api 570 flash cards

5/28/2018 API 570 Flash Cards

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1. Pressure applied inside a pipe creates stress in the pipe wall. These stresses are higheston which weld orientation?

Ans: longitudinal weld

2. Per B31.3, how much RT is conducted on circumferential welds of a pipe in normalservice?

Ans: 10%

3. for welded pipe, the normal thickness of under-tolerance is?Ans: .010 or 10 mils

4. The corrosiveness of soils can be determined by measuring the soils:Ans: Resistivity

5. when qualifying a weld procedure the essential variables must:Ans: be recorded on both the WPS & PQR

6. In severe refinery services which type of pipe is normally used?Ans: seamless pipe

7. a pipe has a thickness designation of "40S". what does the "S" mean?Ans: Stainless steel

8. Generally socket-welded pipe is not used for nominal pipe sizes above:Ans: 2 inches

9. A propane piping system should be classified as?Ans: Class 1

10.According to ASME/ANSI B16.5 flanges from plate materials can only be used for:Ans: Blind flanges

11. Preheat should never be substituted for PWHT if:Ans: the PWHT was used to prevent environmental cracking.

12.During welding, non-esential variables:Ans: Must be recorded only on the WPS and must be followed by the welder.


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13.During a hydrotest, all joints should be:Ans: left uninsulated

14.ASME/ANSI B16.5 requires flanges to be:Ans: marked with the class rating.

15.Graphitization of carbon steels begins to occur when metal temperatures exceed:Ans: 800F

16.During pipe fabrication who has overall responsibility for compliance with the code?Ans: The owner/user

17.Who has the responsibility to determine the extent of PMI (Positive MaterialIdentification) performed?

Ans: The owner/user

18.An inservice process pipe should be classified as Class 1 when the % of H2S exceeds:Ans: 3%

19.A welder becomes unqualified when he has not welded in:Ans: 6 months

20.A PQR test coupon with a shell thickness of "T" can generally be used to qualify a wallthickness on the WPS up to.

Ans: 2T

21.A pressure test is always required:Ans: whenever the authorized inspector believes one is necessary

22.When can radiography not be used to qualify a welder?Ans: when using the GMAW process with the short circuit mode

23.Generally, raised face flanges should have a surface finish of:Ans: 125-250 micro- inches

24.During a direct visual exam of a pipe weld, the minimum light intensity should be:Ans: 100 footcandles


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25.Describe the 3G welding test position.Ans: Vertical groove Weld

26.Seal welding pipe threads:Ans: may be used to prevent leaks

27.Liquid thermal relief valves should be set at a pressure not higher than:Ans: 120 %

28.When fabricating pipe, unknown materials:Ans: Should never be used (except for door stops)

29.The material verification program specified by API 578 covers:Ans: only pressure containing components.

30.what is the interval for thickness measurements on a class 1 piping system?Ans: lesser of 5 years or half life of the pipe

31.According to B31.3, a welder's qualification records from a previous employer can:Ans: Be accepted if the inspector approves

32.When welding together piping components of different thicknesses, the thicker partshould be trimmed with a:

Ans: 30 degree taper.

33.When performing soil-to air inspections on uncoated lines, it is recommended toexcavate the soil:

Ans: 6-12 inches.

34.When performing preheat prior to welding or PWHT, the preheat zone and/or PWHTmust extend how far beyond the edge of the weld?

Ans: 1 inch

35.Flange bolts are unacceptable if the bolt threads do not extend:Ans: inside the nut within 1 thread of the nut face

36.Carbon steel materials are most likely to be incorrectly substituted in:


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Ans: a chrome steel piping system.

37.Per B31.3 how much of the fabrication should be visually examined for a pipe in severecyclic service:

Ans: 100 %

38.When calibrating a UT instrument, that has a delay line with single element unit, use:Ans: At least 2 test blocks with thicknesses near the max and min to be examined.

39.During pipe repairs, which welding discontinuity is always unacceptable?Ans: Cracks and Inadequate fusion

40.What do you call a groove in the parent metal at the toe of a weld?Ans: undercut

41.The RT procedure used for a pipe repair must conform to the requirements of:Ans: ASME Section 5

42.What is the minimum holding time for all pressure tests on piping?Ans: 10 mins

43.When a relief device or valve is removed for repair, the inspector should:Ans: inspect the inside of the inlet and outlet piping where the valve was removed.

44.Thickness measurements are suggested at pipe fittings since:Ans: directional changes generally create increased turbulence and corrosion.

45.Flange leaks in certain fluids can cause:Ans: bolts to crack and corrode

46.Heat Tracing could cause cracking in carbon steel piping which is in:Ans: Caustic service

47.Excessive repairs to pump bearings may be a result of:Ans: thermal growth

48.Loose or broken anchor bolts at pipe supports are most easily detected by:


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Ans: hammer testing

49.A pneumatic pressure test is to be conducted on a Normal Service piping system. Duringpipe erection, how many of the joint assemblies should be examined?

