ASSEMBLE SEAL DISC AND MOUNTING BOLTS
Place seal-disc quarter section on hub, aligning the pear-shaped opening over one of the eye-bolts (See Figure 6) and drop the seal-disc quarter section onto the nearest group of seal-disc bracket stud pairs. Remove adhesive backing on nitrile gasket section and apply gasket to seal-disc flange surface carefully such that holes in gasket lineup with the holes in the flange (See Figure 7). Repeat these operations with the next three seal-disc quarter sections, ensuring that seal-disc balance match-marks
are aligned.
Figure 5
Figure 6
Figure 7
Make final adjustments to the quarter sections such they mate properly with each other and all seal-disc bracket studs, install the fasteners loosely joining each seal-disc section using one flat washer against the fiberglass surface on each side, one 3/8” hex bolt, lock washer, and hex nut at each flange hole location (See Figure 8). Ensure final fit-up of the seal-disc sections, check flatness and alignment of pear-shape openings with the eye-bolts, and snug all fasteners. Complete fasteners at each bracket location (two per bracket) using a 3/8” hex bolt, flat washer, lock washer, and hex nut
(See Figure 9). Snug these fasteners.
Figure 8
Using a measuring tape in several radial locations, double-check the seal-disc assembly such that it is centrally located on the hub. Make any final adjustments as necessary to ensure concentricity and trueness then tighten all fasteners at the flange surfaces and bracket studs to 15 ft-lbs lubricated or 20 ft-lbs non-lubricated. Make sure that all other details of fan installation is complete and be sure to remove all tools, loose parts, and materials from the
completed hub assembly prior to startup.
