API 653 Test | Questions with Complete Solutions (Verified Correct Answers)
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Course
Api 653
Institution
Api 653
An AST that has a diameter of 121ft and a height of 40ft (five 8ft courses).Its bottom shell
course has a thickness of 0.55" and a corrosion allowance of 0.1". The tank is built from ASTM
A283 gr C CS. It has a joint eff of 0.85. The tank is to be hydrostatically tested. Determine the
hydrostati...
API 653 Test | Questions with Complete Solutions
(Verified Correct Answers)
An AST that has a diameter of 121ft and a height of 40ft (five 8ft courses).Its bottom shell
course has a thickness of 0.55" and a corrosion allowance of 0.1". The tank is built from ASTM
A283 gr C CS. It has a joint eff of 0.85. The tank is to be hydrostatically tested. Determine the
hydrostatic test height. Round to nearest 100th of a ft. - ANSWER Ht = ((St*E*Tmin)/(2.6D)) + 1
= ((26,000*0.85*0.55)/(2.6*121)) +1
= (12155/314.6)+1 = 39.64ft
(4.3.3.2)
What is the risk of brittle facture failure in continued service after a tank has demosntrated the
ability to whitstand the combined effects of maximum liquid level (highest stress) and lowest
operating temperature without failing... great, minimal or average? - ANSWER Minimal (5.2.2)
Using Fig 5-2 of API 653, determine the lowest temperature that a tank constructed from CS of
unknown thoughness may be used if its maximum shell thickness is 0.75" - ANSWER 55F (Table
5-2)
The external condtion of storage tanks shall be monitored by close visual inspection from the
ground on a routine basis. The inspection can be done by owner/operator personnel, and can
be done by other Authorized inspector. The interval of such inspections shall not exceed how
many months? - ANSWER The interval of such inspections shall be consistent with conditions
at the particular site, but shall not exceed
one month. (6.3.1.2)
External ultrasonic thickness measurements of the shell, when used and when the corrosion
rate is not known, are taken at intervals not to exceed how many years? - ANSWER When the
corrosion rate is not known, the maximum interval shall be five years. (6.3.3.2)
, Who assures the quality and completeness of NDE results obtained during a formal
internal inspection of an in service AST? - ANSWER The authorized inspector (6.4.1.2)
The initial internal inspection interval for an AST shall not exceed how many years
(excluding RBI analysis)? - ANSWER 10 years (6.4.2.1)
Name the three types of records the owner/operator is required to keep for AST's -
ANSWER Construction records, inspection history, and repair/alteration history. (6.8.1)
If existing plates are to be used to reconstruct a tank, the plates shall be checked for what
conditions? - ANSWER They shall be checked for excessive corrosion and pitting (see Section
4 and Section 6). (7.3.4)
New weld joint details on a reconstructed tank shall meet the welding requiremnts of
what standard? - ANSWER Weld joint details shall meet the welding requirements of the
current applicable standard. (8.2.1)
Shell penetrations on reconstructed tanks shall be designed, detailed, welded and examined
to meet the requirements of what standard? - ANSWER Replacement and new penetrations
shall be designed, detailed, welded, and examined to meet the requirements of the current
applicable standard. (8.5.1)
All repair work on an AST must be authorized by whom before commencement of work? -
ANSWER By the authorized inspector or an engineer experienced in storage tank design (9.1.3)
The minimum dimension for a replacement shell plate is? - ANSWER 12 in. or 12 times the
thickness of the replacement
plate, whichever is greater. (9.2.2.1)
Are lap patch shell repairs permitted at all in API 653? - ANSWER Lapped patch shell repairs
are an acceptable form of repair for butt-welded, lap-welded, and riveted tank shells, under
the conditions outlined in 9.3.2, 9.3.3, and 9.3.4 (9.3.1)
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