... ,P50*30,P60*40,P80*50,P110*50 Multi-tier Rack Racking Shelf Shelves:Its standard is ormally the same as long ... uniform distributed beam load is from 100 to 500kg per shelf,the floor loading is 500kg /m2 U.D.L.we ... raise floor is developed to increase the pick height the shelf system can be built to 1+1 2tiers or above ...