API 653 Questions with CORRECT Answers

API 653 Questions with CORRECT Answers

Question:
Widely scattered pits can be ignored if :
Answer:
no pit depth results in the remaining shell thickness being less than 50 % of Tmin


Question:
What is the longest initial internal inspection interval allowed by API 653 ?
Answer:
30 years ( 10 year base interval plus 10 years for RPB plus 10 years for SS bottom)


Question:
What is the longest initial internal inspection interval allowed by API 653 for an oil
storage tank without Safeguards ?
Answer:
10 years


Question:
What is the maximum internal inspection interval , if an RBI was not performed and no
other special condition is applicable ?
Answer:
10 years


Question:
What is the longest subsequent internal inspection interval allowed by API 653 for an oil
storage tank without RPBS and corrosion - rate is known ?
Answer:
20 years


Question:
What type of records is the owner / operator required to maintain ?
Answer:
Construction , inspection and repair / alteration records

, Question:
Who must write the external and internal reports ?
Answer:
Authorized Inspector


Question:
How long must external and internal inspection reports be kept ?
Answer:
Life of the tank


Question:
What type of weld joint is required for new shell joints in a reconstructed tank ?
Answer:
Butt joints with complete penetration and complete fusion


Question:
What is the thickness used in the design calculations based upon for a reconstructed
tank
Answer:
Thickness measurements taken 180 days prior to relocation


Question:
What code is used to determine the allowable stress for a reconstructed tank ?
Answer:
API 650


Question:
What is the maximum length allowed for averaging a corroded area
Answer:
40"


Question:
What equipment does API 653 cover ?
Answer:
Steel storage tanks built to API 650 and its predecessor API 12C