API 653 tank inspection, repair, alteration, and reconstruction Questions and Answers correct

API 653 tank inspection, repair, alteration, and reconstruction Questions and Answers correct What type of tanks does the standard apply? API 653 1.1.1 Steel storage tanks built to API 650 and its predecessor API 12C In case of a parent conflict between the requirements of API 650 and API 653 which standard Govern? API 653 1.1.2 API 653 What is meant by the term alteration? What are some examples of alterations? API 653 3.1 Anything that changes the physical dimensions Man way 12" nozzles What is the break over point? API 653 3.6 The area on the tank bottom where settlement begins What is meant by the term repair? What are some examples of repairs? API 653 3.15 Any work necessary to restore and maintain a tank to a condition suitable for safe operation What conditions would Necessitate the repair or replacement of a roof plate? API 653 4.2.1.2 Corrosion to a thickness of .09 in any 100 sq in area. Holes What possibility must be given particular attention when inspecting pipe columns supporting fixed roofs? API 653 4.2.2 Severe internal corrosion When a tank is to undergo a change in service what are five factors that should be considered when evaluating the roof and roof to shell junction? API 653 4.2.4 A) internal pressure B) external pressure C) elevated temp D) Low temp E) normal and emergency venting When determining controlling thickness in shell courses widely scattered pits may be ignored provided that two conditions are met. What are these two conditions? API 653 4.3.2.2 A) hope it being less than 1/2 the original shell thickness B) The sum of dimensions does not exceed 2 inches in a 8 inch length What are some typical forms of shell distortion? API 653 4.3.5.1 Out of round, buckled sides, flat spots, peeking and banding at weld joints Do temperature cracks in concrete seriously affect the strength of the concrete foundation? What can temperature cracks in concrete eventually result in? API 653 4.5.1.2 No Potential access points for moisture What are 12 historical causes of tank bottom leakage listed in this document? API 653 4.4.2 A) internal pitting B) corrosion of weld joints C) cracking weld joints D) stress on bottom plates from settlement and roof supports E) underside corrosion F) in adequate drainage G) lack of annular ring H) uneven settlement I) movement in roof supports J) Rock or gravel foundation pads K) non-homogenous fill under tank J) inadequate supported sumps What problems are indicated by distortion of anchor bolts and excessive cracking of the concrete in which they are in embedded? API 653 4.5.3 Serious foundation settlement Overpressure uplift condition Below what shell thickness is the potential for failure due to brittle fracture minimal? What can be done to gain assurance against brittle fracture? API 653 5.3.4, 5.3.5 .5 Increase the metal temp by heating the tank contents What are 12 factors that should be considered when determining inspection intervals for storage tanks? API 653 6.2.1 A) nature of stored product B) results of visual maintenance checks C) corrosion rates D) condition of previous inspections E) corrosion prevention systems F) methods and materials of construction and repair G) Location of tank H) risk of water or air pollution I) leak detection system J) change in operating modes fill and emptying K) jurisdictional requirements I) change in service How often should routine in-service inspections be conducted? API 653 6.3.1.2 Depends on condition of site not to exceed one month What can be determined by performing external ultrasonic thickness measurements of the tank shell? Can ultrasonic thickness measurements be conducted while the tank is in service? API 653 6.3.3.1 Corrosion rates, integrity of the shell Yes When Ultrasonic thickness measurements are used to access the tank condition what is the maximum interval for making the measurements when the corrosion rate is not known? API 653 6.3.3.2 5 years What are three main purposes of internal inspection? API 653 6.4.1.1 A) check bottom corrosion B) gather data from minimum shell and bottom assessment C) evaluate bottom settlement Once corrosion rate is determined the inspection intervals should be set to ensure that the Minimum bottom plate thickness at the time of the next inspection is not less than minimum thickness specified in table 4 Dash one of this document what is the minimum thickness specified when the tank bottom has no means for detection and containing a bottom leaks? The tank bottom foundation design includes means for Containing and detecting bottom leaks? The tank bottom has reinforced line in greater than .05 inches thick that has been applied in accordance with API 652? .10 .05 .05 Even when corrosion right information is available what is the maximum internal inspection interval allowed? API 653 6.4.2.1 20 years What should be the maximum internal inspection interval when corrosion rates are not known and similar service experience is not available? API 653 6.4.2.2 10 years What three types of records must be kept concerning above ground tanks? API 653 6.8 A) construction B) inspection C) repair and alteration What information Must General inspection reports include? API 653 6.9.2 A) dates B) type of inspection C) scope of inspection D) description of the tank E) List of components inspected and components found F) inspection methods and test used G) corrosion rate of bottom and shell