Folks keep dinghy gas aboard the Mother-Ship? We keep ours well secured in the dinghy. Eliminates a lot of worry and smell and mess and...and
David F. Risch 1981 40-2 (401) 419-4650 (cell) To: [email protected] Date: Tue, 29 Dec 2015 17:09:52 -0500 Subject: Re: Stus-List Proper Blower Installation - 30 mki NOWFUEL CHARACTERISTICS From: [email protected] CC: [email protected] since no one else has brought it up.... what about all the other things we have on our boats that potentially dangerous. Like the gas tank for the dinghy, the propane for the stove, the odd can of mineral spirits or the admirals hairspray? We are surrounded by everyday things that could go boom! Every boat needs a blower that is properly installed and used! James Delaney C&C 38 Mk11 Oriental, NC From: Della Barba, Joe via CnC-List Sent: Tuesday, December 29, 2015 2:11 PM To: mailto:[email protected] Cc: Della Barba, Joe Subject: Re: Stus-List Proper Blower Installation - 30 mki NOWFUEL CHARACTERISTICS The typical diesel fire scenario is a high pressure fuel leak spraying on a red hot exhaust or turbo component. Joe Coquina From: CnC-List [mailto:[email protected]] On Behalf Of dwight veinot via CnC-List Sent: Tuesday, December 29, 2015 1:12 PM To: [email protected] Cc: dwight veinot Subject: Re: Stus-List Proper Blower Installation - 30 mki NOW FUEL CHARACTERISTICS Rick Nothing about that sounds like a geek to me, just some very good information based on sound knowledge, especially this part: Lots of smell – which may make a blower to ventilate the engine spaces very desirable Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS [email protected] On Tue, Dec 29, 2015 at 1:56 PM, Rick Brass via CnC-List <[email protected]> wrote: The geek in me just has to jump in here with some technical information. So here goes: Yes, Rick, vaporized diesel will blow up like vaporized gasoline. And Yes, Patrick, diesel does not vaporize easily. And is a lot less likely to support a flame than Gasoline as well. The flash point (lowest temperature at which a liquid starts to evaporate) of Gasoline is -45 to -50 degrees F (-60 C, I think). The flash point of #2 diesel is 126 F (52 C). Biodiesel, BTW, is about 225 F so if you use B10 or B15 in your boat the flash point of the fuel would be higher. The ignition concentration of a fuel vapor is the percent of fuel vs air that will support ignition. Too low a concentration or too high a concentration and you get no fire. That is why (if you are very lucky and not too bright, you can throw a lit match into a bowl of gasoline and nothing happens. For gasoline the range is 1.4% to 7.6%. Diesel is pretty similar at 0.6% to 7.5%. The ignition point (temperature at which it will start burning) of gas and diesel are also very similar. Gas is 475 F, and diesel is 494 F. But gasoline is much more volatile, and at much lower temperatures. So you are likely to find gasoline vapor vs. diesel vapor. Any fuel leak at above -45 F will result in gasoline vapor. A diesel leak will just make a puddle unless the temperature is above 126 F. Yes, it would be a smelly puddle, but your nose can sense vapor concentrations far below the concentration that would support ignition. Since the density of the gasoline vapor is about 2.0 (air is by definition 1.0) at standard temperature and pressure (70 F and sea level), the combustible vapor sinks to the bottom of your bilge. Diesel vapor would do the same thing, except a measurable concentration of diesel vapor could not exist at STP. Even high pressure diesel forced out of a pinhole leak in one of your injector lines is more likely to result in a smelly mist (too high a concentration to support ignition) than in a combustible fuel vapor. The flash point indicates when a liquid starts to evaporate. But there is another specification called the fire point that is probably a better illustration of the relative risk from gasoline vs. diesel. The fire point is the temperature at which a liquid fuel will generate a vapor concentration high enough to support a flame for 5 seconds – which is enough time to cause significant evaporation of the liquid and start a real fire (as opposed to a momentary flash). Liquid gasoline has a fire point of 30 F (-1 C), while liquid diesel is 154 F (68 C). So unless you are boating in some really ridiculous heat, you are unlikely to get a fire from diesel fuel. Lots of smell – which may make a blower to ventilate the engine spaces very desirable – but a fire is not a high probablility event. Rick Brass Washington, NC From: CnC-List [mailto:[email protected]] On Behalf Of Patrick Davin via CnC-List Sent: Monday, December 28, 2015 10:43 AM To: [email protected] Cc: Patrick Davin <[email protected]> Subject: Re: Stus-List Proper Blower Installation - 30 mki Diesel doesn't vaporize easily, unlike gasoline. That's one of its big advantages on boats, that it's non-volatile. It's good practice to shut down the engine at the fuel dock anyway, but they're probably asking that more as a general policy due to the gasoline boats they fill (or in case some gasoline vapors wafted over to your boat). The flash point (vaporization temp) of diesel is 126 F: https://en.wikipedia.org/wiki/Flash_point#Examples There's a good writeup on engine blowers here: http://www.unitedmarine.net/blog/index.php/2013/01/30/who-needs-engine-room-blowers/ On Mon, Dec 28, 2015 at 6:09 AM, <[email protected]> wrote: ---------- Forwarded message ---------- From: Rick Rohwer <[email protected]> To: [email protected] Cc: Date: Sun, 27 Dec 2015 22:16:22 -0800 Subject: Re: Stus-List Proper Blower Installation - 30 mki I am pretty sure vaporized diesel will blow up like gasoline vapor. I know vaporized cooking fat will. Don’t most of the fuel docks ask you to shut down the engine and run the fan while fueling? I had never thought of it as an air supply for the engine. Rick Paikea 37+ Poulsbo, WA _______________________________________________ Email address: [email protected] To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ Email address: [email protected] To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ Email address: [email protected] To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com This email has been sent from a virus-free computer protected by Avast. www.avast.com
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