(1) Recognize an abnormal or flawed condition
(2) Respond accordingly to prevent an unsafe or hazardous condition from occurring or
to correct such a condition at any stage of the construction or operation of the facility
or component
A.5.4.2 See ASCE 56, Subsurface Investigation for Design and Construction of
Foundation for Buildings, and API 620, Design and Construction of Large, Welded,
LowPressure Storage Tanks, Appendix C, for further information. A.5.5 Soil movement due to freezing of water is of two general types, as follows:
(1) The freezing of in situ water causes volumetric expansion of a moist soil.
(2) Frost heave is caused by migration of water to a zone of freezing and a continual
growth of ice lenses. A.5.7.5 Slope protection and impounding area paving are examples of incidental
nonstructural concrete use. A.6.4.4 For information on internal combustion engines or gas turbines exceeding 7500
horsepower per unit, see NFPA 850, Recommended Practice for Fire Protection for Electric
Generating Plants and High Voltage Direct Current Converter Stations. A.7.2.1.4 Operating requirements for prevention of stratification are located at Section 14.7. A.7.2.2.4 The OBE ground motion need not exceed the motion represented by a 5 percent
damped acceleration response spectrum having a 10 percent probability of exceedance within
a 50year period.
A.7.2.7.1 Foundation designs and container installations should account for applicable
sitespecific conditions, such as flood loads, wind loads, and seismic loads. The Canadian
Foundation Engineering Manual, published by the Canadian Geotechnical Society; ASCE
56, Subsurface Investigation for Design and Construction of Foundation for Buildings; and
Appendix C of API 620, Design and Construction of Large, Welded, LowPressure Storage
Tanks, can be used as guides for the subsurface investigation. A.7.2.7.4(3) It might not be practical to add a cathodic protection system to an existing
tank's outer tank bottom, because of integral electrical conductivity of the bottom to the tank
or plant ground and lightning protection system. Grounding can make a cathodic protection
system ineffective.
A.7.2.7.5(D) Moisture accumulation in the conduit can lead to galvanic corrosion or other
forms of deterioration within the conduit or heating element. A.7.3.1.2(2) API 620 defines examination as either radiographic or ultrasonic examination. A.7.8.5.3 For doublewall, perliteinsulated tanks, this can be the governing criterion for
pressure relief valve sizing.
A.7.8.7.3 It is the responsibility of the user to determine whether the insulation will resist
dislodgment by the available firefighting equipment and to determine the rate of heat
(1) Recognize an abnormal or flawed condition (2) Respond accordingly to prevent an unsafe or hazardous condition from occurring orto correct such a condition at any stage of the construction or operation of the facility or componentA.5.4.2 See ASCE 56, Subsurface Investigation for Design and Construction of Foundation for Buildings, and API 620, Design and Construction of Large, Welded,LowPressure Storage Tanks, Appendix C, for further information. A.5.5 Soil movement due to freezing of water is of two general types, as follows: (1) The freezing of in situ water causes volumetric expansion of a moist soil.(2) Frost heave is caused by migration of water to a zone of freezing and a continual growth of ice lenses. A.5.7.5 Slope protection and impounding area paving are examples of incidental nonstructural concrete use. A.6.4.4 For information on internal combustion engines or gas turbines exceeding 7500 horsepower per unit, see NFPA 850, Recommended Practice for Fire Protection for Electric Generating Plants and High Voltage Direct Current Converter Stations. A.7.2.1.4 Operating requirements for prevention of stratification are located at Section 14.7. A.7.2.2.4 The OBE ground motion need not exceed the motion represented by a 5 percent damped acceleration response spectrum having a 10 percent probability of exceedance within a 50year period.A.7.2.7.1 Foundation designs and container installations should account for applicable sitespecific conditions, such as flood loads, wind loads, and seismic loads. The Canadian Foundation Engineering Manual, published by the Canadian Geotechnical Society; ASCE 56, Subsurface Investigation for Design and Construction of Foundation for Buildings; and Appendix C of API 620, Design and Construction of Large, Welded, LowPressure Storage Tanks, can be used as guides for the subsurface investigation. A.7.2.7.4(3) It might not be practical to add a cathodic protection system to an existing tank's outer tank bottom, because of integral electrical conductivity of the bottom to the tank or plant ground and lightning protection system. Grounding can make a cathodic protection system ineffective.A.7.2.7.5(D) Moisture accumulation in the conduit can lead to galvanic corrosion or other forms of deterioration within the conduit or heating element. A.7.3.1.2(2) API 620 defines examination as either radiographic or ultrasonic examination. A.7.8.5.3 For doublewall, perliteinsulated tanks, this can be the governing criterion forpressure relief valve sizing.A.7.8.7.3 It is the responsibility of the user to determine whether the insulation will resist dislodgment by the available firefighting equipment and to determine the rate of heat
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