H) settlement survey measurements and analysis I) recommendations per 6.9.3.1 J) name company API 653 number K) drawings L) photographs M) NDE reports What type of weld joint must be used when reconstructing a tank shell? API 653 8.2.2 Butt weld What should be the minimum dimension for a replacement shell plate? API 653 9.2.2.1 12 inches or 12 times the thickness of the plate which ever is greater What are acceptable shapes for replacement shell plates? API 653 9.2.2.1 A)Circular B)oblong C)square with rounded corners D)rectangular with rounded corners Prior to welding new vertical joints what must be done to existing horizontal welds that contact a new vertical joint? API 653 9.2.2.2 They must be cut at least 12 inches beyond the new vertical joints When installing a replacement shower plate which joints vertical or horizontal should be welded first? API 653 9.2.2.2 Vertical What type of joints should be used to install shell replacement plates API 653 9.2.3.1 But welds, except where lap wells are permitted How far from the edge of a well joint in the annual plate ring or sketch plate must the edge of any vertical weld attaching a replacement plate be? API 653 9.2.3.3 3" What is the maximum allowable vertical but joint misalignment when the plate thickness is 5/8 inches thick or less? API 653 10.4.4.1 1/16" What is the maximum out of plumness allowed for the top of the tank shell relevant to the bottom of the shell? API 653 10.5.2.1 1/100 tank height, max 5" What is the maximum peeking allowed when using a horizontal sweep board 36 inches long? API 653 10.5.4 1/2" At what interval master welders identification might be stamped along completed well joints API 653 11.2.2 Not exceeding 3 feet What are five non-destructive examination processes that can be applied to above ground tanks? API 653 section 12 A) Visual B) mag particle C) liquid penetrant D) ultrasonic E) radiographic What method of non-destructive examination should be used to detect shell plate lamination when adding a hot tap connection? API 653 section 12.1.2.1 Ultrasonic What type of non-destructive examination should be used to examine completed welds attaching a nozzle neck to tank shell? API 653 section 12.1.2.3 Mag particle Liquid penetrant What type of non-destructive examination should be used to examine completed repairs of butt welds? How much of the weld should be examined? API 653 section 12.1.3.2 Full length Radiographic or ultrasonic How should the first pass of the shell to bottom will be inspected? How long should this process take? API 653 section 12.1.6.1 Right angle vacuum box or diesel fuel Overnight What should be the minimum diagnostic length of a radiograph of a weld? API 653 section 12.2.1.7 6 inches What should be done if radiographs of the intersection of a new and old weld determined that the old weld is unacceptable by current standards? API 653 section 12.2.2 Existing welds evaluated to original standard What is the minimum duration of a hydrostatic test for a reconstructed tank? For a tank that has undergone major repairs? API 653 section 12.3.1.1 24 hour 24 hours What is required for new vertical and horizontal shell but welds? API 653 section 12.3.2.2.4 Complete penetration and fusion Where on the tank must air leak test be conducted? API 653 section 12.4 You or altered reinforcement plates Surveying for tanks element during a hydrostatic test what is the minimum number of measurement points? API 653 section 12.5.1.2 8 During storage tank operations how frequently should tank settlement measurements be conducted? API 653 section B.1.1 Based on service history What are three approaches that can be used to correct tank shell and bottom settlement? API 653 section B.1.3 A) repair bottom plates B) relieve perifery C) relieve tank bottom Turn on measurements of tank bottom settlement can be made in and out of service tank by measuring along the tank diameter. What should be the maximum spacing of those measurements? API 653 figure B-2 32' What is edge settlement? API 653 section B.2.3.1 Tank shell settles sharply When the thickness of replacement sheet plates is less than .5 inches what is the minimum allowable distance between an existing vertical well joint and the vertical weld on the replacement plate? API 653 figure 9-1 6" What may be use for the closure of holes card by and removal of existing shell openings or by the removal of severely corroded area? API 653 9.3.2 Lapped patch What two items must be entirely removed prior to installation of a repair plate? API 653 9.3.2.2 Nozzle necks and reinforcement plates How can lack of fusion in a weld be repaired? API 653 9.6.1 Gouging or grinding If a new tank bottom is installed above an existing bottom space between existing welds around penetrations and the new bottom to show well may not need a PI 650 requirements what are three ways of altering the penetrations to meet API 650? API 653 9.9.2-9.9.2.3 Trim the reinforcement plate remove plate and new plate added cut the shell and raise it What areas constitute the critical zone for repairs to tank bottoms? API 653 3.9 Chime area 3" from annular ring up shell What types of repairs are not allowed in the tank bottom critical zone? API 653 9.10.1.2 Patch plates What type of repairs are allowed in the tank bottom critical zone? API 653 9.10.1.2 Patch plates When replacing an entire tank bottom what type of material should be used as a cushion between the old and new bottoms? API 653 9.10.2.1.1 Sand, gravel, concrete