Originally Posted By: L. Brown
He converted the old LUP figure (which was 650 bars service pressure) to the psi equivalent.


http://www.onlineconversion.com/pressure.htm
650 Bars = 4.21 (Long Tons / Square inch)

http://www.doublegunshop.com/forums/ubbt...age=4#Post61404
Scroll down to 2-Pipers's post.

Originally Posted By: 2-piper
Note that in sir Gerald Burrard's work "The Modern Shotgun" Appendix III was a work on "The Piezoelectric Pressure Gauge and it's Application to the Measurement of Pressure in Shotguns" by A Watson, B.Sc., F.Inst.P. In this work he discusses the mounting of a piezoelectric (P) gauge & a lead crusher (L) gauge on opposite sides of a pressure bbl, both @ exactly 1.0" from breech giving simultaneous readings of the same shot. After a careful study of these readings the following was stated; "Over the range of pressures usually encountered at the one inch position in shotguns the reaings given by the two gauges are related by the equation;

P=1.5L(tons)-.5tons"



So, using "P=1.5L(tons)-.5tons"

4.21 LUP (Long Tons/Square Inch) = 5.815 Piezo (Long Tons/Square Inch)

Using 2240 pounds per long ton:


5.815 Piezo (Long Tons/Square In Foot) = 13,026 Piezo PSI

I went wrong somewhere. Perhaps 2-piper will pipe in and tell me where I went wrong.




Last edited by AmarilloMike; 08/06/13 08:37 AM.

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