Ans: 100 %

50.During a pipe repair, preheat is substituted for the required PWHT. What is theminimum preheat temperature.

Ans: 300

51.Minimum time an examiner should be in a darkened area prior to using a black lightwhen performing MT & PT exam

Ans: 5 min

52.The corrosion rate for newly installed piping systems or for changes in service must beestablished. API 570 provides three methods of determination probable corrosion ratesfor these conditions.

Ans: API 570 paragraph 7.1.2

53.Minimum duration of hydro test to evaluation integrity of a burried pipeAns: 8hr

54.Maximum time before obtaining thickness readings when corrosion rate on new pipe isnot kmown (no other data available)

Ans: 3 months

55.Maximum time that a welder maintains qualifications for a welding process withoutusing that process

Ans: 6 months

56.Suggested interval for above-grade visual surveillance of burried pipeAns: 6 months

57.Maximum interval for a visual examiner's eye checkAns: 1 year

58.Length of time before an API 570 inspector must recertifyAns: 6 years


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59.Maximum thickness Inspection interval for injection pointAns: Lesser 3 years or Half life

60.Maximum External Inspection interval for Class 1 & 2 PipingAns: 5 years

61.Suggested interval - Close interval Potential Survey of buried pipe w/ poor CPAns: 5 years

62.Suggested interval for evaluation of Soil corrosivity of buried pipe w/o CPAns: 5 years

63.Corrosion rates on existing piping systems shall be calculated on either a short-term or along-term basis. How is the short-term corrosion rate calculated?

Ans: Readings from the two most recent inspections shall be used. API 570 paragraph 7.1.3

64.Maximum inspection inerval for clean/non fouling service PRD'sAns: 10 years

65.Maximum external inspection interval for Class 3 pipingAns: 10 years

66.Maximum thickness Inspection interval for Class 2 & 3 piping:Ans: The lesser of 10 years or half life of the pipe.

67.When should temporary pipe repairs be replaced?Ans: Next opportunity

68.When shall temporary leak sealing devices be removed and pipe repaired?Ans: Next turnaround

69.When performing a visual exam, the minimum angle of eye to partAns: 30

70.Hole size that must be visible in RT when using Hole-type IQIAns: 2T


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71.Maximum allowed thickness on a WPS based on the plate thickness (T) of a PQR couponAns: 2T

72.Minimun light intensity when performing VT, MT, or PT examAns: 100 foot-candles

73.Lead letter used during RT to check for backscatterAns: B

74.Lead letter used during RT to indicate a film-side IQIAns: F

75.Two primary gamma ray radiation sourcesAns: Iridium & Cobalt

76.Two most common CS pipe materialsAns: A53 & A106

77.Maximum stress allowed during a pressure testAns: 90% of SMYS (Specified Minimum Yield Strength)

78. pH of hydro test water needed to reduce likelihood of MIC

Ans: >10

79.Maximum allowed SMYS (Specified Minimum Yield Strength) for pipe if fillet weldedpatch is installed

Ans: 40,000 psi

80.Typical external corrosion rate for dry rural environmentAns:


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83.Code for FFS (Fitness for Service)Ans: API 579

84.Code for RBI (Risk Based Inspection)Ans: API 580

85.Code for Valve Inspection and testingAns: API 598

86.Code for Cathodic ProtectionAns: API 651

87.Code for Welding on In-Service equipment containing Flammables (hot tapping)Ans: API 2201

88.Code for NDE procedures guidelinesAns: ASME Section 5

89.Design code for fabrication of piping relief devicesAns: ASME section VIII

90.Code for Welder qualificationAns: ASME Section IX

91.Code for Weld procedure qualificationAns: ASME Section IX

92.NDE personnel qualificationAns: ASNT SNT-TC-1A

93.Materials subject to temper-embrittlementAns: Low Alloy Chromes

94. Materials subject to chloride stress corrosion cracking

Ans: 300 series Stainless Steel

95.Which material must use low chloride hydro test water & must be died after hydro test?


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Ans: 300 series Stainless Steel

96.What material is subject to polytheonic acid stress corrosion cracking?Ans: Sensitized 300 SS

97.Materials where preheat can be substituted for PWHTAns: P1 & P3

98.Mill tolerance of seamless pipeAns: "-12.5%"

99.Corrosion rates on existing piping systems shall be calculated on either a short-term or along-term basis. How is the long-term corrosion rate calculated?

