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api 570 re-do > api 570 q/a > Flashcards

api 570 q/a Flashcards

2
Q
  1. API 570 covers inspection, repair, alteration, and rerating procedures for metallic piping systems that
A

have been in-service

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3
Q

API 570 was developed for the petroleum refining and chemical process industries.it may be used?

A

It may be used, where practical, for any piping system.

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4
Q

API 570 ________ be used as a substitute for the original construction requirements governing a pipingsystem before it is placed in-service.

A

shall not

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5
Q

API 570 applies to piping systems for process fluids, hydrocarbons, and similar flammable or toxic fluidservices. Which of the following services is not specifically applicable?

A

Water, steam condensate, boiler feed water

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6
Q

Some of the classes of piping systems that are excluded or optional for coverage under API 570 are listedbelow. Which one is a mandatory included class?

A

Catalyst lines

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7
Q

The _________ shall be responsible to the owner-user for determining that the requirements of API 570 forinspection, examination, and testing are met

A

Inspector

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8
Q

Who is responsible for the control of piping system inspection programs, inspection frequencies, andmaintenance of piping?

A

Owner-User.

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9
Q

An Authorized Piping Inspector shall have the following qualifications. Pick the one that does not belong inthis list

A

Four years of experience inspecting in-service piping systems

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10
Q

Risk Based Inspections include which of the following

A

Likelihood assessment.b. Consequence analysis.c. Operating and Inspection histories

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11
Q

An RBI assessment can be used to alter the inspection strategy provided

A

The degradation methods are identified.b. The RBI is fully documented

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12
Q

Which one of the following is not a specific type or an area of deterioration?

A

Rectifier performance

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13
Q

Injection points subject to accelerated or localized corrosion may be treated as ________.

A

separate inspection circuits

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14
Q

The recommended upstream limit of inspection of an injection point is a minimum of:

A

12 inches or 3 pipe diameters whichever is greater

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15
Q

The recommended downstream limit of inspection of an injection point is a minimum of:

A

second change in flow direction past the injection point, or 25 feet beyond the first change in flow directionwhichever is less

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16
Q

Select thickness measurement locations (TMLs) within injection point circuits subject to localized corrosionaccording to the following guidelines.

A

Establish TMLs on appropriate fittings within the injection point circuit,Establish TMLs on the pipe wall at the location of expected pipe wall impingement or injected fluid.d. Establish TMLs at both the upstream and downstream limits of the injection point circuit.

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17
Q

What are the preferred methods of inspecting injection points?

A

Radiography and/or ultrasonics

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18
Q

During periodic scheduled inspections, more extensive inspection should be applied to an area beginning__________ upstream of the injection nozzle and continuing for at least __________ pipe diametersdownstream of the injection point.

A

12 inches, 10

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19
Q
  1. Why should deadlegs in piping be inspected?
A

The corrosion rate in deadlegs can vary significantly from adjacent active piping.

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20
Q

Both the stagnant end and the connection to an active line of a deadleg should be monitored. In a hot pipingsystem, why does the high point of a deadleg corrode and need to be inspected?

A

corrosion occurs due to convective currents set up in the deadleg.

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21
Q

What is the best thing to do with deadlegs that are no longer in service?

A

Remove them.

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22
Q

What are the most common forms of corrosion under insulation (CUI).

A

localized corrosion of carbon steel and chloride stress corrosion cracking of austenitic stainless steel.

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23
Q

What climatic area may require a very active program for corrosion under insulation?

A

Warmer, marine locations.

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24
Q

Certain areas and types of piping systems are potentially more susceptible to corrosion under insulation.Which of the items listed is not susceptible to CUI?

A

Carbon steel piping systems, operating between 250 degrees F and 600 degrees F.

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25
Q

What location is subject to corrosion under insulation and inspection contributes to it.

A

Locations where insulation plugs have been removed to permit piping thickness measurements

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26
Q

Soil-to-air (S/A) interfaces for buried piping are a location where localized corrosion may take place. If theburied part is excavated for inspection, how deep should the excavation be to determine if there is hiddendamage?

A

6 to 12 inches

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27
Q

At concrete-to-air and asphalt-to-air interfaces of buried piping without cathodic protection, the inspectorshould look for evidence that the caulking or seal at the interface has deteriorated and allowed moistureingress. If such a condition exists on piping systems over ______ years old, it may be necessary to inspectfor corrosion beneath the surface before resealing the joint

A

10

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28
Q

An example of service-specific and localized corrosion is

A

Unanticipated acid or caustic carryover from processes into non-alloyed piping.

