Stephen Bird
Computer
- Jul 27, 2023
- 1
thread507-493391
As mentioned in the previous thread, the Kingery Bulmash coefficients in the IATG (International Ammunition Technical Guide) available on the UN Saferguard website appear to be incomplete and incorrect. The Kingery Bulmash paper is not available to the general public.
It happens that the coefficients are also given in Lees Loss Prevention in the Process Industries. It is possible that Lees is correct, or that both Lees and IATG are wrong. The differences are as follows:
IATA is missing C9, C10, and C11. These are included in Lees.
IATA and Lees disagree on the sign of C1, C2, and C4.
That's it.
These coefficients are for incident pressure from a surface explosion.
Note that one can use the Simplified Kingery equations and coefficients instead. The corresponding paper by Swisdak is available to the public. Swisdak covers surface explosions only, but the coefficients are correct.
It is fairly easy to write a computer program for the Kingery Bulmash or Simplified Kingery curves, given the correct coefficients.
Of course we would all like to know the coefficients for free air explosions, and for the other explosion properties (reflected pressure, etc.) are correct, in IATG or Lees.
Thanks.
As mentioned in the previous thread, the Kingery Bulmash coefficients in the IATG (International Ammunition Technical Guide) available on the UN Saferguard website appear to be incomplete and incorrect. The Kingery Bulmash paper is not available to the general public.
It happens that the coefficients are also given in Lees Loss Prevention in the Process Industries. It is possible that Lees is correct, or that both Lees and IATG are wrong. The differences are as follows:
IATA is missing C9, C10, and C11. These are included in Lees.
IATA and Lees disagree on the sign of C1, C2, and C4.
That's it.
These coefficients are for incident pressure from a surface explosion.
Note that one can use the Simplified Kingery equations and coefficients instead. The corresponding paper by Swisdak is available to the public. Swisdak covers surface explosions only, but the coefficients are correct.
It is fairly easy to write a computer program for the Kingery Bulmash or Simplified Kingery curves, given the correct coefficients.
Of course we would all like to know the coefficients for free air explosions, and for the other explosion properties (reflected pressure, etc.) are correct, in IATG or Lees.
Thanks.
