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c. ___ Inspect the bottom-to-foundation seal, if any. <br />C.1.2.2 Internal (Floating Roof Tank) <br />a. ___ Visually inspect for grooving, corrosion, pitting, and coating failures. <br />C.1.2.3 Riveted Shell inspection <br />a .___ Inspect external surface for rivet and seam leaks. <br />b. ___ Locate leaks by sketch or photo (location will be lost when shell is abrasive cleaned for <br />painting). <br />c. ___ Inspect rivets for corrosion loss and wear. <br />d. ___ Inspect vertical seams to see if they have been full fillet lap welded to increase joint <br />efficiency. <br />e. ___ If no record exists of vertical riveted seams, dimension and sketch (or photograph) the <br />rivet pattern: number of rows, rivet size, pitch length, and note whether the joint is butt <br />riveted or lap riveted. <br />C.1.2.4 Windgirder (Floating Roof Tanks) <br />a. ___ Inspect windgirder and handrail for corrosion damage (paint failure, pitting, corrosion <br />product buildup), especially where it occurs at tack welded junctions, and for broken welds. <br />b. ___ Check support welds to shell for pitting, especially on shell plates. <br />c. ___ Note whether supports have reinforcing pads welded to shell. <br />C.1.3 SHELL APPURTENANCES <br />C.1.3.1 Manways and Nozzles <br />a. _X_ Inspect for cracks or signs of leakage on weld joints at nozzles, manways, and <br />reinforcing plates. <br />b. _X_ Inspect for shell plate dimpling around nozzles, caused by excessive pipe deflection. <br />c. _X_ Inspect for flange leaks and leaks around bolting. <br />d. ___ Inspect sealing of insulation around manways and nozzles. <br />e. _X_ Check for inadequate manway flange and cover thickness on mixer manways. <br />C.1.3.2 Tank Piping Manifolds <br />a. _X_ Inspect manifold piping, flanges, and valves for leaks. <br />b. ___ Inspect fire fighting system components. <br />c ._X_ Check for anchored piping which would be hazardous to the tank shell or bottom <br />connections during earth movement. <br />d. ___ Check for adequate thermal pressure relief of piping to the tank. <br />e. ___ Check operation of regulators for tanks with purge gas systems. <br />f. ___ Check sample connections for leaks and for proper valve operation. <br />g. ___ Check for damage and test the accuracy of temperature indicators. <br />h. _X_ Check welds on shell-mounted davit clips above valves 6 inches and larger. <br />C.1.3.3 Autogage System <br />a. ___ Inspect autogage tape guide and lower sheave housing (floating swings) for leaks. <br />b. ___ Inspect autogage head for damage. <br />c. ___ Bump the checker on autogage head for proper movement of tape. <br />d. ___ Identify size and construction material of autogage tape guide (floating roof tanks). <br />e. ___ Ask operator if tape tends to hang up during tank roof movement (floating roof tanks). <br />f. ___ Compare actual product level to the reading on the autogage (maximum variation is 2