Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld orientation?
longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service?
10%
00:04
01:11
for welded pipe, the normal thickne...
pressure applied inside a pipe creates stress in the pipe wall these stresses are highest on which weld orientation
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Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld
orientation? - ANSWERlongitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? -
ANSWER10%
for welded pipe, the normal thickness of under-tolerance is? - ANSWER.010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils: - ANSWERResistivity
when qualifying a weld procedure the essential variables must: - ANSWERbe recorded on both the WPS
& PQR
In severe refinery services which type of pipe is normally used? - ANSWERseamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? - ANSWERStainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above: - ANSWER2 inches
A propane piping system should be classified as? - ANSWERClass 1
According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - ANSWERBlind flanges
,Preheat should never be substituted for PWHT if: - ANSWERthe PWHT was used to prevent
environmental cracking.
During welding, non-esential variables: - ANSWERMust be recorded only on the WPS and must be
followed by the welder.
During a hydrotest, all joints should be: - ANSWERleft uninsulated
ASME/ANSI B16.5 requires flanges to be: - ANSWERmarked with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: - ANSWER800°F
During pipe fabrication who has overall responsibility for compliance with the code? - ANSWERThe
owner/user
Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed?
- ANSWERThe owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - ANSWER3%
A welder becomes unqualified when he has not welded in: - ANSWER6 months
A PQR test coupon with a shell thickness of "T" can generally be used to qualify a wall thickness on the
WPS up to. - ANSWER2T
A pressure test is always required: - ANSWERwhenever the authorized inspector believes one is
necessary
, When can radiography not be used to qualify a welder? - ANSWERwhen using the GMAW process with
the short circuit mode
Generally, raised face flanges should have a surface finish of: - ANSWER125-250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity should be: - ANSWER100
footcandles
Describe the 3G welding test position. - ANSWERVertical groove Weld
Seal welding pipe threads: - ANSWERmay be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: - ANSWER120 %
When fabricating pipe, unknown materials: - ANSWERShould never be used (except for door stops)
The material verification program specified by API 578 covers: - ANSWERonly pressure containing
components.
what is the interval for thickness measurements on a class 1 piping system? - ANSWERlesser of 5 years
or half life of the pipe
According to B31.3, a welder's qualification records from a previous employer can: - ANSWERBe
accepted if the inspector approves
When welding together piping components of different thicknesses, the thicker part should be trimmed
with a: - ANSWER30 degree taper.
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