Mariner 2.5 2 stroke fuel consumption.

[Stemar]

My Tohatsu used a 50:1 mix. Using the OB to get to and from the mooring plus jaunts at anchor, a litre of oil lasted for several years so, even with my green hat on, I wasn't overly concerned about using it at sea. In a small, enclosed lake, I could see how a lot of 2T OBs could be a problem, but there are plenty of bugs around that eat oil.

IIRC they looked at area the Torrey Canyon messed up so comprehensively 20 years later and there was no sign anything had ever happened. How many hours of small OB use - even Seagulls - does it take to make as much of a mess as one tanker doing an illegal tank clean at sea - a daily occurrence?

 

[Refueler]

My Tohatsu used a 50:1 mix. Using the OB to get to and from the mooring plus jaunts at anchor, a litre of oil lasted for several years so, even with my green hat on, I wasn't overly concerned about using it at sea. In a small, enclosed lake, I could see how a lot of 2T OBs could be a problem, but there are plenty of bugs around that eat oil.

IIRC they looked at area the Torrey Canyon messed up so comprehensively 20 years later and there was no sign anything had ever happened. How many hours of small OB use - even Seagulls - does it take to make as much of a mess as one tanker doing an illegal tank clean at sea - a daily occurrence?

Its not so easy to get away with a tank clean discharge at sea now ... as the records and inspections of vessels before loading etc. are now strict on what is on board as residues from cleaning.

Years ago - some used to clean - then dump the volume out at deep sea ... back fill slop tank with water to level expected. Totally illegal.

Prior to that - it was normal practice to gauge the oil-water interface after oil had settled out. The lower volume being water would then be pumped overboard - stopping before reaching the interface. That practice became 'outlawed' and Crude Oil washing became the norm.

During discharge now - the oil is used as cleaning medium by spraying round the tanks .. this reduces residues in the tanks and gets all pumped ashore as part of the discharge.

The days of intentional discharge at sea are long gone ...

 

[Beneteau381]

My Tohatsu used a 50:1 mix. Using the OB to get to and from the mooring plus jaunts at anchor, a litre of oil lasted for several years so, even with my green hat on, I wasn't overly concerned about using it at sea. In a small, enclosed lake, I could see how a lot of 2T OBs could be a problem, but there are plenty of bugs around that eat oil.

IIRC they looked at area the Torrey Canyon messed up so comprehensively 20 years later and there was no sign anything had ever happened. How many hours of small OB use - even Seagulls - does it take to make as much of a mess as one tanker doing an illegal tank clean at sea - a daily occurrence?

Indeed ref Torrey Canyon. People forget oil is made from organic material. Nature has its own bugs for eating oil. Its only the mechanical effects of smothering for example, that is the big deal. The aromatics of crude percentage wise are not that big either, hence the use of "crackers" to refine it out. Crude oil spills like the Torrey Canyon, in the grand scheme of things, as you have quite rightly pointed out are not a biggie.

 

[Refueler]

Indeed ref Torrey Canyon. People forget oil is made from organic material. Nature has its own bugs for eating oil. Its only the mechanical effects of smothering for example, that is the big deal. The aromatics of crude percentage wise are not that big either, hence the use of "crackers" to refine it out. Crude oil spills like the Torrey Canyon, in the grand scheme of things, as you have quite rightly pointed out are not a biggie.

Under the oceans ... there are 'oil spills' occurring 24 hrs a day ... 7 days a week ... from fissures in the sea bed ... some have been quantified to make our contributions look like tiniest drop in mighty ocean ...

But it still does not excuse the actions of man.