Transformer_CO_20-21_factory_drawings.pdf

This document consists of factory drawings for Transformer 21 at Colorado Substation, prepared for the City of Palo Alto Utilities Department in California. The drawings provide detailed specifications and technical schematics necessary for the contractor to understand the transformer's configuration, secondary bushing locations, gasket attachment points, and oil circulation pathways. The technical documentation serves as the reference material for qualified contractors bidding on the secondary bushing repair contract, enabling them to assess the scope of work, identify specific components requiring gasket replacement, and plan the removal, replacement, and reinstallation procedures. The drawings include dimensional specifications, component labeling, and oil system configurations critical for contractors to develop accurate project timelines, labor estimates, and material requirements for the bushing re-gasketing work.

The factory drawings establish the baseline technical specifications against which all work must be performed and inspected. Contractors must reference these drawings when conducting pre-work assessments, determining equipment needs such as oil processing and storage capacity, and planning the sequence of operations for partial oil draining, gasket replacement at bushing flanges and manways, pressure testing, and oil refill. The drawings are essential for understanding the transformer's current condition, identifying potential complications during gasket removal and replacement, and ensuring that post-completion testing validates the restoration of the transformer's integrity and service readiness in accordance with manufacturer specifications and City standards.