1. Proper BB clearance is to be determined and maintained by the Engineering section. (Maximum clearance between rotor tips and liner not to exceed 3/4 inch on No.9,11,S268, F270, F370 and No.27 BBs). 2. New ram weights must have 1/4 inch clearance between each face and the BB throat for (125L, No.9,11, S268, F270 and No. 27 units. This clearance is 3/16 inch for F370 BBs.It is also important that the intersection between the ram weights vertical face and sloping bottom face be at least 3/4 inch above the intersection between the BB throat and mixing chamber when the ram is fully down. For those BBs (125L, No.9,11,S268, F270, No. 27, and all F370 BBs) operating at high pressure (greater than 45 PSI ESP or size 27 BBs with safety stops), this distance should be increased to 1-1/2 inches. 3. Dust rings must be replaced whenever there is evidence of breakage or excessive leakage. Wear rings must be bronze and the floating rings stellite. 4. Cooling pipes and sprays must be checked daily and kept completely open on supply side during normal operation. 5. BB floating weight piston rod connection and piston rod gland assembly should be lubricated once each shift if the ram weight gasket is not installed. 6. Banbury throat, ram, and associated ram parts shall be kept clean and free from buildups at all times. 7. All tailings, loose pigments, etc., shall be removed from around the discharge door at frequent and regular intervals and placed in a proper container.