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T-172(Rev.12/17) Storage Tank or Vessel Monthly "In-Service" Inspection Visually survey the tank, attachments and surrounding areas for unreported conditions, or perform gauging and alarm checks. Not all procedures maybe performed by the same individual. For Canadian sites, note that routing, distribution and control room/control center coordination will be as per local or GTOM procedure. Visually scan the tank shell for product leaks, major buckling, cracks or tears in the steel, visible bulges, deformation or distortion, significant flaking paint or Shell corrosion. If the tank is insulated,including portion of its piping,visually scan for damage to insulation,caulking,weather proofing and evidence of water ingress. Visually scan the bottom plate projection or chime for"knife gel, rrosi or plate leafing corrosion;corroded chime including corroded shell-to-chime welds ere paint has peeled off. If there is an existing sealant,c ck f am . Include inspection underneath chime where corroded support such as a steel Chime channel is present. For double bottom tanks,verify there is in the space between the bottoms(interstitial space). Visually scan the roof for sinking,pools of product or blocked drains and ts. Roof Visually scan the Seals to determine in place,intact and free of defects. ( les,tears,loss of contact) Visually scan foundation for water undercutting of the foun (washouts) or new large cracks in excess of 3/4" that have been determined to be new or Foundation growing.Visually scan for vegetation growth such as weeds s scan for differential settlement. Verify water drains away from tank and foundation. Appurtenances include valves,drains,mixer,dresser coupli w n irder and stairs and lighting.Visually scan for significant signs of breakage or leaks. Evaluate bladder if equipped. Verify that thermal relief isola ocked/tagged open and in correct operating position. Visually examine other tank fittings and components such acables,drains and roof ladder are in good condition,i.e.no leaks,malfunction, damage or corrosion. Visually scan the level,pressure and auges are in good condition and in proper operating position(not isolated). Verify vents are not blocked. Where readily and safely accessible,visually scan tanks equip a protection systems:no blockages to the spray nozzles or deflector plates,base foam Appurtenances injection valve is in correct operating position. HIHI Alarm Check the HIHI Alarm in accordance with LOP,I&M Manual,or GUM91110 06-001. Tank Gauge Hi Level Handline the tank for monthly measurement purposes. The o be involved to confirm handline,MMI readings,and P&CD and high level alarm set points. Setting Verification If the handline and MMI are out of tolerance,the calibrate activity ' gered through ME notification. PAGE 2OF2