The spin-1 Blume-Capel model with a special random crystal field was studied in the Pair Approximation based on Bogoliubov inequality for the free energy. The global phase diagram in the reduced temperature as a function of reduced anisotropy plane for the whole range of concentration was obtained. Special interest is given in the low temperature region of the phase diagrams where a number of first-order lines emerge from a multiphase point at the ground state. The results for the two- and three-dimensional models are qualitatively the same and, as the two-dimensional model is more studied in the literature, we will just discuss below the phase diagrams for the square lattice z = 4. A lower critical concentration (p?), above which there is no more a stable ferromagnetic phase at low temperatures for arbitrarily large values of the crystal field, is achieved from the present approach. There are three different intervals for the probability concentration of crystal field. The first interval is p ? < p < 1 where p ? is approximated to 0.93, the phase diagram presents a tricritical point, two different ordered phases at low temperatures, and is similar to that of the pure model. The second interval is p ? < p < p ? with p ? = (z i 2)=(z i 1), where the reentrance and the tricritical point are disappeared. And finally, for p < p? where there is an asymmetric second-order transition line extending infinitely for d ! 1 and two distinct ferromagnetic phases at low temperatures separated by a first-order transition line ending at an isolated multiphase critical point.