This Specification outlines the requirements to furnish and deliver to Pittsburgh Regional Transit (PRT) two (2) pre-stretched Wire Ropes, 1¼ in. diameter, Dyform 6 x 36 WS, Independent Wire Rope Core (IWRC), right regular lay, or “Approved Equal”. Each wire rope shall be 800 feet in continuous length (with no internal splicing) for installation on the Monongahela Incline, PRT Stock No. 121996, as specified herein. TECHNICAL DATA 2.1 The wire rope shall comply with ANSI B77.2 and be constructed using the Dyforming process. The Dyforming process produces high density wire rope made with compacted strands. Dyform-6 is a six strand construction with an Independent Wire Rope Core (IWRC). It meets or exceeds strength requirements of EEIPS rope. The compact strand construction provides better flexibility, bending life, and crush resistance than standard 6-strand ropes. Compacting also produces a smooth surface for reduced bearing pressure and increases the steel area by 100% for higher abrasion resistance and less sheave wear. 2.2 The wire rope shall be pre-stretched in accordance with Federal Standard RRW.410D prior to shipment and delivery. 2.3 The wire rope shall have a minimum nominal breaking strength of 79.9 tons. 2.4 The wire rope shall be constructed to attain the best balance of strength, abrasion resistance, crush resistance, and bending fatigue resistance for each application. 2.5 The wire rope shall be of uniform size, shape, and quality throughout and shall be free from all flaws, kinks, and defects. 2.6 The wire rope diameter shall not exceed 5% of the nominal rope diameter in accordance with Federal Standard RRW.410D.
