857.1 General Description
This section includes the requirements for the following: • Bronze bearings and expansion plates • Bronze bushings • Self-lubricating bronze bearings, expansion plates, and bushings
857.1.01 Related References
A. Standard Specifications General Provisions 101 through 150. B. Referenced Documents ANSI B 46.1 ASTM B 22, Alloy UNS91100 ASTM B 100, Alloy UNS 51000 ASTM B 584 Alloy UNS C86200
857.2 Materials
857.2.01 Bronze Bearings and Expansion Plates
A. Requirements Type Use bearings and expansion plates that meet the following requirements: a. Cast Bronze: ASTM B 22, Alloy UNS91100. b. Rolled Bronze: ASTM B 100, Alloy UNS 51000. Certification Furnish certification to the Engineer showing physical and chemical properties of the material and conformance to these specifications. B. Fabrication Finish contact surfaces of plates in the direction of motion specified by ANSI B 46.1, No. 125 (No. 3.2 µm). C. Acceptance The Department will accept the material based on the certifications. D. Materials Warranty General Provisions 101 through 150.
857.2.02 Bronze Bushings
A. Requirements Type Use bronze bushings that meet ASTM B 584, Alloy UNS C86200 requirements. Certification Furnish a certification to the Engineer showing physical and chemical properties of the material and conformance to these specifications. B. Fabrication Finish contact surfaces of bushings in the direction of motion specified by ANSI B 46.1, Nos. 63 to 125 (1.6 to 3.2 µm). C. Acceptance The Department will accept the material based on the certifications. D. Materials Warranty General Provisions 101 through 150.
857.2.03 Self-lubricating Bronze Bearings, Expansion Plates, and Bushings
A. Requirements Type Use self-lubricating bronze bearings, expansion plates, and bushings that meet Subsection 857.2.01 or
857.2 02.
a. Ensure that the surfaces of self-lubricating bronze bearings, expansion plates, and bushings are bored in a geometric, recessed pattern. Use a lubricating material in the bearing areas that has a long service life. b. Lubricate approximately 25 percent of the bearing face. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the material based on the certifications. D. Materials Warranty General Provisions 101 through 150.
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