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HISTORY BACKGROUND DOCUMENT IP 9-6-1

Refrigerated Storage Tanks Page 1 of 2

Rev. 1 March 1998

THIS INFORMATION FORAUTHORIZED COMPANY USE ONLYEXXON RESEARCH AND ENGINEERING COMPANY FLORHAM PARK, N.J.

INTERNATIONAL

PRACTICE

BACKGROUND HISTORY DOCUMENTATION

FOR CORRESPONDING PARAGRAPHS OF IP 9-6-1 (REV. 1)

S [H] 5.2 Specifies impact requirements and procedures to ensure that materials with demonstrated toughness are

used for primary components to prevent brittle fracture of the pressure containing components.

S [H] 6.4 Ensures that elevated tank supports will not fail due to fire or exposure to the liquefied product to preventa catastrophic failure of the tank during an incident.

S [H] 6.5 Prevention of vessel failure by ensuring all applicable loads and load combinations are taken into accountin the design of the pressure vessel.

S [H] 6.6 Prevention of vessel failure by ensuring all applicable loads and load combinations are taken into accountin the design of the pressure vessel.

S [H] 6.7 Prevention of vessel failure during field hydrostatic testing.

S[H]

6.8 Specifies minimum roof load to prevent roof failure and loss of containment.

S [H] 6.17 Prohibits bottom entry nozzles for penetrating both the inner and outer tank bottoms to ensure tankintegrity due to the difficulty in designing a bottom entry nozzle considering thermal, pressure andsettlement loadings.

S [H] 6.18 Specifies design criteria to prevent failure of the roof due to leaks in top entry piping.

S [H] 6.22 Limits to use of bellows type expansion joints to secondary components due to mechanical integrityconcerns with bellows joints in primary pressure components in refrigerated tank service.

S,O [H] 7.2 Specifies minimum design requirements for the prevention of falls and injuries.

S [H] 7.3 Specifies minimum design requirements for the prevention of falls and injuries.

S [H] 7.6 Specifies minimum design requirements for the prevention of falls and injuries.

S,R [H] 8.6 Specifies impact testing requirements and procedures to ensure that production welds have the requiredtoughness to prevent brittle fracture of the pressure containing components.

S [H] 8.7 Specifies impact testing requirements and procedures to ensure that weld metal and heat affected zone ofproduction welds used in primary components have the required toughness to prevent brittle fracture.

S [H] 8.9 Specifies requirements to ensure that repairs made to high strength steels have adequate resistance tobrittle fracture.

S,R [H] 9.2 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S,R [H] 9.3 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S,R [H] 9.4 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failure during operation.

S,R [H] 9.5 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S,R [H] 9.6 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

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IP 9-6-1 HISTORY BACKGROUND DOCUMENT

Page 2 of 2 Refrigerated Storage Tanks

Rev. 1 March 1998

THIS INFORMATION FORAUTHORIZED COMPANY USE ONLYEXXON RESEARCH AND ENGINEERING COMPANY FLORHAM PARK, N.J.

INTERNATIONAL

PRACTICE

S,R [H] 9.7 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S,R [H] 9.8 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S,R [H] 9.9 Specifies minimum weld quality control requirements, NDE, to ensure that there are no fabrication relateddefects that could cause a brittle fracture or other failures during operation.

S [H] 10.1 Prevents failure of the pressurized storage sphere due to overpressure or vacuum.

S [H] 10.2 Prevents failure of the pressurized storage sphere due to overpressure or vacuum.

S [H] 10.3 Specifies requirements to prevent failure of fireproofing in then event of a spill of the refrigerated liquid.

S [H] 10.4 Provides for adequate fire fighting equipment for both fighting fires and cooling of the tank to preventfailure due to the intense heat from nearby fires.

Notes:

(1) Each paragraph to identify the Purpose Code(s) of the corresponding paragraph number of the applicable International Practice (IP).

(2) The symbol [H] is used to denote all History Background Paragraphs which are for INFORMATION ONLY.

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