ANTFTL_26157 COMPANY SOW_welding repairs_buoy door_updated.pdf

SCOPE OF WORK

WELDING REPAIRS ON 26157 HULL/BUOY DOOR

Work Statement

Replace corroded sections of the aluminum hull plating and dive door threshold relating to the application of the S.S. chafe strips.

Work to include:

• Prepare the boat for safe welding operations.

• Interference removals to access affected material.

• Replace affected metal sections.

• Perform NDT dye-pen test on welds.

• Reinstall S.S. chafe sections.

• Reinstall interferences.

Scope of work

Job 1.0; Prepare vessel for the welding repairs:

• Install protection as needed and maintain during the course of the project.

• Contractor to remove and dispose of approximately 95 gallons of fuel. Clean fuel tank for gas free certificate.

• Schedule the Marine Chemist to inspect the fuel tank and surrounding bilge area associated with weld procedures and provide a gas free certificate.

• Schedule a certified OSHA 29CFR1915 confined and enclosed space Part B, Competent

Person to maintain the gas free certificate daily prior to the welding and hot work procedures.

Job 2.0; Interference removals to include the following:

• Remove deck access covers over the fuel tank access ports along with fuel tank sender and other possible access ports for purposes of pumping and cleaning the fuel tank.

• Removal of davit.

• Removal of starboard mechanically fastened deck plate in the location of the dive door.

• Remove vertical access plates on forward and aft sections of interior bulwark associated with dive door.

• Address and remove any foam located beneath the deck plate that may prevent access and or ability to perform a safe welding procedure.

• Secure the wire harness below the deck plate to prevent damage or interference from the welding repair process.

• Disconnect batteries to isolate electrical and assure the vessel is safe to conduct welding work on the hull plating.

Job 3.0; Aluminum repair process.

• Layout and template section of aluminum hull plate and dive door opening to be replaced.

• Remove wasted and corroded aluminum back to solid which will accept new welds.

• Fabricate and fit up new hull plate and door threshold sections in 5086 Aluminum to match existing thickness.

• Follow proper weld procedures and paperwork to assure vessel is in a condition to be welded upon.

• Confirm the vessel has been electrically isolated prior to any welding.

• Weld new sections of 5086 grade aluminum plate, same thickness to match existing.

• Layout and design of the repair will match existing structure in like and kind.

• Perform a certified NDT liquid penetrant test per SNT-TC-1A (DyePen Test) on new welds.

Job4.0 Interference reinstalls.

• Install supplied stainless steel chafe plates will be fit in place to the new aluminum utilizing the vessel supplied rivnuts to match previous installation.

• Stainless Steel plates will be installed with S.S. fasteners.

• Replace any foam that may have been removed.

• Reinstall vertical Delrin strips. If new ones are not supplied, then old ones will be utilized.

• Layout and install new dive door latch receiver, supplied by vessel. Set door in place to assure proper fit and securing of the dive door. If new latch is not supplied, then old receiver will be used.

• Reinstall all fuel tank components once gas free certificate is no longer required.

• Secure wire harness under deck as needed.

• Reinstall all deck plates (with 5200 sealant).

• Provide copies of all paperwork and certificates for:

o Gas free certificate from Marine Chemist o Copy of Competent Person Certificate.

o Copy of the welder certification for 5086 aluminum.

o Copy of the material certifications.

o Copy of the certification for the tester doing the dye-pen NDT test.

MPC’s and drawings are provided for reference.