API 653 preparation Questions and Answers correct

API 653 preparation Questions and Answers correct Owner API 653 1.2 Overall responsibility for compliance with API 653? Engineer API 653 4.3.1.2 Responsibility - evaluate deterioration of existing shell material? Steel storage tanks built to API 650 and its predecessor API 12c (API 653 1.1.1) What does api 653 cover? Minimum requirements for maintaining the integrity of tanks after they have been placed in service and addresses inspection, repair, alteration, relocation and reconstruction (api 653 1.1.1) What does api 653 provide? Tank foundation, bottom shell, structure, roof, attached appurtenances and nozzles to the face of first flange, first threaded joint or first welding-end connection (api 653 1.1.2) What is the scope of api 653 limited to? API 653 shall govern for tanks that have been placed into service (api 653 1.1.2) In the case of conflict between api 653 and api 650 or it's predecessor api 12c. Which shall govern? Rules or guidelines to cover all the varied conditions which may occur in an existing tank api 653 1.1.5 API 653 does not contain? The regulations shall govern, however if api 653 is more stringent then api 653 shall govern (api 653 1.3) If any provision of api 653 presents a direct or implied conflict with any statutory regulations, which would govern? API 2015, 2016 and api 2217a Where can you find guidelines to safeguard personnel, prevention of fires, explosions and property damage Except in areas specifically designated as safe for hot work, a hot work permit shall be obtained before starting any work that can involve a source of ignition What does api 2009 state in relation to hot work? API 2009 appendix B Where can you find brief information on inerting tanks? Fitness for service API RP 579-1 is? ASNT SNT-TC-1A Personnel qualified and certified in NDE? API RP 2201 Safe hot tapping practices in petroleum industries is? For design and construction of large, welded low pressure storage tanks API standard 620 is? Any work on a tank that changes its physical dimensions or configuration Define an alteration in accordance with api 653? Standard that was in effect at the date of the installation of the component The AS built standard is the? The AS built standard only for those repairs or alterations The standard used for repairs or alterations made after original construction is? 1. Organisation of the jurisdiction where tank is operated 2. Inspection organisation of the licensed and registered insurance company 3. Owner/Operator Name 3 authorised inspection organisations An employee of an authorised inspection agency who is qualified and certified to perform inspections under API 653 Define authorised inspector A change from previous operating conditions involving different properties of the stored product such as, specific gravity or corrosivity and/or different service conditions of temperature and/or pressure What is a change in service The total metal loss, divided by the period of time over which the metal loss occurred Define corrosion rate The portion of the tank bottom or plate within 3" of the inside edge of the shell What is the tank critical zone? A formal, complete inspection as supervised by an authorised inspector of all accessible internal tank surfaces Define internal inspection 1. Installing a shell penetration larger than 12" beneath the liquid level 2. Installing a bottom penetration within 12" of the shell 3. Removing and replacing or adding a shell plate, exceeding 12" dimension 4. Removing or replacing annular ring material, exceeding 12" 5. Installing a new bottom 6. Jacking a tank shell What does a major alteration or repair include The legal entity having both control of and/or responsibility for the operation and maintenance of an existing storage tank Define owner/operator Work necessary to maintain or restore a tank to a condition suitable for safe operation Define repair When the results of a tank inspection show that a change has occurred from the original physical condition When shall an evaluation be made to determine a tanks suitability for use 1. Internal corrosion 2. External corrosion 3. Stress levels and allowable stress levels 4. Properties of the stored product such as specific gravity, temperature and corrosivity 5. Design temperature and service location 6. External roof live load, wind and seismic loading 7. Tank foundation, soil and settlement conditions 8. Chemical + mechanical analysis of the tank materials 9. Distortion of the existing tank 10. Operating conditions such as, filling/emptying rates What factors should be considered when evaluating a tanks suitability for use When corroded to an average thickness of less than 0.09 inch in any 100 inch squared When should roof plates be repaired or replaced All the requirements of API 650 Annex M What should be considered before changing the service of a tank to operate above 200 F Storage tank engineer Who shall conduct the evaluation of an existing tank shell? Each case must be treated as a unique situation and a thorough inspection conducted to determine the nature and extent of corrosion What must be done prior to developing a repair procedure for shell corrosion The corroded or damaged areas shall be repaired The allowable liquid level of the tank reduced The tank retired What shall happen if the requirements of API 653 4.3.3 or 4.3.4 can not be satisfied Foundation settlement Over or under pressuring High wind Poor shell fabrication What are the causes of shell distortion Removed Cracks in the shell to bottom weld shall be Tanks of welded construction that operate at elevated temperatures (exceeding 200F but less than 500F) Define operation at elevated temperature 30,000 pounds per inch squared When the minimum specified yield strength of the shell material is not known, what value shall be assumed? 