- Myth of restriction of Barometer Pressure Correction formula in Flash Point test methods

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- Myth of restriction of Barometer Pressure Correction formula in Flash Point test methods

The flash point test methods practiced in India as per BIS 1448- P:20,  etc places restriction of following Barometer Correction Formula

               Corrected Flash Point = C + 0.25 ( 101.3 - P)
                   
           where  C = Observed Flash Point in deg C
                      P  = Observed Barometer reading,  kPa

The current BIS test method P : 20, Determination of Flash Point by Abel Apparatus 1998 reaffirmed July 2013 states on page no. 7:
                
               This   correction  is   applicable  over  the   range 98 to 105 kPa


NOTE This equation is strictly correct only within the barometric pressure range from 98,0 kPa to 104,7 kPa.   

 The same above restriction is also seen  on  Joint test  Abel  Flash Point IP 170/09,    ISO 13736,  on page 170.5.10,  Joint test Pensky & Martin Flash Point method IP 34, ISO 2719 and Joint Cleveland Flash Point IP 36,  ISO 2592 as shown below:

Despite the restriction of Barometer pressure from 98 to 105 kPa,  the above formula was when applied to much lower pressure even upto 51 kPa,  the correction gives value almost matching for all 12 high altitude locations flash point carried out as given in last blog,   This higher altitude flash point study was done in 1999-2001 period.  Thus the restriction of limits in barometer pressure readings do not hold good.

Bureau of Indian Standards, New Delhi need to update the test methods removing the restriction of Barometer Pressure limits. 

Energy Institute, UK,  ISO , ASTM may like to take a note of above.

So now accepting that at higher altitude,  the standard pressure correction formula holds,  what is the Flash Point of a Kerosene sample having FP= 38 Deg C at sea Level  when tested on: 

a)   Mt Everest Summit ?       b) Moon

Hope you will enjoy answers to above in coming blog shortly.


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Comments

Romanova said…
For knowing Flash Point on Everest and Moon, one needs to know the exact barometer pressure there. Fortin Barometer will not work at that height. Okay accepting, the correction formula of IP-170 will work beyond the restriction pressure range, how to calculate without knowing air pressure there ?
18/01/2017, 03:41
Hanif said…
On Everest,air pressure is 239 mmHg.
19/01/2017, 00:12
R J Patel said…
The first Direct measurement of air pressure on summit of Everest was done in Oct 1981 and reported as 253 mm. This is the air pressure value and Oxygen content in air based on 253 mm air pressure value is still used for calculation by mountaineers when they approach Summit of Mt Everest.
20/01/2017, 04:38
R J Patel said…
Interesting information - Did you know that if Mt. Everest were located in Alaska or Siberia, it is said that no one would have been able to reach the summit breathing natural air.

As the air gets warmer, the molecules in it spread out and make the atmosphere deeper.

Whats-more, the way the earth rotates means there is less air over the poles to begin with, and more air is concentrated around equator generally and specific at altitude, explains why the air has relatively more oxygen at altitude at the Everest location which is nearby equator.
20/01/2017, 04:46
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