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DATE: 614J201010:25 Afill PAGE: 18cf19 Internal Bottom and Shell Coating (ADD—Rev.1) 1. The lower 36"of the internal shell and the bottom shall be coated with 24 mils DFT Sherwin Williams Dura- Plate UHS Tank Lining System.Refer to the attached Sherwin Williams'Insta/htion Procedure for Dum- PhO UHS Encut for recommended preparation and application procedures. 2. The BP representative shall arrange to have an independent NACE Level til Inspectorpresent to Ins act Me surface preparation,coating application and coating curing. 3. ME=Verification of Independent NACE Level III Inspection witnessed by the BP representative. 4. The surfaces and joints to be coated shall be fabricated and prepared in accordance with NACE Standard RP-0178(latest Edition)"Design,Fabrication, Surface Finish Requirements and Proper Design Considerations for Tanks and Vesseis to be Lined for immersion Service." a. All rough welds shall be ground to remove sharp edges undercuts,pinholes and other such Irregularities.Chipping can be used to remove sharp edges if followed by grinding. b. Sharp edges and fillets shall be ground to a smooth radius of 114'to 118 .Surfaces shall be free of gouges,deep scratches,slivered steel and other surface flaws. C. Surfaces to be lined shall be free of wax or grease pencil marks,gouges,handling marks,deep stretches,metal stamp marks,silvered steel or other surface flaws.Any flaws shall be repaired by solved cleaning,welding with E701 B 1 E7024 or grinding as required. d. All wells to be lined shall meet the minimum requirements of NACE Weld Precaretion Desionatron"C" as defined in NACE RP-0178. 5. Prepare the surface for application of the internal coating. a. Remove all oil and grease from surface by Solvent Cleaning per SSPC-SP1. It. Sandblast tank bottom and lower shell to Near White Metal Sint Cleaning SSPC-SP70I NACE 2. Blast clean all surfaces using a sharp,angular abrasive for optimum surface profile,2.3 mil profile. C. Remove all weld splatter.The surface to be primed must be clean,dry,and in sound condition. Remove all oil,dust,grease,dirt, loose rust,and other foreign material to ensure good adhesion. d. Clean sandblast material and other debris from prepared surface. Remove and dispose of waste material in approved containers. e. Prime an bare steel the same day as t is cleaned or before gash rusting occurs. I. • , - , Verification of the visual examination(Vn surface preparation is to specified surface finish,cleanliness,dryness,and readiness for application of the coating by the BP representative. S. The SP representative shall verify that the installation conforms to the General Requirements of the 'Installation Procedure for Dura-Plate UHS ED I. a. Temperature,air movement,relative humidity and dew point b. Material handling,storage and preparation, C. Observance of all safety precautions. 7. • • •e Verification of the compliance with all General Requirements by the BP representative B. The specified Primer shall be applied as required following surface preparation. g, • • •• The SP representative shall confirm application of Primer as specified. 10. The Detail Cost shall be applied as required following the application of the Primer. 11. Prellor-UM The BP representative shall confine application of the Detail Coat as specified. 12. The Medium Film Lining(First Coati shall be applied as required fcbvring the application of the Detail Coat 13. • '• The SP representative shall confirm application of the Medium Film Lining(First Coat)as specified. 14. Ali of the specified Inspection shall be performed and documented following the application of the Medium Film Lining(First Coal): a. Visual Inspection. b. Film thickness measurement C. Hardness Testing. d. Holida Detection. 15. 0 • -• The BP representative shall confirm that all Inspection of the Medium Film Lining(First Coal) was performed as specified and documentation is provided. 16. llrelllr -• The BP representative shat mark defects and unacceptable coating with chalk for repair. 17. The coating shall be repaired as the result of defects,unacceptable visual inspection or dry film thickness measurement Repairs shall be performed in accordance with the specifications.Any repairs shall be performed,cured, inspected and tested in accordance with above and vedfied as Indicated.