Monday, Dec 22, 2008 at 01:59
Just posting another response to the many queries and follow-ups posted since my earlier reply. All of you follow-ups are correct, and I applaud your knowledge of the industry. I'll just add a bit more detail, or in some cases more recent info. In no particular order:
Water in tanks- the big tanks at Refineries and at terminals are strictly controlled- the refinery tanks in fact have water bottoms in them (for stock control/working capital reasons), but the level of the water is known and controlled. They use water finding paste on a dip tape to measure the water level. The draw off nozzles are always
well above the water level. If it wasn't, then a whole City full of servos would have a problem at once, not just the one servo. The old bushman's remedy is useful to know- add a bottle of metho to a tank if you have or suspect a water problem. Metho dissolves up the water and carries it safely through your fuel system and engine. Just digressing a bit- metho is in fact largely ethanol (which you can drink) which has been denatured (or made poisonous) by adding methanol. You will get severe brain damage if you drink it.
E10 unleaded is 10% ethanol, so should do this trick on it's own. It can't be stored in a water bottoms tank though, or the ethanol would soak up all the water. E10 is blended in terminal tanks.
Woolworths (and Coles)- both formed alliances several years ago, so that they could each have access to enough of the higher spec fuels which came in (petrol and diesel) in January 2007. Previously, they imported most of their fuel (or purchased from local refiners). Woolworths-
Caltex, Coles- Shell. It was a close arrangement/marriage, with Woolies/Coles in many cases rebranding Caltex/Shell servos, and the Shell/
Caltex convenience store arms in some cases becoming Coles/Woolies branded. Industry wisdom said that the Woolies/Coles shopper dockets would take over the market (which it has), so
Caltex and Shell have been "winners" while BP and
Mobil lost out. The volumes that
Caltex and Shell sell are certainly higher due to these arrangements.
Special fuels- when a company introduces a "special" fuel, they have a problem logistically getting it all around the country. They have two possible methods. The easiest is to add a special additive at the terminal. They still buy the bulk fuel from the local refinery, then add magic ingredient X at the terminal. They need to do something if they are to legally claim a difference. These additives can range from higher detergent levels (cleans your fuel injectors), to E10 mentioned above, where the 10% ethanol is blended at the terminal. If they are selling an innately different product (eg. lower sulphur diesel, or higher octane petrol), then that has to come from a refinery. If you are the only mob making it, then you have to ship it to wherever you want to sell it. If the others make it, then you can buy it from them (if they will sell it to you). The early Shell Ultra High premium unleaded in the mid 90's was despatched originally from
Sydney only, where they were blending in toluene purchased from overseas chemical plants to get the high octane. It must have cost them a fortune.
Clean diesel- Prior to January 2007, Australian spec diesel was 500 parts per million (ppm) sulphur. In Jan 2007, the spec dropped to 50 ppm sulphur with a further drop to 10 ppm due in a couple of years time (I can't recall the exact date). Those who installed the big expensive upgrades (BP,
Caltex) designed them for 10 ppm diesel, while those who "did it on the cheap" (
Mobil) aimed for the 50ppm. In
Mobil's case, they shut down
Adelaide Refinery and reduced the capacity of the
Melbourne refinery by 40% to meet this at lower capital cost. Not sure what
Mobil is planning to do when the 10ppm becomes compulsory.
There was a slight excise incentive for refiners who sell 10ppm diesel ahead of the mandatory date, so BP and
Caltex went for it.
Caltex is commissioning the final bit of their diesel refining capacity early next year, so will be able to make a lot more 10ppm diesel from then. In terms of what it means to your engine, I don't believe that the lower sulphur (below 50ppm) will in fact benefit your engine. The reduction in sulphur is to reduce pollution, not to make your diesel run better. Watch the advertising- it talks about cleaner and better for the environment. Sulphur is in fact a useful lubricant (like lead was in leaded petrol), so it could be argued that lower sulphur diesel is less lubricating. The comments about BP diesel hark back at least 20 years to a time when BP in Queensland was hydrotreating their diesel (the current and best treatment) while
Ampol at the time weren't. In a short space of time, the
Ampol stuff darkened and formed gums which clogged up injectors and filters. The
Ampol stuff was always cheaper though...