Ans: Wall thicknesses from the most recent and initial (or nominal) inspections shall beused. API 570 paragraph 7.1.1

100. What does the "L" mean in Austenitic SS, like 304 L?Ans: Low Carbon

101. What does the "H" mean in Austenitic SS, like 316 H?Ans: High Carbon

102. The following is not a Ferritic SteelAns: 300 series Stainless Steel

103. Low alloy steels can contain up to how much chrome?Ans: 9%

104. The following is an Austenitic SSAns: 316 series Stainless Steel

105. The following is a Ferritic SSAns: 405 series Stainless Steel

106. The following is a martensitic SSAns: 410 series Stainless Steel

107. Nickel alloys are what % nickel?


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Ans: 30%

True or False

108. A Brittle Fracture grows very rapidly with minimum deformation prior to failure.Ans: True

109. Which material is Least affected by Brittle Fracture?Ans: 300 series Stainless Steel

110. Resistance to Brittle Fracture is called:Ans: toughness

111.What increases the likelihood of brittle fracture?Ans: large grain size & Thicker materials

112. What test is used to determine a materials toughness?Ans: Charpy Impact Test

113. Most Brittle Fractures occur:Ans: Below the impact transition temperature

114. ASME Sec. VIII had few limitations concerning Brittle Fracture prior to:Ans: 1987

115. a 4" thick 5 chrome vessel operates at 1200 psig and 900F. When is the vessel lestlikely to fail from Brittle Fracture?

Ans: During normal operation

116. most brittle fractures appear as:Ans: Cleavage

117. The calculations for maximum allowable working pressure (MAWP) for knownmaterials shall be as provided for in ASME B31.3 or the code to which the piping wasdesigned and fabricated (applicable code). What information is not required to beavailable and comply with the principles of the applicable code?

Ans: The name of the original manufacturer; API 570 paragraph 7.2


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118. When the MAWP is recalculated for piping systems of unknown materials, whatinformation is used?

Ans: The lowest grade material and joint efficiency in the applicable code. API 570paragraph 7.2

119. When recalculating MAWP of piping systems for continued use, what thickness isused?

Ans: The actual thicknesses determined by inspection minus twice the estimated corrosionloss before the date of the next inspection. API 570 paragraph 7.2

120. Limits of soil to air area distance in air away from interfaceAns: 6 inches

121. Distance to dig when inspectng for soil to air corrosionAns: 6-12 inches

122. What is the limit of soil to air area distance in soil away from interface?Ans: 12 inches

123. Minimum length of buried pipe to expose when excavating for inspectionAns: 6-8 feet

124. Minimum downstream limit of injection point circuitAns: lesser of 1st directional change +25 feet or 2nd directional change

125. Change of an identical item, owing to corrosion + MAWP increased for the wholesystem is called?

Ans: repair and re-rating

True or False

126. The minimum required pipe wall thickness, or retirement thickness, is based solelyon pressure.

Ans: False, API 570 paragraph 7.3

127. Which dimension stay the same regardless of the wall scheduled thickness?Ans: Outside Diameter

128. ASME code for valves


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Ans: B16.34

129. Prefered inspection method for injection pointsAns: RT and/or UT

130. Important requirement of Material verification programAns: Documented Roles and responsibilities

131. PMI stands forAns: Positive Material Identification

132. % of Material examiniation for high risk piping system with likely material mixupAns: 100%

133. What are the most common material nonconformances with serious consequences?Ans: Low Alloy steel pipe replaced by Carbon steel pipe

134. Piping most involved in material mixupAns:bypass piping, small diameter (2NPS) piping, valves and bolts.

135. Material most susceptible to brittle fractureAns: Ferritics CS & Low Alloy SS

136. Effect of T on Soil corrosion rateAns: Corrosion Increases with Increase in T

137. What indicates internal CO2 corrosionAns: Smooth grooving of pipe wall

138. Material with highest resistance to sulfidationAns: 18/8 SS

139. Two main types of Environmental crackingAns: Caustic stress corrosion cracking and Caustic embrittlement

140. Modes of GMAW (Gas metal arc weld)Ans: Globular, short circuit, and spray transfer.


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141. Welding process where filler rod is added by handAns: GTAW (Gas tungsten arc welding)

142. Advantage of GTAW (Gas tungsten arc welding)Ans: Best control of weld pooling

143. Welding process which can be automatedAns: SAW (Submerged arc welding)

144. Welding process with no creation of slagAns: GMAW(Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding)

145. Flux type for low hydrogen use with SAW (Submerged arc welding)Ans: Agglomerated

146. Electrode for SMAW (Shielded metal arc weld) for low hydrogen applicationAns: Basic

147. What type of weld for flush insert patches can be used in corroded areas?Ans: penetration groove weld

148. To evaluate the effects of fire damage, FFS evaluation should be performed inaccordance with:

Ans: API 579, section 11

149. What should be done when unexpected movement of a piping system is observed?Ans: The inspector should discuss these observations with the piping engineer and evaluatethe need for conducting a piping stress analysis, API 570 paragraph 7.5

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