API 570 STUDY GUIDE QUESTIONS
WITH 100% CORRECT ANSWERS
What increases the likelihood of brittle fracture? - Answer-large grain size & Thicker
materials
What test is used to determine a materials toughness? - Answer-Charpy Impact Test
Most Brittle Fractures occur: - Answer-Below the impact transition temperature
ASME Sec. VIII had few limitations concerning Brittle Fracture prior to: - Answer-1987
a 4" thick 5 chrome vessel operates at 1200 psig and 900°F. When is the vessel lest
likely to fail from Brittle Fracture? - Answer-During normal operation
most brittle fractures appear as: - Answer-Cleavage
The calculations for maximum allowable working pressure (MAWP) for known materials
shall be as provided for in ASME B31.3 or the code to which the piping was designed
and fabricated (applicable code). What information is not required to be available and
comply with the principles of the applicable code? - Answer-The name of the original
manufacturer
API 570 paragraph 7.2
When the MAWP is recalculated for piping systems of unknown materials, what
information is used? - Answer-The lowest grade material and joint efficiency in the
applicable code.
API 570 paragraph 7.2
When recalculating MAWP of piping systems for continued use, what thickness is used?
- Answer-The actual thicknesses determined by inspection minus twice the estimated
corrosion loss before the date of the next inspection.
API 570 paragraph 7.2
According to B31.3, a welder's qualification records from a previous employer can: -
Answer-Be accepted if the inspector approves
What is the minimum holding time for all pressure tests on piping? - Answer-10 mins
When a relief device or valve is removed for repair, the inspector should: - Answer-
inspect the inside of the inlet and outlet piping where the valve was removed.
, Limits of soil to air area distance in air away from interface - Answer-6 inches
Distance to dig when inspectng for soil to air corrosion - Answer-6-12 inches
What is the limit of soil to air area distance in soil away from interface? - Answer-12
inches
Minimum length of buried pipe to expose when excavating for inspection - Answer-6-8
feet
Minimum downstream limit of injection point circuit - Answer-lesser of 1st directional
change +25 feet or 2nd directional change
Change of an identical item, owing to corrosion + MAWP increased for the whole
system is called? - Answer-repair and re-rating
True or False
The minimum required pipe wall thickness, or retirement thickness, is based solely on
pressure. - Answer-False
API 570 paragraph 7.3
Which dimension stay the same regardless of the wall scheduled thickness? - Answer-
Outside Diameter
ASME code for valves - Answer-B16.34
Prefered inspection method for injection points - Answer-RT and/or UT
Important requirement of Material verification program - Answer-Documented Roles and
responsibilities
PMI stands for - Answer-Positive Material Identification
% of Material examiniation for high risk piping system with likely material mixup -
Answer-100%
What are the most common material nonconformances with serious consequences? -
Answer-Low Alloy steel pipe replaced by Carbon steel pipe
Piping most involved in material mixup - Answer-bypass piping, small diameter (≤2NPS)
piping, valves and bolts.
Material most susceptible to brittle fracture - Answer-Ferritics CS & Low Alloy SS
Effect of T on Soil corrosion rate - Answer-Corrosion Increases with Increase in T
WITH 100% CORRECT ANSWERS
What increases the likelihood of brittle fracture? - Answer-large grain size & Thicker
materials
What test is used to determine a materials toughness? - Answer-Charpy Impact Test
Most Brittle Fractures occur: - Answer-Below the impact transition temperature
ASME Sec. VIII had few limitations concerning Brittle Fracture prior to: - Answer-1987
a 4" thick 5 chrome vessel operates at 1200 psig and 900°F. When is the vessel lest
likely to fail from Brittle Fracture? - Answer-During normal operation
most brittle fractures appear as: - Answer-Cleavage
The calculations for maximum allowable working pressure (MAWP) for known materials
shall be as provided for in ASME B31.3 or the code to which the piping was designed
and fabricated (applicable code). What information is not required to be available and
comply with the principles of the applicable code? - Answer-The name of the original
manufacturer
API 570 paragraph 7.2
When the MAWP is recalculated for piping systems of unknown materials, what
information is used? - Answer-The lowest grade material and joint efficiency in the
applicable code.
API 570 paragraph 7.2
When recalculating MAWP of piping systems for continued use, what thickness is used?
- Answer-The actual thicknesses determined by inspection minus twice the estimated
corrosion loss before the date of the next inspection.
API 570 paragraph 7.2
According to B31.3, a welder's qualification records from a previous employer can: -
Answer-Be accepted if the inspector approves
What is the minimum holding time for all pressure tests on piping? - Answer-10 mins
When a relief device or valve is removed for repair, the inspector should: - Answer-
inspect the inside of the inlet and outlet piping where the valve was removed.
, Limits of soil to air area distance in air away from interface - Answer-6 inches
Distance to dig when inspectng for soil to air corrosion - Answer-6-12 inches
What is the limit of soil to air area distance in soil away from interface? - Answer-12
inches
Minimum length of buried pipe to expose when excavating for inspection - Answer-6-8
feet
Minimum downstream limit of injection point circuit - Answer-lesser of 1st directional
change +25 feet or 2nd directional change
Change of an identical item, owing to corrosion + MAWP increased for the whole
system is called? - Answer-repair and re-rating
True or False
The minimum required pipe wall thickness, or retirement thickness, is based solely on
pressure. - Answer-False
API 570 paragraph 7.3
Which dimension stay the same regardless of the wall scheduled thickness? - Answer-
Outside Diameter
ASME code for valves - Answer-B16.34
Prefered inspection method for injection points - Answer-RT and/or UT
Important requirement of Material verification program - Answer-Documented Roles and
responsibilities
PMI stands for - Answer-Positive Material Identification
% of Material examiniation for high risk piping system with likely material mixup -
Answer-100%
What are the most common material nonconformances with serious consequences? -
Answer-Low Alloy steel pipe replaced by Carbon steel pipe
Piping most involved in material mixup - Answer-bypass piping, small diameter (≤2NPS)
piping, valves and bolts.
Material most susceptible to brittle fracture - Answer-Ferritics CS & Low Alloy SS
Effect of T on Soil corrosion rate - Answer-Corrosion Increases with Increase in T
