Circular prestressed concrete tanks have been in various stages of development and renovation for decades. Early systems used in the United States called for the employment of cast-in-place concrete in the core wall of the tank and steel rods with turnbuckles as the prestressing elements. Although, theoretically, this approach to circumferentially prestressed concrete tanks was sound, deficiencies in the placement of the concrete, together with insufficient residual compression in the core wall, brought about modifications and upgrades.
In the early 1930s, the matter was fully understood when J.M. Crom, Sr. began the development of what was later to become the composite system of tank wall construction. This system incorporated a steel shell cylinder with shotcrete encasement for the core wall and high strength wire for the prestressing elements.
Over the years, Mr. Crom’s successors have improved and perfected the composite system for tank wall construction. These improvements have included the selection of better construction materials, as well as ever-improving design and construction procedures. Consideration was given to:
The development of the prestressed composite system emerged from these considerations as the most effective and enduring approach to circular prestressed concrete tanks. The composite system includes such proven tank engineering truths as:
In the early 1950s, J.M. Crom, Sr., and three associates, Ted Crom, Jack Crom, Jr., and Frank Bertie, established CROM, with headquarters in Gainesville, Florida. The prime purpose of the company was to refine the design and construction techniques of composite tanks. Since then, the subsequent leadership and employees of CROM have continued the tradition of excellence initiated by the company’s founders. To date, the company has constructed, in its own name and with its own forces, over 4,300 circular and elongated prestressed concrete tanks.