Bad Bunkers Warning in US Gulf

The United States Coast Guard (USCG) has warned of bunker contamination problems that can result in serious engine damage. 

In their Marine Safety Alert, the USCG raises awareness of the recent problems experienced with the residual marine fuel IFO 380 bunkered from ports in the US Gulf.

A significant number of vessels have experienced clogging of filters and in more extreme cases engine damage, in particular fuel pump seizures.

The contaminant has been identified as the phenolic compound 4-Cumyl-Phenol. This compound has adhesive (sticky) characteristics and is commonly used in the manufacture of epoxy resins and pesticides. This problem is not limited to one fuel supplier and it is difficult to identify the definitive source. However, the contamination has been linked to the use of fuel oil cutter stock, a product added to residual fuels to reduce viscosity.

It is important to note that standard testing of fuel in accordance with ISO 8217 will not identify this contaminant. Additional specialist testing is required to look for this particular characteristic. Vessels bunkering fuel at ports in the US Gulf may wish to consider this additional testing when sending the fuel samples to their chosen laboratory. Engineers should pay particular attention to the fuel system and engines when using these fuels and take early action if problems such as fuel pump seizures or filter clogging are noted.

For further information, Veritas Petroleum Services (VPS) have released the following bulletin.

The USCG safety alert can be read here.