Job Specification Summary

This is a naval job specification document for CHT (Collective Hygiene Tank) piping work involving chemical cleaning, inspection, and replacement aboard the USS NBU-7 (Ship/Hull No. LCU-1651). The work is being performed during dry-berthing operations at Naval Base San Diego.

Work Scope and Requirements:

The specification requires chemical cleaning of a 300-gallon CHT tank and associated piping systems (totaling 80 feet of 3/4-inch through 2-inch IPS piping), with replacement of 10 feet of piping that failed ultrasonic inspection or chemical cleaning. Key tasks include: disinfecting the CHT tank per 500-5104327 Rev C standards; chemically cleaning the piping system using RYDLYME or equivalent to achieve Level III cleanliness per MIL-STD-3026A; performing borescope inspection of internal piping surfaces; conducting ultrasonic wall thickness measurements at specified intervals; accomplishing a one-hour flush with fresh water and pH neutralization of effluent (6.0-8.0); removing and installing new piping with backing rings fabricated per 009-12 specifications; and witnessing an operating pressure test to verify tightness of all welded and mechanical joints with zero allowable leakage. The work is to be performed in dry-berthing at the FWD Engine Room, WR/WC/SHR spaces, and Equipment Repair Parts/Ordnance Store Room locations.

Administration and Materials:

Work is scheduled from June 1, 2026 to September 30, 2026, with anticipated award on May 1, 2026 and production completion by August 29, 2026. The ICN is 38NBA59303, and SRF control number is 1301357121. SRF will furnish all materials, including piping, fittings, couplings, elbows, tees, flanges, washers, gaskets, and fasteners totaling 105 line items. A Marine Chemist certificate must be submitted upon completion. Torque wrenches will be provided by SRF tool room as required. The supervisor is Avelino L. Reyes Jr., with approval authority at $300/$900 PM level.