The company currently runs nine hydraulic breakers, a Rip Rap Plant, Powerscreen and several Scalpers. Each breaker handles duties at different locations. Two HB 2200 models, both mounted on Cat 325 excavators, are stationed at quarries near Dallas and Austin. An MB 1200 works in a quarry north of San Antonio, and an MB 800 produces concrete riprap at ready-mix yards in the Houston area. The MB 1200 is being used exclusively on limestone. And since concrete is easier to break than the natural stone riprap, we use the smallest unit for our concrete riprap product. The Lippmann 6224 Rip Rap Plant & the Chieftain Power Screen are used to produce most of the smaller rip rap and armor stone.
(62.37lbs) to the actual weight of the stone.
foot/62.37 = SG
SG = = ρ / ρH2O (3) where
SG= specific gravity
ρ= density of fluid or substance (lb/ft3)
ρH2O = density of water (lb/ft3)
It is common to use the density of water at 4 oC (39oF) as reference – at this point the density of water is at the highest – 1000kg/m3 or 62.4 lb/ft3.