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SP0178-2007 <br />Tank Shell —+ <br />Screwed Nipple for Use During <br />Fabrication and Heat Curing of <br />Thermosetting Linings <br />It is recommended that <br />the plug be left out for <br />venting and the hole plugged <br />with grease to prevent <br />atmospheric corrosion of <br />the threads. <br />Inside of Tank or <br />Vessel <br />This area is inaccessible for <br />lining application <br />Internal Dished Head <br />Installation of Curved (Preferred) or Flat <br />Plate, Fully Seal -Welded and Ground, to <br />Eliminate Inaccessable Area for Proper <br />Surface Preparation and Lining in <br />Multi -Compartment Tanks Constructed with <br />Dished Heads Between Compartments <br />FIGURE A9 <br />A technique (detail of fabrication) to allow for good continuity of lining application for inaccessible areas such as those in <br />multicompartment tanks or vessels. <br />Slip-on Flange -•'• <br />Inside of Tank or Vessel <br />50 mm <br />(2 in.) <br />inside <br />Grind and Radius <br />mm (1.0 in.) thread nipple <br />1 <br />If an alloy flange is required, <br />the designer should consider <br />the use of insulating sleeves <br />and washers as a protection <br />against galvanic corrosion. <br />Overall length shall be as <br />short as possible. <br />1 <br />Line completely to bolt <br />circle. <br />FIGURE A10 <br />Minimum 50 -mm (2 -in.) diameter nozzle required for most thin-film linings. Thicker -film linings may require a larger -diameter <br />nozzle. This diagram also illustrates fabrication practice where a threaded connection is required in a tank or vessel that requires <br />a holiday -free lining. <br />10 NACE International <br />