Piping Basics of Piping 5

Question 1

What is the primary difference between a weld neck flange and a slip-on flange?

Accepted Answer

Weld neck flanges have a long tapered hub and use a full-penetration butt weld; slip-on flanges slide over the pipe and use fillet welds

Answer

Weld neck flanges are stronger and better suited for high-pressure or cyclic service due to their tapered hub and butt weld, while slip-on flanges are easier to align but have lower strength.

Question 2

What is the purpose of a spectacle blind (spade) in a piping system?

Accepted Answer

To provide positive isolation of a line section for maintenance or testing

Answer

A spectacle blind is a device inserted between flanges that provides positive, visible isolation of a piping section, ensuring that no fluid can pass during maintenance operations.

Question 3

In a piping isometric drawing, what does a '45° elbow' symbol indicate?

Accepted Answer

A pipe bend of 45 degrees changing the flow direction

Answer

A 45° elbow fitting changes the flow direction by 45 degrees and is shown on isometric drawings with a specific symbol to indicate both the fitting type and the direction change.

Question 4

Which type of gasket is typically used between raised-face flanges in high-pressure service?

Accepted Answer

Spiral-wound metallic gasket

Answer

Spiral-wound gaskets, made of alternating metal and filler material, are preferred for high-pressure raised-face flange connections because they provide excellent sealing under high bolt loads.

Question 5

What is the purpose of pipe insulation in process piping?

Accepted Answer

To conserve heat or cold, prevent condensation, and protect personnel

Answer

Pipe insulation serves multiple functions: it reduces heat loss or gain to improve energy efficiency, prevents condensation on cold lines, and protects workers from contact with hot or cold surfaces.

Piping Practice Test

Piping Practice Test

Piping Basics of Piping 5