Piping Notes

09/04/2026

09/04/2026

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07/04/2026

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07/04/2026

What is NPS?
Ans: NPS stands for nominal pipe size that is used to describe a pipe name only.

05/04/2026

Name the methods of joining pipe?
Ans: There are three common methods of joining pipe.
Butt welded (BW)
Socket weld (SW)
Screwed or threaded

04/04/2026

Why a vent hole is made to reinforcement pad of branch connection?
Ans: To escape hot gas generated during welding and to reveal leakage in the weld between branch and header

28/03/2026

Hydro test pressure should be calculated as follow except as provided against point no-d.
1.5 Times of Design Pressure.
For a design temperature above the test temperature, minimum test pressure can be calculated as:
Pt = (1.5 X P X St) / S
Where: -
Pt: Minimum Test Pressure.
P: Internal design pressure.
St: Allowable stress at test temperature.
S: Allowable stress as design temperature.
If a test pressure as per above would produce a stress in excess of the yield strength at test temp. The test pressure may be reduced to maximum pressure that will not exceed the yield strength at test temp.
If the test pressure of piping exceeds the vessel pressure and it is not considered Practicable to isolate piping from vessel, the piping and vessel may be tested together at test pressure of the vessel when approved by owner and provided the test pressure For vessel is not less than 115% of piping design pressure adjusted for temperature as Per points no b.

06/01/2026

Q: What safety checks before bolt torquing?

05/01/2026

Q: What info from isometric drawings?

04/01/2026

Q: What are your main duties as a piping inspector?

04/01/2026

Q: What do you do if you see unsafe construction?