Scribd
Upload
341 views5 pages

7 OSM Airblast Calculator

This document contains information about three airblast estimation tools: the Airblast Estimator, Airblast Extrapolator, and Airblast Plotter. The Airblast Estimator allows users to calculate scaled distance (SD3), pressure (PSI), and decibels (dB) given charge weight and distance. The Airblast Extrapolator allows extrapolating PSI and dB to a second distance given an initial airblast measurement and distances. The Airblast Plotter allows plotting multiple airblast measurements on a scaled distance graph.

Uploaded by

xiaotaoscribd
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
341 views5 pages

7 OSM Airblast Calculator

This document contains information about three airblast estimation tools: the Airblast Estimator, Airblast Extrapolator, and Airblast Plotter. The Airblast Estimator allows users to calculate scaled distance (SD3), pressure (PSI), and decibels (dB) given charge weight and distance. The Airblast Extrapolator allows extrapolating PSI and dB to a second distance given an initial airblast measurement and distances. The Airblast Plotter allows plotting multiple airblast measurements on a scaled distance graph.

Uploaded by

xiaotaoscribd
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
You are on page 1/ 5

Airblast Estimator

For use when no airblast data are available. Enter CW/Delay (pounds of explosives) and Distance (distance to point of concern) to solve for SD3 (cube root scaled distance), psi (pounds square inch) and dBL (decibels linear) Distance Unconfined Line 1 10000 1000 CW/Delay SD3 PSI P/Po dB Open air detonation (Perkins, Jackson,1964) Demolition and detcord

1 1 1

1 10000 1000

187 ### 0 194734.82 0.01 ###

216.2 105.8 133.4

Parting Line 1 10000 1000 1 1 1 1 10000 1000 169 ### 0 18771.06 0 787931.94 215.3 85.5 117.9 Coal mine parting (USBM RI 8485) Coal or Quarry Average

Highwall Line 1 10000 1000

1 1 1

1 10000 1000

0.16 ### 0 37249.21 0 231801.91

154.9 91.4 107.3

Coal mine highwall (USBM RI 8485) Coal or quarry expected

Legend Distance - Distance to recording (ft) CW/Delay - Charge weight per Delay (lbs) SD3 - Cubed Root Scaled Distance (ft/lb1/3) PSI - Pressure, pounds per square inch dB - Pressure, decibels

PSI Conversion to Decibels 1000 344827586206.9 0 34482.76 0.01 1 3448275.86 344827586.21

230.8 90.8 130.8 170.8

Airblast Estimator
10 1 0.1 0.01 0 0 10 100 1000 Cubed Root Scaled Distance (ft/lb1/3)
Column D Column F Column F Column F

191 181 171 161 141 131 121 111 101 91 10000
Decibels (dB)

Air Overpressure (PSI)

151

Airblast Extrapolator
For use only when there is a airblast measurement available in the same direction as the point of concern. Enter AB 1 (the airblast level measured-in dBL) to get PSI 1 (psi of AB 1). Enter DIST 1 (distance to the location of the airblast measurement) and DIST 2 (distance to point of concern) to extrapolate PSI 2 (psi) and AB 2 (dB) at point of concern. AB 1 140 PSI 1 0.03 DIST 1 1200 DIST 2 3000 PSI 2 0.01 AB 2 129.03 Open air detonation (Perkins, Jackson,1964) Demolition and detcord

AB 1 120

PSI 1 0

DIST 1 2000

DIST 2 3000

PSI 2 0

AB 2 114.3

Coal mine parting (USBM RI 8485) Coal or Quarry Average

AB 1 120

PSI 1 0

DIST 1 500

DIST 2 700

PSI 2 0

AB 2 117.69

Coal mine highwall (USBM RI 8485) Coal or quarry expected

Airblast Plotter
For use when many airblast measurements are available. Distance CW/Delay SD3 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! dB Legend Distance - Distance to recording (ft) CW/Delay - Charge weight per Delay (lbs) SD3 - Cubed Root Scaled Distance (ft/lb1/3) dB - Pressure, decibels

#DIV/0!

Airblast Plotter
10 1 Air Overpressure (PSI) 0.1 0.01 0 0 10 100 1000 Cubed Root Scaled Distance (ft/lb1/3)
Column Column Column Column Column D F F F D

191 181 171 161 141 131 121 111 101 91 10000
Decibels (dB)

151

You might also like