Exhibit A - Scope Of Services
Gas Holder Inspection
;-MCDERMOTT,
Document Title: Document No. Rev:
inspection Plan for Gas Holder 239822-000-SP-PL-00001 0
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a. Label tank at manholes with “Confined Space” signage
b. The tank is considered confined space for entry until atmosphere is checked and confirmed
for acceptable levels of Oz, CO2, CO, and H25. CB&I will moniter and evaluate the tank
atmosphere for acceptable levels,
c. After confirming atmosphere is acceptable for entry and confirming the Isolation Plan is in
place, proceed with Non Pemnit Confined Space entry, hole-watch not required
SCOPE OF VISUAL INSPECTION
Tank Shell Inspection
Perform shell visual inspections on the inside and outside of the tank of any accessible exposed areas of the
shell. Any areas that show excessive amounts of corrosion or any shell distortions shall be measured and
documented. Also document any temporary lugs, weld scars or lap welded patch plates if present.
Tank Roof Inspection
Perform visual inspection of the exterior of the roof. Note any signs of damage, distortion, and corrosion.
Document any temporary lugs, welds scars, or lap weld patch plates
Tank Bottom inspection
Perform a through visual inspection of the tank bottam plate surfaces and bottom lap welds, documenting
any areas that show signs of damaged coatings, leaks, excessive top side corrosion, surface deformations,
cracks, laminations or weld flaws.
Note that access to the tank bottom is limited when the piston in in the maintenance position and that the
inspection may be required to take place by viewing through the piston manhole.
Shell Appurtenance Inspection
Visually inspect all shell appurtenances outside of the tank including shell nozzles, manways, ladders, level
gages, instrumentation, pressure relief, and stairways. Document any damage such as cracks, shell
deformations due to excessive piping loads or excessively pitted members. Visually inspect all shell
appurtenances from the inside of the tank including shell nozzles, manways internal piping, level gages and
ladders. Document any damage such as cracks, shell deformations due to excessive piping loads or
excessively pitted members
Piston System
Visually inspect ali parts of the piston system including pulleys, shafts, cables, counter weights, piston, and
seal diaphragm. Document any damage that may inhibit the proper operation of the piston system
INSPECTION REPORT
The inspection report will include a summary of the inspection findings, photographs and a completed
inspection checklist. Any recommendations for repair or further inspection will be included in the report.
ENGINEERING EVALUATION
An engineering evaluation will be performed based on assessing the results of this inspection te determine
if the tank and foundation are structurally sound and are suitable for service. In addition, the engineering
evaluation will provide recommendations for the repairs to the tank, foundation, and provide quidance for
retesting the tank.
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