1. The tank shell shall be evaluated in conformance with API 650 annex M not 653 2. The need for a butt welded annular ring shall be determined and/or installed 3. The shell to bottom joint shall be evaluated for fatigue conditions Existing tanks that were not originally designed and constructed to API 650 annex M shall be evaluated for a change of service to elevated temperatures how? Monitoring the settlement behaviour of tanks What is a recognised practice to assess the integrity of tank bottoms Internal pitting Corrosion of weld joints Stresses placed on bottom plates (by roof supports) Underside corrosion Inadequate drainage Uneven settlement Non homogeneous fill under the tank What are the main causes of tank bottom failure When tank bottom integrity is not detectable visually or through inventory reconciliation When are leak detection systems used API 575 Where are tank leak detection systems listed and discussed Magnetic flux leakage (mfl) tools What are commonly used along with U.T thickness measurement tools to examine tank bottoms No Can the treatment of bottom pitting by non welded repairs be used to increase the minimum remaining thickness Settlement, erosion, cracking and concrete deterioration What are the principal causes of tank foundation deterioration During hydrotest or first filling in cold conditions, after a change to lower temperature service or after a repair/alteration When is brittle fracture most likely to occur 60F and above No known brittle fracture tank failures have occurred at shell metal temperatures above The lowest one day mean temperature as shown in api 650 plus 8c What is the lowest design temperature defined as Restrict to liquid level Restrict the minimum metal temperature Change to lower specific gravity product What options exist to establish a revised safe operating envelope for a tank To assure continued tank integrity What is the purpose of tank inspection An authorised inspector Who shall direct inspections other than those defined? Nature of the product Results of checks Corrosion allowance and corrosion rates Jurisdictional requirements Change in service Leak detection systems What factors must be considered to determine inspection intervals for storage tanks The storage facility tank operations and characteristics of the product stored What should personnel performing external tank inspections be knowledgeable of 1 month The interval of external tank monitoring shall not exceed At least every 5 years or RCA/4N years An external inspection by an authorised inspector shall be conducted Owner/operator Who is responsible to ensure competency of personnel performing surveys Ensure the bottom is not leaking Gather thickness data Identify and evaluate settlement Why is inspection primarily required 10 years unless a tank has one or more safeguards as per table 6.1 and shall not exceed 20 years for tanks without RPB or 30 years for tanks with RPB The interval from initial service date until the first internal inspection shall not exceed Risk based inspection What can be used as an alternative to establishing the initial interval for inspection in accordance with API 653 API 653 Annex C Where can you find items for consideration when conducting in-service and out of service inspections All measurements taken Condition of parts inspected Records of all examinations and tests Corrosion rate and inspection intervals Unusual findings and recommendations What may be included as part of the inspection history For the lifetime of the tank For how long must records be maintained Dates of inspection Type of inspection Scope of inspection areas covered Full description of the tank Annex C type checklist Type of tests UT PT Corrosion rates Settlement surveys Recommendations What shall reports include as a minimum Owner/operator Who is responsible to review the inspection findings and carry out any recommendations It shall be subject to chemical analysis and mechanical tests including charpy v notch What should happen to plates for which adequate identification does not exist Checked for excessive corrosion and pitting What should be done if existing plates are to be used to reconstruct the tank It shall be deducted from the actual thickness (taken within 180 days) before calculating the maximum liquid level If corrosion allowance is required for reconstructed tank The authorised inspector or an engineer experienced in storage tank design All tank repairs must be authorised by An engineer experienced in tank design Tank alteration authorised can only be approved by? 12" or 12 times thickness of a replacement shell plate, whichever is greater What is the minimum dimension for a replacement shell plate Prior to welding the horizontal joints Vertical joints shall be welded Only when specified by the owner Are lapped patch shell repairs permitted Risk based inspection What can be used as an alternative to establishing the initial interval for inspection in accordance with API 653 API 653 Annex C Where can you find items for consideration when conducting in-service and out of service inspections All measurements taken Condition of parts inspected Records of all examinations and tests Corrosion rate and inspection intervals Unusual findings and recommendations What may be included as part of the inspection history For the lifetime of the tank For how long must records be maintained Dates of inspection Type of inspection Scope of inspection areas covered Full description of the tank Annex C type checklist Type of tests UT PT Corrosion rates Settlement surveys Recommendations What shall reports include as a minimum Owner/operator Who is responsible to review the inspection findings and carry out any recommendations It shall be subject to chemical analysis and mechanical tests including charpy v notch What should happen to plates for which adequate identification does not exist Checked for excessive corrosion and pitting What should be done if existing plates are to be used to reconstruct the tank It shall be deducted from the actual thickness (taken within 180 days) before calculating the maximum liquid level If corrosion allowance is required for reconstructed tank