API 570 Piping Inspector Study Guide 2026, Exams of Engineering

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API 570 Piping Inspector Study Guide

“1 I I I I I I I I I I I I I I I I I I I I I I I I al API 570 Piping Inspector Study Guide 2026 Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld orientation? - CORRECT ANSWER lougiwudinel wek’ Per B31,3, how much RT is conducted on circumferential welds of a pipe in normal service? - CORRECT for welded pipe, the normal thickness of under-tolerance is? - CORRECT ANSWER ~.010 or 10 mils The corrosiveness of soils can be determined by measuring the soils: - GORREGHANSWER Resistivity when qualifying a weld procedure the essential variables must: - CORRECT ANSWER -be recorded on both the WPS & PQR In severe refinery services which type of pipe is normally used? - SORRECTANSWER! seamless pipe a pipe has a thickness designation of "40S", what does the "S” mean? - GORRECIANSIWER Srainless steel Generally socket-welded pipe is not used for nominal pipe sizes above: - SORRECIANSIWER2 inches A propane piping system should be classified as? - GORRECTANS WER Class 1 r I I I I I I I I I I I I I I I I I I I I I I I I L a | Ds ce eee ee ee es According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - CORRECT ANSWER -Blind flanges Preheat should never be substituted for PWHT ift - CORRECT ANSWER -the PWHT was used to prevent environmental cracking, During welding, non-esential variables: - G(ORREGIANSIVER! Must be recorded only on the WPS and must be followed by the welder, During a hydrotest, all joints should be: - CORRECT ANSWER -left uninsulated ASME/ANSI B16.5 requires flanges to be: - GORRECTANSWER marked with the class rating. Graphitization of carbon steels begins to occur when metal temperatures exceed: - SRREGIANSIWER- 800°F During pipe fabrication who has overall responsibility for compliance with the code? - CORRECT ANSWER -The owner/user Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed? - CORREGHUNSWR, The owes An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - GORRECHANSWER 3% Avwelder becomes unqualified when he has not welded in: - SORRECISNSIVERI-6 months bua ee ee ee ee eee ee ee ee ee eee eee eee “1 I I I I I I I I I I I I I I I I I I I I I I I I al what isthe interval for thickness measurements on a cass | piping system? - SORRECGRENISWVIRE lesser of 5 years or half life of the pipe According to B31.3, a welder's qualification records from a previous employer can: - CORRECT ANSWER - Be accepted if the inspector approves When welding together piping components of different thicknesses, the thicker part should be trimmed with «+ CORRUCTIANSIRERE0 degree spe. When performing soil-to air inspections on uncoated lines, it is recommended to excavate the soil: - When performing preheat prior to welding or PWHT, the preheat zone and/or PWHT must extend how far beyond the edge of the weld? - GORRECIANSWERE1 inch Flange bolts are unacceptable if the bole threads do not extend: - GORRECTANSWERY inside the nut within 1 thread of the nut face Carbon steel materials are most likely to be incorrectly substituted in: - CORRECT ANSWER -a chrome steel piping system. Per B31,3 how much of the fabrication should be visually examined for a pipe in severe cyclic service: - When calibrating a UT instrument, that has a delay line with single element unit, use: - CORRECT ANSWER At least 2 test blocks with thicknesses near the max and min to be examined, During pipe repairs, which welding discontinuity is always unacceptable? - GORRECTMNGWER Cracks and Inadequate fusion r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al What do you call a groove in the parent metal at the toe of a weld? - CORRECT ANSWER. undercut The RT procedure used for a pipe repair must conform to the requirements of - CORREGIPANSWERI- ASME Section 5 What is che minimum holding time for all pressure cests on piping? - GORREGIANSWER! 10 mins When a relief device or valve is removed for repair, the inspector should: - GORRECTANSWER inspect the inside of the inlet and oudlet piping where the valve was removed. since: - CORRECTANSWER directional changes Thickness measurements are suggested at pipe fittings generally create increased turbulence and corrosion. CORRECT ANSWER -bolts to crack and corrode Flange leaks in certain fluids can cause: CORRECTIANSWER: Csi Heat Tracing could cause cracking in carbon steel piping which is in: service CORRECTANSWERE hil groweh Excessive repairs to pump bearings may be a result of: Loose or broken anchor bolts at pipe supports are most easily detected by: testing A pneumatic pressure test is to be conducted on a Normal Service piping system. During pipe erection, how many of the joint assemblies should be examined? - CORRECT ANSWER -100 % r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al Maximum External Inspection interval for Class 1 & 2 Piping - CORRECT ANSWER-5 years Suggested interval - Close interval Potential Survey of buried pipe w/ poor CP - CORRECT ANSWER -5 years Suggested interval for evaluation of Soil corrosivity of buried pipe w/o CP - SORRECTANSIWER)S years Corrosion rates on existing piping systems shall be calculated on either a short-term