Certified Pipefitter Steam Traps and Steam Systems

Question 1

What is the primary function of a steam trap in a steam distribution system?

Accepted Answer

To discharge condensate and non-condensable gases while retaining live steam

Answer

To increase steam pressure before it enters process equipment

Answer

To reduce steam velocity in long distribution mains

Answer

To filter particulates from the steam supply

Question 2

Which type of steam trap uses a floating ball that rises with accumulating condensate to mechanically open a discharge valve, providing continuous condensate removal?

Accepted Answer

Float and thermostatic (F&T) trap

Answer

Inverted bucket trap

Answer

Thermodynamic disc trap

Answer

Balanced-pressure bellows trap

Question 3

What is 'water hammer' in a steam piping system?

Accepted Answer

The violent pressure shock wave generated when high-velocity steam contacts a slug of subcooled condensate

Answer

A routine vibration produced by high steam velocity in undersized pipe

Answer

The sound produced by a pressure relief valve opening

Answer

Normal condensation occurring inside insulated steam mains

Question 4

What distinguishes superheated steam from saturated steam at the same pressure?

Accepted Answer

Superheated steam has been heated above its saturation temperature and contains no liquid water

Answer

Superheated steam contains moisture droplets; saturated steam does not

Answer

Superheated steam is produced only in electric boilers, not fire-tube boilers

Answer

Superheated steam has a lower energy content than saturated steam at the same pressure

Question 5

Why should steam mains be pitched (sloped) in the direction of steam flow?

Accepted Answer

To allow condensate to drain by gravity to trap stations and prevent accumulation

Answer

To increase steam velocity and improve system efficiency

Answer

To reduce heat loss through the pipe walls

Answer

To comply with OSHA minimum slope requirements for pressurized piping

Question 6

What is 'flash steam,' and where does it occur in a steam system?

Accepted Answer

Steam generated when high-pressure, high-temperature condensate is discharged to a lower-pressure zone

Answer

Steam that passes through a failed-open steam trap at full line pressure

Answer

Steam that has been superheated in an attemperator to above 600°F

Answer

Steam produced by a safety relief valve discharge during an overpressure event