Section C-1 DFT Specification (SLEP) 08Mar26.pdf

This document is a Specification for Boiler, Deaerating Feed Tank Installation (SLEEP) for the United States Coast Guard (USCG) at USCGC HEALY.

The specification details requirements for providing and installing one deaerating feed tank (DFT) with feedwater treatment system, renewing the existing obsolete boiler PLC, and replacing burner sequencing controls on two Kewanee Inc. auxiliary oil-fired boilers rated at 17,250 lb/hr (500 HP, 16,738 kBTU/hr) with 125 psig working pressure. The contractor must install equipment capable of supporting a firing rate of 16,738 MBH and ensure proper functioning through limited technical support. Key components include the DFT (designed for 20,000 lb/hr steaming capacity, 600-gallon minimum storage, 7 ppb dissolved oxygen at rated capacity, 10 psig positive pressure, cylindrical orientation preferred), two feedwater pumps with cross-connects, condensate pumps, vent condensers with venting to 95°F dewpoint, salinity monitoring systems, and feedwater treatment systems compliant with NSTM 220 v2. The boiler PLC controls must replicate all existing Koyo DL 405 functions for managing fuel control, water level, startup/shutdown sequences, alarms, and status monitoring while operating on 115VAC single-phase 60-Hz power. All piping must comply with ASME codes, utilize materials per USCG drawings (copper-nickel alloys where specified), and include provisions for equipment isolation, vibration mitigation, and structural integrity under dynamic marine conditions including 45-degree ship roll, 10-degree pitch, and 9-foot heave. Foundations must accommodate weights, dynamic loads, thermal expansion, and icing/snow loads with proper drainage and alignment. The contractor must handle all interferences per SFLC Std Spec 0000 and prepare new construction details per SFLC Std Spec 6310.