API 653 Section 4 Practice
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- Answer: 4.1.1 When the results of a tank inspection show that a
change has occurred from the original physical condition of that tank,
an evaluation shall be made to determine its suitability for continued
use.
- Answer: 4.1.2 This section provides an evaluation of the suitability of
an existing tank for continued service, or for a change of service, or
when making decisions involving repairs, alterations, dismantling,
relocating, or reconstructing an existing tank.
, - Answer: 4.1.3 The following list of factors for consideration is not all-
inclusive for all situations, nor is it intended to be a substitute for the
engineering analysis and judgment required for each situation:
a.internal corrosion due to the product stored or water bottoms;
b.external corrosion due to environmental exposure;
stress levels and allowable stress levels;
c.properties of the stored product such as specific d.gravity,
temperature, and corrosivity;
e. metal design temperatures at the service location of the tank;
f. external roof live load, wind, and seismic loadings;
g. tank foundation, soil, and settlement conditions;
h. chemical analysis and mechanical properties of the materials of
construction;
i. distortions of the existing tank;
j. operating conditions such as filling/emptying rates and frequency
- Answer: 4.2 Tank Roof Evaluation
4.2.1.1 The structural integrity of the roof and roof support system shall
be verified
, - Answer: 4.2.1.2 Roof plates corroded to an average thickness of less
than 0.09" in any 100 sq. inch area or roof plates with any holes
through the roof plate shall be repaired or replaced.
- Answer: 4.2.2 Fixed Roofs
Roof support members (rafters, girders, columns, and bases) shall be
inspected for soundness by a method acceptable to the responsible
inspector. Distorted (such as out-of-plumb columns), corroded, and
damaged members shall be evaluated and repaired or replaced if
necessary. Particular attention must be given to the possibility of severe
internal corrosion of pipe columns (corrosion may not be evidenced by
external visual inspection).
- Answer: 4.2 Tank Roof Evaluation
4.2.2.2 When a frangible roof-to-shell joint is required, evaluate for
items impacting compliance with requirements under API 650, Section
5.10.2.6.
Examples of some items to evaluate include tank bottom-to-shell joint
corrosion or tank roof-to-shell joint modification (such as
reinforcement of the joint, attachment of handrail, or other frangible
joint area change.
- Answer: 4.2.3 Floating Roofs
, 4.2.3.1 Areas of roof plates and pontoons exhibiting cracks or punctures
shall be repaired or the affected sections replaced. Holes through roof
plates shall be repaired or replaced.
- Answer: 4.2.3.2 Areas that are pitted shall be evaluated to determine
the likelihood of through-pitting occurring prior to the next scheduled
internal inspection. If so, the affected areas shall be repaired or
replaced.
- Answer: 4.2.3.3 Roof support systems, perimeter seal systems,
appurtenances such as a roof rolling ladder, anti-rotation devices,
water drain systems, and venting systems shall be evaluated for needed
repairs or replacements.
- Answer: 4.2.3.4 Guidance for the evaluation of existing floating roofs
shall be based on the criteria of API 650, Annex C, for external floating
roofs, and Annex H for internal floating roofs. However, upgrading to
meet this standard is not mandatory.
- Answer: 4.2.4 Change of Service
4.2.4.1 Internal Pressure
All requirements of the current applicable standard (e.g. API 650, Annex
F) shall be considered in the evaluation and subsequent alterations to
the tank roof and roof-to-shell junction.
Questions with Verified Correct
Answers
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Services Offered
• Proctored Exam Assistance
• Online Class Management (Full Course Support)
• Exam Preparation & Study Materials
• Assignments and Coursework Support
• Essay and Research Paper Writing
• Discussion Posts & Responses
• Editing and Proofreading
• Confidential Academic Consultation
Helping Students Achieve Academic Excellence
- Answer: 4.1.1 When the results of a tank inspection show that a
change has occurred from the original physical condition of that tank,
an evaluation shall be made to determine its suitability for continued
use.
- Answer: 4.1.2 This section provides an evaluation of the suitability of
an existing tank for continued service, or for a change of service, or
when making decisions involving repairs, alterations, dismantling,
relocating, or reconstructing an existing tank.
, - Answer: 4.1.3 The following list of factors for consideration is not all-
inclusive for all situations, nor is it intended to be a substitute for the
engineering analysis and judgment required for each situation:
a.internal corrosion due to the product stored or water bottoms;
b.external corrosion due to environmental exposure;
stress levels and allowable stress levels;
c.properties of the stored product such as specific d.gravity,
temperature, and corrosivity;
e. metal design temperatures at the service location of the tank;
f. external roof live load, wind, and seismic loadings;
g. tank foundation, soil, and settlement conditions;
h. chemical analysis and mechanical properties of the materials of
construction;
i. distortions of the existing tank;
j. operating conditions such as filling/emptying rates and frequency
- Answer: 4.2 Tank Roof Evaluation
4.2.1.1 The structural integrity of the roof and roof support system shall
be verified
, - Answer: 4.2.1.2 Roof plates corroded to an average thickness of less
than 0.09" in any 100 sq. inch area or roof plates with any holes
through the roof plate shall be repaired or replaced.
- Answer: 4.2.2 Fixed Roofs
Roof support members (rafters, girders, columns, and bases) shall be
inspected for soundness by a method acceptable to the responsible
inspector. Distorted (such as out-of-plumb columns), corroded, and
damaged members shall be evaluated and repaired or replaced if
necessary. Particular attention must be given to the possibility of severe
internal corrosion of pipe columns (corrosion may not be evidenced by
external visual inspection).
- Answer: 4.2 Tank Roof Evaluation
4.2.2.2 When a frangible roof-to-shell joint is required, evaluate for
items impacting compliance with requirements under API 650, Section
5.10.2.6.
Examples of some items to evaluate include tank bottom-to-shell joint
corrosion or tank roof-to-shell joint modification (such as
reinforcement of the joint, attachment of handrail, or other frangible
joint area change.
- Answer: 4.2.3 Floating Roofs
, 4.2.3.1 Areas of roof plates and pontoons exhibiting cracks or punctures
shall be repaired or the affected sections replaced. Holes through roof
plates shall be repaired or replaced.
- Answer: 4.2.3.2 Areas that are pitted shall be evaluated to determine
the likelihood of through-pitting occurring prior to the next scheduled
internal inspection. If so, the affected areas shall be repaired or
replaced.
- Answer: 4.2.3.3 Roof support systems, perimeter seal systems,
appurtenances such as a roof rolling ladder, anti-rotation devices,
water drain systems, and venting systems shall be evaluated for needed
repairs or replacements.
- Answer: 4.2.3.4 Guidance for the evaluation of existing floating roofs
shall be based on the criteria of API 650, Annex C, for external floating
roofs, and Annex H for internal floating roofs. However, upgrading to
meet this standard is not mandatory.
- Answer: 4.2.4 Change of Service
4.2.4.1 Internal Pressure
All requirements of the current applicable standard (e.g. API 650, Annex
F) shall be considered in the evaluation and subsequent alterations to
the tank roof and roof-to-shell junction.