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29
Q

Erosion can be defined as?

A

removal of surface material by action of numerous impacts of solid or liquid particles.

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30
Q

A combination of corrosion and erosion results in significantly greater metal loss than can be expected fromcorrosion or erosion alone. This type of loss occurs at:

A

high-velocity and high-turbulence areas

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31
Q

Environmental cracking of austenitic stainless steels is caused many times by

A

exposure to chlorides from salt water, wash-up water, etc.

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32
Q

When the inspector suspects or is advised that specific piping circuits may be susceptible to environmentalcracking the inspector should

A

schedule supplemental inspections

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33
Q

If environmental cracking is detected during internal inspection of pressure vessels, what should theInspector do?

A

The Inspector should designate appropriate piping spools upstream and downstream of the vessel to beinspected if piping is susceptible to environmental cracking.

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34
Q

If external or internal coatings or refractory liners on a piping circuit are in good condition, what should aninspector do?

A

After inspection, if any separation, breaks, holes or blisters are found, it may be necessary to removeportions of the lining to determine the condition under it.

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35
Q

What course of action should be followed if a coating of coke is found on the interior of a large pipe off areactor on a Fluid Catalytic Cracking Unit

A

Determine whether such deposits have active corrosion beneath them. If corrosion is present, thoroughinspection in selected areas may be required.

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36
Q

Fatigue cracking of piping systems may result from:

A

excessive cyclic stresses that are often well below the static yield strength of the material.

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37
Q

Where can fatigue cracking typically be first detected?

A

At points of high-stress intensification such as branch connections.

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38
Q

What are the preferred NDE methods for detecting fatigue cracking.

A

Liquid penetrant testing, magnetic particle testing and/or possibly acoustic emission testing.

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39
Q

Creep is dependent on:

A

time, temperature, and stress

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40
Q

An example of where creep cracking has been experienced in the industry is in the problems experiencedwith cracking of 1.25% Chrome steels operating at temperatures above _________ degrees F.

A

900

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41
Q

Brittle fracture can occur in carbon, low-alloy, and other ferritic steels at or below _______ temperatures

A

ambient

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42
Q

Water and aqueous solutions in piping systems may freeze and cause failure because of the

A

expansion of these materials

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43
Q

Internal visual inspections are __________ on piping unless it is a large diameter transfer line, duct, catalystline or other large diameter piping system.

A

not normally performed

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44
Q

Name an additional opportunity for a normal non-destructive internal inspection of piping.

A

When piping flanges are disconnected

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45
Q

Why is thickness measurement inspection performed?

A

To determine the internal condition and remaining thickness of the piping components.

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46
Q

Who performs a thickness measurement inspection?

A

The Inspector or examiner

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47
Q

When corrosion product buildup is noted during an external visual inspection at a pipe support contact arealifting off such supports may be required for inspection. When doing this, care should be:

A

exercised if the piping is in-service.

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48
Q

Qualified operating or maintenance personnel also may conduct external visual inspections, when:

A

acceptable to the inspector.

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49
Q

Who would normally report vibrating or swaying piping to engineering or inspection personnel?

A

Operating personnel

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50
Q

Thermography is used to check for:

A

hot spots in refractory lined piping systems.

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51
Q

Thickness measurement locations (TMLs) are specific ________ along the piping circuit where inspections are to be made

A

areas

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52
Q

The minimum thickness at each TML can be located by:

A

ultrasonic scanning or radiography

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53
Q

Where appropriate, thickness measurements should include measurements at each of _________ on pipe and fittings

A

four quadrants

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54
Q

Where should special attention be placed when taking thickness measurements of an elbow?

A

The inside and outside radius

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55
Q

TMLs should be marked on inspection drawings and __________________ to allow repetitive measurements

A

on the piping system

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56
Q

What is taken into account by an experienced inspector when selecting TML’s?

A

The patterns of corrosion that would be expected.

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57
Q

In theory, a piping circuit subject to perfectly uniform corrosion could be adequately monitored with ______TML/s

A

1

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58
Q

More TML’s should be selected for piping systems with any of the following characteristics:

A

More complexity in terms of fittings, branches, deadlegs, injection points, etc.

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59
Q

Fewer TML’s can be selected for piping systems with any of the following characteristics:

A

Long, straight-run piping systems.