Today, I don't believe that any diesel sold that meets the current spec is better or worse than any other.
Kevin J- that episode that you mentioned was where there were large sales of heating oil (which has no excise) into Queensland (where no one uses oil to heat their
home). When combined with real diesel, it would have been fine to run your car on.They were getting it excise-free, then selling it at a handsome profit, and a discount. Everyone (except the Government) was winning on that one.
One final comment- do you recall when BP diesel caused all those diesel pump leaks a few years back? This came about because BP removed an impurity from their diesel. They paid out a lot of money in damages claims because they sold cleaner diesel. All the earlier diesel had a certain concentration of aromatic compounds (a strong solvent). Gaskets and seals in fuel pumps etc. which were not resistant to the aromatics would swell up (like rubber in petrol) when they contacted the aromatics. If those vehicles then changed over to BP diesel, then the lack of aromatics caused the seals to shrink and leak. Vehicles with aromatic-resistant seals, or seals which never saw the aromatics in the first place were fine.
Merry Christmas everyone.
AnswerID:
340838
Follow Up By: Saharaman (aka Geepeem) - Monday, Dec 22, 2008 at 07:26
Monday, Dec 22, 2008 at 07:26
Len, thanks for the excellent info provided.
I just want to clarify one point you mentioned - about putting metho in to absorb water. Does that apply to petrol and diesel or just petrol. If not diesel is there a bushmans remedy for diesel as
well.
Cheers GPM
FollowupID:
608485
Follow Up By: Member - Captain (WA) - Monday, Dec 22, 2008 at 08:57
Monday, Dec 22, 2008 at 08:57
Lenticular, the BP refinery at Kwinana has 2 lines. One is for their Ultimate product which has the <10ppm sulphur and it also has a higher cetane rating (similar to octane for petrol - for others who are unaware). While most diesel in WA does come from the BP refinery, only some BP locations get the Ultimate fuel. It is easily distinguished as it doesn't have the familiar diesel odour and has virtually no foaming. I believe it is worthwhile using the Ultimate diesel over the regular stuff, a bit like Premium unleaded over standard.
Cheers
Captain
FollowupID:
608495
Follow Up By: Lenticular - Tuesday, Dec 23, 2008 at 07:32
Tuesday, Dec 23, 2008 at 07:32
Captain, Many thanks for that good information. Yes, 10ppm diesel is treated as a marketing edge (and it costs more to refine), so they do dole it out carefully. If another company wanted to buy the 10ppm, they would pay more for it (and hopefully would market it as being clean and green to get the same marketing advantage). Very interested to hear that it has a different smell. I was also unaware that it had a higher cetane content.
I followed your exploits with the Windsor Rapid at around the time that I bought
mine (3 years ago). The only offroad that I do however is towing it along
the beach at Fraser Is every
Easter.
Higher cetane is an advantage, although like octane, high enough(for your engine) is good enough. Modern petrol engines use their knock sensors to
check the octane from time to time and get more horsepower if they are running higher octane (my Aurion is supposed to get 200kw on 92 unleaded and 204 kw on premium unleaded). I have no idea whether diesel engines do the same with extra cetane. Perhaps someone from the car industry would also know ?
Saharaman,
Sorry, but I am not a diesel engine expert. However, based on my knowledge of the fuels, here is a guess: The metho would also dissolve up the water, and itself should dissolve up OK in the diesel. A bottle of metho shouldn't muck up the diesel properties in a full tank of fuel either. What happens in the diesel pump and injectors however I have no idea. Getting it wrong here could be very expensive. Perhaps a diesel engine expert (anyone here ?)might know ?
FollowupID:
608652