or a long-term basis. How is the short-term corrosion rate calculated? - GORRECTANGIWER) Readings from the two most recent inspections shall be used. APT 570 paragraph 7.1.3 Maximum inspection inerval for clean/non fouling service PRD's - CORRECT ANSWER -10 years Maximum external inspection interval for Class 3 piping - CORRECT ANSWER -10 years Maximum thickness Inspection interval for Class 2 & 3 piping: - CORRECT ANSWER-The lesser of 10 years or half life of the pipe. When should temporary pipe repairs be replaced? - GORRECMANSWERI-Next opportunity When shall temporary leak sealing devices be removed and pipe repaired? - GORRECIANSWERI Nexc turnaround When performing a visual exam, the minimum angle of eye to part - CORRECT ANSWER 30” Hole size chat must be visible in RT when using Hole-type 1QI - GORREGHANSWER!-2T r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al Maximum allowed thickness on a WPS based on the plate thickness (T) of a PQR coupon - GORRECT ANSWER 21 Minimun light intensity when performing VT, MT, or PT exam - CORRECT ANSWER -100 foot-candles Lead letter used during RT to check for backscatter - CORRECT ANSWER -B Lead letter used during RT to indicate a film-side 1QI - SORREGTANSWER-F Two primary gamma ray radiation sources - GORRECTANSWER Iridium & Cobale Two most common CS pipe materials - GORREGIANSWERLA53 & A106 Maximum stress allowed during a pressure test - CORRECT ANSWER -90"% of SMYS (Specified Minimum Yield Strength) pH of hydro test water needed to reduce likelihood of MIC - SORRECIAINSIVER > 10 Maximum allowed SMYS (Specified Minimum Yield Strengeh) for pipe if fillet welded patch is installed - Typical external corrosion rate for dry rural environment - GORRECTANSWERL-<1 mpy Code to follow when performing an internal inspection on pipe - CORRECT ANSWER -API 510 r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al Materials subject to chloride stress corrosion cracking - CORRECT ANSWER -300 series Stainless Steel Which material must use low chloride hydro test water & must be died after hydro test? - CORRECT AINSWWERE 300 series Stainless Steel ‘What material is subject co polytheonic acid stress corrosion cracking? - G@RREGDANSWERI-Sensicized 300 SS Materials where preheat can be substituted for PWHT - @@RRECIANSWER!P1 & P3 Mill tolerance of seamless pipe - GORRECTIANS WERE” 12.596" Corrosion rates on existing piping systems shall be calculated on either a short-term or a long-term basis. How is the long-term corrosion rate calculated? - CORRECT ANSWER -Wall thicknesses from the most recent and initial (or nominal) inspections shall be used. API 570 paragraph 7.1.1 What does the "L" mean in Austenitic SS, like 304 L? - CORRECT ANSWER -Low Carbon What does the "H” mean in Austenitic SS, like 316 H? - GORRECTANSWER High Carbon The following is not a Ferritic Steel - CORRECT ANSWER -300 series Stainless Steel Low alloy stels can contain up co how much chrome? - SORREGHANSHTER! 9% The following is an Austenitic SS - CORRECT ANSWER -3 16 series Stainless Steel r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al The following is a Ferritic SS - CORRECT ANSWER -405 series Stainless Steel The following is a martensitic SS - CORRECT ANSWER-410 series Stainless Steel Nickel alloys are what % nickel? - GORRECTIANSWERI-30% True or False A Brittle Fracture grows very rapidly with minimum deformation prior to failure. - GORRECTANSWERI- True Which material is Least affected by Brittle Fracture? - GORREGTANSWERI-300 series Stainless Steel Resistance to Brittle Fracture is called: - GORRECTANSWER toughness What increases the likelihood of brittle fracture? - CORRICTANSWER large grain size & Thicker materials What test is used to determine a materials toughness? - GORRECTANSWER! Charpy Impact Test Most Brittle Fractures occur: - GORRECTANSWER! Below the impact transition temperature CORRECT ANSWER 19S" ASME Sec. VIII had few limitations concerning Brittle Fracture prior to: a4" thick 5 chrome vessel operates at 1200 psig and 900°F. When is the vessel lest likely to fail from Brittle Fracture? GORRECTANSWERL-During normal operation bua ee ee ee ee eee ee ee ee ee eee eee eee Ds ce eee ee ee es “1 I I I I I I I I I I I I I I I I I I I I I I I I al Minimum downstream limit of injection point circuic- GORRECIANSWERY lesser of Ist directional change +25 feet or 2nd directional change Change of an identical item, owing to corrosion + MAWP increased for the whole system is called? - GORREGTANSIER repair and re-rating True or False The minimum required pipe wall thickness, or retirement thickness, is based solely on pressure. - CORRECT ANSWER API 570 paragraph 7.3 Which dimension stay the same regardless of the wall scheduled thickness? - GORRECTANSWERL Ourside Diameter ASME code for valves - GORREGMANSWER!