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60
Q

TML’s can be eliminated for piping systems with the following characteristics:

A

Extremely low potential for creating a safety or environmental emergency in the event of a leak

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61
Q

What is usually the most accurate means for obtaining thickness measurements on installed pipe larger than nps 1

A

UT

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62
Q

What thickness measuring technique does not require the removal of some external piping insulation

A

RT

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63
Q

When ultrasonic thickness measurements are taken above ________ degrees F., instruments couplants,and procedures should be used that will result in accurate measurements at the higher temperature

A

150

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64
Q

Typical digital thickness gages may have trouble measuring thicknesses less than ____ inches

A

0.1250

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65
Q

When pressure testing of piping systems are conducted they shall be performed in accordance with the requirements of?

A

ASME B31.3.

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66
Q

If a lower pressure test (lower than prescribed by code) is used only for tightness of piping systems, the_______ may designate the pressure.

A

owner-user

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67
Q

The preferred medium for a pressure test is ______.

A

water

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68
Q

If a non-toxic hydrocarbon (flammable) is used as the test medium, the liquid flash point shall be at least______ degrees F. or greater.

A

120

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69
Q

Piping fabricated of or having components of 300 series stainless steel should be tested with _________.

A

steam condensate

70
Q

For sensitized austenitic stainless steel piping subject to polythionic stress corrosion cracking, considerationshould be given to using _________ for pressure testing

A

an alkaline-water solution

71
Q

When a pipe requires post weld heat treatment, when should the pressure test be performed

A

After any heat treatment.

72
Q

During a pressure test, where the test pressure will exceed the set pressure of the safety relief valve orvalves on a piping system the safety relief valve or valves should be ______________ when carrying out the test

A

removed or blanked

73
Q

If block valves are used to isolate a piping system for a pressure test, what precaution should be taken?

A

Do not exceed the permissible seat pressure of the valve.

74
Q

Name a part of a piping system that thickness measurements are not normally routinely taken.

A

valves

75
Q

If environmental cracking is found during in-service inspection of welds, who should conduct the untrasonicshear wave examination, if required?

A

Industry-qualified UT Examiner (after 2003

76
Q

If an Inspector finds an imperfection in an original fabrication weld and analysis is required to assess theimpact of the weld quality on piping integrity, which of the following may perform the analysis?

A

An API 570 Inspector, a CWI Inspector, a Piping Engineer

77
Q

According to API 570, some welds in a piping system that has been subjected to radiography according toASME B31.3:

A

will not meet random radiograph requirements, but will still perform satisfactorily in-service after beinghydrotested

78
Q

How should fasteners and gaskets be examined to determine whether they meet the material specifications.

A

A representative sample of the fasteners and gaskets should be checked to see if their markings arecorrect according to ASME and ASTM standards.

79
Q

When checking flange and valve bonnet bolts for corrosion, what type of NDT is usually used?

A

VT

80
Q

What course of action is called for when an inspector finds a flange joint that has been clamped andpumped with sealant?

A

Check for leakage at the bolts; if repumping is contemplated, affected fasteners should be renewed.

81
Q
  1. All process piping systems must be categorized into different classes. On what are the classificationsselection based?
A

Potential safety and environmental effects should a leak occur.

82
Q
  1. (1). Inspection strategy based on likelihood and consequence of failure is called:
A

RBI

83
Q
  1. (2). An RBI assessment can be used to _______________ the inspection interval limits in Table 1 ofAPI 570 or the extent of the inspection conducted.
A

a. increaseb. decrease

84
Q
  1. (3). When an RBI assessment is used to increase or decrease inspection intervals, the assessmentshall be conducted on Class 1 systems at a maximum interval of _________ years.
A

5

85
Q

Of the three classification of piping systems, which includes the majority of unit process and selected off-sitepiping?

A

Class 2

86
Q

Class 3 piping is described as being in services:

A

that are flammable but do not significantly vaporize when they leak and are not located in high-activityareas.

87
Q

Who establishes inspection interval for thickness measurements, external visual inspections and for internaland supplemental inspections?

A

Owner-user or the Inspector.

88
Q

Thickness measurement inspection should be scheduled based on the calculation of not more than:

A

one half the remaining life determined from corrosion rates or the maximum interval allowed by API 570 inTable 1, whichever is shorter.

