TGI 38JC259301A01 rev1.pdf

This is a Task Group Instruction (TGI) for chemical flush cleaning of the Vacuum, Collection, Holding and Transfer (VCHT) piping system throughout the USS HOWARD (DDG-83). The work involves cleaning and flushing two VCHT piping systems - one forward and one aft - with procedures including chemical cleaning, neutralization, and borescope inspection. The contractor must coordinate work to ensure uninterrupted availability of crew sanitary spaces.

The work is to be performed between April 14, 2025 and September 24, 2025, requiring special handling of Class P-2 and P-3b piping. Key requirements include hydrostatic testing at 68 PSIG, pH level monitoring between 6-8 during neutralization, and detailed documentation of borescope inspections. The document includes a detailed material list specifying required pipes, elbows, and fittings. Support services will be provided by SRF-JRMC including crane operations, utility services, and safety/QA inspections. The TGI was prepared and approved in February 2024 under project number 59311 with job order 38JC259301.