Reply
 
Thread Tools Search this Thread
 
Old 25 August 2005, 09:32   #11
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Quote:
Originally Posted by ashbypower
I Think you'll find that the flash point of petrol is <45 Deg C and for Diesel it is <62 deg C

Regards

Brian
... However hot exhausts will not, from my understanding, cause a fire directly. The vapours will still need a source of ignition.. usually electrical.
__________________

__________________
Jono is offline   Reply With Quote
Old 25 August 2005, 10:25   #12
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Quote:
Originally Posted by ashbypower
I Think you'll find that the flash point of petrol is <45 Deg C and for Diesel it is <62 deg C

Regards

Brian
Yes but the self ignition point is close to 600 C where as diesel is around 300 C

at the flash point a fuel with continue to burn without a source of ignition but it will not start to burn on its own

Interestingly (If you find this sort of thing interesting) brake fluid is the most dangerous fluid in a car because its self ignition point is only 200 C well within slightly hot exhaust temperatures Des
__________________

__________________
Scary Des is offline   Reply With Quote
Old 25 August 2005, 10:34   #13
Member
 
ashbypower's Avatar
 
Country: UK - England
Town: Salisbury/Poole
Boat name: Blue C
Make: XS 600
Length: 6m +
Engine: 125hp Opti
MMSI: 235082826/235909566
Join Date: Jan 2004
Posts: 1,439
Des, I Think your getting Deg C and Deg F muxed up WoW thats HOT

Petrol Autoignition temperature: 246C Diesel Autoignition temperature: 210C


Yep! I was not going to mention break fluid or some hydrolic fluids.

Regards

Brian
__________________
Brian C
Harbour Sea School & APS Marine Centre
ashbypower is offline   Reply With Quote
Old 25 August 2005, 10:39   #14
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Anoraks at dawn! Now this sort of discussion is more to my liking..... technical subtleties... my favourite!
__________________
Jono is offline   Reply With Quote
Old 25 August 2005, 10:44   #15
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Get the gloves off Jono...

I knew mineral brake fluid had a low flashpoint-I've done a couple of insurance estimates on vehicles that have caught fire after a crash from spilled brake fluid when I worked as a fitters mate years back-but does the 'new' silicone brake fluid do it too? Not come across an accident where it's been spilt yet.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 25 August 2005, 10:45   #16
Member
 
ashbypower's Avatar
 
Country: UK - England
Town: Salisbury/Poole
Boat name: Blue C
Make: XS 600
Length: 6m +
Engine: 125hp Opti
MMSI: 235082826/235909566
Join Date: Jan 2004
Posts: 1,439
Anorak who's an anorak??

Ok Ok I'll get me coat (Anorak)

Regards

Brian

Anyway enough of this It is after all a RIB forum!!
__________________
Brian C
Harbour Sea School & APS Marine Centre
ashbypower is offline   Reply With Quote
Old 25 August 2005, 10:50   #17
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Actually, despite the slight deviation from topic , it's been a worry of mine.... I fill up with loads of lurverly petrol from a quayside fuel pump and know that all those fumes are filling up my nice, bowl shaped RIB....... a recipe for disaster really, if you think about it must re-check my insurance cover!
__________________
Jono is offline   Reply With Quote
Old 25 August 2005, 11:13   #18
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Quote:
Originally Posted by ashbypower
Des, I Think your getting Deg C and Deg F muxed up......Brian
No I was thinking C
The point of self ignition does depend on the octane rating of the fuel and on what additives are in the fuel.

To be fair I should have expressed it as a range of 200 to 600 degree C, (UK fuel closer to 550). However, the point I was making was that with out a source of ignition petrol is safer than diesel and loads safer than brake fluid or hydraulic oil Des
__________________
Scary Des is offline   Reply With Quote
Old 25 August 2005, 13:44   #19
Member
 
ashbypower's Avatar
 
Country: UK - England
Town: Salisbury/Poole
Boat name: Blue C
Make: XS 600
Length: 6m +
Engine: 125hp Opti
MMSI: 235082826/235909566
Join Date: Jan 2004
Posts: 1,439
Des, Totally agree. Not wishing to prolong the discussion off topic, it appears we are on the same wavelength.


Cheers

Brian
__________________
Brian C
Harbour Sea School & APS Marine Centre
ashbypower is offline   Reply With Quote
Old 25 August 2005, 13:49   #20
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by Scary Des
No I was thinking C
The point of self ignition does depend on the octane rating of the fuel and on what additives are in the fuel.

To be fair I should have expressed it as a range of 200 to 600 degree C, (UK fuel closer to 550). However, the point I was making was that with out a source of ignition petrol is safer than diesel and loads safer than brake fluid or hydraulic oil Des

Spot on - lot of people don't relaise that.

Jono is quite right about the match trick - a lighted fag will also be put out by petrol.......

Talking of brake fluid I had direct experience of that - I had just bought my beloved Alfa 75 - 30,000 on the clock and well pleased with it. A few days later I had stopped on a steep hill - narrow country road - suddenly loads of smoke coming from under the bonnet.

I always carry a few bottle of mineral water with me - opened the bonnet and saw things well alight - chucked all the water over the fire and luckily we were right next to a resevoir - mate kept going back for refills.

When the fire was out I saw what had caused it - somehow the brake fluid resevoir had blown off the cylinder - brake fluid right onto the tubular exhaust manifold. How it happened I will never know - the breather hole was clear!!!

I was very lucky - the ONLY damage was a tiny bit of insulation burnt through on one wire - bit of tape around that and the car did another 140,000 miles no probs at all - still have it!!!
__________________

__________________
codprawn is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 20:17.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.