89
Q

For External inspections for potential corrosion under insulation (CUI) on Class 1 systems, the examinationshould include at least _____ percent of all suspect areas and _____ percent of all areas of damagedinsulation

A

50, 75

90
Q

Piping systems that are known to have a remaining life of over ______ years or that are protected againstexternal corrosion need not have insulation removed for the periodic external inspection

A

10

91
Q

For Class 3 piping systems, the examination for corrosion under insulation (CUI) should include at least_____ percent of all suspect areas.

A

10

92
Q

Small bore piping (SBP) that is Class 1 shall be inspected:

A

to the same requirements as primary process piping

93
Q

Inspection of small bore piping (SBP) that is secondary and auxiliary (associated with instruments andmachinery) is:

A

optional.

94
Q

If an inspector finds threaded small bore piping (SBP) associated with machinery and subject to fatiguedamage, he should:

A

plan periodically to assess it and consider it for possible renewal with a thicker wall or upgrade it to weldedcomponents.

95
Q

You have a new piping system that has just been installed. It is completely new an no information exists toestablish a corrosion rate. Also, information is not available on a similar system. You decide to put thesystem in service and NDT it later to determine the corrosion rate. How long do you allow the system to stayin service before you take your first thickness readings?

A

3 months

96
Q

After an inspection interval is completed and if calculations indicate that an inaccurate rate of corrosion hasbeen assumed in a piping system, how do you determine the corrosion rate for the next inspection period?

A

The corrosion rate shall be adjusted to agree with the actual rate found.

97
Q

If a piping system is made up of unknown materials and computations must be made to determine theminimum thickness of the pipe, what can the inspector or the piping engineer do to establish the minimumthickness?

A

The lowest grade material and joint efficiency in the applicable code may be assumed for calculations

98
Q

A piping engineer is designing a piping service with high potential consequences if a failure occurs, i.e., a350 psi natural gas line adjacent to a high density population area. What should he consider doing toprovide for unanticipated situations?

A

Increase the required minimum thickness.

99
Q

When evaluating locally thinned areas, the provisions of RP 579 Section ______ should be followed.

A

5

100
Q

An Inspector finds a thin area in a fabricated 24” diameter pipe. The thin area includes a longitudinal weldin the pipe and is 10 feet long and 2 foot circumferentially. Calculations show that with 0.85 joint factor,the pipe must be repaired, renewed, etc. or the pressure in the pipe must be lowered. The owner doesnot want do any hot work on the pipe and he does not wish to lower the pressure. What other coursecould be followed, per API 570?

A

Conduct an FFS per RP 579.

101
Q

Piping stress analysis is done during the system’s original design. How can the inspector make use ofstress analysis information?

A

It can be used to concentrate inspection efforts at locations most prone to fatigue orcreep damage, and to solve vibration problems

102
Q

You are inspecting a piping system. You find a significant loss of material (a major increase of corrosionrate) in gas oil piping (used as reboiler oil, temperature 500 degrees F.) on an Fluid Catalytic CrackingUnit. What is the best course of action for you to take?

A

It shall be reported to the owner-user for appropriate action.

103
Q

The ___________ shall maintain appropriate permanent and progressive records of each piping systemcovered by API 570.

A

owner-user

104
Q

When making repairs and alterations to piping systems the principles of ________ or the code to which thepiping system was built shall be followed.

A

ASME B31.3

105
Q

Repair and alteration work must be done by a repair organization as defined in API 570 and must beauthorized by the _________ prior to its commencement.

A

inspector

106
Q

Authorization for alteration work to a piping system may be given by the inspector after:

A

consultation with, and approval by a piping engineer.

107
Q

A repair procedure involving welding requires that the root pass of the weld be inspected before continuingthe weld. A “hold” on the repair is required at this point. Who designates this “hold”?

A

An API 570 inspector.

108
Q

What type of repairs and procedures may the inspector give prior general authorization to continue(provided the inspector is satisfied with the competency or the repair organization?

A

limited or routine repairs and procedures

109
Q

Who approves all proposed methods of design, execution, materials, welding procedures, examination,and testing of in-service piping?

A

The inspector or the piping engineer, as appropriate

110
Q

Who must give approval for any on-stream welding?

A

owner-user.

111
Q

An inspector finds a crack in the parent metal of a pipe adjacent to a support lug. The pipe was beinginspected after a 5 year run. Before repairing the he should:

A

Consult with the piping engineer to identify and correct the cause of the crack.

112
Q

A full encirclement welded split sleeve designed by a piping engineer may be applied over a damaged orcorroded area of a pipe. This is considered a temporary repair. When should a permanent repair be made?

