API 575 Practice Questions All Answers Correct

API 575 Practice Questions All Answers Correct Who may use API RP 575? API RP 575 covers: Anyone desiring to use API RP 575 may do so. maintenance and inspection of atmosphere and low-pressure storage tanks. 2.5 The generic meaning for atmosperic pressure is up to but not exceeding _______ ibf/in2 gage pressure. The exterior surface of the tank bottom is known as the : bottom- side. When describing the amount of product the tank can hold, it is referred to as: shell capacity The pressure on the surface of a confined liquid caused by the vapors of that liquid is known as: vapor pressure A device that protects atmospheric storage tanks by maintaining the pressure difference between the tank vapor space and the outside atmosphere to just a few ounces per square inch is called : pressure vacuum vent. The most common type of atmospheric storage tank is the fixed : cone-roof tank. An older style of a floating roof has only a single deck without pontoons. It has no reserve buoyancy and is susceptible to sinking in service. This type of floating roof is known as a: pan type. Fixed cone-roof tanks may typically be up to _______ in diameter and _________in height. feet,64 feet Fixed cone - roof tank roofs ( diameter greater than 60 feet) are usually supported by: structural members The purpose of a geodesic dome is to: a 300 internal reduce product vapor loss or to eliminate the need to drain rainwater from the roof . an A tank with an annular- pontoon floating roof that has a geodesic dome is considered to be : internal floating roof tank. A low pressure storage tank operates between: 2.5 and 15 ibf/15 2 Reducing the incidence of leaking petroleum storage tanks is a priority goal for the : industry What condition poses an immediate hazard for a petroleum storage tank? petroleum holes in either the liquid or vapor space Atmospheric storage tanks are generally inspected to determine the: of deterioration The prime cause of deterioration of steel storage tanks is: corrosion physical condition and rate If you find cinders presents in the pad of a tank,which of the following would you suspect? possible source of corrosion if sulfur compounds and moisture are present. it is a During the inspection of a tank, a section of the bottom is removed .Several globs of clay are found in the pad. Which of the following would you suspect ? pitting corrosion could exist at each point of contract (electrolytic corrosion) A tank that is supported above grade on a ringwall has its bottom exposed to elements .As an inspector, what would you do to prevent possible bottom corrosion? The ringwall to tank area should be sealed to prevent moisture accumulation & corrosion . During an external inspection of a tank, the inspector notices that the soil is at or just above the grade line of the tank on the south side . What should he do? Require removal of soil & check the tank shell in the area for corrosion . An atmospheric storage tank in a humid environment is located adjacent to a series of heaters that burn high sulfur fuel gas.The prevailing winds cause the heater gases to contact the tank often.What type of problem would you suspect? Atmospheric corrosion-damage to coating . The occurrence of internal corrosion of a storage tank depends on the ________of the tank and the _______of the construction. contents ,materials Internal corrosion of an atmospheric storage tank in the vapor zone is usually caused by: hydrogen sulfide vapor,water vapor , or oxygen , or a combination of all three. Internal corrosion of an atmospheric storage tank in the area covered by stored liquid , the corrosion is most commonly caused by: acid salts, hydrogen sulfide , or other sulfur compounds. A horizontal AST is inspected externally . The tank is supported on three saddle type supports. Where would you suspect significant corrosion to occur ? In the saddle to tank interface Where is one of the most likely points and one of the potentially most critical points for a crack to occur in a large storage tank? The lower shell to sketch plate or annular plate weld. What type of failure is characterized by sudden loss of tank contents and extensive damage to equipment in the vicinity of the tank( little or no loss of metal thickness throughtout the tank)? Brittle Fracture Settlement of a tank due to compaction or movement of soil under the tank foundation can cause: mechanical deterioration What would be the expected problem encountered with a water draw off on a floating roof tank if an internal elbow or the internal pipe develops a leak ? The leak will allow product to escape or possibly water to leak into the product. If a pan type (single deck)floating roof has a plugged water draw off, what could be the most likely consequence ? The roof could sink during or after a rain. The purpose of similar service methodology for estimation of tank corrosion rates is: how long a tank in similar service can operate without leaking due to corrosion . What API document provides requirements for inspection frequency? API Std 653 establish The application of___________procedures to set inspection intervals may results in longer orshorter inspection intervals. risk based inspection Internal inspections should be scheduled, when possible, when the tank is out of service due to: operational reasons An AST was built. and put in service 1990.The minimum thickness of the bottom course was 0.35 inch. The bottom course was constructed using a 0.5 inch thick plates. The tank was not inspe