-B 16.34 Prefered inspection method for injection points - CORRECT ANSWER-RT and/or UT Important requirement of Material verification program - GORRECTANSWER Documented Roles and responsibilities PMI stands for - GORREGIANSWERI-P ositive Material Identification % of Material examiniation for high risk piping system with likely material mixup - CORRECT ANSWER - 100% r I I I I I I I I I I I I I I I I I I I I I I I I L a | Ds ce eee ee ee es What are the most common material nonconformances with serious consequences? - ({GRRECISANS WERI- Low Alloy steel pipe replaced by Carbon steel pipe Piping most involved in material mixup - GORRECTANSWER bypass piping, small diameter (<2NPS) piping, valves and bolts. Material most susceptible to brittle fracture - GORRECTANSWER Fercitics CS & Low Alloy SS Effect of T on Soil corrosion rate - SORREGIANSIVER! Corsosion Increases with Increase in T What indicates internal CO2 corrosion - GORRESHANSWERI-Smooth grooving of pipe wall Material with highest resistance co sulfidation - SORREGMANSWER 18/8 Ss Two main types of Environmental cracking - CORRECTANSIWER-Caustic stress corrosion cracking and Caustic embrittlement Modes of GMAW (Gas metal arc weld) - SORREGIANSIVERI-Globular, short circuit, and spray transfer. Welding process where filler rod is added by hand - CORRECT ANSWER-GTAW (Gas cungsten are welding) Advantage of GTAW (Gas cungsten arc welding) - SORREGIAINSWERI Best control of weld pooling Welding process which can be automated - GORRECIANSWER!-SAW (Submerged arc welding) bua ee ee ee ee eee ee ee ee ee eee eee eee “1 I I I I I I I I I I I I I I I I I I I I I I I I al what welding process cannot be qualified by radiography - GORREGHENSWERL GMAW (shore circuit mode) CORRECHANSWERE Vrs 24 Maximum flange size covered by B16.5 Piping stress analysis can identify the most highly stresses components in a piping system and predict thermal movement. Where can this information be used to enhance the inspection effort? - CORRECT ANSWER - To concentrate inspections at locations prone to fatigue and/or creep damage. API 570 paragraph 7.5 Guides, added to control vibration, must be checked to insure they do not: - GORRECTANSIWERL Restrict thermal expansion. API 570 paragraph 7.5 What type of records is the owner/user required to maintain according to API 570? - CORRECT ANSWER - Permanent and progressive records API 570 paragraph 7.6.1 Where should wall thickness on deadlegs be monitored by the inspector? - SORRECIANSWERI-This inspection should include both the stagnant end and the connection to an active line API 574 7.4.3 Ina hot tapping system, the high point area may corrode, Why is that? - GORRECTANSWER! Corrosion may take place at the high point area of deadlegs in hot piping systems due to convective currents set up in deadleg, API 574 7.4.3 r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al Corrosion under insulation (CUI) is a serious problem, What should be done to determine the possibility of this condition existing? GORRECTANSWER Inspect the integrity of the insulation system for conditions that could lead to CUL. API 574 7.4.4 What are the most common forms of corrosion under insulation? CORRECTMANSWER-Localized corrosion of carbon steel and chloride stress corrosion cracking of austenitic stainless steels. API 574 7.4.4 Corrosion under insulation is very aggressive where operating temperatures cause frequent condensation and re-evaporation of moisture. For carbon steel piping systems, what operating temperature range would be GORRECTANGWER Beween 10°F and 350°F considered most susceptible? APT 574 7.4.4.1 (e) Carbon steel piping which operates above what temperature intermittently should be inspected for CUI? - CORRECT ANSWER 35m"? API 574 7.4.4.1 (£) What operating temperature range would be considered most susceptible to chloride stress corrosion cracking in austenitic stainless steel piping? - GORRECIENSWER Between 120°F and 400°F APT 574 7.4.4.1 (h) API 574 discusses other areas of possible moisture ingress that may be causes by the actual inspection of the piping systems. Where would these areas be? - (ORRDCGIANSIVER! Locations where insulation plugs were removed to permit piping thickness measurements APT 574 7.4.4.2 r I I I I I I I I I I I I I I I I I I I I I I I I L “1 I I I I I I I I I I I I I I I I I I I I I I I I al Who must authorize any repair or alteration work, prior to commencement of the work? ANSWWERE The inspector APT 570 8.1.2 With regard to alteration work, who must the inspector consult with prior to giving authorization? CORRECT ANSWER -The piping engincer'ng API 570 8.1.2 Can the inspector give prior general authorization for limited or routine repair activities? - CORRECT ANSWER -Yes, provided the inspector is satisfied with the competency of the repair organization. APT 570 8.1.2 Who must approve all proposed methods of design, execution, materials, welding procedures, examination, and testing? - CORRECT ANSWER ~The inspector or the piping engineer API 570 8.1.3 Whose approval for on-stream welding is required? - CORRECT ANSWER -The owner/user API 570 8.1.3 Tn order to determine the cause and provide corrective action, welding repairs of cracks that occurred in- service should not be attempted without consultation with: - GORRECMANSWERI-The piping engineer APT 570 8.1.3 What are the restrictions to repairing longitudinal cracks with the full encirclement or box enclosure method? - PORRESTANSWER) The piping engineer must determine the crack will not propagate from under the sleeve. APT 570 8.1.4.1 r I I I I I I I I I I I I I I I I I I I I I I I I L