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ITEM 1: U/W Bow Thruster Zinc Anode, Renew 1. SCOPE 1.1 Intent. This work item describes the requirements for the Contractor to renew U/W bow thruster zinc anodes and install new bow zinc anodes liste... ITEM 1: U/W Bow Thruster Zinc Anode, Renew 1. SCOPE 1.1 Intent. This work item describes the requirements for the Contractor to renew U/W bow thruster zinc anodes and install new bow zinc anodes listed in Table 1. TABLE 1 – zinc anode description QTY Type / PART NUMBER ANODE DESCRIPTION Location note 6 ZSS-12 12 lb., 1.25in. x 3in. x 12in.(16 Inch Strap) Bow Thruster Tunnel (Figure 1) Remove existing welded zinc anodes and install new bolts on zinc anodes 6* ZSS-12 12 lb., 1.25in. x 3in. x 12in.(16 Inch Strap) Bow Thruster Tunnel (Figure 1) Install missing bolts on zinc anodes *During production, Shipbuilder has installed only six zinc anodes in the Bow Thruster Tunnel and six zinc anodes were missing in the Bow Thruster Tunnel. 1.2 Government-furnished property. Nome. 2. REFERENCES Coast Guard Drawings Coast Guard Drawing 418A-WMSL-100-001, Rev B, General Arrangements Coast Guard Drawing 418A-WMSL-801-001, Rev A, Booklet of Plans Coast Guard Drawing 750-WMSL-100-013, Rev L, Unit 1210 Structure - Inner Bottom to 1st Platform - FR 10 TO FR 22 (ASC100121) (UNSIGNED Coast Guard Drawing 750-WMSL-633-001, Rev D, Installation of Cathodic Protection System (ASC633001) Coast Guard Drawing 750-WMSL-633-500, Rev F, Installation of Cathodic Protection System (ASC633001) NAVSEA Drawing 803-921865 Rev R, Cathodic Protection System, Hull Zinc Anodes Coast Guard Publications Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2020, General Requirements Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2020, Welding and Allied Processes Other References Commercial Item Description (CID) A-A-59313, Nov 2003, Thread Compound; Anti seize, Zinc Dust-Petrolatum MIL-A-18001, Aug 2008, Anodes, Sacrificial Zinc Alloy (Commercially Accepted - ASTM B418) MIL-S-24913/3, Dec 2020, Stud, Welding & Arc Shields (Ferrules): Type V, Class 1 ,4, 5, 5A, Corrosion Resistant Steel, for Direct Energy Arc Welding MIL-N-25027, April 1995, Nut, Self-Locking, Heavy Hex (Non Metallic insert) 250 Degree and 450 Degrees F, UNJC-3B. ¼ Through 2 ½ Inch Nominal Diameters, Nickel-Copper Alloy FF-W-100C, Jan 1969, Nut , Washer Lock (Tooth), 3. REQUIREMENTS 3.1 General. 3.1.1 CIR. None. 3.1.2 Tech Rep. Not Applicable 3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, (Vessel component, space, and equipment protection). 3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences). 3.1.5 Welding requirements. The Contractor must perform all welding and allied processes, and NDE in accordance with SFLC Std Spec 0740. 3.1.6 Diver services. The Contractor must provide diver services to install zincs in Bow Thruster Tunnel in accordance with SFLC Std Spec 0740. 3.1.7 Work locations. The concerned work area is listed in Table 1. See the Coast Guard Drawings in Section 2 References for guidance, locations, and details. 3.2 Zinc removal. The Contractor must remove and dispose bow thruster zinc anodes listed on Table 1 in accordance with SFLC Std Spec 0740. Dispose removed zinc anodes in accordance with all Federal, state, and local regulations. 3.3 Bow thruster anodes renewal. The Contractor must install bow thruster anodes listed in Table 1 as shown on Coast Guard Drawing 750-WMSL-633-001 and Figure 1. 3.3.1 Crop off and scrap existing six (6) zinc anodes on in accordance with SFLC Std Spec 0740. Existing installed anodes welded on type. Grind all sharp edges down smooth to the adjacent surface. 3.3.2 Supply and install stainless steel mounting studs listed in Table 2 to mount bolt on type zinc anodes in accordance with 750-WMSL-633-001, NAVSEA Dwg 803-921865, Figure 1 and SFLC Std Spec 0740. TABLE 2 – zinc anode welding stud materials QTY PART NUMBER ANODE DESCRIPTION MATERIAL TYPE 24 FB81-421608 or Equal Stud Welding Type V, Style B, ½-13UNC-2A-X 1 ¾ BW CRS 316L Z( MIL-S-24913/3) 24 FB36-424384 or Equal Nut, Self-locking ½ 13UNJC-3B ZINC PLD (MIL-N-25027) 24 F57-312316 or Equal Washer Lock Tooth for ½ Inch Bolt ZINC PLD (FF-W-100) NOTE FOR BOLT ON TYPE ZINC, DRILL A HOLE AT EACH END OF THE STRAPS. USE A HOLE DIAMETER SUITABLE TO THE STUDS. 3.3.3 The Contractor-must supply and install bolt-on zinc anodes (i.e. Part No. ZSS-12, Quantity 12) in accordance with 750-WMSL-633-001 and NAVSEA Dwg 803-921865 and Figure 1. Mounting surfaces for bow thruster zinc anode must be bare metal cleaned. Apply anti seize compound, conforming to (CID) A-A-59313, to studs before the zinc anode are installed. Nut must be tighten to 35 Foots/Pounds of torque. 3.4 Electrical resistance testing. The Contractor must measure the electrical resistance between each new zinc anode surface and adjacent metal ship structure, utilizing an OHM meter and a scale, to ensure that it is less than 0.1 ohm. Submit a CFR. 3.5 Documentation . The Contractor must provide photograph of each anode installation in the bow thruster tunnel with CFR. 4. NOTES location will be 32nd Street naval base, Tenth Avenue Marine Terminal, or Broadway pier san diego ca 92101