A

A permanent repair must be made at the next available maintenance opportunity

113
Q

What type of defect, corrosion, pitting and/or discontinuity should not be repaired by a full encirclementwelded split sleeve?

A

A longitudinal crack.

114
Q

If a repair area is localized (for example, pitting or pin-holes) and the specified minimum yield strength(SMYS) of the pipe is not more than ___________ psi, a temporary repair may be made by fillet welding aproperly designed plate patch over the pitted area.

A

40,000 psi

115
Q

Insert patches (flush patches may be used to repair damaged or corroded areas of pipe if severalrequirements are met. One of these is that an insert patch (flush patch) may be of any shape but it shallhave rounded corners with ______ minimum radii.

A

1’’

116
Q

An inspector finds a pin-hole leak in a weld during an on-stream inspection of a piping system. Apermissible temporary repair is:

A

the installation of a properly designed and fabricated bolted leak clamp.

117
Q

Temporary leak sealing and leak dissipating devices shall be removed and the pipe restored to originalintegrity:

A

at a turnaround or other appropriate time.

118
Q

Any welding conducted on piping components in operation must be done in accordance with:

A

API Publication 2201

119
Q

All repair and alteration welding to piping systems shall be done in accordance with the:

A

principles of ASME B31.3 or the code to which it was built.

120
Q

Welders and welding procedures used in making piping repairs, etc. shall be qualified in accordance with:

A

ASME B31.3 or the code to which the piping was built.

121
Q

The repair organization responsible for welding shall maintain records of welding procedures and welderperformance qualifications. These records shall be available to the inspector:

A

before the start of welding.

122
Q

Preheating to not less than ________ degrees F. may be considered as an alternative to post weld heattreatment for alterations or repairs of P-1 piping initially post weld heat treated as a code requirement (maynot be used if the piping was post weld heat treated due to environmental cracking prevention).

A

300

123
Q

Piping butt joints shall be:

A

full-penetration groove welds.

124
Q

When should piping components that need repair be replaced?

A

When repair is likely to be inadequate

125
Q

Fillet welded patches (lap patches) shall be designed by:

A

the piping engineer.

126
Q

Fillet welded lap patches (overlay patches) shall have:

A

rounded corners

127
Q

Materials used in making welding repairs or alterations _______ be of known weldable quality

A

shall

128
Q

Acceptance of a welded repair or alteration shall include _______ in accordance with the applicable codeand the owner-user’s specification, unless other wise specified in API 570

A

Nondestructive examination

129
Q

After welding is completed on a repair or alteration, __________________ in accordance with API 570shall be performed if practical and deemed necessary by the inspector

A

a pressure test

130
Q

When are pressure tests normally required?

A

Pressure tests are normally required after alterations and major repairs

131
Q

When a pressure test is not necessary or practical, what shall be utilized in lieu of a pressure test?

A

Nondestructive examination.

132
Q

Substituting special procedures in place of a pressure test after an alteration or repair may be done onlyafter consultation with:

A

the inspector and the piping engineer

133
Q

Why is inspection of buried process piping (not regulated by DOT)different from other process pipinginspection?

A

Significant external deterioration can be caused by corrosive soil conditions.

134
Q

Corrosion cells can form on both bare and coated pipe where bare steel contacts the soil. How can thesecells be detected?

A

The potential at the area of corrosion will be measurable different than other areas and a close-intervalpotential survey can detect the location of corrosion.

135
Q

A pipe coating holiday survey is used to locate coating defects on coated pipes. It can be used on newlyconstructed pipe systems to ensure that the coating is intact and holiday-free. More often it is used onburied pipe to:

A

evaluate coating serviceability for buried piping that has been in-service for a long time

136
Q

Cathodically protected buried piping should be monitored __________ to assure adequate levels ofprotection.

A

regularly

137
Q

If an “intelligent pigging” system is used to inspect buried piping, what type of bends are usually required inthe piping system?

A

Five diameter bends.

138
Q

How often should above-grade visual surveillance of a buried pipeline right-of-way be made?

A

Approximately 6 month intervals.

139
Q

How often should poorly coated pipes with inconsistent cathodic protection potentials have a pipe-to-soilpotential survey made?

A

Every 5 years.

140
Q

On buried piping, what is the frequency of pipe coating holiday surveys?

A

It is usually based on indications that other forms of corrosion control are ineffective.

