INTERVIEW QUESTIONS
PIPING & ASME B 31.3
1. In piping when design consideration is needed as a miter?
Ans: An
angular offset of 3 deg or less does not require design consideration as a
miter bend.
[Clause
304.2.3; ASME B 31.3 Ed: 2004]
2. Can we use more than one gasket in a flange?
Ans: No
more than one gasket shall be used between contact faces in assembling a flange
joint
[Clause
335.2.4; ASME B 31.3 Ed:2004]
3. If a threaded joint is leaked during hydrostatic leak test can it be welded?
Ans: A
joint containing thread compound which leaks during leak testing may be seal
welded provided,
a) All compound uses in the threaded joint is
removed from exposed threads
[Clause 335.3.2; ASME B 31.3 Ed:2004]
b) Seal welds shall cover all exposed threads
[Clause 328.5.3; ASME B 31.3 Ed:2004]
c) Seal welding shall be done by a qualified welder
[Clause 328.5.3; ASME B 31.3 Ed:2004]
4. Is welder qualification required for welding Thermocouple (TC) using capacitor discharge method?
Ans:
No. WPS and PQR also not required. After removing the TC the areas shall be
visually examined for evidence of defects to be repaired. [Clause
330.1.3(b); ASME B 31.3 Ed:2004]
5. What are the methods that can be used for temperature verification of preheat in welding?
Ans: a)
Temperature indicating crayons
b) Thermocouple pyrometers
c) Thermocouple
[Clause 330.1.3(a) & (b) ; ASME B 31.3 Ed:2004]
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