Viswa Group in it’s recent technical update, alerts about identifying 7 LSMGO samples with low viscosity distillate fuels in US ports.
Viswa has received 7 LSMGO (Low Sulfur Marine Gas Oil) samples from bunkering in the ports of Norfolk, Chesapeake, and Newport News Virginia. All 7 supplies were made by two bunker suppliers.
On the basis of testing in the lab, it was found that the Viscosity @ 40degC for these samples varies from 1.65 cSt to 1.88 cSt.
Minimum viscosity for DMA grade
The minimum viscosity for DMA grade
- in ISO 8217:2017 and ISO 8217:2010/2012 is 2.0 cSt and
- in ISO 8217:2005 is 1.5 cSt.
Recommended lowest limit
However, it is well known that all Engine Makers recommend that the lowest limit for viscosity @ 40degC should be at least 2 cst at the Engine Inlet.
Fitting of chillers
If this is not present, they recommend fitting of chillers or to carry out some blending to increase the viscosity of the fuel.
What is the risk?
Using fuels with less than 2 cst viscosity is likely to cause jamming of the engine fuel pump or the boiler fuel pump.
Kindy consider placing the suppliers on notice if you are experiencing any problems.
You may also advise the suppliers of the tolerance of the 2 cSt when they make fresh bunker supplies. If you placed orders as per ISO 8217:2005, please make sure you amend the purchase order to mention a minimum of 2cSt viscosity @ 40degC.
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