141
Q

For piping buried in lengths greater than ________ feet and not cathodically protected, evaluation of soilcorrosivity should be performed at 5-year intervals.

A

100

142
Q

If buried piping is cathodically protected, the system should be monitored at intervals in accordance withSection 10 of NACE RP0169 or Section 9 of API RP 651. API RP 651 specifies _________ interval.

A

annual

143
Q

Buried piping inspected periodically by excavation shall be inspected in lengths of ________ feet at one ormore locations judged to be most susceptible to corrosion.

A

6 to 8

144
Q

After excavation of buried piping, if inspection reveals damaged coating or corroded piping:

A

additional piping shall be excavated until the extent of the condition is identified.

145
Q

If buried piping is contained inside a casing pipe, the casing should be:

A

inspected to determine if water and/or soil has entered the casing

146
Q

An alternative or supplement to inspection of buried piping is leak testing with liquid at a pressure at least____ % greater than the maximum operating pressure at intervals 1/2 the length of those shown in Table9-1 of API 570 for piping not cathodically protected and at the same intervals as shown in Table 9-1 forcathodically protected piping.

A

10

147
Q

The leak test for buried piping should be for a period of ______ hours.

A

8

148
Q

The leak test for a 8” diameter buried piping system is 300 psi. After 7 hours, the pressure reads 273 psi.What should the inspector do?

A

The piping should be visually inspected externally and/or inspected internally to find the leak and assessthe extent of corrosion.

149
Q

A buried piping system that is not cathodically protected has to have an inspection interval set. The soilresistivity is checked and found to be 3400 ohm-cm. As the inspector, what interval of would you set?

A

10 years

150
Q

Buried piping also may be surveyed for integrity by removing the line from service and performing a leaktest. This inspection method typically involves pressurizing the line with a __________ , allowing time forthe ___________ to diffuse to the surface, and surveying the buried line with a gas-specific detector todetect the __________.

A

tracer gas (such as helium or sulfur hexafluoride)

151
Q

Repairs to coatings on buried piping may be tested using:

A

a high-voltage holiday detector

152
Q

If buried piping leaks are clamped and reburied,:

A

a record of the location and the date of installation shall be maintained

153
Q

A 10” diameter piping system with 4” diameter and 6” diameter reinforced branch connections is to havechanges made to it. Which of the following is considered an alteration?

A

A new 8” diameter reinforced branch connection is installed

154
Q

Which of the following qualifies as auxiliary piping ?

A

pump seal oil lines

155
Q

CUI stands for:

A

corrosion under insulation

156
Q

Deadlegs legs of a piping system are:

A

sections that normally have no significant flow

157
Q

A defect is an imperfection of a type or magnitude exceeding the ______ criteria.

A

acceptable

158
Q

The design temperature of a piping system component is the temperature at which, under the coincidentpressure, the ______________________________________ is required.

A

greatest thickness or highest component rating

159
Q

An examiner is a person who _________ the inspector

A

assists

160
Q

Hold point is a point in the repair or alteration process beyond which work may not proceed until the _______ _________ has been performed and documented

A

required inspection

161
Q

What is an imperfection?

A

It is a flaw or discontinuity noted during inspection that may be subject to acceptance

162
Q

_____________ : is a response or evidence resulting from the application of a nondestructive evaluation technique

A

indication

163
Q

What are points where chlorine is introduced in reformers, water is added in overhead systems, etc. called

A

injection points

164
Q

What is the loss of ductility and notch toughness in susceptible low-alloy steels such as 1.25 and 2.5 Cr.,due to prolonged exposure to high-temperature service called?

A

temper embrittlement

165
Q

Secondary process piping is small-bore (less than or equal to _______) process piping downstream ofnormally closed block valves

A

NPS 2

166
Q

A test point is an area defined by a circle having a diameter not greater than _____ inches for a linediameter not exceeding 10 inches or not greater than ______ inches for larger lines

A

2, 3

167
Q

When making a repair utilizing a welded full encirclement repair sleeve and the sleeve material isdifferent from the pipe material, you should

A

consult the piping engineer.

168
Q

What type of electrode should be used when welding a full encirclement repair sleeve?

A

low-hydrogen electrode

169
Q

Which of the following welding electrodes is low-hydrogen?

A

E7016

170
Q

. When welding a small repair patch, the diameter of electrodes used should not exceed:

A

5/32’’

api 570 re-do (4 decks)

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