Steam Valve Salients - AS 2024.04.26.xlsx

This is a procurement specification document detailing steam valve requirements for the USS Frank Cable (T-ALT AS-39-19018), a naval auxiliary ship. The specification outlines salient characteristics and design data for six distinct steam valve systems required for the vessel's propulsion and auxiliary systems.

The procurement requires six steam valve assemblies: two 6-inch superheater steam stop valves with motor-operated (MOV) controls for port and starboard applications; two 5-inch desuperheater outlet steam stop valves with MOV controls for port and starboard applications; one 2.5-inch desuperheater steam to soot blowers valve; and one 4-inch main feedwater stop/check valve to economizer and boiler. All valves feature 600LB pressure class rating with bolted bonnet construction, CR-13 stems, and Stellite hard-faced seats and discs per ASME B16.10 and B16.34 standards. The first four valves incorporate 440V, 3-phase, 60Hz motor operators with 15-second cycle times and two contactors for push-button close/open functions with indicator lights. Construction materials vary by application: CR-MO (Cast or Forged) per A217 Grade WC6 or A182 Grade F11 CL2 for superheated steam applications, and Carbon Steel per A216 Grade WCB or A105 for lower-temperature applications. Design pressures range from 705 psig for superheated steam systems to 920 psig for the feedwater system, with operating temperatures from 263°F to 875°F depending on the application.