs and offshore vessels use HFHSD instead of MGO?
Tugs, offshore support vessels, dredgers and harbour craft run high-speed diesel engines and operate domestically, so they buy the Indian high-speed-diesel grade — HFHSD — rather than the internationally-traded MGO/LSMGO that deep-sea ships nominate. The terminology and the supply chain are different even though both are distillates.
Why does it need a high flash point?
Ordinary automotive high speed diesel has a low flash point and can ignite at storage temperatures, which is unsafe and not permitted for shipboard fuel. Marine safety rules require a minimum flash point of 60°C, so HFHSD is produced to a higher flash specification for safe use at sea.
Which Indian ports supply HFHSD?
HFHSD is available across India's major commercial ports on both coasts. As an independent procurement partner, Seven Ocean arranges HFHSD stems at the port that suits the vessel's call — confirmed per nomination.