Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on
which weld orientation?
ANSWER
longitudinal weld
In severe refinery services which type of pipe is normally used?
ANSWER
seamless
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service.
ANSWER
10%
for welded pipe, the normal thickness of under-tolerance is?
ANSWER
.010 or 10 mils
when qualifying a weld procedure the esential variables must:
ANSWER
be recorded on both the WPS & PQR
a pipe has a thickness designation of "40S". what does the "S" mean?
ANSWER
1
, stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above:
ANSWER
2 inches
According to ASME/ANSI B16.5 flanges from plate materials can only be used for:
ANSWER
Blind flanges
A propane piping system should be classified as?
ANSWER
Class 1
The corrosiveness of soils can be determined by measuring the soils:
ANSWER
Resistivity
Preheat should never be substituted for PWHT if:
ANSWER
The PWHT was designed to prevent environmental cracking
During welding, non-esential variables:
ANSWER
Must be recorded only on the WPS and must be followed by the welder.
ASME/ANSI B16.5 requires flanges to be:
2
which weld orientation?
ANSWER
longitudinal weld
In severe refinery services which type of pipe is normally used?
ANSWER
seamless
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service.
ANSWER
10%
for welded pipe, the normal thickness of under-tolerance is?
ANSWER
.010 or 10 mils
when qualifying a weld procedure the esential variables must:
ANSWER
be recorded on both the WPS & PQR
a pipe has a thickness designation of "40S". what does the "S" mean?
ANSWER
1
, stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above:
ANSWER
2 inches
According to ASME/ANSI B16.5 flanges from plate materials can only be used for:
ANSWER
Blind flanges
A propane piping system should be classified as?
ANSWER
Class 1
The corrosiveness of soils can be determined by measuring the soils:
ANSWER
Resistivity
Preheat should never be substituted for PWHT if:
ANSWER
The PWHT was designed to prevent environmental cracking
During welding, non-esential variables:
ANSWER
Must be recorded only on the WPS and must be followed by the welder.
ASME/ANSI B16.5 requires flanges to be:
2
