TGI 38JC259301A01.pdf

This is a Task Group Instruction (TGI) for chemical flush cleaning of the VCHT (Vacuum, Collection, Holding and Transfer) piping system throughout the USS HOWARD (DDG-83). The work involves chemically cleaning and flushing the forward and aft VCHT piping systems, requiring coordination between sanitary space work items to ensure uninterrupted crew access to facilities. The contractor must perform hydrostatic testing at 68 PSIG and conduct borescope inspections of internal surfaces for calcium buildup.

Key specifications include work on Class P-2 and P-3b piping, with project dates running from April 14, 2025 to August 19, 2025. The scope includes installing 20 linear feet each of 1-1/2 inch and 2 inch VCHT system piping with associated fittings. The material list details required components including metallic tubes, elbows, sleeves, backing rings, and adapters. Quality assurance requirements include documenting hydrostatic test results on QA Form 28 and maintaining pH levels between 6-8 during neutralization processes. The work will be performed under Project/JWO No. JC2 for System 59311.