Skeeterbd;
I am not so certain that 3 tons & 740 Bar are equal. back while the Tons system was still in use Burrard reported that simultaneous pressure tests had been run using both lead crushers & Piezo Electric transducers & a fromua worked out which within the range of shotgun pressures "Only" would be very close. Close enough in fact to avoid trouble from its use. The formula was Crusher Tons times 1˝ minus 1/2 ton = Transducer Tons. Thus 3 x 1.5 = 4.5; 4.5 - .5 = 4. As the Ton here is the 2240 lb long ton then 4 x 2240 = 8,960 PSI. Using the same formula 3Ľ Tons = 9,800 PSI, 3˝ tons =10,640 & 4 tons = 12,320 PSI.
From what knowledge I have of the subject these do indeed seem to be very close conversions. It is of course true that crusher pressures do not translate directly to transducer PSI. "IF" they did then 3 Tons would =6,720 PSSI & 3˝ Tons would = 7,840. It is also obvious that the act of adding 1,000 lbs to the crusher reading is not going to be close either. Both of these are more than 2,000 lbs off the crusher reading.
